mirror of https://gitee.com/openkylin/qemu.git
1376 lines
37 KiB
C
1376 lines
37 KiB
C
/*
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* QEMU VGA Emulator. An S3 86c968 is emulated
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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#include <getopt.h>
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#include <inttypes.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <time.h>
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#include <sys/time.h>
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#include <malloc.h>
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#include <termios.h>
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#include <sys/poll.h>
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#include <errno.h>
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#include <sys/wait.h>
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#include <netinet/in.h>
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#include "cpu-i386.h"
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#include "exec.h"
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#include "vl.h"
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#define NO_THUNK_TYPE_SIZE
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#include "thunk.h"
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//#define DEBUG_VGA
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//#define DEBUG_VGA_MEM
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#define MSR_COLOR_EMULATION 0x01
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#define MSR_PAGE_SELECT 0x20
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#define ST01_V_RETRACE 0x08
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#define ST01_DISP_ENABLE 0x01
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typedef struct VGAState {
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uint8_t *vram_ptr;
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unsigned long vram_offset;
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unsigned int vram_size;
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uint32_t latch;
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uint8_t sr_index;
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uint8_t sr[8];
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uint8_t gr_index;
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uint8_t gr[16];
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uint8_t ar_index;
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uint8_t ar[21];
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int ar_flip_flop;
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uint8_t cr_index;
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uint8_t cr[256]; /* CRT registers */
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uint8_t msr; /* Misc Output Register */
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uint8_t fcr; /* Feature Control Register */
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uint8_t st00; /* status 0 */
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uint8_t st01; /* status 1 */
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uint8_t dac_state;
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uint8_t dac_sub_index;
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uint8_t dac_read_index;
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uint8_t dac_write_index;
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uint8_t dac_cache[3]; /* used when writing */
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uint8_t palette[768];
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/* display refresh support */
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DisplayState *ds;
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uint32_t font_offsets[2];
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int graphic_mode;
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uint8_t shift_control;
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uint8_t double_scan;
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uint32_t line_offset;
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uint32_t line_compare;
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uint32_t start_addr;
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uint8_t last_cw, last_ch;
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uint32_t last_width, last_height;
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uint8_t cursor_start, cursor_end;
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uint32_t cursor_offset;
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unsigned int (*rgb_to_pixel)(unsigned int r, unsigned int g, unsigned b);
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/* tell for each page if it has been updated since the last time */
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uint8_t vram_updated[VGA_RAM_SIZE / 4096];
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uint32_t last_palette[256];
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#define CH_ATTR_SIZE (160 * 100)
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uint32_t last_ch_attr[CH_ATTR_SIZE]; /* XXX: make it dynamic */
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} VGAState;
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/* force some bits to zero */
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static const uint8_t sr_mask[8] = {
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(uint8_t)~0xfc,
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(uint8_t)~0xc2,
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(uint8_t)~0xf0,
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(uint8_t)~0xc0,
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(uint8_t)~0xf1,
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(uint8_t)~0xff,
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(uint8_t)~0xff,
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(uint8_t)~0x00,
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};
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static const uint8_t gr_mask[16] = {
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(uint8_t)~0xf0, /* 0x00 */
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(uint8_t)~0xf0, /* 0x01 */
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(uint8_t)~0xf0, /* 0x02 */
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(uint8_t)~0xe0, /* 0x03 */
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(uint8_t)~0xfc, /* 0x04 */
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(uint8_t)~0x84, /* 0x05 */
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(uint8_t)~0xf0, /* 0x06 */
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(uint8_t)~0xf0, /* 0x07 */
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(uint8_t)~0x00, /* 0x08 */
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(uint8_t)~0xff, /* 0x09 */
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(uint8_t)~0xff, /* 0x0a */
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(uint8_t)~0xff, /* 0x0b */
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(uint8_t)~0xff, /* 0x0c */
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(uint8_t)~0xff, /* 0x0d */
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(uint8_t)~0xff, /* 0x0e */
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(uint8_t)~0xff, /* 0x0f */
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};
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#define cbswap_32(__x) \
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((uint32_t)( \
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(((uint32_t)(__x) & (uint32_t)0x000000ffUL) << 24) | \
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(((uint32_t)(__x) & (uint32_t)0x0000ff00UL) << 8) | \
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(((uint32_t)(__x) & (uint32_t)0x00ff0000UL) >> 8) | \
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(((uint32_t)(__x) & (uint32_t)0xff000000UL) >> 24) ))
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#ifdef WORD_BIGENDIAN
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#define PAT(x) cbswap_32(x)
