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/* |
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* Copyright (C) 2005-2006 Anders Gavare. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. The name of the author may not be used to endorse or promote products |
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* derived from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* |
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* $Id: pc_bios.c,v 1.7 2006/07/26 23:21:48 debug Exp $ |
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* |
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* Generic PC BIOS emulation. |
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* |
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* See http://hdebruijn.soo.dto.tudelft.nl/newpage/interupt/INT.HTM for |
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* details on what different BIOS interrupts do. |
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* |
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* |
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* The BIOS address space is used as follows: |
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* |
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* 0xf1000 GDT + PD + PTs used for booting in pmode |
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* 0xf8yy0 real mode interrupt handler (int 0xyy) |
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* 0xf9000 SMP tables |
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* 0xfefc7 disk table |
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* 0xff66e 8x8 font (chars 128..255) |
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* 0xffa6e 8x8 font (chars 0..127) |
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* 0xfffd0 System Configuration Parameters (8 bytes) |
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* 0xffff0 Reboot "code". |
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* |
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* TODO: Keep the "BIOS data area" in synch. (Such as keyboard shift state, |
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* disk access, video mode, error codes, x and y charcell resolution...) |
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*/ |
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|
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <time.h> |
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|
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#include "cpu.h" |
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#include "misc.h" |
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|
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#ifndef ENABLE_X86 |
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|
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/* Don't include PC bios support if we don't have x86 cpu support. */ |
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/* These are just do-nothing functions. */ |
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|
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void pc_bios_simple_pmode_setup(struct cpu *cpu) { } |
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void pc_bios_init(struct cpu *cpu) { } |
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int pc_bios_emul(struct cpu *cpu) { return 0; } |
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|
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|
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#else |
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|
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|
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#include "console.h" |
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#include "cpu_x86.h" |
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#include "devices.h" |
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#include "diskimage.h" |
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#include "machine.h" |
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#include "memory.h" |
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|
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|
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extern int quiet_mode; |
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|
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extern unsigned char font8x8[]; |
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|
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#define dec_to_bcd(x) ( (((x) / 10) << 4) + ((x) % 10) ) |
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|
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|
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/* |
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* add_disk(): |
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*/ |
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static struct pc_bios_disk *add_disk(struct machine *machine, int biosnr, |
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int id, int type) |
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{ |
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struct pc_bios_disk *p = malloc(sizeof(struct pc_bios_disk)); |
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|
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if (p == NULL) { |
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fprintf(stderr, "add_disk(): out of memory\n"); |
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exit(1); |
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} |
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|
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p->next = machine->md.pc.first_disk; |
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machine->md.pc.first_disk = p; |
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|
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p->nr = biosnr; p->id = id; p->type = type; |
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|
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p->size = diskimage_getsize(machine, id, type); |
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diskimage_getchs(machine, id, type, &p->cylinders, &p->heads, |
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&p->sectorspertrack); |
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|
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return p; |
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} |
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|
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|
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static struct pc_bios_disk *get_disk(struct machine *machine, int biosnr) |
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{ |
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struct pc_bios_disk *p = machine->md.pc.first_disk; |
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while (p != NULL) { |
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if (p->nr == biosnr) |
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break; |
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p = p->next; |
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} |
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return p; |
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} |
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|
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|
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/* |
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* output_char(): |
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*/ |
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static void output_char(struct cpu *cpu, int x, int y, int ch, int color) |
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{ |
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uint64_t addr = (y * cpu->machine->md.pc.columns + x) * 2 + 0xb8000; |
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unsigned char w[2]; |
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int len = 2; |
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|
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w[0] = ch; w[1] = color; |
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if (color < 0) |
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len = 1; |
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|
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cpu->memory_rw(cpu, cpu->mem, addr, &w[0], len, MEM_WRITE, |
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CACHE_NONE | PHYSICAL); |
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} |
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|
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|
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/* |
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* cmos_write(): |
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*/ |
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static void cmos_write(struct cpu *cpu, int addr, int value) |
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{ |
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unsigned char c; |
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c = addr; |
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cpu->memory_rw(cpu, cpu->mem, X86_IO_BASE + 0x70, &c, 1, MEM_WRITE, |
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CACHE_NONE | PHYSICAL); |
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c = value; |
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cpu->memory_rw(cpu, cpu->mem, X86_IO_BASE + 0x71, &c, 1, MEM_WRITE, |
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CACHE_NONE | PHYSICAL); |
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} |
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|
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|
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/* |
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* set_cursor_pos(): |
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*/ |
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static void set_cursor_pos(struct cpu *cpu, int x, int y) |
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{ |
