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/* |
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* Copyright (C) 2004-2006 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: dev_vga.c,v 1.95 2006/01/01 13:17:18 debug Exp $ |
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* |
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* VGA charcell and graphics device. |
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* |
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* It should work with 80x25 and 40x25 text modes, and with a few graphics |
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* modes as long as no fancy VGA features are used. |
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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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|
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#include "console.h" |
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#include "cpu.h" |
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#include "devices.h" |
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#include "machine.h" |
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#include "memory.h" |
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#include "misc.h" |
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|
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#include "vga.h" |
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|
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/* These are generated from binary font files: */ |
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#include "fonts/font8x8.c" |
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#include "fonts/font8x10.c" |
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#include "fonts/font8x16.c" |
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|
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|
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/* For videomem -> framebuffer updates: */ |
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#define VGA_TICK_SHIFT 18 |
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|
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#define MAX_RETRACE_SCANLINES 420 |
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#define N_IS1_READ_THRESHOLD 50 |
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|
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#define GFX_ADDR_WINDOW 0x18000 |
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|
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#define VGA_FB_ADDR 0x1c00000000ULL |
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|
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#define MODE_CHARCELL 1 |
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#define MODE_GRAPHICS 2 |
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|
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#define GRAPHICS_MODE_8BIT 1 |
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#define GRAPHICS_MODE_4BIT 2 |
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|
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struct vga_data { |
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uint64_t videomem_base; |
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uint64_t control_base; |
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|
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struct vfb_data *fb; |
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uint32_t fb_size; |
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|
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int fb_max_x; /* pixels */ |
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int fb_max_y; /* pixels */ |
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int max_x; /* charcells or pixels */ |
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int max_y; /* charcells or pixels */ |
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|
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/* Selects charcell mode or graphics mode: */ |
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int cur_mode; |
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|
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/* Common for text and graphics modes: */ |
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int pixel_repx, pixel_repy; |
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|
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/* Textmode: */ |
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int font_width; |
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int font_height; |
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unsigned char *font; |
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size_t charcells_size; |
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unsigned char *charcells; /* 2 bytes per char */ |
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unsigned char *charcells_outputed; /* text */ |
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unsigned char *charcells_drawn; /* framebuffer */ |
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|
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/* Graphics: */ |
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int graphics_mode; |
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int bits_per_pixel; |
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unsigned char *gfx_mem; |
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uint32_t gfx_mem_size; |
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|
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/* Registers: */ |
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int attribute_state; /* 0 or 1 */ |
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unsigned char attribute_reg_select; |
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unsigned char attribute_reg[256]; |
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|
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unsigned char misc_output_reg; |
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|
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unsigned char sequencer_reg_select; |
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unsigned char sequencer_reg[256]; |
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|
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unsigned char graphcontr_reg_select; |
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unsigned char graphcontr_reg[256]; |
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|
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unsigned char crtc_reg_select; |
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unsigned char crtc_reg[256]; |
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|
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unsigned char palette_read_index; |
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char palette_read_subindex; |