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#else
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#define PAT(x) (x)
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#endif
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static const uint32_t mask16[16] = {
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PAT(0x00000000),
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PAT(0x000000ff),
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PAT(0x0000ff00),
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PAT(0x0000ffff),
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PAT(0x00ff0000),
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PAT(0x00ff00ff),
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PAT(0x00ffff00),
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PAT(0x00ffffff),
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PAT(0xff000000),
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PAT(0xff0000ff),
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PAT(0xff00ff00),
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PAT(0xff00ffff),
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PAT(0xffff0000),
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PAT(0xffff00ff),
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PAT(0xffffff00),
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PAT(0xffffffff),
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};
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#undef PAT
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#ifdef WORD_BIGENDIAN
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#define PAT(x) (x)
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#else
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#define PAT(x) cbswap_32(x)
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#endif
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static const uint32_t dmask16[16] = {
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PAT(0x00000000),
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PAT(0x000000ff),
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PAT(0x0000ff00),
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PAT(0x0000ffff),
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PAT(0x00ff0000),
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PAT(0x00ff00ff),
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PAT(0x00ffff00),
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PAT(0x00ffffff),
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PAT(0xff000000),
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PAT(0xff0000ff),
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PAT(0xff00ff00),
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PAT(0xff00ffff),
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PAT(0xffff0000),
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PAT(0xffff00ff),
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PAT(0xffffff00),
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PAT(0xffffffff),
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};
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static const uint32_t dmask4[4] = {
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PAT(0x00000000),
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PAT(0x0000ffff),
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PAT(0xffff0000),
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PAT(0xffffffff),
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};
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static uint32_t expand4[256];
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static uint16_t expand2[256];
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static uint8_t expand4to8[16];
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VGAState vga_state;
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int vga_io_memory;
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static uint32_t vga_ioport_read(CPUX86State *env, uint32_t addr)
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{
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VGAState *s = &vga_state;
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int val, index;
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/* check port range access depending on color/monochrome mode */
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if ((addr >= 0x3b0 && addr <= 0x3bf && (s->msr & MSR_COLOR_EMULATION)) ||
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(addr >= 0x3d0 && addr <= 0x3df && !(s->msr & MSR_COLOR_EMULATION))) {
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val = 0xff;
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} else {
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switch(addr) {
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case 0x3c0:
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if (s->ar_flip_flop == 0) {
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val = s->ar_index;
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} else {
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val = 0;
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}
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break;
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case 0x3c1:
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index = s->ar_index & 0x1f;
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if (index < 21)
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val = s->ar[index];
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else
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val = 0;
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break;
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case 0x3c2:
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val = s->st00;
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break;
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case 0x3c4:
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val = s->sr_index;
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break;
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case 0x3c5:
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val = s->sr[s->sr_index];
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break;
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case 0x3c7:
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val = s->dac_state;
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break;
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case 0x3c9:
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val = s->palette[s->dac_read_index * 3 + s->dac_sub_index];
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if (++s->dac_sub_index == 3) {
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s->dac_sub_index = 0;
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s->dac_read_index++;
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}
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break;
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case 0x3ca:
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val = s->fcr;
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break;
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case 0x3cc:
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val = s->msr;
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break;
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case 0x3ce:
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val = s->gr_index;
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break;
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case 0x3cf:
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val = s->gr[s->gr_index];
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break;
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case 0x3b4:
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case 0x3d4:
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val = s->cr_index;
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break;
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case 0x3b5:
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case 0x3d5:
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val = s->cr[s->cr_index];