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int addr = y * cpu->machine->md.pc.columns + x; |
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unsigned char byte; |
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uint64_t ctrlregs = X86_IO_BASE + 0x3c0; |
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|
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byte = 0x0e; |
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cpu->memory_rw(cpu, cpu->mem, ctrlregs + 0x14, |
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&byte, sizeof(byte), MEM_WRITE, CACHE_NONE | PHYSICAL); |
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byte = (addr >> 8) & 255; |
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cpu->memory_rw(cpu, cpu->mem, ctrlregs + 0x15, |
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&byte, sizeof(byte), MEM_WRITE, CACHE_NONE | PHYSICAL); |
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byte = 0x0f; |
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cpu->memory_rw(cpu, cpu->mem, ctrlregs + 0x14, |
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&byte, sizeof(byte), MEM_WRITE, CACHE_NONE | PHYSICAL); |
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byte = addr & 255; |
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cpu->memory_rw(cpu, cpu->mem, ctrlregs + 0x15, |
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&byte, sizeof(byte), MEM_WRITE, CACHE_NONE | PHYSICAL); |
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} |
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|
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|
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/* |
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* set_cursor_scanlines(): |
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*/ |
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static void set_cursor_scanlines(struct cpu *cpu, int start, int end) |
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{ |
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unsigned char byte; |
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uint64_t ctrlregs = X86_IO_BASE + 0x3c0; |
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|
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byte = 0x0a; |
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cpu->memory_rw(cpu, cpu->mem, ctrlregs + 0x14, |
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&byte, sizeof(byte), MEM_WRITE, CACHE_NONE | PHYSICAL); |
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byte = start; |
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cpu->memory_rw(cpu, cpu->mem, ctrlregs + 0x15, |
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&byte, sizeof(byte), MEM_WRITE, CACHE_NONE | PHYSICAL); |
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byte = 0x0b; |
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cpu->memory_rw(cpu, cpu->mem, ctrlregs + 0x14, |
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&byte, sizeof(byte), MEM_WRITE, CACHE_NONE | PHYSICAL); |
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byte = end; |
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cpu->memory_rw(cpu, cpu->mem, ctrlregs + 0x15, |
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&byte, sizeof(byte), MEM_WRITE, CACHE_NONE | PHYSICAL); |
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} |
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|
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|
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/* |
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* get_cursor_pos(): |
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*/ |
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static void get_cursor_pos(struct cpu *cpu, int *x, int *y) |
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{ |
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int addr; |
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unsigned char byte; |
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uint64_t ctrlregs = X86_IO_BASE + 0x3c0; |
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|
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byte = 0x0e; |
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cpu->memory_rw(cpu, cpu->mem, ctrlregs + 0x14, |
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&byte, sizeof(byte), MEM_WRITE, CACHE_NONE | PHYSICAL); |
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cpu->memory_rw(cpu, cpu->mem, ctrlregs + 0x15, |
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&byte, sizeof(byte), MEM_READ, CACHE_NONE | PHYSICAL); |
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addr = byte; |
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|
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byte = 0x0f; |
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cpu->memory_rw(cpu, cpu->mem, ctrlregs + 0x14, |
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&byte, sizeof(byte), MEM_WRITE, CACHE_NONE | PHYSICAL); |
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cpu->memory_rw(cpu, cpu->mem, ctrlregs + 0x15, |
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&byte, sizeof(byte), MEM_READ, CACHE_NONE | PHYSICAL); |
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addr = addr*256 + byte; |
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|
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*x = addr % cpu->machine->md.pc.columns; |
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*y = addr / cpu->machine->md.pc.columns; |
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} |
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|
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|
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/* |
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* set_palette(): |
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*/ |
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static void set_palette(struct cpu *cpu, int n, int r, int g, int b) |
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{ |
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unsigned char byte = n; |
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cpu->memory_rw(cpu, cpu->mem, X86_IO_BASE + 0x3c8, |
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&byte, sizeof(byte), MEM_WRITE, CACHE_NONE | PHYSICAL); |
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byte = r; |
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cpu->memory_rw(cpu, cpu->mem, X86_IO_BASE + 0x3c9, |
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&byte, sizeof(byte), MEM_WRITE, CACHE_NONE | PHYSICAL); |
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byte = g; |
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cpu->memory_rw(cpu, cpu->mem, X86_IO_BASE + 0x3c9, |
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&byte, sizeof(byte), MEM_WRITE, CACHE_NONE | PHYSICAL); |
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byte = b; |
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cpu->memory_rw(cpu, cpu->mem, X86_IO_BASE + 0x3c9, |
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&byte, sizeof(byte), MEM_WRITE, CACHE_NONE | PHYSICAL); |
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} |
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|
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|
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/* |
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* get_palette(): |
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*/ |
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static void get_palette(struct cpu *cpu, int n, unsigned char *rgb) |
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{ |
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unsigned char byte = n; |
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cpu->memory_rw(cpu, cpu->mem, X86_IO_BASE + 0x3c8, |
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&byte, sizeof(byte), MEM_WRITE, CACHE_NONE | PHYSICAL); |
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cpu->memory_rw(cpu, cpu->mem, X86_IO_BASE + 0x3c9, |
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&rgb[0], 1, MEM_READ, CACHE_NONE | PHYSICAL); |
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cpu->memory_rw(cpu, cpu->mem, X86_IO_BASE + 0x3c9, |
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&rgb[1], 1, MEM_READ, CACHE_NONE | PHYSICAL); |
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cpu->memory_rw(cpu, cpu->mem, X86_IO_BASE + 0x3c9, |
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&rgb[2], 1, MEM_READ, CACHE_NONE | PHYSICAL); |
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} |
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|
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|
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/* |
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* scroll_up(): |
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*/ |
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static void scroll_up(struct cpu *cpu, int x1, int y1, int x2, int y2, int attr) |
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{ |
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int x, y; |
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|
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if (x1 < 0) x1 = 0; |
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if (y1 < 0) y1 = 0; |
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if (x2 >= cpu->machine->md.pc.columns) |
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x2 = cpu->machine->md.pc.columns - 1; |
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if (y2 >= cpu->machine->md.pc.rows) |
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y2 = cpu->machine->md.pc.rows - 1; |
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|
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/* Scroll up by copying lines: */ |
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for (y=y1; y<=y2-1; y++) { |
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int addr = (cpu->machine->md.pc.columns*y + x1) * 2 + 0xb8000; |
