/[gxemul]/trunk/src/pc_bios.c
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Contents of /trunk/src/pc_bios.c

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Revision 4 - (show annotations)
Mon Oct 8 16:18:00 2007 UTC (16 years, 6 months ago) by dpavlin
File MIME type: text/plain
File size: 5409 byte(s) 
++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.707 2005/04/27 16:37:33 debug Exp $
20050408	Some minor updates to the wdc. Linux now doesn't complain
		anymore if a disk is non-present.
20050409	Various minor fixes (a bintrans bug, and some other things).
		The wdc seems to work with Playstation2 emulation, but there
		is a _long_ annoying delay when disks are detected.
		Fixing a really important bintrans bug (when devices and RAM
		are mixed within 4KB pages), which was triggered with
		NetBSD/playstation2 kernels.
20050410	Adding a dummy dev_ps2_ether (just so that NetBSD doesn't
		complain as much during bootup).
		Symbols starting with '$' are now ignored.
		Renaming dev_ps2_ohci.c to dev_ohci.c, etc.
20050411	Moving the bintrans-cache-isolation check from cpu_mips.c to
		cpu_mips_coproc.c. (I thought this would give a speedup, but
		it's not noticable.)
		Better playstation2 sbus interrupt code.
		Skip ahead many ticks if the count register is read manually.
		(This increases the speed of delay-loops that simply read
		the count register.)
20050412	Updates to the playstation2 timer/interrupt code.
		Some other minor updates.
20050413	NetBSD/cobalt runs from a disk image :-) including userland;
		updating the documentation on how to install NetBSD/cobalt
		using NetBSD/pmax (!).
		Some minor bintrans updates (no real speed improvement) and
		other minor updates (playstation2 now uses the -o options).
20050414	Adding a dummy x86 (and AMD64) mode.
20050415	Adding some (32-bit and 16-bit) x86 instructions.
		Adding some initial support for non-SCSI, non-IDE floppy
		images. (The x86 mode can boot from these, more or less.)
		Moving the devices/ and include/ directories to src/devices/
		and src/include/, respectively.
20050416	Continuing on the x86 stuff. (Adding pc_bios.c and some simple
		support for software interrupts in 16-bit mode.)
20050417	Ripping out most of the x86 instruction decoding stuff, trying
		to rewrite it in a cleaner way.
		Disabling some of the least working CPU families in the
		configure script (sparc, x86, alpha, hppa), so that they are
		not enabled by default.
20050418	Trying to fix the bug which caused problems when turning on
		and off bintrans interactively, by flushing the bintrans cache
		whenever bintrans is manually (re)enabled.
20050419	Adding the 'lswi' ppc instruction.
		Minor updates to the x86 instruction decoding.
20050420	Renaming x86 register name indices from R_xx to X86_R_xx (this
		makes building on Tru64 nicer).
20050422	Adding a check for duplicate MIPS TLB entries on tlbwr/tlbwi.
20050427	Adding screenshots to guestoses.html.
		Some minor fixes and testing for the next release.

==============  RELEASE 0.3.2  ==============
1 /*
2 * Copyright (C) 2005 Anders Gavare. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. The name of the author may not be used to endorse or promote products
13 * derived from this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 *
28 * $Id: pc_bios.c,v 1.5 2005/04/20 02:05:56 debug Exp $
29 *
30 * Generic PC BIOS emulation.
31 */
32
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36
37 #include "console.h"
38 #include "cpu.h"
39 #include "cpu_x86.h"
40 #include "machine.h"
41 #include "memory.h"
42 #include "misc.h"
43
44
45 extern int quiet_mode;
46
47
48 /*
49 * output_char():
50 */
51 static void output_char(struct cpu *cpu, int x, int y, int ch, int color)
52 {
53 uint64_t addr = (y * 80 + x) * 2;
54 unsigned char w[2];
55
56 w[0] = ch; w[1] = color;
57 cpu->cd.x86.cursegment = 0xb800;
58 cpu->memory_rw(cpu, cpu->mem, addr, &w[0], sizeof(w), MEM_WRITE,
59 CACHE_NONE | PHYSICAL);
60 }
61
62
63 /*
64 * set_cursor_pos():
65 */
66 static void set_cursor_pos(struct cpu *cpu, int x, int y)
67 {
68 int addr = y * 80 + x;
69 unsigned char byte;
70 uint64_t ctrlregs = 0x1000003c0ULL;
71
72 byte = 0x0e;
73 cpu->memory_rw(cpu, cpu->mem, ctrlregs + 0x14,
74 &byte, sizeof(byte), MEM_WRITE, CACHE_NONE | PHYSICAL);
75 byte = (addr >> 8) & 255;
76 cpu->memory_rw(cpu, cpu->mem, ctrlregs + 0x15,
77 &byte, sizeof(byte), MEM_WRITE, CACHE_NONE | PHYSICAL);
78 byte = 0x0f;
79 cpu->memory_rw(cpu, cpu->mem, ctrlregs + 0x14,
80 &byte, sizeof(byte), MEM_WRITE, CACHE_NONE | PHYSICAL);
81 byte = addr & 255;
82 cpu->memory_rw(cpu, cpu->mem, ctrlregs + 0x15,
83 &byte, sizeof(byte), MEM_WRITE, CACHE_NONE | PHYSICAL);
84 }
85
86
87 /*
88 * pc_bios_int10():
89 *
90 * Video functions.