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unsigned char palette_write_index; |
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char palette_write_subindex; |
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|
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int current_retrace_line; |
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int input_status_1; |
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|
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/* Palette per scanline during retrace: */ |
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unsigned char *retrace_palette; |
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int use_palette_per_line; |
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int64_t n_is1_reads; |
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|
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/* Misc.: */ |
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int console_handle; |
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|
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int cursor_x; |
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int cursor_y; |
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|
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int modified; |
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int palette_modified; |
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int update_x1; |
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int update_y1; |
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int update_x2; |
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int update_y2; |
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}; |
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|
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|
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/* |
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* recalc_cursor_position(): |
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* |
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* Should be called whenever the cursor location _or_ the display |
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* base has been changed. |
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*/ |
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static void recalc_cursor_position(struct vga_data *d) |
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{ |
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int base = (d->crtc_reg[VGA_CRTC_START_ADDR_HIGH] << 8) |
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+ d->crtc_reg[VGA_CRTC_START_ADDR_LOW]; |
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int ofs = d->crtc_reg[VGA_CRTC_CURSOR_LOCATION_HIGH] * 256 + |
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d->crtc_reg[VGA_CRTC_CURSOR_LOCATION_LOW]; |
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ofs -= base; |
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d->cursor_x = ofs % d->max_x; |
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d->cursor_y = ofs / d->max_x; |
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} |
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|
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|
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/* |
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* register_reset(): |
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* |
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* Resets many registers to sane values. |
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*/ |
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static void register_reset(struct vga_data *d) |
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{ |
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/* Home cursor and start at the top: */ |
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d->crtc_reg[VGA_CRTC_CURSOR_LOCATION_HIGH] = |
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d->crtc_reg[VGA_CRTC_CURSOR_LOCATION_LOW] = 0; |
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d->crtc_reg[VGA_CRTC_START_ADDR_HIGH] = |
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d->crtc_reg[VGA_CRTC_START_ADDR_LOW] = 0; |
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|
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recalc_cursor_position(d); |
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|
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/* Reset cursor scanline stuff: */ |
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d->crtc_reg[VGA_CRTC_CURSOR_SCANLINE_START] = d->font_height - 2; |
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d->crtc_reg[VGA_CRTC_CURSOR_SCANLINE_END] = d->font_height - 1; |
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|
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d->sequencer_reg[VGA_SEQ_MAP_MASK] = 0x0f; |
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d->graphcontr_reg[VGA_GRAPHCONTR_MASK] = 0xff; |
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|
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d->misc_output_reg = VGA_MISC_OUTPUT_IOAS; |
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d->n_is1_reads = 0; |
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} |
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|
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|
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static void c_putstr(struct vga_data *d, char *s) |
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{ |
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while (*s) |
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console_putchar(d->console_handle, *s++); |
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} |
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|
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|
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/* |
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* reset_palette(): |
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*/ |
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static void reset_palette(struct vga_data *d, int grayscale) |
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{ |
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int i, r, g, b; |
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|
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/* TODO: default values for entry 16..255? */ |
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for (i=16; i<256; i++) |
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d->fb->rgb_palette[i*3 + 0] = d->fb->rgb_palette[i*3 + 1] = |
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d->fb->rgb_palette[i*3 + 2] = (i & 15) * 4; |
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d->palette_modified = 1; |
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i = 0; |