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int len = (x2-x1+1) * 2; |
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unsigned char w[160]; |
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addr += (cpu->machine->md.pc.columns * 2); |
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cpu->memory_rw(cpu, cpu->mem, addr, &w[0], len, |
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MEM_READ, CACHE_NONE | PHYSICAL); |
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addr -= (cpu->machine->md.pc.columns * 2); |
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cpu->memory_rw(cpu, cpu->mem, addr, &w[0], len, |
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MEM_WRITE, CACHE_NONE | PHYSICAL); |
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} |
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|
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/* Clear lowest line: */ |
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for (x=x1; x<=x2; x++) |
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output_char(cpu, x, y2, ' ', attr); |
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} |
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|
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|
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/* |
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* scroll_down(): |
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*/ |
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static void scroll_down(struct cpu *cpu, int x1, int y1, int x2, int y2, |
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int attr) |
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{ |
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int x, y; |
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|
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if (x1 < 0) x1 = 0; |
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if (y1 < 0) y1 = 0; |
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if (x2 >= cpu->machine->md.pc.columns) |
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x2 = cpu->machine->md.pc.columns - 1; |
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if (y2 >= cpu->machine->md.pc.rows) |
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y2 = cpu->machine->md.pc.rows - 1; |
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|
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/* Scroll down by copying lines: */ |
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for (y=y2; y>=y1+1; y--) { |
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int addr = (cpu->machine->md.pc.columns*y + x1) * 2 + 0xb8000; |
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int len = (x2-x1+1) * 2; |
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unsigned char w[160]; |
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addr -= cpu->machine->md.pc.columns * 2; |
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cpu->memory_rw(cpu, cpu->mem, addr, &w[0], len, |
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MEM_READ, CACHE_NONE | PHYSICAL); |
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addr += cpu->machine->md.pc.columns * 2; |
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cpu->memory_rw(cpu, cpu->mem, addr, &w[0], len, |
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MEM_WRITE, CACHE_NONE | PHYSICAL); |
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} |
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|
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/* Clear the uppermost line: */ |
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for (x=x1; x<=x2; x++) |
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output_char(cpu, x, y1, ' ', attr); |
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} |
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|
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|
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/* |
| 338 |
* pc_bios_putchar(): |
| 339 |
*/ |
| 340 |
static void pc_bios_putchar(struct cpu *cpu, char ch, int attr, |
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int linewrap_and_scroll) |
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{ |
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int x, y; |
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|
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get_cursor_pos(cpu, &x, &y); |
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|
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if (!linewrap_and_scroll) { |
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if (x < cpu->machine->md.pc.columns && |
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y < cpu->machine->md.pc.rows) { |
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output_char(cpu, x, y, ch, attr); |
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x++; |
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set_cursor_pos(cpu, x, y); |
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} |
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return; |
| 355 |
} |
| 356 |
|
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/* Put the character on the screen, move cursor, and so on: */ |
| 358 |
switch (ch) { |
| 359 |
case '\r': x = -1; break; |
| 360 |
case '\n': x = cpu->machine->md.pc.columns; break; |
| 361 |
case '\b': x -= 2; break; |
| 362 |
default: output_char(cpu, x, y, ch, attr); |
| 363 |
} |
| 364 |
x++; |
| 365 |
if (x < 0) |
| 366 |
x = 0; |
| 367 |
if (x >= cpu->machine->md.pc.columns) { |
| 368 |
x=0; y++; |
| 369 |
} |
| 370 |
|
| 371 |
if (attr < 0) |
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attr = cpu->machine->md.pc.curcolor; |
| 373 |
|
| 374 |
if (y >= cpu->machine->md.pc.rows) { |
| 375 |
scroll_up(cpu, 0,0, cpu->machine->md.pc.columns-1, |
| 376 |
cpu->machine->md.pc.rows-1, attr); |
| 377 |
x = 0; y = cpu->machine->md.pc.rows - 1; |
| 378 |
} |
| 379 |
set_cursor_pos(cpu, x, y); |
| 380 |
} |
| 381 |
|
| 382 |
|
| 383 |
/* |
| 384 |
* pc_bios_printstr(): |
| 385 |
*/ |
| 386 |
static void pc_bios_printstr(struct cpu *cpu, char *s, int attr) |
| 387 |
{ |
| 388 |
while (*s) |
| 389 |
pc_bios_putchar(cpu, *s++, attr, 1); |
| 390 |
} |
| 391 |
|
| 392 |
|
| 393 |
/* |
| 394 |
* set_video_mode(): |
| 395 |
*/ |
| 396 |
static void set_video_mode(struct cpu *cpu, int al) |
| 397 |
{ |
| 398 |
uint64_t ctrlregs = X86_IO_BASE + 0x3c0; |
| 399 |
int x, y, text; |
| 400 |
unsigned char byte = 0xff; |
| 401 |
|
| 402 |
cpu->memory_rw(cpu, cpu->mem, ctrlregs + 0x14, &byte, sizeof(byte), |
| 403 |
MEM_WRITE, CACHE_NONE | PHYSICAL); |
| 404 |
byte = al; |
| 405 |
cpu->memory_rw(cpu, cpu->mem, ctrlregs + 0x15, &byte, sizeof(byte), |
| 406 |
MEM_WRITE, CACHE_NONE | PHYSICAL); |
| 407 |
|
| 408 |
text = 0; |
| 409 |
|
| 410 |
switch (al) { |
| 411 |
case 0x00: /* 40x25 non-color textmode */ |
| 412 |
case 0x01: /* 40x25 color textmode */ |
| 413 |
cpu->machine->md.pc.columns = 40; |
| 414 |
cpu->machine->md.pc.rows = 25; |
| 415 |
text = 1; |
| 416 |
break; |
| 417 |
case 0x02: /* 80x25 non-color textmode */ |
| 418 |
case 0x03: /* 80x25 color textmode */ |
| 419 |
cpu->machine->md.pc.columns = 80; |
| 420 |
cpu->machine->md.pc.rows = 25; |
| 421 |
text = 1; |
| 422 |
break; |
| 423 |
case 0x19: /* ? */ |
| 424 |
break; |
| 425 |
case 0x0d: /* 320x200 x 16 colors graphics */ |
| 426 |
set_cursor_scanlines(cpu, 0x40, 0); |
| 427 |
break; |
| 428 |
case 0x12: /* 640x480 x 16 colors graphics */ |
| 429 |
set_cursor_scanlines(cpu, 0x40, 0); |
| 430 |
break; |
| 431 |
case 0x13: /* 320x200 x 256 colors graphics */ |
| 432 |
set_cursor_scanlines(cpu, 0x40, 0); |
| 433 |
break; |
| 434 |
default: |
| 435 |
fatal("[ set_video_mode(): unimplemented video mode " |
| 436 |
"0x%02x ]\n", al); |
| 437 |
cpu->running = 0; |
| 438 |
} |
| 439 |
|
| 440 |
cpu->machine->md.pc.curcolor = 0x07; |
| 441 |
cpu->machine->md.pc.videomode = al; |
| 442 |
|
| 443 |
if (text) { |
| 444 |
/* Simply clear the screen and home the cursor |
| 445 |
for now. TODO: More advanced stuff. */ |
| 446 |
set_cursor_pos(cpu, 0, 0); |
| 447 |
for (y=0; y<cpu->machine->md.pc.rows; y++) |
| 448 |
for (x=0; x<cpu->machine->md.pc.columns; x++) |
| 449 |
output_char(cpu, x,y, ' ', |
| 450 |
cpu->machine->md.pc.curcolor); |
| 451 |
} |
| 452 |
} |
| 453 |
|
| 454 |
|
| 455 |
/* |
| 456 |
* pc_bios_int8(): |
| 457 |
* |
| 458 |
* Interrupt handler for the timer. |
| 459 |
*/ |
| 460 |
static int pc_bios_int8(struct cpu *cpu) |
| 461 |
{ |
| 462 |
unsigned char ticks[4]; |
| 463 |
unsigned char tmpbyte; |
| 464 |
|
| 465 |
/* TODO: ack the timer interrupt some other way? */ |
| 466 |
cpu->memory_rw(cpu, cpu->mem, X86_IO_BASE + 0x43, |
| 467 |
&tmpbyte, 1, MEM_READ, CACHE_NONE | PHYSICAL); |
| 468 |
|
| 469 |
/* EOI the interrupt. */ |
| 470 |
cpu->machine->isa_pic_data.pic1->isr &= ~0x01; |
| 471 |
|
| 472 |
/* "Call" INT 0x1C: */ |
| 473 |
/* TODO: how about non-real-mode? */ |
| 474 |
cpu->memory_rw(cpu, cpu->mem, 0x1C * 4, |
| 475 |
ticks, 4, MEM_READ, CACHE_NONE | PHYSICAL); |
| 476 |
cpu->pc = ticks[0] + (ticks[1] << 8); |
| 477 |
reload_segment_descriptor(cpu, X86_S_CS, ticks[2] + (ticks[3] << 8), |
| 478 |
NULL); |
| 479 |
return 0; |
| 480 |
} |
| 481 |
|
| 482 |
|
| 483 |
/* |
| 484 |
* pc_bios_int9(): |
| 485 |
* |
| 486 |
* Interrupt handler for the keyboard. |
| 487 |
*/ |
| 488 |
static void pc_bios_int9(struct cpu *cpu) |
| 489 |
{ |
| 490 |
uint8_t byte; |
| 491 |
|
| 492 |
/* Read a key from the keyboard: */ |
| 493 |
cpu->memory_rw(cpu, cpu->mem, X86_IO_BASE + 0x60, |
| 494 |
&byte, sizeof(byte), MEM_READ, CACHE_NONE | PHYSICAL); |
| 495 |
|
| 496 |
/* (The read should have acknowdledged the interrupt.) */ |
| 497 |
|
| 498 |
/* Add the key to the keyboard buffer: */ |
| 499 |
cpu->machine->md.pc.kbd_buf_scancode[ |
| 500 |
cpu->machine->md.pc.kbd_buf_tail] = byte; |
| 501 |
|
| 502 |
/* TODO: The shift state should be located in the BIOS |
| 503 |
data area. */ |
| 504 |
|
| 505 |
if (byte == 0x2a) { |
| 506 |
cpu->machine->md.pc.shift_state |= PC_KBD_SHIFT; |
| 507 |
byte = 0; |
| 508 |
} |
| 509 |
if (byte == 0x1d) { |
| 510 |
cpu->machine->md.pc.shift_state |= PC_KBD_CTRL; |
| 511 |
byte = 0; |
| 512 |
} |
| 513 |
if (byte == 0x2a + 0x80) { |
| 514 |
cpu->machine->md.pc.shift_state &= ~PC_KBD_SHIFT; |