91 */
92 static void pc_bios_int10(struct cpu *cpu)
93 {
94 int x,y;
95 int ah = (cpu->cd.x86.r[X86_R_AX] >> 8) & 0xff;
96 int al = cpu->cd.x86.r[X86_R_AX] & 0xff;
97
98 switch (ah) {
99 case 0x00: /* Switch video mode. */
100 switch (al) {
101 case 0x03: /* 80x25 color textmode */
102 /* Simply clear the screen and home the cursor
103 for now. TODO: More advanced stuff. */
104 set_cursor_pos(cpu, 0, 0);
105 for (y=0; y<25; y++)
106 for (x=0; x<80; x++)
107 output_char(cpu, x,y, ' ', 0x07);
108 break;
109 default:
110 fatal("pc_bios_int10(): unimplemented video mode "
111 "0x%02x\n", al);
112 cpu->running = 0;
113 cpu->dead = 1;
114 }
115 break;
116 default:
117 fatal("FATAL: Unimplemented PC BIOS interrupt 0x10 function"
118 " 0x%02x.\n", ah);
119 cpu->running = 0;
120 cpu->dead = 1;
121 }
122 }
123
124
125 /*
126 * pc_bios_int13():
127 *
128 * Disk-related functions.
129 */
130 static void pc_bios_int13(struct cpu *cpu)
131 {
132 int ah = (cpu->cd.x86.r[X86_R_AX] >> 8) & 0xff;
133
134 switch (ah) {
135 case 0x00: /* Reset disk, dl = drive */
136 /* Do nothing. :-) */
137 break;
138 default:
139 fatal("FATAL: Unimplemented PC BIOS interrupt 0x1a function"
140 " 0x%02x.\n", ah);
141 cpu->running = 0;
142 cpu->dead = 1;
143 }
144 }
145
146
147 /*
148 * pc_bios_int1a():
149 *
150 * Time of Day stuff.
151 */
152 static void pc_bios_int1a(struct cpu *cpu)
153 {
154 int ah = (cpu->cd.x86.r[X86_R_AX] >> 8) & 0xff;
155
156 switch (ah) {
157 case 0x00:
158 /* Return tick count? TODO */
159 cpu->cd.x86.r[X86_R_CX] = 0;
160 cpu->cd.x86.r[X86_R_DX] = 0;
161 break;
162 default:
163 fatal("FATAL: Unimplemented PC BIOS interrupt 0x1a function"
164 " 0x%02x.\n", ah);
165 cpu->running = 0;
166 cpu->dead = 1;
167 }
168 }
169
170
171 /*
172 * pc_bios_emul():
173 */
174 int pc_bios_emul(struct cpu *cpu)
175 {
176 uint32_t addr = (cpu->cd.x86.s[X86_S_CS] << 4) + cpu->pc;
177 int int_nr;
178
179 int_nr = addr & 0xfff;
180
181 switch (int_nr) {
182 case 0x10:
183 pc_bios_int10(cpu);
184 break;
185 case 0x13:
186 pc_bios_int13(cpu);
187 break;
188 case 0x1a:
189 pc_bios_int1a(cpu);
190 break;
191 default:
192 fatal("FATAL: Unimplemented PC BIOS interrupt 0x%02x.\n",
193 int_nr);
194 cpu->running = 0;
195 cpu->dead = 1;
196 }
197
198 /*
199 * Return from the interrupt: Pop ip (pc), cs, and flags.
200 */
201 cpu->cd.x86.cursegment = cpu->cd.x86.s[X86_S_SS];
202 cpu->pc = load_16bit_word(cpu, cpu->cd.x86.r[X86_R_SP]);
203 cpu->cd.x86.s[X86_S_CS] =
204 load_16bit_word(cpu, cpu->cd.x86.r[X86_R_SP] + 2);
205 cpu->cd.x86.rflags = (cpu->cd.x86.rflags & ~0xffff)
206 | load_16bit_word(cpu, cpu->cd.x86.r[X86_R_SP] + 4);
207
208 cpu->cd.x86.r[X86_R_SP] = (cpu->cd.x86.r[X86_R_SP] & ~0xffff)
209 | ((cpu->cd.x86.r[X86_R_SP] + 6) & 0xffff);
210
211 return 1;
212 }
213
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