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|
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if (grayscale) { |
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for (r=0; r<2; r++) |
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for (g=0; g<2; g++) |
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for (b=0; b<2; b++) { |
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d->fb->rgb_palette[i + 0] = |
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d->fb->rgb_palette[i + 1] = |
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d->fb->rgb_palette[i + 2] = |
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(r+g+b) * 0xaa / 3; |
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d->fb->rgb_palette[i + 8*3 + 0] = |
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d->fb->rgb_palette[i + 8*3 + 1] = |
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d->fb->rgb_palette[i + 8*3 + 2] = |
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(r+g+b) * 0xaa / 3 + 0x55; |
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i+=3; |
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} |
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return; |
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} |
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|
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for (r=0; r<2; r++) |
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for (g=0; g<2; g++) |
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for (b=0; b<2; b++) { |
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d->fb->rgb_palette[i + 0] = r * 0xaa; |
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d->fb->rgb_palette[i + 1] = g * 0xaa; |
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d->fb->rgb_palette[i + 2] = b * 0xaa; |
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i+=3; |
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} |
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for (r=0; r<2; r++) |
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for (g=0; g<2; g++) |
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for (b=0; b<2; b++) { |
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d->fb->rgb_palette[i + 0] = r * 0xaa + 0x55; |
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d->fb->rgb_palette[i + 1] = g * 0xaa + 0x55; |
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d->fb->rgb_palette[i + 2] = b * 0xaa + 0x55; |
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i+=3; |
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} |
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} |
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|
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|
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/* |
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* vga_update_textmode(): |
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* |
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* Called from vga_update() when use_x11 is false. This causes modified |
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* character cells to be "simulated" by outputing ANSI escape sequences |
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* that draw the characters in a terminal window instead. |
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*/ |
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static void vga_update_textmode(struct machine *machine, |
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struct vga_data *d, int base, int start, int end) |
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{ |
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char s[50]; |
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int i, oldcolor = -1, printed_last = 0; |
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|
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for (i=start; i<=end; i+=2) { |
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unsigned char ch = d->charcells[base+i]; |
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int fg = d->charcells[base+i+1] & 15; |
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int bg = (d->charcells[base+i+1] >> 4) & 15; |
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/* top bit of bg = blink */ |
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int x = (i/2) % d->max_x; |
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int y = (i/2) / d->max_x; |
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|
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if (d->charcells[base+i] == d->charcells_outputed[i] && |
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d->charcells[base+i+1] == d->charcells_outputed[i+1]) { |
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printed_last = 0; |
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continue; |
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} |
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|
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d->charcells_outputed[i] = d->charcells[base+i]; |
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d->charcells_outputed[i+1] = d->charcells[base+i+1]; |
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|
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if (!printed_last || x == 0) { |
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snprintf(s, sizeof(s), "\033[%i;%iH", y + 1, x + 1); |
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c_putstr(d, s); |
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} |
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if (oldcolor < 0 || (bg<<4)+fg != oldcolor || !printed_last) { |
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snprintf(s, sizeof(s), "\033[0;"); c_putstr(d, s); |
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|
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switch (fg & 7) { |
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case 0: c_putstr(d, "30"); break; |
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case 1: c_putstr(d, "34"); break; |
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case 2: c_putstr(d, "32"); break; |
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case 3: c_putstr(d, "36"); break; |
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case 4: c_putstr(d, "31"); break; |
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case 5: c_putstr(d, "35"); break; |
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case 6: c_putstr(d, "33"); break; |
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case 7: c_putstr(d, "37"); break; |
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} |
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if (fg & 8) |
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c_putstr(d, ";1"); |
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c_putstr(d, ";"); |
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switch (bg & 7) { |