| 515 |
byte = 0; |
| 516 |
} |
| 517 |
if (byte == 0x1d + 0x80) { |
| 518 |
cpu->machine->md.pc.shift_state &= ~PC_KBD_CTRL; |
| 519 |
byte = 0; |
| 520 |
} |
| 521 |
|
| 522 |
/* Convert scancode into ASCII: */ |
| 523 |
/* (TODO: Maybe this should be somewhere else?) */ |
| 524 |
switch (cpu->machine->md.pc.shift_state) { |
| 525 |
case 0: if (byte >= 1 && byte <= 0xf) |
| 526 |
byte = "\0331234567890-=\b\t"[byte-1]; |
| 527 |
else if (byte >= 0x10 && byte <= 0x1b) |
| 528 |
byte = "qwertyuiop[]"[byte-0x10]; |
| 529 |
else if (byte >= 0x1c && byte <= 0x2b) |
| 530 |
byte = "\r\000asdfghjkl;'`\000\\"[byte-0x1c]; |
| 531 |
else if (byte >= 0x2c && byte <= 0x35) |
| 532 |
byte = "zxcvbnm,./"[byte-0x2c]; |
| 533 |
else if (byte >= 0x37 && byte <= 0x39) |
| 534 |
byte = "*\000 "[byte-0x37]; |
| 535 |
else |
| 536 |
byte = 0; |
| 537 |
break; |
| 538 |
case PC_KBD_SHIFT: |
| 539 |
if (byte >= 1 && byte <= 0xf) |
| 540 |
byte = "\033!@#$%^&*()_+\b\t"[byte-1]; |
| 541 |
else if (byte >= 0x10 && byte <= 0x1b) |
| 542 |
byte = "QWERTYUIOP{}"[byte-0x10]; |
| 543 |
else if (byte >= 0x1c && byte <= 0x2b) |
| 544 |
byte = "\r\000ASDFGHJKL:\"~\000|"[byte-0x1c]; |
| 545 |
else if (byte >= 0x2c && byte <= 0x35) |
| 546 |
byte = "ZXCVBNM<>?"[byte-0x2c]; |
| 547 |
else if (byte >= 0x37 && byte <= 0x39) |
| 548 |
byte = "*\000 "[byte-0x37]; |
| 549 |
else |
| 550 |
byte = 0; |
| 551 |
break; |
| 552 |
default: |
| 553 |
byte = 0; |
| 554 |
} |
| 555 |
|
| 556 |
cpu->machine->md.pc.kbd_buf[cpu->machine->md.pc.kbd_buf_tail] = byte; |
| 557 |
|
| 558 |
cpu->machine->md.pc.kbd_buf_tail ++; |
| 559 |
cpu->machine->md.pc.kbd_buf_tail %= PC_BIOS_KBD_BUF_SIZE; |
| 560 |
|
| 561 |
/* EOI the interrupt. */ |
| 562 |
cpu->machine->isa_pic_data.pic1->isr &= ~0x02; |
| 563 |
} |
| 564 |
|
| 565 |
|
| 566 |
/* |
| 567 |
* pc_bios_int10(): |
| 568 |
* |
| 569 |
* Video functions. |
| 570 |
*/ |
| 571 |
static void pc_bios_int10(struct cpu *cpu) |
| 572 |
{ |
| 573 |
uint64_t ctrlregs = X86_IO_BASE + 0x3c0; |
| 574 |
unsigned char byte; |
| 575 |
unsigned char rgb[3]; |
| 576 |
int x,y, oldx,oldy; |
| 577 |
int ah = (cpu->cd.x86.r[X86_R_AX] >> 8) & 0xff; |
| 578 |
int al = cpu->cd.x86.r[X86_R_AX] & 0xff; |
| 579 |
int dh = (cpu->cd.x86.r[X86_R_DX] >> 8) & 0xff; |
| 580 |
int dl = cpu->cd.x86.r[X86_R_DX] & 0xff; |
| 581 |
int ch = (cpu->cd.x86.r[X86_R_CX] >> 8) & 0xff; |
| 582 |
int cl = cpu->cd.x86.r[X86_R_CX] & 0xff; |
| 583 |
int bh = (cpu->cd.x86.r[X86_R_BX] >> 8) & 0xff; |
| 584 |
int bl = cpu->cd.x86.r[X86_R_BX] & 0xff; |
| 585 |
int cx = cpu->cd.x86.r[X86_R_CX] & 0xffff; |
| 586 |
int dx = cpu->cd.x86.r[X86_R_DX] & 0xffff; |
| 587 |
int bp = cpu->cd.x86.r[X86_R_BP] & 0xffff; |
| 588 |
|
| 589 |
switch (ah) { |
| 590 |
case 0x00: /* Switch video mode. */ |
| 591 |
set_video_mode(cpu, al); |
| 592 |
break; |
| 593 |
case 0x01: |
| 594 |
/* ch = starting line, cl = ending line */ |
| 595 |
/* TODO: it seems that FreeDOS uses start=6 end=7. hm */ |
| 596 |
if (ch == 6 && cl == 7) |
| 597 |
ch = 12, cl = 14; |
| 598 |
set_cursor_scanlines(cpu, ch, cl); |
| 599 |
break; |
| 600 |
case 0x02: /* set cursor position */ |
| 601 |
set_cursor_pos(cpu, dl, dh); |
| 602 |
break; |
| 603 |
case 0x03: /* read cursor position */ |
| 604 |
get_cursor_pos(cpu, &x, &y); |
| 605 |
cpu->cd.x86.r[X86_R_DX] = (y << 8) + x; |
| 606 |
/* ch/cl = cursor start end... TODO */ |
| 607 |
cpu->cd.x86.r[X86_R_CX] = 0x000f; |
| 608 |
break; |
| 609 |
case 0x05: /* set active display page */ |
| 610 |
if (al != 0) |
| 611 |
fatal("WARNING: int 0x10, func 0x05, al = 0x%02\n", al); |
| 612 |
break; |
| 613 |
case 0x06: |
| 614 |
if (al < 1) |
| 615 |
al = 25; |
| 616 |
while (al-- > 0) |
| 617 |
scroll_up(cpu, cl, ch, dl, dh, bh); |
| 618 |
break; |
| 619 |
case 0x07: |
| 620 |
if (al < 1) |
| 621 |
al = 25; |
| 622 |
while (al-- > 0) |
| 623 |
scroll_down(cpu, cl, ch, dl, dh, bh); |
| 624 |
break; |
| 625 |
case 0x08: /* read char and attr at cur position */ |
| 626 |
/* TODO: return AH=attr, AL=char */ |
| 627 |
break; |
| 628 |
case 0x09: /* write character and attribute(todo) */ |
| 629 |
case 0x0a: /* write character only */ |
| 630 |
get_cursor_pos(cpu, &oldx, &oldy); |
| 631 |
while (cx-- > 0) |
| 632 |
pc_bios_putchar(cpu, al, ah==9? bl : -1, 0); |
| 633 |
if (ah == 9) |
| 634 |
cpu->machine->md.pc.curcolor = bl; |
| 635 |
set_cursor_pos(cpu, oldx, oldy); |
| 636 |
break; |
| 637 |
case 0x0b: /* set background palette */ |
| 638 |
fatal("WARNING: int 0x10, func 0x0b: TODO\n"); |
| 639 |
/* cpu->running = 0; */ |
| 640 |
break; |
| 641 |
case 0x0e: /* tty output */ |
| 642 |
pc_bios_putchar(cpu, al, -1, 1); |
| 643 |
break; |
| 644 |
case 0x0f: /* get video mode */ |
| 645 |
cpu->cd.x86.r[X86_R_AX] = cpu->machine->md.pc.columns << 8; |
| 646 |
|
| 647 |
byte = 0xff; |
| 648 |
cpu->memory_rw(cpu, cpu->mem, ctrlregs + 0x14, |
| 649 |
&byte, sizeof(byte), MEM_WRITE, CACHE_NONE | PHYSICAL); |
| 650 |
cpu->memory_rw(cpu, cpu->mem, ctrlregs + 0x15, |
| 651 |
&byte, sizeof(byte), MEM_READ, CACHE_NONE | PHYSICAL); |
| 652 |
cpu->cd.x86.r[X86_R_AX] |= byte; |
| 653 |
|
| 654 |
cpu->cd.x86.r[X86_R_BX] &= ~0xff00; /* BH = pagenr */ |
| 655 |
break; |
| 656 |
case 0x10: /* Palette stuff */ |
| 657 |
switch (al) { |
| 658 |
case 0x00: |
| 659 |
/* Hm. Is this correct? How about the upper 4 |
| 660 |
bits of bh? TODO */ |
| 661 |
set_palette(cpu, bl, |
| 662 |
((bh >> 2) & 1) * 0xaa + (bh&8? 0x55 : 0), |
| 663 |
((bh >> 1) & 1) * 0xaa + (bh&8? 0x55 : 0), |
| 664 |
((bh >> 0) & 1) * 0xaa + (bh&8? 0x55 : 0)); |
| 665 |
break; |
| 666 |
case 0x01: /* TODO: Set border color. */ |
| 667 |
fatal("TODO int 10,ah=10,al=01\n"); |
| 668 |
break; |
| 669 |
case 0x02: /* Set all palette registers. */ |
| 670 |
/* Load from ES:DX */ |
| 671 |
fatal("TODO: int10,10,02\n"); |
| 672 |
break; |
| 673 |
case 0x03: /* TODO: intensity/blinking bit */ |
| 674 |
debug("TODO int 10,ah=10,al=03\n"); |
| 675 |
break; |
| 676 |
case 0x10: |
| 677 |
set_palette(cpu, bl, dh, cl, ch); |
| 678 |
break; |
| 679 |
case 0x12: /* Set block of palette registers. */ |
| 680 |
/* Load from ES:DX, BX=start color, CX = |
| 681 |
nr of registers to load */ |
| 682 |
while (cx-- > 0) { |
| 683 |
cpu->cd.x86.cursegment = X86_S_ES; |
| 684 |
cpu->memory_rw(cpu, cpu->mem, dx, rgb, 3, |
| 685 |
MEM_READ, CACHE_DATA | NO_EXCEPTIONS); |
| 686 |
set_palette(cpu, bl, rgb[0],rgb[1],rgb[2]); |
| 687 |
dx += 3; |
| 688 |
bl ++; |
| 689 |
} |
| 690 |
break; |
| 691 |
case 0x17: /* Read block of palette registers. */ |
| 692 |
/* Load into ES:DX, BX=start color, CX = |
| 693 |
nr of registers to load */ |
| 694 |
while (cx-- > 0) { |
| 695 |
get_palette(cpu, bl, rgb); |
| 696 |
cpu->cd.x86.cursegment = X86_S_ES; |
| 697 |
cpu->memory_rw(cpu, cpu->mem, dx, rgb, 3, |
| 698 |
MEM_WRITE, CACHE_DATA | NO_EXCEPTIONS); |
| 699 |
dx += 3; |
| 700 |
bl ++; |
| 701 |
} |
| 702 |
break; |
| 703 |
case 0x1a: /* Get DAC State: TODO */ |
| 704 |
cpu->cd.x86.r[X86_R_BX] &= ~0xff; |
| 705 |
break; |
| 706 |
default:fatal("Unimplemented INT 0x10,AH=0x10,AL=0x%02x\n", al); |
| 707 |
cpu->running = 0; |
| 708 |
} |
| 709 |
break; |
| 710 |
case 0x11: /* Character generator */ |
| 711 |
/* TODO */ |
| 712 |
switch (al) { |
| 713 |
case 0x12: |
| 714 |
break; |
| 715 |
case 0x14: |
| 716 |
break; |
| 717 |
case 0x30: |
| 718 |
switch (bh) { |
| 719 |
case 0x03: /* 8x8 font */ |
| 720 |
cpu->cd.x86.r[X86_R_BP] &= ~0xffff; |
| 721 |
cpu->cd.x86.r[X86_R_BP] |= 0xfa6e; |
| 722 |
reload_segment_descriptor(cpu, X86_S_ES, |
| 723 |
0xf000, NULL); |
| 724 |
/* TODO: cx and dl, better values? */ |
| 725 |
cpu->cd.x86.r[X86_R_CX] &= ~0xffff; |
| 726 |
cpu->cd.x86.r[X86_R_CX] |= 16; |
| 727 |
cpu->cd.x86.r[X86_R_DX] &= ~0xff; |
| 728 |
cpu->cd.x86.r[X86_R_DX] |= 24; |
| 729 |
break; |
| 730 |
default: |
| 731 |
fatal("[ pc_bios: Get Font: TODO ]\n"); |
| 732 |
} |
| 733 |
break; |
| 734 |
default:fatal("Unimplemented INT 0x10,AH=0x11,AL=0x%02x\n", al); |
| 735 |
cpu->running = 0; |
| 736 |
} |
| 737 |
break; |
| 738 |
case 0x12: /* Video Subsystem Configuration */ |
| 739 |
/* TODO */ |
| 740 |
switch (bl) { |
| 741 |
case 0x10: |
| 742 |
cpu->cd.x86.r[X86_R_BX] &= ~0xffff; |
| 743 |
cpu->cd.x86.r[X86_R_BX] |= 0x0003; |
| 744 |
break; |
| 745 |
case 0x30: /* select nr of scanlines (200 + 50*al) */ |
| 746 |
debug("[ pc_bios: %i scanlines ]\n", 200+50*al); |
| 747 |
cpu->cd.x86.r[X86_R_AX] &= ~0xff; |
| 748 |
cpu->cd.x86.r[X86_R_AX] |= 0x12; |
| 749 |
break; |
| 750 |
case 0x34: /* TODO */ |
| 751 |
break; |
| 752 |
default:fatal("Unimplemented INT 0x10,AH=0x12,BL=0x%02x\n", bl); |
| 753 |
cpu->running = 0; |
| 754 |
} |
| 755 |
break; |
| 756 |
case 0x13: /* write string */ |
| 757 |
/* TODO: other flags in al */ |
| 758 |
get_cursor_pos(cpu, &oldx, &oldy); |
| 759 |
set_cursor_pos(cpu, dl, dh); |
| 760 |
while (cx-- > 0) { |
| 761 |
int len = 1; |
| 762 |
unsigned char byte[2]; |
| 763 |
byte[1] = 0x07; |
| 764 |
if (al & 2) |
| 765 |
len = 2; |
| 766 |
cpu->cd.x86.cursegment = X86_S_ES; |
| 767 |
cpu->memory_rw(cpu, cpu->mem, bp, &byte[0], len, |
| 768 |
MEM_READ, CACHE_DATA | NO_EXCEPTIONS); |
| 769 |
bp += len; |
| 770 |
pc_bios_putchar(cpu, byte[0], byte[1], 1); |
| 771 |
cpu->machine->md.pc.curcolor = byte[1]; |
| 772 |
} |
| 773 |
if (!(al & 1)) |
| 774 |
set_cursor_pos(cpu, oldx, oldy); |
| 775 |
break; |
| 776 |
case 0x1a: /* get/set video display combination */ |
| 777 |
if (al != 0) { |
| 778 |
fatal("FATAL: Unimplemented BIOS int 0x10 function" |
| 779 |
" 0x%02x, al=0x%02\n", ah, al); |
| 780 |
cpu->running = 0; |
| 781 |
} |
| 782 |
cpu->cd.x86.r[X86_R_AX] &= ~0xff; |
| 783 |
cpu->cd.x86.r[X86_R_AX] |= 0x1a; |
| 784 |
cpu->cd.x86.r[X86_R_BX] &= ~0xffff; |
| 785 |
cpu->cd.x86.r[X86_R_BX] |= 0x0008; |
| 786 |
break; |
| 787 |
case 0x1b: /* State Information: TODO */ |
| 788 |
fatal("TODO: int10,1b\n"); |
| 789 |
break; |
| 790 |
case 0x4f: /* VESA */ |
| 791 |
/* TODO: See http://www.uv.tietgen.dk/staff/mlha/PC/ |
| 792 |
Prog/asm/int/INT10.htm#4F for more info. */ |
| 793 |
switch (al) { |
| 794 |
case 0x00: /* Detect VESA */ |
| 795 |
#if 0 |
| 796 |
cpu->cd.x86.r[X86_R_AX] &= ~0xffff; |
| 797 |
cpu->cd.x86.r[X86_R_AX] |= 0x004f; |
| 798 |
/* TODO: the VESA struct at ES:DI */ |
| 799 |
#endif |
| 800 |
break; |
| 801 |
case 0x01: /* Return mode info */ |
| 802 |