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case 0: c_putstr(d, "40"); break; |
| 302 |
case 1: c_putstr(d, "44"); break; |
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case 2: c_putstr(d, "42"); break; |
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case 3: c_putstr(d, "46"); break; |
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case 4: c_putstr(d, "41"); break; |
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case 5: c_putstr(d, "45"); break; |
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case 6: c_putstr(d, "43"); break; |
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case 7: c_putstr(d, "47"); break; |
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} |
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/* TODO: blink */ |
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c_putstr(d, "m"); |
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} |
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|
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if (ch >= 0x20 && ch != 127) |
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console_putchar(d->console_handle, ch); |
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|
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oldcolor = (bg << 4) + fg; |
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printed_last = 1; |
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} |
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|
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/* Restore the terminal's cursor position: */ |
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snprintf(s, sizeof(s), "\033[%i;%iH", d->cursor_y + 1, d->cursor_x + 1); |
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c_putstr(d, s); |
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} |
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|
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|
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/* |
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* vga_update_graphics(): |
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* |
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* This function should be called whenever any part of d->gfx_mem[] has |
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* been written to. It will redraw all pixels within the range x1,y1 |
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* .. x2,y2 using the right palette. |
| 333 |
*/ |
| 334 |
static void vga_update_graphics(struct machine *machine, struct vga_data *d, |
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int x1, int y1, int x2, int y2) |
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{ |
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int x, y, ix, iy, c, rx = d->pixel_repx, ry = d->pixel_repy; |
| 338 |
unsigned char pixel[3]; |
| 339 |
|
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for (y=y1; y<=y2; y++) |
| 341 |
for (x=x1; x<=x2; x++) { |
| 342 |
/* addr is where to read from VGA memory, addr2 is |
| 343 |
where to write on the 24-bit framebuffer device */ |
| 344 |
int addr = (y * d->max_x + x) * d->bits_per_pixel; |
| 345 |
switch (d->bits_per_pixel) { |
| 346 |
case 8: addr >>= 3; |
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c = d->gfx_mem[addr]; |
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pixel[0] = d->fb->rgb_palette[c*3+0]; |
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pixel[1] = d->fb->rgb_palette[c*3+1]; |
| 350 |
pixel[2] = d->fb->rgb_palette[c*3+2]; |
| 351 |
break; |
| 352 |
case 4: addr >>= 2; |
| 353 |
if (addr & 1) |
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c = d->gfx_mem[addr >> 1] >> 4; |
| 355 |
else |
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c = d->gfx_mem[addr >> 1] & 0xf; |
| 357 |
pixel[0] = d->fb->rgb_palette[c*3+0]; |
| 358 |
pixel[1] = d->fb->rgb_palette[c*3+1]; |
| 359 |
pixel[2] = d->fb->rgb_palette[c*3+2]; |
| 360 |
break; |
| 361 |
} |
| 362 |
for (iy=y*ry; iy<(y+1)*ry; iy++) |
| 363 |
for (ix=x*rx; ix<(x+1)*rx; ix++) { |
| 364 |
uint32_t addr2 = (d->fb_max_x * iy |
| 365 |
+ ix) * 3; |
| 366 |
if (addr2 < d->fb_size) |
| 367 |
dev_fb_access(machine->cpus[0], |
| 368 |
machine->memory, addr2, |
| 369 |
pixel, sizeof(pixel), |
| 370 |
MEM_WRITE, d->fb); |
| 371 |
} |
| 372 |
} |
| 373 |
} |
| 374 |
|
| 375 |
|
| 376 |
/* |
| 377 |
* vga_update_text(): |
| 378 |
* |
| 379 |
* This function should be called whenever any part of d->charcells[] has |
| 380 |
* been written to. It will redraw all characters within the range x1,y1 |
| 381 |
* .. x2,y2 using the right palette. |
| 382 |
*/ |
| 383 |
static void vga_update_text(struct machine *machine, struct vga_data *d, |
| 384 |
int x1, int y1, int x2, int y2) |
| 385 |
{ |
| 386 |
int fg, bg, x,y, subx, line; |
| 387 |
size_t i, start, end, base; |
| 388 |
int font_size = d->font_height; |
| 389 |
int font_width = d->font_width; |
| 390 |
unsigned char *pal = d->fb->rgb_palette; |
| 391 |
|
| 392 |
if (d->pixel_repx * font_width > 8*8) { |
| 393 |
fatal("[ too large font ]\n"); |
| 394 |
return; |
| 395 |
} |
| 396 |
|
| 397 |
/* Hm... I'm still using the old start..end code: */ |
| 398 |
start = (d->max_x * y1 + x1) * 2; |
| 399 |
end = (d->max_x * y2 + x2) * 2; |
| 400 |
|
| 401 |
start &= ~1; |
| 402 |
end |= 1; |
| 403 |
|
| 404 |
if (end >= d->charcells_size) |
| 405 |
end = d->charcells_size - 1; |
| 406 |
|
| 407 |
base = ((d->crtc_reg[VGA_CRTC_START_ADDR_HIGH] << 8) |
| 408 |
+ d->crtc_reg[VGA_CRTC_START_ADDR_LOW]) * 2; |
| 409 |
|
| 410 |
if (!machine->use_x11) |
| 411 |
vga_update_textmode(machine, d, base, start, end); |
| 412 |
|
| 413 |
for (i=start; i<=end; i+=2) { |
| 414 |
unsigned char ch = d->charcells[i + base]; |
| 415 |
|
| 416 |
if (!d->palette_modified && d->charcells_drawn[i] == ch && |
| 417 |
d->charcells_drawn[i+1] == d->charcells[i+base+1]) |
| 418 |
continue; |
| 419 |
|
| 420 |
d->charcells_drawn[i] = ch; |
| 421 |
d->charcells_drawn[i+1] = d->charcells[i + base + 1]; |
| 422 |
|
| 423 |
fg = d->charcells[i+base + 1] & 15; |
| 424 |
bg = (d->charcells[i+base + 1] >> 4) & 7; |
| 425 |
|
| 426 |
/* Blink is hard to do :-), but inversion might be ok too: */ |
| 427 |
if (d->charcells[i+base + 1] & 128) { |
| 428 |
int tmp = fg; fg = bg; bg = tmp; |
| 429 |
} |
| 430 |
|
| 431 |
x = (i/2) % d->max_x; x *= font_width; |
| 432 |
y = (i/2) / d->max_x; y *= font_size; |
| 433 |
|
| 434 |
/* Draw the character: */ |
| 435 |
for (line = 0; line < font_size; line++) { |
| 436 |
/* hardcoded for max 8 scaleup... :-) */ |
| 437 |
unsigned char rgb_line[3 * 8 * 8]; |
| 438 |
int iy; |
| 439 |
|
| 440 |
for (subx = 0; subx < font_width; subx++) { |
| 441 |
int ix, color_index; |
| 442 |
|
| 443 |
if (d->use_palette_per_line) { |
| 444 |
int sline = d->pixel_repy * (line+y); |
| 445 |
if (sline < MAX_RETRACE_SCANLINES) |
| 446 |
pal = d->retrace_palette |
| 447 |
+ sline * 256*3; |
| 448 |
else |
| 449 |
pal = d->fb->rgb_palette; |
| 450 |
} |
| 451 |
|
| 452 |
if (d->font[ch * font_size + line] & |
| 453 |
(128 >> subx)) |
| 454 |
color_index = fg; |
| 455 |
else |
| 456 |
color_index = bg; |
| 457 |
|
| 458 |
for (ix=0; ix<d->pixel_repx; ix++) |
| 459 |
memcpy(rgb_line + (subx*d->pixel_repx + |
| 460 |
ix) * 3, &pal[color_index * 3], 3); |
| 461 |
} |
| 462 |
|
| 463 |
for (iy=0; iy<d->pixel_repy; iy++) { |
| 464 |
uint32_t addr = (d->fb_max_x * (d->pixel_repy * |
| 465 |
(line+y) + iy) + x * d->pixel_repx) * 3; |
| 466 |
if (addr >= d->fb_size) |
| 467 |
continue; |
| 468 |
dev_fb_access(machine->cpus[0], |
| 469 |
machine->memory, addr, rgb_line, |
| 470 |
3 * font_width, MEM_WRITE, d->fb); |
| 471 |
} |
| 472 |
} |
| 473 |
} |
| 474 |
} |
| 475 |
|
| 476 |
|
| 477 |
/* |
| 478 |
* vga_update_cursor(): |
| 479 |
*/ |
| 480 |
static void vga_update_cursor(struct machine *machine, struct vga_data *d) |
| 481 |
{ |
| 482 |
int onoff = 1, height = d->crtc_reg[VGA_CRTC_CURSOR_SCANLINE_END] |
| 483 |
- d->crtc_reg[VGA_CRTC_CURSOR_SCANLINE_START] + 1; |
| 484 |
|
| 485 |
if (d->cur_mode != MODE_CHARCELL) |
| 486 |
onoff = 0; |
| 487 |
|
| 488 |
if (d->crtc_reg[VGA_CRTC_CURSOR_SCANLINE_START] > |
| 489 |
d->crtc_reg[VGA_CRTC_CURSOR_SCANLINE_END]) { |
| 490 |
onoff = 0; |
| 491 |
height = 1; |
| 492 |
} |
| 493 |
|
| 494 |
if (d->crtc_reg[VGA_CRTC_CURSOR_SCANLINE_START] >= d->font_height) |
| 495 |
onoff = 0; |
| 496 |
|
| 497 |
dev_fb_setcursor(d->fb, |
| 498 |
d->cursor_x * d->font_width * d->pixel_repx, (d->cursor_y * |
| 499 |
d->font_height + d->crtc_reg[VGA_CRTC_CURSOR_SCANLINE_START]) * |
| 500 |
d->pixel_repy, onoff, d->font_width * d->pixel_repx, height * |
| 501 |
d->pixel_repy); |
| 502 |
} |
| 503 |
|
| 504 |
|
| 505 |
/* |
| 506 |
* dev_vga_tick(): |
| 507 |
*/ |
| 508 |
void dev_vga_tick(struct cpu *cpu, void *extra) |
| 509 |
{ |
| 510 |
struct vga_data *d = extra; |
| 511 |
int64_t low = -1, high; |
| 512 |
|
| 513 |
vga_update_cursor(cpu->machine, d); |
| 514 |
|
| 515 |
/* TODO: text vs graphics tick? */ |
| 516 |
memory_device_dyntrans_access(cpu, cpu->mem, extra, |
| 517 |
(uint64_t *) &low, (uint64_t *) &high); |
| 518 |
|
| 519 |
if (low != -1) { |
| 520 |
int base = ((d->crtc_reg[VGA_CRTC_START_ADDR_HIGH] << 8) |
| 521 |
+ d->crtc_reg[VGA_CRTC_START_ADDR_LOW]) * 2; |
| 522 |
int new_u_y1, new_u_y2; |
| 523 |
debug("[ dev_vga_tick: dyntrans access, %llx .. %llx ]\n", |
| 524 |
(long long)low, (long long)high); |
| 525 |
low -= base; |
| 526 |
high -= base; |
| 527 |
d->update_x1 = 0; |
| 528 |
d->update_x2 = d->max_x - 1; |
| 529 |
new_u_y1 = (low/2) / d->max_x; |
| 530 |
new_u_y2 = ((high/2) / d->max_x) + 1; |
| 531 |
if (new_u_y1 < d->update_y1) |
| 532 |
d->update_y1 = new_u_y1; |
| 533 |
if (new_u_y2 > d->update_y2) |
| 534 |
d->update_y2 = new_u_y2; |
| 535 |
if (d->update_y1 < 0) |
| 536 |
d->update_y1 = 0; |
| 537 |
if (d->update_y2 >= d->max_y) |
| 538 |
d->update_y2 = d->max_y - 1; |
| 539 |
d->modified = 1; |
| 540 |
} |
| 541 |
|
| 542 |
if (d->n_is1_reads > N_IS1_READ_THRESHOLD && |
| 543 |
d->retrace_palette != NULL) { |
| 544 |
d->use_palette_per_line = 1; |
| 545 |
d->update_x1 = 0; |
| 546 |
d->update_x2 = d->max_x - 1; |
| 547 |
d->update_y1 = 0; |
| 548 |
d->update_y2 = d->max_y - 1; |
| 549 |
d->modified = 1; |
| 550 |
} else { |
| 551 |
if (d->use_palette_per_line) { |
| 552 |
d->use_palette_per_line = 0; |
| 553 |
d->update_x1 = 0; |
| 554 |
d->update_x2 = d->max_x - 1; |
| 555 |
d->update_y1 = 0; |
| 556 |
d->update_y2 = d->max_y - 1; |
| 557 |
d->modified = 1; |
| 558 |
} |
| 559 |
} |
| 560 |
|
| 561 |
if (!cpu->machine->use_x11) { |
| 562 |
/* NOTE: 2 > 0, so this only updates the cursor, no |
| 563 |
character cells. */ |
| 564 |
vga_update_textmode(cpu->machine, d, 0, 2, 0); |
| 565 |
} |
| 566 |
|
| 567 |
if (d->modified) { |
| 568 |
if (d->cur_mode == MODE_CHARCELL) |
| 569 |
vga_update_text(cpu->machine, d, d->update_x1, |
| 570 |
d->update_y1, d->update_x2, d->update_y2); |
| 571 |
else |
| 572 |
vga_update_graphics(cpu->machine, d, d->update_x1, |
| 573 |
d->update_y1, d->update_x2, d->update_y2); |
| 574 |
|
| 575 |
d->palette_modified = 0; |
| 576 |
d->modified = 0; |
| 577 |
d->update_x1 = 999999; |
| 578 |
d->update_x2 = -1; |
| 579 |
d->update_y1 = 999999; |
| 580 |
d->update_y2 = -1; |
| 581 |
} |
| 582 |
|
| 583 |
if (d->n_is1_reads > N_IS1_READ_THRESHOLD) |
| 584 |
d->n_is1_reads = 0; |
| 585 |
} |
| 586 |
|
| 587 |
|
| 588 |
/* |
| 589 |
* vga_graphics_access(): |
| 590 |
* |
| 591 |
* Reads and writes to the VGA video memory (pixels). |
| 592 |
*/ |
| 593 |
DEVICE_ACCESS(vga_graphics) |
| 594 |
{ |
| 595 |
struct vga_data *d = extra; |
| 596 |
int j, x=0, y=0, x2=0, y2=0, modified = 0; |
| 597 |
size_t i; |
| 598 |
|
| 599 |
if (relative_addr + len >= GFX_ADDR_WINDOW) |
| 600 |
return 0; |
| 601 |
|
| 602 |
if (d->cur_mode != MODE_GRAPHICS) |
| 603 |
return 1; |
| 604 |
|
| 605 |
switch (d->graphics_mode) { |
| 606 |
case GRAPHICS_MODE_8BIT: |
| 607 |
y = relative_addr / d->max_x; |
| 608 |
x = relative_addr % d->max_x; |
| 609 |
y2 = (relative_addr+len-1) / d->max_x; |
| 610 |
x2 = (relative_addr+len-1) % d->max_x; |
| 611 |
|
| 612 |
if (writeflag == MEM_WRITE) { |
| 613 |
memcpy(d->gfx_mem + relative_addr, data, len); |
| 614 |
modified = 1; |
| 615 |
} else |
| 616 |
memcpy(data, d->gfx_mem + relative_addr, len); |
| 617 |
break; |
| 618 |
case GRAPHICS_MODE_4BIT: |
| 619 |
y = relative_addr * 8 / d->max_x; |
| 620 |
x = relative_addr * 8 % d->max_x; |
| 621 |
y2 = ((relative_addr+len)*8-1) / d->max_x; |
| 622 |
x2 = ((relative_addr+len)*8-1) % d->max_x; |
| 623 |
/* TODO: color stuff */ |
| 624 |
|
| 625 |
/* Read/write d->gfx_mem in 4-bit color: */ |
| 626 |
if (writeflag == MEM_WRITE) { |
| 627 |
/* i is byte index to write, j is bit index */ |
| 628 |
for (i=0; i<len; i++) |
| 629 |
for (j=0; j<8; j++) { |
| 630 |
int pixelmask = 1 << (7-j); |
| 631 |
int b = data[i] & pixelmask; |
| 632 |
int m = d->sequencer_reg[ |
| 633 |
VGA_SEQ_MAP_MASK] & 0x0f; |
| 634 |
uint32_t addr = (y * d->max_x + x + |
| 635 |
i*8 + j) * d->bits_per_pixel / 8; |
| 636 |
unsigned char byte; |
| 637 |
if (!(d->graphcontr_reg[ |
| 638 |
VGA_GRAPHCONTR_MASK] & pixelmask)) |
| 639 |
continue; |
| 640 |
if (addr >= d->gfx_mem_size) |
| 641 |
continue; |
| 642 |
byte = d->gfx_mem[addr]; |
| 643 |
if (b && j&1) |
| 644 |
byte |= m << 4; |
| 645 |
if (b && !(j&1)) |
| 646 |
byte |= m; |
| 647 |
if (!b && j&1) |
| 648 |
byte &= ~(m << 4); |
| 649 |
if (!b && !(j&1)) |
| 650 |
byte &= ~m; |
| 651 |
d->gfx_mem[addr] = byte; |
| 652 |
} |
| 653 |
modified = 1; |
| 654 |
} else { |
| 655 |
fatal("TODO: 4 bit graphics read, mask=0x%02x\n", |
| 656 |
d->sequencer_reg[VGA_SEQ_MAP_MASK]); |
| 657 |
for (i=0; i<len; i++) |
| 658 |
data[i] = random(); |
| 659 |
} |
| 660 |
break; |
| 661 |
default:fatal("dev_vga: Unimplemented graphics mode %i\n", |
| 662 |
d->graphics_mode); |
| 663 |
cpu->running = 0; |
| 664 |
} |
| 665 |
|
| 666 |
if (modified) { |
| 667 |
d->modified = 1; |
| 668 |