fatal("TODO: VESA mode 0x%04x\n", cx); |
| 803 |
break; |
| 804 |
default: |
| 805 |
fatal("TODO: int 0x10, function 0x4f, al=0x%02x\n", al); |
| 806 |
} |
| 807 |
break; |
| 808 |
case 0xef: /* Hercules Detection */ |
| 809 |
case 0xfa: /* EGA Register Interface Library */ |
| 810 |
/* TODO: How to accurately return failure? */ |
| 811 |
debug("TODO: int10,ah=0x%02x\n", ah); |
| 812 |
break; |
| 813 |
default: |
| 814 |
fatal("FATAL: Unimplemented PC BIOS interrupt 0x10 function" |
| 815 |
" 0x%02x.\n", ah); |
| 816 |
cpu->running = 0; |
| 817 |
} |
| 818 |
} |
| 819 |
|
| 820 |
|
| 821 |
/* |
| 822 |
* pc_bios_int13(): |
| 823 |
* |
| 824 |
* Disk-related functions. These usually return CF on error. |
| 825 |
*/ |
| 826 |
static void pc_bios_int13(struct cpu *cpu) |
| 827 |
{ |
| 828 |
struct pc_bios_disk *disk; |
| 829 |
int res, nread, err; |
| 830 |
int ah = (cpu->cd.x86.r[X86_R_AX] >> 8) & 0xff; |
| 831 |
int al = (cpu->cd.x86.r[X86_R_AX] >> 0) & 0xff; |
| 832 |
int dh = (cpu->cd.x86.r[X86_R_DX] >> 8) & 0xff; |
| 833 |
int dl = (cpu->cd.x86.r[X86_R_DX] >> 0) & 0xff; |
| 834 |
int ch = (cpu->cd.x86.r[X86_R_CX] >> 8) & 0xff; |
| 835 |
int cl = (cpu->cd.x86.r[X86_R_CX] >> 0) & 0xff; |
| 836 |
int bx = cpu->cd.x86.r[X86_R_BX] & 0xffff; |
| 837 |
uint64_t offset; |
| 838 |
|
| 839 |
switch (ah) { |
| 840 |
case 0x00: /* Reset disk, dl = drive */ |
| 841 |
cpu->cd.x86.rflags &= ~X86_FLAGS_CF; |
| 842 |
cpu->cd.x86.r[X86_R_AX] &= ~0xff00; |
| 843 |
/* Do nothing. :-) */ |
| 844 |
break; |
| 845 |
case 0x02: /* Read sector */ |
| 846 |
case 0x03: /* Write sector */ |
| 847 |
/* |
| 848 |
* Read/Write sector(s). al = nr of sectors |
| 849 |
* dh = head, dl = disk id (0-based), |
| 850 |
* ch = cyl, cl = 1-based starting sector nr |
| 851 |
* es:bx = destination buffer; return carryflag = error |
| 852 |
*/ |
| 853 |
cpu->cd.x86.rflags |= X86_FLAGS_CF; |
| 854 |
disk = get_disk(cpu->machine, cpu->cd.x86.r[X86_R_DX] & 0xff); |
| 855 |
if (disk != NULL) { |
| 856 |
unsigned char *buf; |
| 857 |
|
| 858 |
cpu->cd.x86.rflags &= ~X86_FLAGS_CF; |
| 859 |
ch = ch + ((cl >> 6) << 8); |
| 860 |
cl = (cl & 0x3f) - 1; |
| 861 |
offset = (cl + disk->sectorspertrack * dh + |
| 862 |
disk->sectorspertrack * disk->heads * ch) * 512; |
| 863 |
nread = 0; err = 0; |
| 864 |
debug("[ pc_bios_int13(): reading from disk 0x%x, " |
| 865 |
"CHS=%i,%i,%i ]\n", dl, ch, dh, cl); |
| 866 |
|
| 867 |
buf = malloc(512 * al); |
| 868 |
|
| 869 |
if (cl+al > disk->sectorspertrack || |
| 870 |
dh >= disk->heads || ch > disk->cylinders) { |
| 871 |
al = 0; err = 4; /* sector not found */ |
| 872 |
fatal("[ pc_bios: attempt to %s outside the d" |
| 873 |
"isk? bios id=0x%02x, chs=%i,%i,%i, acces" |
| 874 |
"s at %i,%i,%i ]\n", ah==2? "read" : |
| 875 |
"write", dl, disk->cylinders, disk->heads, |
| 876 |
disk->sectorspertrack, ch, dh, cl); |
| 877 |
} |
| 878 |
|
| 879 |
debug("[ pc_bios_int13(): %s biosdisk 0x%02x (offset=" |
| 880 |
"0x%"PRIx64") mem=0x%04x:0x%04x ]\n", ah==2? |
| 881 |
"read from" : "write to", dl, (uint64_t) offset, |
| 882 |
cpu->cd.x86.s[X86_S_ES], bx); |
| 883 |
|
| 884 |
if (ah == 3) { |
| 885 |
fatal("TODO: bios disk write\n"); |
| 886 |
/* cpu->running = 0; */ |
| 887 |
/* TODO */ |
| 888 |
al = 0; |
| 889 |
} |
| 890 |
if (al > 0) |
| 891 |
res = diskimage_access(cpu->machine, disk->id, |
| 892 |
disk->type, 0, offset, buf, al * 512); |
| 893 |
else |
| 894 |
res = 0; |
| 895 |
nread = al; |
| 896 |
if (!res) { |
| 897 |
err = 4; |
| 898 |
fatal("[ pc_bios_int13(): FAILED to %s" |
| 899 |
" biosdisk 0x%02x (offset=0x%"PRIx64")" |
| 900 |
" ]\n", ah==2? "read from" : |
| 901 |
"write to", dl, (uint64_t) offset); |
| 902 |
} else if (ah == 2) { |
| 903 |
cpu->cd.x86.cursegment = X86_S_ES; |
| 904 |
if (bx + 512*al > 0x10000) { |
| 905 |
/* DMA overrun */ |
| 906 |
fatal("[ pc_bios: DMA overrun ]\n"); |
| 907 |
err = 9; |
| 908 |
nread = al = (0x10000 - bx) / 512; |
| 909 |
} |
| 910 |
store_buf(cpu, bx, (char *)buf, 512 * al); |
| 911 |
} |
| 912 |
free(buf); |
| 913 |
cpu->cd.x86.r[X86_R_AX] &= ~0xffff; |
| 914 |
cpu->cd.x86.r[X86_R_AX] |= nread; |
| 915 |
} else |
| 916 |
err = 0x80; |
| 917 |
if (err) { |
| 918 |
cpu->cd.x86.rflags |= X86_FLAGS_CF; |
| 919 |
cpu->cd.x86.r[X86_R_AX] |= (err << 8); |
| 920 |
} |
| 921 |
break; |
| 922 |
case 4: /* verify disk sectors */ |
| 923 |
cpu->cd.x86.rflags &= ~X86_FLAGS_CF; |
| 924 |
cpu->cd.x86.r[X86_R_AX] &= ~0xff00; |
| 925 |
/* Do nothing. :-) */ |
| 926 |
break; |
| 927 |
case 8: /* get drive status: TODO */ |
| 928 |
cpu->cd.x86.rflags |= X86_FLAGS_CF; |
| 929 |
cpu->cd.x86.r[X86_R_AX] &= ~0xffff; |
| 930 |
cpu->cd.x86.r[X86_R_AX] |= 0x8080; |
| 931 |
disk = get_disk(cpu->machine, cpu->cd.x86.r[X86_R_DX] & 0xff); |
| 932 |
if (disk != NULL) { |
| 933 |
int cyl_hi, cyl_lo; |
| 934 |
|
| 935 |
cyl_lo = disk->cylinders & 255; |
| 936 |
cyl_hi = ((disk->cylinders >> 8) & 3) << 6; |
| 937 |
cyl_hi |= disk->sectorspertrack; |
| 938 |
|
| 939 |
cpu->cd.x86.r[X86_R_AX] &= ~0xffff; |
| 940 |
cpu->cd.x86.r[X86_R_BX] &= ~0xffff; |
| 941 |
if (disk->type == DISKIMAGE_FLOPPY) |
| 942 |
cpu->cd.x86.r[X86_R_BX] |= 4; |
| 943 |
cpu->cd.x86.r[X86_R_CX] &= ~0xffff; |
| 944 |
cpu->cd.x86.r[X86_R_CX] |= (cyl_lo << 8) | cyl_hi; |
| 945 |
cpu->cd.x86.r[X86_R_DX] &= ~0xffff; |
| 946 |
cpu->cd.x86.r[X86_R_DX] |= 0x01 | |
| 947 |
((disk->heads - 1) << 8); |
| 948 |
/* TODO: dl = nr of drives */ |
| 949 |
/* TODO: es:di? */ |
| 950 |
cpu->cd.x86.rflags &= ~X86_FLAGS_CF; |
| 951 |
} |
| 952 |
break; |
| 953 |
case 0x15: /* Read DASD Type */ |
| 954 |
/* TODO: generalize */ |
| 955 |
cpu->cd.x86.r[X86_R_AX] &= ~0xff00; |
| 956 |
cpu->cd.x86.r[X86_R_AX] |= 0x0100; |
| 957 |
cpu->cd.x86.rflags &= ~X86_FLAGS_CF; |
| 958 |
break; |
| 959 |
case 0x41: /* Check for Extended Functions */ |
| 960 |
/* There is no such support. :) */ |
| 961 |
cpu->cd.x86.rflags |= X86_FLAGS_CF; |
| 962 |
break; |
| 963 |
case 0x42: /* Extended Read: */ |
| 964 |
/* TODO */ |
| 965 |
cpu->cd.x86.rflags |= X86_FLAGS_CF; |
| 966 |
cpu->cd.x86.r[X86_R_AX] &= ~0xff00; |
| 967 |
cpu->cd.x86.r[X86_R_AX] |= 0x0100; |
| 968 |
break; |
| 969 |
case 0x48: /* ? */ |
| 970 |
/* TODO */ |
| 971 |
cpu->cd.x86.rflags |= X86_FLAGS_CF; |
| 972 |
break; |
| 973 |
case 0x4b: /* CDROM emulation (TODO) */ |
| 974 |
cpu->cd.x86.rflags |= X86_FLAGS_CF; |
| 975 |
break; |
| 976 |
case 0xfa: /* ? */ |
| 977 |
cpu->cd.x86.rflags |= X86_FLAGS_CF; |
| 978 |
break; |
| 979 |
default: |
| 980 |
fatal("FATAL: Unimplemented PC BIOS interrupt 0x13 function" |
| 981 |
" 0x%02x.\n", ah); |
| 982 |
cpu->running = 0; |
| 983 |
} |
| 984 |
} |
| 985 |
|
| 986 |
|
| 987 |
/* |
| 988 |
* pc_bios_int14(): |
| 989 |
* |
| 990 |
* Serial port stuff. |
| 991 |
*/ |
| 992 |
static void pc_bios_int14(struct cpu *cpu) |
| 993 |
{ |
| 994 |
int ah = (cpu->cd.x86.r[X86_R_AX] >> 8) & 0xff; |
| 995 |
|
| 996 |
switch (ah) { |
| 997 |
case 0: debug("[ pc_bios_14(): TODO ]\n"); |
| 998 |
break; |
| 999 |
default: |
| 1000 |
fatal("FATAL: Unimplemented PC BIOS interrupt 0x14 function" |
| 1001 |
" 0x%02x.\n", ah); |
| 1002 |
cpu->running = 0; |
| 1003 |
} |
| 1004 |
} |
| 1005 |
|
| 1006 |
|
| 1007 |
/* |
| 1008 |
* pc_bios_int15(): |
| 1009 |
*/ |
| 1010 |
static void pc_bios_int15(struct cpu *cpu) |
| 1011 |
{ |
| 1012 |
int ah = (cpu->cd.x86.r[X86_R_AX] >> 8) & 0xff; |
| 1013 |
int al = cpu->cd.x86.r[X86_R_AX] & 0xff; |
| 1014 |
int cx = cpu->cd.x86.r[X86_R_CX] & 0xffff; |
| 1015 |
int si = cpu->cd.x86.r[X86_R_SI] & 0xffff; |
| 1016 |
int m; |
| 1017 |
unsigned char src_entry[8]; |
| 1018 |
unsigned char dst_entry[8]; |
| 1019 |
uint32_t src_addr, dst_addr; |
| 1020 |
|
| 1021 |
switch (ah) { |
| 1022 |
case 0x00: /* TODO? */ |
| 1023 |
fatal("[ PC BIOS int 0x15,0x00: TODO ]\n"); |
| 1024 |
cpu->cd.x86.rflags |= X86_FLAGS_CF; |
| 1025 |
cpu->cd.x86.r[X86_R_AX] &= ~0xff00; |
| 1026 |
cpu->cd.x86.r[X86_R_AX] |= 0x8600; /* TODO */ |
| 1027 |
break; |
| 1028 |
case 0x06: /* TODO */ |
| 1029 |
fatal("[ PC BIOS int 0x15,0x06: TODO ]\n"); |
| 1030 |
cpu->cd.x86.rflags |= X86_FLAGS_CF; |
| 1031 |
cpu->cd.x86.r[X86_R_AX] &= ~0xff00; |
| 1032 |
cpu->cd.x86.r[X86_R_AX] |= 0x8600; /* TODO */ |
| 1033 |
break; |
| 1034 |
case 0x24: /* TODO */ |
| 1035 |
fatal("[ PC BIOS int 0x15,0x24: TODO ]\n"); |
| 1036 |
cpu->cd.x86.rflags |= X86_FLAGS_CF; |
| 1037 |
cpu->cd.x86.r[X86_R_AX] &= ~0xff00; |
| 1038 |
cpu->cd.x86.r[X86_R_AX] |= 0x8600; /* TODO */ |
| 1039 |
break; |
| 1040 |
case 0x41: /* TODO */ |
| 1041 |
fatal("[ PC BIOS int 0x15,0x41: TODO ]\n"); |
| 1042 |
cpu->cd.x86.rflags |= X86_FLAGS_CF; |
| 1043 |
cpu->cd.x86.r[X86_R_AX] &= ~0xff00; |
| 1044 |
cpu->cd.x86.r[X86_R_AX] |= 0x8600; /* TODO */ |
| 1045 |
break; |
| 1046 |
case 0x4f: /* Keyboard Scancode Intercept (TODO) */ |
| 1047 |
cpu->cd.x86.rflags |= X86_FLAGS_CF; |
| 1048 |
break; |
| 1049 |
case 0x53: /* TODO */ |
| 1050 |
fatal("[ PC BIOS int 0x15,0x53: TODO ]\n"); |
| 1051 |
cpu->cd.x86.rflags |= X86_FLAGS_CF; |
| 1052 |
break; |
| 1053 |
case 0x86: /* Wait */ |
| 1054 |
/* No. :-) */ |
| 1055 |
cpu->cd.x86.rflags &= ~X86_FLAGS_CF; |
| 1056 |
break; |
| 1057 |
case 0x87: /* Move to/from extended memory, via a GDT */ |
| 1058 |
cpu->cd.x86.cursegment = X86_S_ES; |
| 1059 |
cpu->memory_rw(cpu, cpu->mem, si + 0x10, src_entry, 8, |
| 1060 |
MEM_READ, CACHE_DATA); |
| 1061 |
cpu->memory_rw(cpu, cpu->mem, si + 0x18, dst_entry, 8, |
| 1062 |
MEM_READ, CACHE_DATA); |
| 1063 |
src_addr = src_entry[2]+(src_entry[3]<<8)+(src_entry[4]<<16); |
| 1064 |
dst_addr = dst_entry[2]+(dst_entry[3]<<8)+(dst_entry[4]<<16); |
| 1065 |
if (src_entry[5] != 0x92 && src_entry[5] != 0x93) |
| 1066 |
fatal("WARNING: int15,87: bad src access right?" |
| 1067 |
" (0x%02x, should be 0x93)\n", src_entry[5]); |
| 1068 |
if (dst_entry[5] != 0x92 && dst_entry[5] != 0x93) |
| 1069 |
fatal("WARNING: int15,87: bad dst access right?" |
| 1070 |
" (0x%02x, should be 0x93)\n", dst_entry[5]); |
| 1071 |
debug("[ pc_bios: INT15: copying %i bytes from 0x%x to 0x%x" |
| 1072 |
" ]\n", cx*2, src_addr, dst_addr); |
| 1073 |
if (cx > 0x8000) |
| 1074 |
fatal("WARNING! INT15 func 0x87 cx=0x%04x, max allowed" |
| 1075 |
" is supposed to be 0x8000!\n", cx); |
| 1076 |
while (cx*2 > 0) { |
| 1077 |
unsigned char buf[2]; |
| 1078 |
cpu->memory_rw(cpu, cpu->mem, src_addr, buf, 2, |
| 1079 |
MEM_READ, NO_SEGMENTATION | CACHE_DATA); |