if (x < d->update_x1) d->update_x1 = x; |
| 669 |
if (x > d->update_x2) d->update_x2 = x; |
| 670 |
if (y < d->update_y1) d->update_y1 = y; |
| 671 |
if (y > d->update_y2) d->update_y2 = y; |
| 672 |
if (x2 < d->update_x1) d->update_x1 = x2; |
| 673 |
if (x2 > d->update_x2) d->update_x2 = x2; |
| 674 |
if (y2 < d->update_y1) d->update_y1 = y2; |
| 675 |
if (y2 > d->update_y2) d->update_y2 = y2; |
| 676 |
if (y != y2) { |
| 677 |
d->update_x1 = 0; |
| 678 |
d->update_x2 = d->max_x - 1; |
| 679 |
} |
| 680 |
} |
| 681 |
return 1; |
| 682 |
} |
| 683 |
|
| 684 |
|
| 685 |
/* |
| 686 |
* dev_vga_access(): |
| 687 |
* |
| 688 |
* Reads and writes to the VGA video memory (charcells). |
| 689 |
*/ |
| 690 |
DEVICE_ACCESS(vga) |
| 691 |
{ |
| 692 |
struct vga_data *d = extra; |
| 693 |
uint64_t idata = 0, odata = 0; |
| 694 |
int x, y, x2, y2, r, base; |
| 695 |
size_t i; |
| 696 |
|
| 697 |
if (writeflag == MEM_WRITE) |
| 698 |
idata = memory_readmax64(cpu, data, len); |
| 699 |
|
| 700 |
base = ((d->crtc_reg[VGA_CRTC_START_ADDR_HIGH] << 8) |
| 701 |
+ d->crtc_reg[VGA_CRTC_START_ADDR_LOW]) * 2; |
| 702 |
r = relative_addr - base; |
| 703 |
y = r / (d->max_x * 2); |
| 704 |
x = (r/2) % d->max_x; |
| 705 |
y2 = (r+len-1) / (d->max_x * 2); |
| 706 |
x2 = ((r+len-1)/2) % d->max_x; |
| 707 |
|
| 708 |
if (relative_addr + len - 1 < d->charcells_size) { |
| 709 |
if (writeflag == MEM_WRITE) { |
| 710 |
for (i=0; i<len; i++) { |
| 711 |
int old = d->charcells[relative_addr + i]; |
| 712 |
if (old != data[i]) { |
| 713 |
d->charcells[relative_addr + i] = |
| 714 |
data[i]; |
| 715 |
d->modified = 1; |
| 716 |
} |
| 717 |
} |
| 718 |
|
| 719 |
if (d->modified) { |
| 720 |
if (x < d->update_x1) d->update_x1 = x; |
| 721 |
if (x > d->update_x2) d->update_x2 = x; |
| 722 |
if (y < d->update_y1) d->update_y1 = y; |
| 723 |
if (y > d->update_y2) d->update_y2 = y; |
| 724 |
if (x2 < d->update_x1) d->update_x1 = x2; |
| 725 |
if (x2 > d->update_x2) d->update_x2 = x2; |
| 726 |
if (y2 < d->update_y1) d->update_y1 = y2; |
| 727 |
if (y2 > d->update_y2) d->update_y2 = y2; |
| 728 |
|
| 729 |
if (y != y2) { |
| 730 |
d->update_x1 = 0; |
| 731 |
d->update_x2 = d->max_x - 1; |
| 732 |
} |
| 733 |
} |
| 734 |
} else |
| 735 |
memcpy(data, d->charcells + relative_addr, len); |
| 736 |
return 1; |
| 737 |
} |
| 738 |
|
| 739 |
switch (relative_addr) { |
| 740 |
default: |
| 741 |
if (writeflag==MEM_READ) { |
| 742 |
debug("[ vga: read from 0x%08lx ]\n", |
| 743 |
(long)relative_addr); |
| 744 |
} else { |
| 745 |
debug("[ vga: write to 0x%08lx: 0x%08x ]\n", |
| 746 |
(long)relative_addr, idata); |
| 747 |
} |
| 748 |
} |
| 749 |
|
| 750 |
if (writeflag == MEM_READ) |
| 751 |
memory_writemax64(cpu, data, len, odata); |
| 752 |
|
| 753 |
return 1; |
| 754 |
} |
| 755 |
|
| 756 |
|
| 757 |
/* |
| 758 |
* vga_crtc_reg_write(): |
| 759 |
* |
| 760 |
* Writes to VGA CRTC registers. |
| 761 |
*/ |
| 762 |
static void vga_crtc_reg_write(struct machine *machine, struct vga_data *d, |
| 763 |
int regnr, int idata) |
| 764 |
{ |
| 765 |
int grayscale; |
| 766 |
|
| 767 |
switch (regnr) { |
| 768 |
case VGA_CRTC_CURSOR_SCANLINE_START: /* 0x0a */ |
| 769 |
case VGA_CRTC_CURSOR_SCANLINE_END: /* 0x0b */ |
| 770 |
break; |
| 771 |
case VGA_CRTC_START_ADDR_HIGH: /* 0x0c */ |
| 772 |
case VGA_CRTC_START_ADDR_LOW: /* 0x0d */ |
| 773 |
d->update_x1 = 0; |
| 774 |
d->update_x2 = d->max_x - 1; |
| 775 |
d->update_y1 = 0; |
| 776 |
d->update_y2 = d->max_y - 1; |
| 777 |
d->modified = 1; |
| 778 |
recalc_cursor_position(d); |
| 779 |
break; |
| 780 |
case VGA_CRTC_CURSOR_LOCATION_HIGH: /* 0x0e */ |
| 781 |
case VGA_CRTC_CURSOR_LOCATION_LOW: /* 0x0f */ |
| 782 |
recalc_cursor_position(d); |
| 783 |
break; |
| 784 |
case 0xff: |
| 785 |
grayscale = 0; |
| 786 |
switch (d->crtc_reg[0xff]) { |
| 787 |
case 0x00: |
| 788 |
grayscale = 1; |
| 789 |
case 0x01: |
| 790 |
d->cur_mode = MODE_CHARCELL; |
| 791 |
d->max_x = 40; d->max_y = 25; |
| 792 |
d->pixel_repx = machine->x11_scaleup * 2; |
| 793 |
d->pixel_repy = machine->x11_scaleup; |
| 794 |
d->font_width = 8; |
| 795 |
d->font_height = 16; |
| 796 |
d->font = font8x16; |
| 797 |
break; |
| 798 |
case 0x02: |
| 799 |
grayscale = 1; |
| 800 |
case 0x03: |
| 801 |
d->cur_mode = MODE_CHARCELL; |
| 802 |
d->max_x = 80; d->max_y = 25; |
| 803 |
d->pixel_repx = d->pixel_repy = machine->x11_scaleup; |
| 804 |
d->font_width = 8; |
| 805 |
d->font_height = 16; |
| 806 |
d->font = font8x16; |
| 807 |
break; |
| 808 |
case 0x08: |
| 809 |
d->cur_mode = MODE_GRAPHICS; |
| 810 |
d->max_x = 160; d->max_y = 200; |
| 811 |
d->graphics_mode = GRAPHICS_MODE_4BIT; |
| 812 |
d->bits_per_pixel = 4; |
| 813 |
d->pixel_repx = 4 * machine->x11_scaleup; |
| 814 |
d->pixel_repy = 2 * machine->x11_scaleup; |
| 815 |
break; |
| 816 |
case 0x09: |
| 817 |
case 0x0d: |
| 818 |
d->cur_mode = MODE_GRAPHICS; |
| 819 |
d->max_x = 320; d->max_y = 200; |
| 820 |
d->graphics_mode = GRAPHICS_MODE_4BIT; |
| 821 |
d->bits_per_pixel = 4; |
| 822 |
d->pixel_repx = d->pixel_repy = |
| 823 |
2 * machine->x11_scaleup; |
| 824 |
break; |
| 825 |
case 0x0e: |
| 826 |
d->cur_mode = MODE_GRAPHICS; |
| 827 |
d->max_x = 640; d->max_y = 200; |
| 828 |
d->graphics_mode = GRAPHICS_MODE_4BIT; |
| 829 |
d->bits_per_pixel = 4; |
| 830 |
d->pixel_repx = machine->x11_scaleup; |
| 831 |
d->pixel_repy = machine->x11_scaleup * 2; |
| 832 |
break; |
| 833 |
case 0x10: |
| 834 |
d->cur_mode = MODE_GRAPHICS; |
| 835 |
d->max_x = 640; d->max_y = 350; |
| 836 |
d->graphics_mode = GRAPHICS_MODE_4BIT; |
| 837 |
d->bits_per_pixel = 4; |
| 838 |
d->pixel_repx = d->pixel_repy = machine->x11_scaleup; |
| 839 |
break; |
| 840 |
case 0x12: |
| 841 |
d->cur_mode = MODE_GRAPHICS; |
| 842 |
d->max_x = 640; d->max_y = 480; |
| 843 |
d->graphics_mode = GRAPHICS_MODE_4BIT; |
| 844 |
d->bits_per_pixel = 4; |
| 845 |
d->pixel_repx = d->pixel_repy = machine->x11_scaleup; |
| 846 |
break; |
| 847 |
case 0x13: |
| 848 |
d->cur_mode = MODE_GRAPHICS; |
| 849 |
d->max_x = 320; d->max_y = 200; |
| 850 |
d->graphics_mode = GRAPHICS_MODE_8BIT; |
| 851 |
d->bits_per_pixel = 8; |
| 852 |
d->pixel_repx = d->pixel_repy = |
| 853 |
2 * machine->x11_scaleup; |
| 854 |
break; |
| 855 |
default: |
| 856 |
fatal("TODO! video mode change hack (mode 0x%02x)\n", |
| 857 |
d->crtc_reg[0xff]); |
| 858 |
exit(1); |
| 859 |
} |
| 860 |
|
| 861 |
if (d->cur_mode == MODE_CHARCELL) { |
| 862 |
dev_fb_resize(d->fb, d->max_x * d->font_width * |
| 863 |
d->pixel_repx, d->max_y * d->font_height * |
| 864 |
d->pixel_repy); |
| 865 |
d->fb_size = d->max_x * d->pixel_repx * d->font_width * |
| 866 |
d->max_y * d->pixel_repy * d->font_height * 3; |
| 867 |
} else { |
| 868 |
dev_fb_resize(d->fb, d->max_x * d->pixel_repx, |
| 869 |
d->max_y * d->pixel_repy); |
| 870 |
d->fb_size = d->max_x * d->pixel_repx * |
| 871 |
d->max_y * d->pixel_repy * 3; |
| 872 |
} |
| 873 |
|
| 874 |
if (d->gfx_mem != NULL) |
| 875 |
free(d->gfx_mem); |
| 876 |
d->gfx_mem_size = 1; |
| 877 |
if (d->cur_mode == MODE_GRAPHICS) |
| 878 |
d->gfx_mem_size = d->max_x * d->max_y / |
| 879 |
(d->graphics_mode == GRAPHICS_MODE_8BIT? 1 : 2); |
| 880 |
d->gfx_mem = malloc(d->gfx_mem_size); |
| 881 |
|
| 882 |
/* Clear screen and reset the palette: */ |
| 883 |
memset(d->charcells_outputed, 0, d->charcells_size); |
| 884 |
memset(d->charcells_drawn, 0, d->charcells_size); |
| 885 |
memset(d->gfx_mem, 0, d->gfx_mem_size); |
| 886 |
d->update_x1 = 0; |
| 887 |
d->update_x2 = d->max_x - 1; |
| 888 |
d->update_y1 = 0; |
| 889 |
d->update_y2 = d->max_y - 1; |
| 890 |
d->modified = 1; |
| 891 |
reset_palette(d, grayscale); |
| 892 |
register_reset(d); |
| 893 |
break; |
| 894 |
default:fatal("[ vga_crtc_reg_write: regnr=0x%02x idata=0x%02x ]\n", |
| 895 |
regnr, idata); |
| 896 |
} |
| 897 |
} |
| 898 |
|
| 899 |
|
| 900 |
/* |
| 901 |
* vga_sequencer_reg_write(): |
| 902 |
* |
| 903 |
* Writes to VGA Sequencer registers. |
| 904 |
*/ |
| 905 |
static void vga_sequencer_reg_write(struct machine *machine, struct vga_data *d, |
| 906 |
int regnr, int idata) |
| 907 |
{ |
| 908 |
switch (regnr) { |
| 909 |
case VGA_SEQ_RESET: |
| 910 |
case VGA_SEQ_MAP_MASK: |
| 911 |
case VGA_SEQ_SEQUENCER_MEMORY_MODE: |
| 912 |
debug("[ vga_sequencer_reg_write: select %i: TODO ]\n", regnr); |
| 913 |
break; |
| 914 |
default:fatal("[ vga_sequencer_reg_write: select %i ]\n", regnr); |
| 915 |
/* cpu->running = 0; */ |
| 916 |
} |
| 917 |
} |
| 918 |
|
| 919 |
|
| 920 |
/* |
| 921 |
* vga_graphcontr_reg_write(): |
| 922 |
* |
| 923 |
* Writes to VGA Graphics Controller registers. |
| 924 |
*/ |
| 925 |
static void vga_graphcontr_reg_write(struct machine *machine, |
| 926 |
struct vga_data *d, int regnr, int idata) |
| 927 |
{ |
| 928 |
switch (regnr) { |
| 929 |
case VGA_GRAPHCONTR_READMAPSELECT: |
| 930 |
case VGA_GRAPHCONTR_GRAPHICSMODE: |
| 931 |
case VGA_GRAPHCONTR_MISC: |
| 932 |
case VGA_GRAPHCONTR_MASK: |
| 933 |
debug("[ vga_graphcontr_reg_write: select %i: TODO ]\n", regnr); |
| 934 |
break; |
| 935 |
default:fatal("[ vga_graphcontr_reg_write: select %i ]\n", regnr); |
| 936 |
/* cpu->running = 0; */ |
| 937 |
} |
| 938 |
} |
| 939 |
|
| 940 |
|
| 941 |
/* |
| 942 |
* vga_attribute_reg_write(): |
| 943 |
* |
| 944 |
* Writes to VGA Attribute registers. |
| 945 |
*/ |
| 946 |
static void vga_attribute_reg_write(struct machine *machine, struct vga_data *d, |
| 947 |
int regnr, int idata) |
| 948 |
{ |
| 949 |
/* 0-15 are palette registers: TODO */ |
| 950 |
if (regnr >= 0 && regnr <= 0xf) |
| 951 |
return; |
| 952 |
|
| 953 |
switch (regnr) { |
| 954 |
default:fatal("[ vga_attribute_reg_write: select %i ]\n", regnr); |
| 955 |
/* cpu->running = 0; */ |
| 956 |
} |
| 957 |
} |
| 958 |
|
| 959 |
|
| 960 |
/* |
| 961 |
* dev_vga_ctrl_access(): |
| 962 |
* |
| 963 |
* Reads and writes of the VGA control registers. |
| 964 |
*/ |
| 965 |
DEVICE_ACCESS(vga_ctrl) |
| 966 |
{ |
| 967 |
struct vga_data *d = extra; |
| 968 |
size_t i; |
| 969 |
uint64_t idata = 0, odata = 0; |
| 970 |
|
| 971 |
for (i=0; i<len; i++) { |
| 972 |
idata = data[i]; |
| 973 |
|
| 974 |
/* 0x3C0 + relative_addr... */ |
| 975 |
|
| 976 |
switch (relative_addr) { |
| 977 |
|
| 978 |
case VGA_ATTRIBUTE_ADDR: /* 0x00 */ |
| 979 |
switch (d->attribute_state) { |
| 980 |
case 0: if (writeflag == MEM_READ) |
| 981 |
odata = d->attribute_reg_select; |
| 982 |
else { |
| 983 |
d->attribute_reg_select = 1; |
| 984 |
d->attribute_state = 1; |
| 985 |
} |
| 986 |
break; |
| 987 |
case 1: d->attribute_state = 0; |
| 988 |
d->attribute_reg[d->attribute_reg_select] = |
| 989 |
idata; |
| 990 |
vga_attribute_reg_write(cpu->machine, d, |
| 991 |
d->attribute_reg_select, idata); |
| 992 |
break; |
| 993 |
} |
| 994 |
break; |
| 995 |
case VGA_ATTRIBUTE_DATA_READ: /* 0x01 */ |
| 996 |
if (writeflag == MEM_WRITE) |
| 997 |
fatal("[ dev_vga: WARNING: Write to " |
| 998 |
"VGA_ATTRIBUTE_DATA_READ? ]\n"); |
| 999 |
else { |
| 1000 |
if (d->attribute_state == 0) |
| 1001 |
fatal("[ dev_vga: WARNING: Read from " |
| 1002 |
"VGA_ATTRIBUTE_DATA_READ, but no" |
| 1003 |
" register selected? ]\n"); |
| 1004 |
else |
| 1005 |
odata = d->attribute_reg[ |
| 1006 |
d->attribute_reg_select]; |
| 1007 |
} |
| 1008 |
break; |
| 1009 |
|
| 1010 |
case VGA_MISC_OUTPUT_W: /* 0x02 */ |
| 1011 |
if (writeflag == MEM_WRITE) |
| 1012 |
d->misc_output_reg = idata; |
| 1013 |
else { |
| 1014 |
/* Reads: Input Status 0 */ |
| 1015 |
odata = 0x00; |
| 1016 |
} |
| 1017 |
break; |
| 1018 |
|
| 1019 |
case VGA_SEQUENCER_ADDR: /* 0x04 */ |
| 1020 |
if (writeflag == MEM_READ) |
| 1021 |
odata = d->sequencer_reg_select; |
| 1022 |
else |
| 1023 |
d->sequencer_reg_select = idata; |
| 1024 |
break; |
| 1025 |
case VGA_SEQUENCER_DATA: /* 0x05 */ |
| 1026 |
if (writeflag == MEM_READ) |
| 1027 |
odata = d->sequencer_reg[ |
| 1028 |
d->sequencer_reg_select]; |
| 1029 |
else { |
| 1030 |
d->sequencer_reg[d-> |
| 1031 |
sequencer_reg_select] = idata; |
| 1032 |
vga_sequencer_reg_write(cpu->machine, d, |
| 1033 |
d->sequencer_reg_select, idata); |
| 1034 |
} |
| 1035 |
break; |
| 1036 |
|
| 1037 |
case VGA_DAC_ADDR_READ: /* 0x07 */ |
| 1038 |
if (writeflag == MEM_WRITE) { |
| 1039 |
d->palette_read_index = idata; |
| 1040 |
d->palette_read_subindex = 0; |
| 1041 |
} else { |
| 1042 |
debug("[ dev_vga: WARNING: Read from " |
| 1043 |
"VGA_DAC_ADDR_READ? TODO ]\n"); |
| 1044 |
/* TODO */ |
| 1045 |
} |
| 1046 |
break; |
| 1047 |
case VGA_DAC_ADDR_WRITE: /* 0x08 */ |
| 1048 |
if (writeflag == MEM_WRITE) { |
| 1049 |
d->palette_write_index = idata; |
| 1050 |
d->palette_write_subindex = 0; |
| 1051 |
|
| 1052 |
/* TODO: Is this correct? */ |
| 1053 |
d->palette_read_index = idata; |
| 1054 |
d->palette_read_subindex = 0; |
| 1055 |
} else { |
| 1056 |
fatal("[ dev_vga: WARNING: Read from " |
| 1057 |
"VGA_DAC_ADDR_WRITE? ]\n"); |
| 1058 |
odata = d->palette_write_index; |
| 1059 |
} |
| 1060 |
break; |
| 1061 |
case VGA_DAC_DATA: /* 0x09 */ |
| 1062 |
if (writeflag == MEM_WRITE) { |
| 1063 |
int new = (idata & 63) << 2; |
| 1064 |
int old = d->fb->rgb_palette[d-> |
| 1065 |
palette_write_index*3+d-> |
| 1066 |
palette_write_subindex]; |
| 1067 |
d->fb->rgb_palette[d->palette_write_index * 3 + |
| 1068 |
d->palette_write_subindex] = new; |
| 1069 |
/* Redraw whole screen, if the |
| 1070 |
palette changed: */ |
| 1071 |
if (new != old) { |
| 1072 |
d->modified = 1; |
| 1073 |
d->palette_modified = 1; |
| 1074 |
d->update_x1 = d->update_y1 = 0; |
| 1075 |
d->update_x2 = d->max_x - 1; |
| 1076 |
d->update_y2 = d->max_y - 1; |
| 1077 |
} |
| 1078 |
d->palette_write_subindex ++; |
| 1079 |
if (d->palette_write_subindex == 3) { |
| 1080 |
d->palette_write_index ++; |
| 1081 |
d->palette_write_subindex = 0; |
| 1082 |
} |
| 1083 |
} else { |
| 1084 |
odata = (d->fb->rgb_palette[d-> |
| 1085 |
palette_read_index * 3 + |
| 1086 |
d->palette_read_subindex] >> 2) & 63; |
| 1087 |
d->palette_read_subindex ++; |
| 1088 |
if (d->palette_read_subindex == 3) { |
| 1089 |
d->palette_read_index ++; |
| 1090 |
d->palette_read_subindex = 0; |
| 1091 |