| 1080 |
cpu->memory_rw(cpu, cpu->mem, dst_addr, buf, 2, |
| 1081 |
MEM_WRITE, NO_SEGMENTATION | CACHE_DATA); |
| 1082 |
src_addr += 2; dst_addr += 2; cx --; |
| 1083 |
} |
| 1084 |
cpu->cd.x86.r[X86_R_AX] &= ~0xff00; |
| 1085 |
cpu->cd.x86.rflags &= ~X86_FLAGS_CF; |
| 1086 |
cpu->cd.x86.rflags |= X86_FLAGS_ZF; |
| 1087 |
break; |
| 1088 |
case 0x88: /* Extended Memory Size Determination */ |
| 1089 |
/* TODO: Max 16 or 64 MB? */ |
| 1090 |
cpu->cd.x86.rflags &= ~X86_FLAGS_CF; |
| 1091 |
cpu->cd.x86.r[X86_R_AX] &= ~0xffff; |
| 1092 |
if (cpu->machine->physical_ram_in_mb <= 64) |
| 1093 |
cpu->cd.x86.r[X86_R_AX] |= (cpu->machine-> |
| 1094 |
physical_ram_in_mb - 1) * 1024; |
| 1095 |
else |
| 1096 |
cpu->cd.x86.r[X86_R_AX] |= 63*1024; |
| 1097 |
break; |
| 1098 |
case 0x8A: /* Get "Big" memory size */ |
| 1099 |
cpu->cd.x86.rflags &= ~X86_FLAGS_CF; |
| 1100 |
m = (cpu->machine->physical_ram_in_mb - 1) * 1024; |
| 1101 |
cpu->cd.x86.r[X86_R_DX] &= ~0xffff; |
| 1102 |
cpu->cd.x86.r[X86_R_AX] &= ~0xffff; |
| 1103 |
cpu->cd.x86.r[X86_R_DX] |= ((m >> 16) & 0xffff); |
| 1104 |
cpu->cd.x86.r[X86_R_AX] |= (m & 0xffff); |
| 1105 |
break; |
| 1106 |
case 0x91: /* Interrupt Complete (bogus) */ |
| 1107 |
cpu->cd.x86.rflags &= ~X86_FLAGS_CF; |
| 1108 |
break; |
| 1109 |
case 0xc0: /* System Config: (at 0xfffd:0) */ |
| 1110 |
cpu->cd.x86.rflags &= ~X86_FLAGS_CF; |
| 1111 |
cpu->cd.x86.r[X86_R_AX] &= ~0xff00; |
| 1112 |
cpu->cd.x86.r[X86_R_BX] &= ~0xffff; |
| 1113 |
cpu->cd.x86.s[X86_S_ES] = 0xfffd; |
| 1114 |
reload_segment_descriptor(cpu, X86_S_ES, 0xfffd, NULL); |
| 1115 |
break; |
| 1116 |
case 0xc1: /* Extended Bios Data-seg (TODO) */ |
| 1117 |
cpu->cd.x86.rflags |= X86_FLAGS_CF; |
| 1118 |
break; |
| 1119 |
case 0xe8: /* TODO */ |
| 1120 |
switch (al) { |
| 1121 |
case 0x01: |
| 1122 |
cpu->cd.x86.rflags &= ~X86_FLAGS_CF; |
| 1123 |
m = cpu->machine->physical_ram_in_mb; |
| 1124 |
if (m > 16) |
| 1125 |
m = 16; |
| 1126 |
m = (m - 1) * 1024; |
| 1127 |
/* between 1MB and 16MB: (1KB blocks) */ |
| 1128 |
cpu->cd.x86.r[X86_R_AX] &= ~0xffff; |
| 1129 |
cpu->cd.x86.r[X86_R_AX] |= (m & 0xffff); |
| 1130 |
/* mem above 16MB, 64K blocks: */ |
| 1131 |
m = cpu->machine->physical_ram_in_mb; |
| 1132 |
if (m < 16) |
| 1133 |
m = 0; |
| 1134 |
else |
| 1135 |
m = (m-16) / 16; |
| 1136 |
cpu->cd.x86.r[X86_R_BX] &= ~0xffff; |
| 1137 |
cpu->cd.x86.r[X86_R_BX] |= (m & 0xffff); |
| 1138 |
/* CX and DX are "configured" memory */ |
| 1139 |
cpu->cd.x86.r[X86_R_CX] &= ~0xffff; |
| 1140 |
cpu->cd.x86.r[X86_R_DX] &= ~0xffff; |
| 1141 |
cpu->cd.x86.r[X86_R_CX] |= ( |
| 1142 |
cpu->cd.x86.r[X86_R_AX] & 0xffff); |
| 1143 |
cpu->cd.x86.r[X86_R_DX] |= ( |
| 1144 |
cpu->cd.x86.r[X86_R_BX] & 0xffff); |
| 1145 |
break; |
| 1146 |
case 0x20: /* Get memory map: TODO */ |
| 1147 |
cpu->cd.x86.rflags |= X86_FLAGS_CF; |
| 1148 |
cpu->cd.x86.r[X86_R_AX] &= ~0xff00; |
| 1149 |
cpu->cd.x86.r[X86_R_AX] |= 0x8600; |
| 1150 |
break; |
| 1151 |
default:fatal("[ PC BIOS int 0x15,0xe8: al=0x%02x " |
| 1152 |
" TODO ]\n", al); |
| 1153 |
cpu->running = 0; |
| 1154 |
} |
| 1155 |
break; |
| 1156 |
default: |
| 1157 |
fatal("FATAL: Unimplemented PC BIOS interrupt 0x15 function" |
| 1158 |
" 0x%02x.\n", ah); |
| 1159 |
cpu->running = 0; |
| 1160 |
} |
| 1161 |
} |
| 1162 |
|
| 1163 |
|
| 1164 |
/* |
| 1165 |
* pc_bios_int16(): |
| 1166 |
* |
| 1167 |
* Keyboard-related functions. |
| 1168 |
*/ |
| 1169 |
static int pc_bios_int16(struct cpu *cpu, int *enable_ints_after_returnp) |
| 1170 |
{ |
| 1171 |
int ah = (cpu->cd.x86.r[X86_R_AX] >> 8) & 0xff; |
| 1172 |
/* int al = cpu->cd.x86.r[X86_R_AX] & 0xff; */ |
| 1173 |
int scancode, asciicode; |
| 1174 |
unsigned char tmpchar; |
| 1175 |
|
| 1176 |
switch (ah) { |
| 1177 |
case 0x00: /* getchar */ |
| 1178 |
scancode = asciicode = 0; |
| 1179 |
if (cpu->machine->md.pc.kbd_buf_head != |
| 1180 |
cpu->machine->md.pc.kbd_buf_tail) { |
| 1181 |
asciicode = cpu->machine->md.pc.kbd_buf[ |
| 1182 |
cpu->machine->md.pc.kbd_buf_head]; |
| 1183 |
scancode = cpu->machine->md.pc.kbd_buf_scancode[ |
| 1184 |
cpu->machine->md.pc.kbd_buf_head]; |
| 1185 |
if (asciicode != 0) { |
| 1186 |
cpu->cd.x86.r[X86_R_AX] = |
| 1187 |
(scancode << 8) | asciicode; |
| 1188 |
} |
| 1189 |
cpu->machine->md.pc.kbd_buf_head ++; |
| 1190 |
cpu->machine->md.pc.kbd_buf_head %= |
| 1191 |
PC_BIOS_KBD_BUF_SIZE; |
| 1192 |
} |
| 1193 |
*enable_ints_after_returnp = 1; |
| 1194 |
if (asciicode == 0) |
| 1195 |
return 0; |
| 1196 |
break; |
| 1197 |
case 0x01: /* non-destructive "isavail" */ |
| 1198 |
cpu->cd.x86.rflags |= X86_FLAGS_ZF; |
| 1199 |
cpu->cd.x86.r[X86_R_AX] &= ~0xffff; |
| 1200 |
scancode = asciicode = 0; |
| 1201 |
if (cpu->machine->md.pc.kbd_buf_head != |
| 1202 |
cpu->machine->md.pc.kbd_buf_tail) { |
| 1203 |
asciicode = cpu->machine->md.pc.kbd_buf[ |
| 1204 |
cpu->machine->md.pc.kbd_buf_head]; |
| 1205 |
scancode = cpu->machine->md.pc.kbd_buf_scancode[ |
| 1206 |
cpu->machine->md.pc.kbd_buf_head]; |
| 1207 |
cpu->cd.x86.rflags &= ~X86_FLAGS_ZF; |
| 1208 |
cpu->cd.x86.r[X86_R_AX] |= (scancode << 8) | asciicode; |
| 1209 |
} |
| 1210 |
*enable_ints_after_returnp = 1; |
| 1211 |
break; |
| 1212 |
case 0x02: /* read keyboard flags */ |
| 1213 |
/* TODO: keep this byte updated */ |
| 1214 |
cpu->memory_rw(cpu, cpu->mem, 0x417, &tmpchar, 1, |
| 1215 |
MEM_READ, PHYSICAL); |
| 1216 |
cpu->cd.x86.r[X86_R_AX] = (cpu->cd.x86.r[X86_R_AX] & ~0xff) |
| 1217 |
| tmpchar; |
| 1218 |
break; |
| 1219 |
case 0x03: /* Set Keyboard Typematic Rate: TODO */ |
| 1220 |
break; |
| 1221 |
case 0x55: /* Microsoft stuff: Ignore :-) */ |
| 1222 |
break; |
| 1223 |
case 0x92: /* Keyboard "Capabilities Check": TODO */ |
| 1224 |
break; |
| 1225 |
default: |
| 1226 |
fatal("FATAL: Unimplemented PC BIOS interrupt 0x16 function" |
| 1227 |
" 0x%02x.\n", ah); |
| 1228 |
cpu->running = 0; |
| 1229 |
} |
| 1230 |
|
| 1231 |
return 1; |
| 1232 |
} |
| 1233 |
|
| 1234 |
|
| 1235 |
/* |
| 1236 |
* pc_bios_int17(): |
| 1237 |
* |
| 1238 |
* Printer port stuff. |
| 1239 |
*/ |
| 1240 |
static void pc_bios_int17(struct cpu *cpu) |
| 1241 |
{ |
| 1242 |
int ah = (cpu->cd.x86.r[X86_R_AX] >> 8) & 0xff; |
| 1243 |
|
| 1244 |
switch (ah) { |
| 1245 |
case 0x01: |
| 1246 |
debug("[ PC BIOS int 0x17,0x01: TODO ]\n"); |
| 1247 |
cpu->cd.x86.r[X86_R_AX] &= ~0xff00; |
| 1248 |
break; |
| 1249 |
default: |
| 1250 |
fatal("FATAL: Unimplemented PC BIOS interrupt 0x17 function" |
| 1251 |
" 0x%02x.\n", ah); |
| 1252 |
cpu->running = 0; |
| 1253 |
} |
| 1254 |
} |
| 1255 |
|
| 1256 |
|
| 1257 |
/* |
| 1258 |
* pc_bios_int1a(): |
| 1259 |
* |
| 1260 |
* Time of Day stuff. |
| 1261 |
*/ |
| 1262 |
static void pc_bios_int1a(struct cpu *cpu) |
| 1263 |
{ |
| 1264 |
unsigned char ticks[4]; |
| 1265 |
int ah = (cpu->cd.x86.r[X86_R_AX] >> 8) & 0xff; |
| 1266 |
time_t tim; |
| 1267 |
struct tm *tm; |
| 1268 |
|
| 1269 |
switch (ah) { |
| 1270 |
case 0x00: /* Read tick count. */ |
| 1271 |
cpu->memory_rw(cpu, cpu->mem, 0x46C, |
| 1272 |
ticks, sizeof(ticks), MEM_READ, CACHE_NONE | PHYSICAL); |
| 1273 |
cpu->cd.x86.r[X86_R_CX] = (ticks[3] << 8) | ticks[2]; |
| 1274 |
cpu->cd.x86.r[X86_R_DX] = (ticks[1] << 8) | ticks[0]; |
| 1275 |
break; |
| 1276 |
case 0x01: /* Set tick count. */ |
| 1277 |
ticks[0] = cpu->cd.x86.r[X86_R_DX]; |
| 1278 |
ticks[1] = cpu->cd.x86.r[X86_R_DX] >> 8; |
| 1279 |
ticks[2] = cpu->cd.x86.r[X86_R_CX]; |
| 1280 |
ticks[3] = cpu->cd.x86.r[X86_R_CX] >> 8; |
| 1281 |
cpu->memory_rw(cpu, cpu->mem, 0x46C, |
| 1282 |
ticks, sizeof(ticks), MEM_WRITE, CACHE_NONE | PHYSICAL); |
| 1283 |
break; |
| 1284 |
case 0x02: /* Read real time clock time (AT,PS/2) */ |
| 1285 |
tim = time(NULL); |
| 1286 |
tm = gmtime(&tim); |
| 1287 |
cpu->cd.x86.r[X86_R_CX] &= ~0xffff; |
| 1288 |
cpu->cd.x86.r[X86_R_DX] &= ~0xffff; |
| 1289 |
cpu->cd.x86.r[X86_R_CX] |= (dec_to_bcd(tm->tm_hour) << 8) | |
| 1290 |
dec_to_bcd(tm->tm_min); |
| 1291 |
cpu->cd.x86.r[X86_R_DX] |= dec_to_bcd(tm->tm_sec) << 8; |
| 1292 |
cpu->cd.x86.rflags &= ~X86_FLAGS_CF; |
| 1293 |
break; |
| 1294 |
case 0x04: /* Read real time clock date (AT,PS/2) */ |
| 1295 |
tim = time(NULL); |
| 1296 |
tm = gmtime(&tim); |
| 1297 |
cpu->cd.x86.r[X86_R_CX] &= ~0xffff; |
| 1298 |
cpu->cd.x86.r[X86_R_DX] &= ~0xffff; |
| 1299 |
cpu->cd.x86.r[X86_R_CX] |= |
| 1300 |
(dec_to_bcd((tm->tm_year+1900)/100) << 8) | |
| 1301 |
dec_to_bcd(tm->tm_year % 100); |
| 1302 |
cpu->cd.x86.r[X86_R_DX] |= (dec_to_bcd(tm->tm_mon+1) << 8) | |
| 1303 |
dec_to_bcd(tm->tm_mday); |
| 1304 |
cpu->cd.x86.rflags &= ~X86_FLAGS_CF; |
| 1305 |
break; |
| 1306 |
case 0xb1: /* Intel PCI Bios */ |
| 1307 |
/* ... not installed :) */ |
| 1308 |
cpu->cd.x86.rflags |= X86_FLAGS_CF; |
| 1309 |
break; |
| 1310 |
default: |
| 1311 |
fatal("FATAL: Unimplemented PC BIOS interrupt 0x1a function" |
| 1312 |
" 0x%02x.\n", ah); |
| 1313 |
cpu->running = 0; |
| 1314 |
} |
| 1315 |
} |
| 1316 |
|
| 1317 |
|
| 1318 |
/* |
| 1319 |
* pc_bios_int1c(): |
| 1320 |
* |
| 1321 |
* Increase the timer-tick word at 0x40:0x6C. |
| 1322 |
*/ |
| 1323 |
static void pc_bios_int1c(struct cpu *cpu) |
| 1324 |
{ |
| 1325 |
unsigned char ticks[4]; |
| 1326 |
size_t i; |
| 1327 |
|
| 1328 |
/* Increase word at 0x0040:0x006C */ |
| 1329 |
cpu->memory_rw(cpu, cpu->mem, 0x46C, |
| 1330 |
ticks, sizeof(ticks), MEM_READ, CACHE_NONE | PHYSICAL); |
| 1331 |
for (i=0; i<sizeof(ticks); i++) { |
| 1332 |
ticks[i] ++; |
| 1333 |
if (ticks[i] != 0) |
| 1334 |
break; |
| 1335 |
} |
| 1336 |
cpu->memory_rw(cpu, cpu->mem, 0x46C, |
| 1337 |
ticks, sizeof(ticks), MEM_WRITE, CACHE_NONE | PHYSICAL); |
| 1338 |
} |
| 1339 |
|
| 1340 |
|
| 1341 |
/* |
| 1342 |
* pc_bios_smp_init(): |
| 1343 |
* |
| 1344 |
* Initialize the "_MP_" struct in BIOS memory. |
| 1345 |
* |
| 1346 |
* TODO: Don't use hardcoded values like this. |
| 1347 |
*/ |
| 1348 |
void pc_bios_smp_init(struct cpu *cpu) |
| 1349 |
{ |
| 1350 |
int i, chksum; |
| 1351 |
|
| 1352 |
reload_segment_descriptor(cpu, X86_S_FS, 0xf000, NULL); |
| 1353 |
store_buf(cpu, 0x9000, "_MP_", 4); |
| 1354 |
store_byte(cpu, 0x9004, 0x10); /* ptr to table */ |
| 1355 |
store_byte(cpu, 0x9005, 0x90); |
| 1356 |
store_byte(cpu, 0x9006, 0x0f); |
| 1357 |
store_byte(cpu, 0x9007, 0x00); |
| 1358 |
store_byte(cpu, 0x9008, 0x01); /* length. should be 1 */ |
| 1359 |
store_byte(cpu, 0x9009, 0x04); /* version. 4 means "1.4" */ |