} |
| 1092 |
} |
| 1093 |
break; |
| 1094 |
|
| 1095 |
case VGA_MISC_OUTPUT_R: |
| 1096 |
odata = d->misc_output_reg; |
| 1097 |
break; |
| 1098 |
|
| 1099 |
case VGA_GRAPHCONTR_ADDR: /* 0x0e */ |
| 1100 |
if (writeflag == MEM_READ) |
| 1101 |
odata = d->graphcontr_reg_select; |
| 1102 |
else |
| 1103 |
d->graphcontr_reg_select = idata; |
| 1104 |
break; |
| 1105 |
case VGA_GRAPHCONTR_DATA: /* 0x0f */ |
| 1106 |
if (writeflag == MEM_READ) |
| 1107 |
odata = d->graphcontr_reg[ |
| 1108 |
d->graphcontr_reg_select]; |
| 1109 |
else { |
| 1110 |
d->graphcontr_reg[d-> |
| 1111 |
graphcontr_reg_select] = idata; |
| 1112 |
vga_graphcontr_reg_write(cpu->machine, d, |
| 1113 |
d->graphcontr_reg_select, idata); |
| 1114 |
} |
| 1115 |
break; |
| 1116 |
|
| 1117 |
case VGA_CRTC_ADDR: /* 0x14 */ |
| 1118 |
if (writeflag == MEM_READ) |
| 1119 |
odata = d->crtc_reg_select; |
| 1120 |
else |
| 1121 |
d->crtc_reg_select = idata; |
| 1122 |
break; |
| 1123 |
case VGA_CRTC_DATA: /* 0x15 */ |
| 1124 |
if (writeflag == MEM_READ) |
| 1125 |
odata = d->crtc_reg[d->crtc_reg_select]; |
| 1126 |
else { |
| 1127 |
d->crtc_reg[d->crtc_reg_select] = idata; |
| 1128 |
vga_crtc_reg_write(cpu->machine, d, |
| 1129 |
d->crtc_reg_select, idata); |
| 1130 |
} |
| 1131 |
break; |
| 1132 |
|
| 1133 |
case VGA_INPUT_STATUS_1: /* 0x1A */ |
| 1134 |
odata = 0; |
| 1135 |
d->n_is1_reads ++; |
| 1136 |
d->current_retrace_line ++; |
| 1137 |
d->current_retrace_line %= (MAX_RETRACE_SCANLINES * 8); |
| 1138 |
/* Whenever we are "inside" a scan line, copy the |
| 1139 |
current palette into retrace_palette[][]: */ |
| 1140 |
if ((d->current_retrace_line & 7) == 7) { |
| 1141 |
if (d->retrace_palette == NULL && |
| 1142 |
d->n_is1_reads > N_IS1_READ_THRESHOLD) { |
| 1143 |
d->retrace_palette = malloc( |
| 1144 |
MAX_RETRACE_SCANLINES * 256*3); |
| 1145 |
if (d->retrace_palette == NULL) { |
| 1146 |
fatal("out of memory\n"); |
| 1147 |
exit(1); |
| 1148 |
} |
| 1149 |
} |
| 1150 |
if (d->retrace_palette != NULL) |
| 1151 |
memcpy(d->retrace_palette + (d-> |
| 1152 |
current_retrace_line >> 3) * 256*3, |
| 1153 |
d->fb->rgb_palette, d->cur_mode == |
| 1154 |
MODE_CHARCELL? (16*3) : (256*3)); |
| 1155 |
} |
| 1156 |
/* These need to go on and off, to fake the |
| 1157 |
real vertical and horizontal retrace info. */ |
| 1158 |
if (d->current_retrace_line < 20*8) |
| 1159 |
odata |= VGA_IS1_DISPLAY_VRETRACE; |
| 1160 |
else { |
| 1161 |
if ((d->current_retrace_line & 7) == 0) |
| 1162 |
odata = VGA_IS1_DISPLAY_DISPLAY_DISABLE; |
| 1163 |
} |
| 1164 |
break; |
| 1165 |
|
| 1166 |
default: |
| 1167 |
if (writeflag==MEM_READ) { |
| 1168 |
debug("[ vga_ctrl: read from 0x%08lx ]\n", |
| 1169 |
(long)relative_addr); |
| 1170 |
} else { |
| 1171 |
debug("[ vga_ctrl: write to 0x%08lx: 0x%08x" |
| 1172 |
" ]\n", (long)relative_addr, (int)idata); |
| 1173 |
} |
| 1174 |
} |
| 1175 |
|
| 1176 |
if (writeflag == MEM_READ) |
| 1177 |
data[i] = odata; |
| 1178 |
|
| 1179 |
/* For multi-byte accesses: */ |
| 1180 |
relative_addr ++; |
| 1181 |
} |
| 1182 |
|
| 1183 |
return 1; |
| 1184 |
} |
| 1185 |
|
| 1186 |
|
| 1187 |
/* |
| 1188 |
* dev_vga_init(): |
| 1189 |
* |
| 1190 |
* Register a VGA text console device. max_x and max_y could be something |
| 1191 |
* like 80 and 25, respectively. |
| 1192 |
*/ |
| 1193 |
void dev_vga_init(struct machine *machine, struct memory *mem, |
| 1194 |
uint64_t videomem_base, uint64_t control_base, char *name) |
| 1195 |
{ |
| 1196 |
struct vga_data *d; |
| 1197 |
size_t i; |
| 1198 |
size_t allocsize; |
| 1199 |
|
| 1200 |
d = malloc(sizeof(struct vga_data)); |
| 1201 |
if (d == NULL) { |
| 1202 |
fprintf(stderr, "out of memory\n"); |
| 1203 |
exit(1); |
| 1204 |
} |
| 1205 |
memset(d, 0, sizeof(struct vga_data)); |
| 1206 |
|
| 1207 |
d->console_handle = console_start_slave(machine, "vga", |
| 1208 |
CONSOLE_OUTPUT_ONLY); |
| 1209 |
|
| 1210 |
d->videomem_base = videomem_base; |
| 1211 |
d->control_base = control_base; |
| 1212 |
d->max_x = 80; |
| 1213 |
d->max_y = 25; |
| 1214 |
d->cur_mode = MODE_CHARCELL; |
| 1215 |
d->crtc_reg[0xff] = 0x03; |
| 1216 |
d->charcells_size = 0x8000; |
| 1217 |
d->gfx_mem_size = 1; /* Nothing, as we start in text mode */ |
| 1218 |
d->pixel_repx = d->pixel_repy = machine->x11_scaleup; |
| 1219 |
|
| 1220 |
/* Allocate in full pages, to make it possible to use bintrans: */ |
| 1221 |
allocsize = ((d->charcells_size-1) | (machine->arch_pagesize-1)) + 1; |
| 1222 |
d->charcells = malloc(d->charcells_size); |
| 1223 |
d->charcells_outputed = malloc(d->charcells_size); |
| 1224 |
d->charcells_drawn = malloc(d->charcells_size); |
| 1225 |
d->gfx_mem = malloc(d->gfx_mem_size); |
| 1226 |
if (d->charcells == NULL || d->charcells_outputed == NULL || |
| 1227 |
d->charcells_drawn == NULL || d->gfx_mem == NULL) { |
| 1228 |
fprintf(stderr, "out of memory in dev_vga_init()\n"); |
| 1229 |
exit(1); |
| 1230 |
} |
| 1231 |
|
| 1232 |
memset(d->charcells_drawn, 0, d->charcells_size); |
| 1233 |
|
| 1234 |
for (i=0; i<d->charcells_size; i+=2) { |
| 1235 |
d->charcells[i] = ' '; |
| 1236 |
d->charcells[i+1] = 0x07; /* Default color */ |
| 1237 |
d->charcells_drawn[i] = ' '; |
| 1238 |
d->charcells_drawn[i+1] = 0x07; |
| 1239 |
} |
| 1240 |
|
| 1241 |
memset(d->charcells_outputed, 0, d->charcells_size); |
| 1242 |
memset(d->gfx_mem, 0, d->gfx_mem_size); |
| 1243 |
|
| 1244 |
d->font = font8x16; |
| 1245 |
d->font_width = 8; |
| 1246 |
d->font_height = 16; |
| 1247 |
|
| 1248 |
d->fb_max_x = d->pixel_repx * d->max_x; |
| 1249 |
d->fb_max_y = d->pixel_repy * d->max_y; |
| 1250 |
if (d->cur_mode == MODE_CHARCELL) { |
| 1251 |
d->fb_max_x *= d->font_width; |
| 1252 |
d->fb_max_y *= d->font_height; |
| 1253 |
} |
| 1254 |
|
| 1255 |
memory_device_register(mem, "vga_charcells", videomem_base + 0x18000, |
| 1256 |
allocsize, dev_vga_access, d, DM_DYNTRANS_OK | |
| 1257 |
DM_DYNTRANS_WRITE_OK | DM_READS_HAVE_NO_SIDE_EFFECTS, |
| 1258 |
d->charcells); |
| 1259 |
memory_device_register(mem, "vga_gfx", videomem_base, GFX_ADDR_WINDOW, |
| 1260 |
dev_vga_graphics_access, d, DM_DEFAULT | |
| 1261 |
DM_READS_HAVE_NO_SIDE_EFFECTS, d->gfx_mem); |
| 1262 |
memory_device_register(mem, "vga_ctrl", control_base, |
| 1263 |
32, dev_vga_ctrl_access, d, DM_DEFAULT, NULL); |
| 1264 |
|
| 1265 |
d->fb = dev_fb_init(machine, mem, VGA_FB_ADDR, VFB_GENERIC, |
| 1266 |
d->fb_max_x, d->fb_max_y, d->fb_max_x, d->fb_max_y, 24, "VGA"); |
| 1267 |
d->fb_size = d->fb_max_x * d->fb_max_y * 3; |
| 1268 |
|
| 1269 |
reset_palette(d, 0); |
| 1270 |
|
| 1271 |
/* This will force an initial redraw/resynch: */ |
| 1272 |
d->update_x1 = 0; |
| 1273 |
d->update_x2 = d->max_x - 1; |
| 1274 |
d->update_y1 = 0; |
| 1275 |
d->update_y2 = d->max_y - 1; |
| 1276 |
d->modified = 1; |
| 1277 |
|
| 1278 |
machine_add_tickfunction(machine, dev_vga_tick, d, VGA_TICK_SHIFT); |
| 1279 |
|
| 1280 |
register_reset(d); |
| 1281 |
|
| 1282 |
vga_update_cursor(machine, d); |
| 1283 |
} |
| 1284 |
|
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