| 1360 |
/* Byte at 0x0a is checksum. TODO: make this automagic */ |
| 1361 |
chksum = '_' + 'M' + 'P' + '_' + 0x10 + 0x90 + 0xf + 1 + 4; |
| 1362 |
store_byte(cpu, 0x900a, 0 - chksum); |
| 1363 |
|
| 1364 |
/* PCMP struct, at addr 0x9010. */ |
| 1365 |
store_buf(cpu, 0x9010, "PCMP", 4); |
| 1366 |
store_16bit_word(cpu, 0x9014, 43); |
| 1367 |
store_byte(cpu, 0x9016, 4); /* rev 1.4 */ |
| 1368 |
/* 9017 is checksum */ |
| 1369 |
store_buf(cpu, 0x9018, "GXemul ", 8); |
| 1370 |
store_buf(cpu, 0x9020, "SMP ", 12); |
| 1371 |
|
| 1372 |
/* Nr of entries (one per cpu): */ |
| 1373 |
store_16bit_word(cpu, 0x9010 + 34, cpu->machine->ncpus); |
| 1374 |
|
| 1375 |
if (cpu->machine->ncpus > 16) |
| 1376 |
fatal("WARNING: More than 16 CPUs?\n"); |
| 1377 |
|
| 1378 |
for (i=0; i<cpu->machine->ncpus; i++) { |
| 1379 |
int ofs = 44 + 20*i; |
| 1380 |
/* 20 bytes per CPU: */ |
| 1381 |
store_byte(cpu, 0x9010 + ofs + 0, 0x00); /* cpu */ |
| 1382 |
store_byte(cpu, 0x9010 + ofs + 1, i); /* id */ |
| 1383 |
store_byte(cpu, 0x9010 + ofs + 3, 1 | /* enable */ |
| 1384 |
((i == cpu->machine->bootstrap_cpu)? 2 : 0)); |
| 1385 |
} |
| 1386 |
} |
| 1387 |
|
| 1388 |
|
| 1389 |
/* |
| 1390 |
* pc_bios_simple_pmode_setup(): |
| 1391 |
* |
| 1392 |
* This function is called from emul.c before loading a 32-bit or 64-bit ELF. |
| 1393 |
* Loading ELFs when the emulation is set to 16-bit real mode is not a good |
| 1394 |
* thing, so this function sets up a simple GDT which maps every 0xZyyyyyyy |
| 1395 |
* to 0x0yyyyyyy. |
| 1396 |
* |
| 1397 |
* 0xf4000 GDT: |
| 1398 |
* 00 = NULL |
| 1399 |
* 08 = code |
| 1400 |
* 10 = data |
| 1401 |
*/ |
| 1402 |
void pc_bios_simple_pmode_setup(struct cpu *cpu) |
| 1403 |
{ |
| 1404 |
int i, j, addr = 0, npts; |
| 1405 |
uint32_t pt_base; |
| 1406 |
cpu->cd.x86.cursegment = X86_S_FS; |
| 1407 |
reload_segment_descriptor(cpu, X86_S_FS, 0xf100, NULL); |
| 1408 |
|
| 1409 |
/* 0x00 = NULL descriptor. */ |
| 1410 |
addr += 8; |
| 1411 |
|
| 1412 |
/* 0x08 = Code descriptor. */ |
| 1413 |
store_byte(cpu, addr + 0, 0xff); |
| 1414 |
store_byte(cpu, addr + 1, 0xff); |
| 1415 |
store_byte(cpu, addr + 2, 0x00); |
| 1416 |
store_byte(cpu, addr + 3, 0x00); |
| 1417 |
store_byte(cpu, addr + 4, 0x00); |
| 1418 |
store_byte(cpu, addr + 5, 0x9f); |
| 1419 |
store_byte(cpu, addr + 6, 0xcf); |
| 1420 |
store_byte(cpu, addr + 7, 0x00); |
| 1421 |
addr += 8; |
| 1422 |
|
| 1423 |
/* 0x10 = Data descriptor. */ |
| 1424 |
store_byte(cpu, addr + 0, 0xff); |
| 1425 |
store_byte(cpu, addr + 1, 0xff); |
| 1426 |
store_byte(cpu, addr + 2, 0x00); |
| 1427 |
store_byte(cpu, addr + 3, 0x00); |
| 1428 |
store_byte(cpu, addr + 4, 0x00); |
| 1429 |
store_byte(cpu, addr + 5, 0x93); |
| 1430 |
store_byte(cpu, addr + 6, 0xcf); |
| 1431 |
store_byte(cpu, addr + 7, 0x00); |
| 1432 |
addr += 8; |
| 1433 |
|
| 1434 |
cpu->cd.x86.gdtr = 0xf1000; |
| 1435 |
cpu->cd.x86.gdtr_limit = 0xfff; |
| 1436 |
|
| 1437 |
addr = 0x1000; |
| 1438 |
cpu->cd.x86.cr[3] = 0xf2000; |
| 1439 |
|
| 1440 |
npts = 4; |
| 1441 |
pt_base = 0xf3000; /* 0xf3000, f4000, f5000, f6000 */ |
| 1442 |
|
| 1443 |
/* Set up the page directory: */ |
| 1444 |
for (i=0; i<1024; i++) { |
| 1445 |
uint32_t pde = pt_base + 0x03 + ((i & (npts-1)) << 12); |
| 1446 |
store_32bit_word(cpu, addr + i*4, pde); |
| 1447 |
} |
| 1448 |
addr += 4096; |
| 1449 |
|
| 1450 |
/* Set up the page tables: */ |
| 1451 |
for (i=0; i<npts; i++) { |
| 1452 |
for (j=0; j<1024; j++) { |
| 1453 |
uint32_t pte = (i << 22) + (j << 12) + 0x03; |
| 1454 |
store_32bit_word(cpu, addr + j*4, pte); |
| 1455 |
} |
| 1456 |
addr += 4096; |
| 1457 |
} |
| 1458 |
|
| 1459 |
cpu->cd.x86.cr[0] |= X86_CR0_PE | X86_CR0_PG; |
| 1460 |
|
| 1461 |
/* Interrupts are dangerous when we start in pmode! */ |
| 1462 |
cpu->cd.x86.rflags &= ~X86_FLAGS_IF; |
| 1463 |
|
| 1464 |
reload_segment_descriptor(cpu, X86_S_CS, 0x08, NULL); |
| 1465 |
reload_segment_descriptor(cpu, X86_S_DS, 0x10, NULL); |
| 1466 |
reload_segment_descriptor(cpu, X86_S_ES, 0x10, NULL); |
| 1467 |
reload_segment_descriptor(cpu, X86_S_SS, 0x10, NULL); |
| 1468 |
cpu->cd.x86.r[X86_R_SP] = 0x7000; |
| 1469 |
cpu->cd.x86.cursegment = X86_S_DS; |
| 1470 |
} |
| 1471 |
|
| 1472 |
|
| 1473 |
/* |
| 1474 |
* pc_bios_init(): |
| 1475 |
*/ |
| 1476 |
void pc_bios_init(struct cpu *cpu) |
| 1477 |
{ |
| 1478 |
char t[81]; |
| 1479 |
int x, y, nboxlines, i, any_disk = 0, disknr, tmp; |
| 1480 |
int old_cursegment = cpu->cd.x86.cursegment; |
| 1481 |
int boot_id, boot_type, bios_boot_id = 0, nfloppies = 0, nhds = 0; |
| 1482 |
|
| 1483 |
/* Go to real mode: */ |
| 1484 |
cpu->cd.x86.cr[0] &= ~X86_CR0_PE; |
| 1485 |
|
| 1486 |
boot_id = diskimage_bootdev(cpu->machine, &boot_type); |
| 1487 |
|
| 1488 |
if (cpu->machine->md.pc.initialized) { |
| 1489 |
fatal("ERROR: pc_bios_init(): Already initialized.\n"); |
| 1490 |
return; |
| 1491 |
} |
| 1492 |
|
| 1493 |
if (cpu->machine->isa_pic_data.pic1 == NULL) { |
| 1494 |
fatal("ERROR: No interrupt controller?\n"); |
| 1495 |
exit(1); |
| 1496 |
} else |
| 1497 |
cpu->machine->isa_pic_data.pic1->irq_base = 0x08; |
| 1498 |
|
| 1499 |
/* pic2 can be NULL when emulating an original XT: */ |
| 1500 |
if (cpu->machine->isa_pic_data.pic2 != NULL) |
| 1501 |
cpu->machine->isa_pic_data.pic2->irq_base = 0x70; |
| 1502 |
|
| 1503 |
/* Disk Base Table (11 or 12 bytes?) at F000h:EFC7: */ |
| 1504 |
cpu->cd.x86.cursegment = X86_S_FS; |
| 1505 |
reload_segment_descriptor(cpu, X86_S_FS, 0xf000, NULL); |
| 1506 |
store_byte(cpu, 0xefc7 + 0, 0xcf); |
| 1507 |
store_byte(cpu, 0xefc7 + 1, 0xb8); |
| 1508 |
store_byte(cpu, 0xefc7 + 2, 1); /* timer ticks till shutoff */ |
| 1509 |
store_byte(cpu, 0xefc7 + 3, 2); /* 512 bytes per sector */ |
| 1510 |
store_byte(cpu, 0xefc7 + 4, 17); |
| 1511 |
store_byte(cpu, 0xefc7 + 5, 0xd8); |
| 1512 |
store_byte(cpu, 0xefc7 + 6, 0xff); |
| 1513 |
store_byte(cpu, 0xefc7 + 7, 0); |
| 1514 |
store_byte(cpu, 0xefc7 + 8, 0xf6); |
| 1515 |
store_byte(cpu, 0xefc7 + 9, 1); /* head bounce delay in msec */ |
| 1516 |
store_byte(cpu, 0xefc7 + 10, 1);/* motor start time in 1/8 secs */ |
| 1517 |
store_byte(cpu, 0xefc7 + 11, 1);/* motor stop time in 1/4 secs */ |
| 1518 |
|
| 1519 |
/* BIOS System Configuration Parameters (8 bytes) at 0xfffd:0: */ |
| 1520 |
reload_segment_descriptor(cpu, X86_S_FS, 0xfffd, NULL); |
| 1521 |
store_byte(cpu, 0, 8); store_byte(cpu, 1, 0); /* len */ |
| 1522 |
store_byte(cpu, 2, 0xfc); /* model */ |
| 1523 |
store_byte(cpu, 3, 0); /* sub-model */ |
| 1524 |
store_byte(cpu, 4, 0); /* bios revision */ |
| 1525 |
store_byte(cpu, 5, 0x60); /* features */ |
| 1526 |
/* see http://members.tripod.com/~oldboard/assembly/ |
| 1527 |
int_15-c0.html for details */ |
| 1528 |
|
| 1529 |
/* Some info in the last paragraph of the BIOS: */ |
| 1530 |
reload_segment_descriptor(cpu, X86_S_FS, 0xffff, NULL); |
| 1531 |
/* TODO: current date :-) */ |
| 1532 |
store_byte(cpu, 0x05, '0'); store_byte(cpu, 0x06, '1'); |
| 1533 |
store_byte(cpu, 0x07, '/'); |
| 1534 |
store_byte(cpu, 0x08, '0'); store_byte(cpu, 0x09, '1'); |
| 1535 |
store_byte(cpu, 0x0a, '/'); |
| 1536 |
store_byte(cpu, 0x0b, '0'); store_byte(cpu, 0x0c, '5'); |
| 1537 |
store_byte(cpu, 0x0e, 0xfc); |
| 1538 |
|
| 1539 |
/* Copy the first 128 chars of the 8x8 VGA font into 0xf000:0xfa6e */ |
| 1540 |
reload_segment_descriptor(cpu, X86_S_FS, 0xf000, NULL); |
| 1541 |
store_buf(cpu, 0xfa6e, (char *)font8x8, 8*128); |
| 1542 |
store_buf(cpu, 0xfa6e - 1024, (char *)font8x8 + 1024, 8*128); |
| 1543 |
|
| 1544 |
/* |
| 1545 |
* Initialize all real-mode interrupt vectors to point to somewhere |
| 1546 |
* within the PC BIOS area (0xf000:0x8yy0), and place an IRET |
| 1547 |
* instruction (too fool someone who really reads the BIOS memory). |
| 1548 |
*/ |
| 1549 |
for (i=0; i<256; i++) { |
| 1550 |
if (i == 0x20) |
| 1551 |
i = 0x70; |
| 1552 |
if (i == 0x78) |
| 1553 |
break; |
| 1554 |
reload_segment_descriptor(cpu, X86_S_FS, 0x0000, NULL); |
| 1555 |
store_16bit_word(cpu, i*4, 0x8000 + i*16); |
| 1556 |
store_16bit_word(cpu, i*4 + 2, 0xf000); |
| 1557 |
|
| 1558 |
/* Exceptions: int 0x1e = ptr to disk table, 1f=fonthigh */ |
| 1559 |
if (i == 0x1e) |
| 1560 |
store_16bit_word(cpu, i*4, 0xefc7); |
| 1561 |
if (i == 0x1f) |
| 1562 |
store_16bit_word(cpu, i*4, 0xfa6e - 1024); |
| 1563 |
|
| 1564 |
reload_segment_descriptor(cpu, X86_S_FS, 0xf000, NULL); |
| 1565 |
store_byte(cpu, 0x8000 + i*16, 0xCF); /* IRET */ |
| 1566 |
} |
| 1567 |
|
| 1568 |
/* For SMP emulation, create an "MP" struct in BIOS memory: */ |
| 1569 |
if (cpu->machine->ncpus > 1) |
| 1570 |
pc_bios_smp_init(cpu); |
| 1571 |
|
| 1572 |
/* Prepare for text mode: (0x03 = 80x25, 0x01 = 40x25) */ |
| 1573 |
set_video_mode(cpu, 0x03); |
| 1574 |
|
| 1575 |
cmos_write(cpu, 0x15, 640 & 255); |
| 1576 |
cmos_write(cpu, 0x16, 640 >> 8); |
| 1577 |
tmp = cpu->machine->physical_ram_in_mb / 1024; |
| 1578 |
if (tmp > 63*1024) |
| 1579 |
tmp = 63*1024; |
| 1580 |
cmos_write(cpu, 0x17, tmp & 255); |
| 1581 |
cmos_write(cpu, 0x18, tmp >> 8); |
| 1582 |
|
| 1583 |
/* Clear the screen first: */ |
| 1584 |
set_cursor_pos(cpu, 0, 0); |
| 1585 |
for (y=0; y<cpu->machine->md.pc.rows; y++) |
| 1586 |
for (x=0; x<cpu->machine->md.pc.columns; x++) |
| 1587 |
output_char(cpu, x,y, ' ', 0x07); |
| 1588 |
|
| 1589 |
nboxlines = cpu->machine->md.pc.columns <= 40? 4 : 3; |
| 1590 |
|
| 1591 |
/* Draw a nice box at the top: */ |
| 1592 |
for (y=0; y<nboxlines; y++) |
| 1593 |
for (x=0; x<cpu->machine->md.pc.columns; x++) { |
| 1594 |
unsigned char ch = ' '; |
| 1595 |
if (cpu->machine->use_x11) { |
| 1596 |
if (y == 0) { |
| 1597 |
ch = 196; |
| 1598 |
if (x == 0) |
| 1599 |
ch = 218; |
| 1600 |
if (x == cpu->machine->md.pc.columns-1) |
| 1601 |
ch = 191; |
| 1602 |
} else if (y == nboxlines-1) { |
| 1603 |
ch = 196; |
| 1604 |
if (x == 0) |
| 1605 |
ch = 192; |
| 1606 |
if (x == cpu->machine->md.pc.columns-1) |
| 1607 |
ch = 217; |
| 1608 |
} else if (x == 0 || x == |
| 1609 |
cpu->machine->md.pc.columns-1) |
| 1610 |
ch = 179; |
| 1611 |
} else { |
| 1612 |
if (y == 0 || y == nboxlines-1) { |
| 1613 |
ch = '-'; |
| 1614 |
if (x == 0 || x == |
| 1615 |
cpu->machine->md.pc.columns-1) |
| 1616 |
ch = '+'; |
| 1617 |
} else { |
| 1618 |
if (x == 0 || x == |
| 1619 |
cpu->machine->md.pc.columns-1) |
| 1620 |
ch = '|'; |
| 1621 |
} |
| 1622 |
} |
| 1623 |
output_char(cpu, x,y, ch, 0x19); |
| 1624 |
} |
| 1625 |
|
| 1626 |
snprintf(t, sizeof(t), "GXemul"); |
| 1627 |
#ifdef VERSION |
| 1628 |
snprintf(t + strlen(t), sizeof(t)-strlen(t), " "VERSION); |
| 1629 |
#endif |
| 1630 |
set_cursor_pos(cpu, 2, 1); |
| 1631 |
pc_bios_printstr(cpu, t, 0x1f); |
| 1632 |
|
| 1633 |
snprintf(t, sizeof(t), "%i cpu%s (%s), %i MB memory", |
| 1634 |
cpu->machine->ncpus, cpu->machine->ncpus > 1? "s" : "", |
| 1635 |
cpu->cd.x86.model.name, cpu->machine->physical_ram_in_mb); |
| 1636 |
if (cpu->machine->md.pc.columns <= 40) |
| 1637 |
set_cursor_pos(cpu, 2, 2); |
| 1638 |
else |
| 1639 |
set_cursor_pos(cpu, 78 - strlen(t), 1); |
| 1640 |
pc_bios_printstr(cpu, t, 0x17); |
| 1641 |
if (cpu->machine->md.pc.columns <= 40) |
| 1642 |
set_cursor_pos(cpu, 0, 5); |
| 1643 |
else |
| 1644 |
set_cursor_pos(cpu, 0, 4); |
| 1645 |
|
| 1646 |
cpu->machine->md.pc.curcolor = 0x07; |
| 1647 |
|
| 1648 |
/* "Detect" Floppies, IDE disks, and SCSI disks: */ |
| 1649 |
for (i=0; i<4; i++) { |
| 1650 |
if (diskimage_exist(cpu->machine, i, DISKIMAGE_FLOPPY)) { |
| 1651 |
struct pc_bios_disk *p; |
| 1652 |
p = add_disk(cpu->machine, i, i, DISKIMAGE_FLOPPY); |
| 1653 |
snprintf(t, sizeof(t), "%c%c", i<2? ('A'+i):' ', |
| 1654 |
i<2? ':':' '); |
| 1655 |
pc_bios_printstr(cpu, t, 0xf); |
| 1656 |
if (i < 2) |
| 1657 |
nfloppies ++; |
| 1658 |
snprintf(t, sizeof(t), " (bios disk %02x) FLOPPY", i); |
| 1659 |
pc_bios_printstr(cpu, t, cpu->machine->md.pc.curcolor); |
| 1660 |
snprintf(t, sizeof(t), ", %i KB", (int)(p->size/1024)); |
| 1661 |
pc_bios_printstr(cpu, t, cpu->machine->md.pc.curcolor); |
| 1662 |
if (cpu->machine->md.pc.columns <= 40) |
| 1663 |
pc_bios_printstr(cpu, "\n ", 0x07); |
| 1664 |
snprintf(t, sizeof(t), " (CHS=%i,%i,%i)", p->cylinders, |
| 1665 |
p->heads, p->sectorspertrack); |
| 1666 |
pc_bios_printstr(cpu, t, cpu->machine->md.pc.curcolor); |
| 1667 |
if (boot_id == i && boot_type == DISKIMAGE_FLOPPY) { |
| 1668 |
bios_boot_id = i; |
| 1669 |
pc_bios_printstr(cpu, " [boot device]", 0xf); |
| 1670 |
} |
| 1671 |
pc_bios_printstr(cpu, "\n", |
| 1672 |
cpu->machine->md.pc.curcolor); |
| 1673 |
any_disk = 1; |
| 1674 |
} |
| 1675 |
} |
| 1676 |
disknr = 0x80; |
| 1677 |
for (i=0; i<8; i++) { |
| 1678 |
if (diskimage_exist(cpu->machine, i, DISKIMAGE_IDE)) { |
| 1679 |
struct pc_bios_disk *p; |
| 1680 |
p = add_disk(cpu->machine, disknr, i, DISKIMAGE_IDE); |
| 1681 |
snprintf(t, sizeof(t), "%s", disknr==0x80? "C:" : " "); |
| 1682 |
pc_bios_printstr(cpu, t, 0xf); |
| 1683 |
nhds ++; |
| 1684 |
snprintf(t, sizeof(t), |
| 1685 |
" (bios disk %02x) IDE %s, id %i", |
| 1686 |
disknr, diskimage_is_a_cdrom(cpu->machine, i, |
| 1687 |
DISKIMAGE_IDE)? "cdrom" : ( |
| 1688 |
diskimage_is_a_tape(cpu->machine, i, |
| 1689 |
DISKIMAGE_IDE)? "tape" : "disk"), |
| 1690 |
i); |
| 1691 |
pc_bios_printstr(cpu, t, cpu->machine->md.pc.curcolor); |
| 1692 |
if (cpu->machine->md.pc.columns <= 40) |
| 1693 |
pc_bios_printstr(cpu, "\n ", 0x07); |
| 1694 |
else |
| 1695 |
pc_bios_printstr(cpu, ", ", |
| 1696 |
cpu->machine->md.pc.curcolor); |
| 1697 |
snprintf(t, sizeof(t), "%lli MB", (long long) |
| 1698 |
(p->size >> 20)); |
| 1699 |
pc_bios_printstr(cpu, t, cpu->machine->md.pc.curcolor); |
| 1700 |
if (boot_id == i && boot_type == DISKIMAGE_IDE) { |
| 1701 |
bios_boot_id = disknr; |
| 1702 |
pc_bios_printstr(cpu, " [boot device]", 0xf); |
| 1703 |
} |
| 1704 |
pc_bios_printstr(cpu, "\n", |
| 1705 |
cpu->machine->md.pc.curcolor); |
| 1706 |
disknr++; |
| 1707 |
any_disk = 1; |
| 1708 |
} |
| 1709 |
} |
| 1710 |
for (i=0; i<8; i++) { |
| 1711 |
if (diskimage_exist(cpu->machine, i, DISKIMAGE_SCSI)) { |
| 1712 |
struct pc_bios_disk *p; |
| 1713 |
p = add_disk(cpu->machine, disknr, i, DISKIMAGE_SCSI); |
| 1714 |
snprintf(t, sizeof(t), "%s", disknr==0x80? "C:" : " "); |
| 1715 |
pc_bios_printstr(cpu, t, 0xf); |
| 1716 |
nhds ++; |
| 1717 |
snprintf(t, sizeof(t), |
| 1718 |
" (bios disk %02x) SCSI disk, id %i", disknr, i); |
| 1719 |
pc_bios_printstr(cpu, t, cpu->machine->md.pc.curcolor); |
| 1720 |
if (cpu->machine->md.pc.columns <= 40) |
| 1721 |
pc_bios_printstr(cpu, "\n ", 0x07); |
| 1722 |
else |
| 1723 |
pc_bios_printstr(cpu, ", ", |
| 1724 |
cpu->machine->md.pc.curcolor); |
| 1725 |
snprintf(t, sizeof(t), "%lli MB", (long long) |
| 1726 |
(p->size >> 20)); |
| 1727 |
pc_bios_printstr(cpu, t, cpu->machine->md.pc.curcolor); |
| 1728 |
if (boot_id == i && boot_type == DISKIMAGE_SCSI) { |
| 1729 |
bios_boot_id = disknr; |
| 1730 |
pc_bios_printstr(cpu, " [boot device]", 0xf); |
| 1731 |
} |
| 1732 |
pc_bios_printstr(cpu, "\n", |
| 1733 |
cpu->machine->md.pc.curcolor); |
| 1734 |
disknr++; |
| 1735 |
any_disk = 1; |
| 1736 |
} |
| 1737 |
} |
| 1738 |
|
| 1739 |
if (any_disk) |
| 1740 |
pc_bios_printstr(cpu, "\n", cpu->machine->md.pc.curcolor); |
| 1741 |
else |
| 1742 |
pc_bios_printstr(cpu, "No disks attached!\n\n", 0x0f); |
| 1743 |
|
| 1744 |
/* See http://members.tripod.com/~oldboard/assembly/bios_data_area.html |
| 1745 |
for more info. */ |
| 1746 |
if (nfloppies > 0) |
| 1747 |
nfloppies --; |
| 1748 |
|
| 1749 |
reload_segment_descriptor(cpu, X86_S_FS, 0x0000, NULL); |
| 1750 |
store_16bit_word(cpu, 0x400, 0x03F8); /* COM1 */ |
| 1751 |
store_16bit_word(cpu, 0x402, 0x0378); /* COM2 */ |
| 1752 |
store_byte(cpu, 0x410, (nfloppies << 6) | 0x0f); /* nfloppies etc */ |
| 1753 |
store_byte(cpu, 0x411, 2 << 1); /* nserials etc */ |
| 1754 |
store_16bit_word(cpu, 0x413, 640); /* KB of low RAM */ |
| 1755 |
store_byte(cpu, 0x449, cpu->machine->md.pc.videomode); /* video mode */ |
| 1756 |
store_16bit_word(cpu, 0x44a, cpu->machine->md.pc.columns);/* columns */ |
| 1757 |
store_16bit_word(cpu, 0x463, 0x3D4); /* CRT base port */ |
| 1758 |
store_byte(cpu, 0x475, nhds); /* nr of harddisks */ |
| 1759 |
store_byte(cpu, 0x484, cpu->machine->md.pc.rows-1);/* nr of lines-1 */ |
| 1760 |
store_byte(cpu, 0x485, 16); /* font height */ |
| 1761 |
|
| 1762 |
/* Registers passed to the bootsector code: */ |
| 1763 |
reload_segment_descriptor(cpu, X86_S_CS, 0x0000, NULL); |
| 1764 |
reload_segment_descriptor(cpu, X86_S_DS, 0x0000, NULL); |
| 1765 |
reload_segment_descriptor(cpu, X86_S_ES, 0x0000, NULL); |
| 1766 |
reload_segment_descriptor(cpu, X86_S_SS, 0x0000, NULL); |
| 1767 |
|
| 1768 |
cpu->cd.x86.r[X86_R_AX] = 0xaa55; |
| 1769 |
cpu->cd.x86.r[X86_R_CX] = 0x0001; |
| 1770 |
cpu->cd.x86.r[X86_R_DI] = 0xffe4; |
| 1771 |
cpu->cd.x86.r[X86_R_SP] = 0xfffe; |
| 1772 |
cpu->cd.x86.r[X86_R_DX] = bios_boot_id; |
| 1773 |
|
| 1774 |
cpu->cd.x86.rflags |= X86_FLAGS_IF; |
| 1775 |
cpu->pc = 0x7c00; |
| 1776 |
|
| 1777 |
cpu->machine->md.pc.initialized = 1; |
| 1778 |
|
| 1779 |
cpu->cd.x86.cursegment = old_cursegment; |
| 1780 |
} |
| 1781 |
|
| 1782 |
|
| 1783 |
/* |
| 1784 |
* pc_bios_emul(): |
| 1785 |
*/ |
| 1786 |
int pc_bios_emul(struct cpu *cpu) |
| 1787 |
{ |
| 1788 |
uint32_t addr = (cpu->cd.x86.s[X86_S_CS] << 4) + cpu->pc; |
| 1789 |
int int_nr, flags; |
| 1790 |
int enable_ints_after_return = 0; |
| 1791 |
unsigned char w[2]; |
| 1792 |
|
| 1793 |
if (addr == 0xffff0) { |
| 1794 |
fatal("[ bios reboot ]\n"); |
| 1795 |
cpu->running = 0; |
| 1796 |
return 0; |
| 1797 |
} |
| 1798 |
|
| 1799 |
int_nr = (addr >> 4) & 0xff; |
| 1800 |
|
| 1801 |
if (cpu->cd.x86.cr[0] & X86_CR0_PE) { |
| 1802 |
fatal("TODO: BIOS interrupt 0x%02x, but we're not in real-" |
| 1803 |
"mode?\n", int_nr); |
| 1804 |
cpu->running = 0; |
| 1805 |
return 0; |
| 1806 |
} |
| 1807 |
|
| 1808 |
switch (int_nr) { |
| 1809 |
case 0x02: /* NMI? */ |
| 1810 |
debug("[ pc_bios: NMI? TODO ]\n"); |
| 1811 |
break; |
| 1812 |
case 0x08: |
| 1813 |
if (pc_bios_int8(cpu) == 0) |
| 1814 |
return 0; |
| 1815 |
break; |
| 1816 |
case 0x09: pc_bios_int9(cpu); break; |
| 1817 |
case 0x10: pc_bios_int10(cpu); break; |
| 1818 |
case 0x11: |
| 1819 |
/* return bios equipment data in ax */ |
| 1820 |
cpu->memory_rw(cpu, cpu->mem, 0x410, &w[0], sizeof(w), |
| 1821 |
MEM_READ, CACHE_NONE | PHYSICAL); |
| 1822 |
cpu->cd.x86.r[X86_R_AX] &= ~0xffff; |
| 1823 |
cpu->cd.x86.r[X86_R_AX] |= (w[1] << 8) | w[0]; |
| 1824 |
break; |
| 1825 |
case 0x12: /* return memory size in KBs */ |
| 1826 |
cpu->cd.x86.r[X86_R_AX] = 640; |
| 1827 |
break; |
| 1828 |
case 0x13: |
| 1829 |
pc_bios_int13(cpu); |
| 1830 |
enable_ints_after_return = 1; |
| 1831 |
break; |
| 1832 |
case 0x14: pc_bios_int14(cpu); break; |
| 1833 |
case 0x15: pc_bios_int15(cpu); break; |
| 1834 |
case 0x16: |
| 1835 |
if (pc_bios_int16(cpu, &enable_ints_after_return) == 0) { |
| 1836 |
if (enable_ints_after_return) |
| 1837 |
cpu->cd.x86.rflags |= X86_FLAGS_IF; |
| 1838 |
return 0; |
| 1839 |
} |
| 1840 |
break; |
| 1841 |
case 0x17: pc_bios_int17(cpu); break; |
| 1842 |
case 0x18: |
| 1843 |
pc_bios_printstr(cpu, "Disk boot failed. (INT 0x18 called.)\n", |
| 1844 |
0x07); |
| 1845 |
cpu->running = 0; |
| 1846 |
break; |
| 1847 |
case 0x19: |
| 1848 |
pc_bios_printstr(cpu, "Rebooting. (INT 0x19 called.)\n", 0x07); |
| 1849 |
cpu->running = 0; |
| 1850 |
break; |
| 1851 |
case 0x1a: pc_bios_int1a(cpu); break; |
| 1852 |
case 0x1c: pc_bios_int1c(cpu); break; |
| 1853 |
default: |
| 1854 |
fatal("FATAL: Unimplemented PC BIOS interrupt 0x%02x.\n", |
| 1855 |
int_nr); |
| 1856 |
cpu->running = 0; |
| 1857 |
return 0; |
| 1858 |
} |
| 1859 |
|
| 1860 |
/* |
| 1861 |
* Return from the interrupt: Pop ip (pc), cs, and flags. |
| 1862 |
*/ |
| 1863 |
cpu->cd.x86.cursegment = X86_S_SS; |
| 1864 |
cpu->pc = load_16bit_word(cpu, cpu->cd.x86.r[X86_R_SP]); |
| 1865 |
reload_segment_descriptor(cpu, X86_S_CS, |
| 1866 |
load_16bit_word(cpu, cpu->cd.x86.r[X86_R_SP] + 2), NULL); |
| 1867 |
|
| 1868 |
/* Actually, don't pop flags, because they contain result bits |
| 1869 |
from interrupt calls. Only pop the Interrupt Flag. */ |
| 1870 |
flags = load_16bit_word(cpu, cpu->cd.x86.r[X86_R_SP] + 4); |
| 1871 |
cpu->cd.x86.rflags &= ~X86_FLAGS_IF; |
| 1872 |
cpu->cd.x86.rflags |= (flags & X86_FLAGS_IF); |
| 1873 |
|
| 1874 |
if (enable_ints_after_return) |
| 1875 |
cpu->cd.x86.rflags |= X86_FLAGS_IF; |
| 1876 |
|
| 1877 |
cpu->cd.x86.r[X86_R_SP] = (cpu->cd.x86.r[X86_R_SP] & ~0xffff) |
| 1878 |
| ((cpu->cd.x86.r[X86_R_SP] + 6) & 0xffff); |
| 1879 |
|
| 1880 |
return 1; |
| 1881 |
} |
| 1882 |
|
| 1883 |
|
| 1884 |
#endif /* ENABLE_X86 */ |
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