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break;
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case 0x3ba:
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case 0x3da:
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/* just toggle to fool polling */
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s->st01 ^= ST01_V_RETRACE | ST01_DISP_ENABLE;
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val = s->st01;
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s->ar_flip_flop = 0;
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break;
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default:
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val = 0x00;
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break;
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}
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}
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#ifdef DEBUG_VGA
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printf("VGA: read addr=0x%04x data=0x%02x\n", addr, val);
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#endif
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return val;
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}
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static void vga_ioport_write(CPUX86State *env, uint32_t addr, uint32_t val)
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{
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VGAState *s = &vga_state;
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int index, v;
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/* check port range access depending on color/monochrome mode */
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if ((addr >= 0x3b0 && addr <= 0x3bf && (s->msr & MSR_COLOR_EMULATION)) ||
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(addr >= 0x3d0 && addr <= 0x3df && !(s->msr & MSR_COLOR_EMULATION)))
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return;
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#ifdef DEBUG_VGA
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printf("VGA: write addr=0x%04x data=0x%02x\n", addr, val);
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#endif
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switch(addr) {
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case 0x3c0:
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if (s->ar_flip_flop == 0) {
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val &= 0x3f;
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s->ar_index = val;
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} else {
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index = s->ar_index & 0x1f;
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switch(index) {
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case 0x00 ... 0x0f:
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s->ar[index] = val & 0x3f;
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break;
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case 0x10:
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s->ar[index] = val & ~0x10;
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break;
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case 0x11:
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s->ar[index] = val;
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break;
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case 0x12:
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s->ar[index] = val & ~0xc0;
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break;
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case 0x13:
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s->ar[index] = val & ~0xf0;
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break;
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case 0x14:
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s->ar[index] = val & ~0xf0;
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break;
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default:
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break;
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}
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}
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s->ar_flip_flop ^= 1;
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break;
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case 0x3c2:
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s->msr = val & ~0x10;
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break;
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case 0x3c4:
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s->sr_index = val & 7;
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break;
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case 0x3c5:
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s->sr[s->sr_index] = val & sr_mask[s->sr_index];
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break;
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case 0x3c7:
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s->dac_read_index = val;
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s->dac_sub_index = 0;
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s->dac_state = 3;
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break;
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case 0x3c8:
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s->dac_write_index = val;
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s->dac_sub_index = 0;
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s->dac_state = 0;
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break;
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case 0x3c9:
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s->dac_cache[s->dac_sub_index] = val;
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if (++s->dac_sub_index == 3) {
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memcpy(&s->palette[s->dac_write_index * 3], s->dac_cache, 3);
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s->dac_sub_index = 0;
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s->dac_write_index++;
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}
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break;
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case 0x3ce:
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s->gr_index = val & 0x0f;
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break;
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case 0x3cf:
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s->gr[s->gr_index] = val & gr_mask[s->gr_index];
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break;
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case 0x3b4:
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case 0x3d4:
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s->cr_index = val;
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break;
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case 0x3b5:
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case 0x3d5:
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/* handle CR0-7 protection */
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if ((s->cr[11] & 0x80) && s->cr_index <= 7) {
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/* can always write bit 4 of CR7 */
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if (s->cr_index == 7)
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s->cr[7] = (s->cr[7] & ~0x10) | (val & 0x10);
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return;
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}
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switch(s->cr_index) {
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case 0x01: /* horizontal display end */
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case 0x07:
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case 0x09:
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case 0x0c:
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case 0x0d:
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case 0x12: /* veritcal display end */
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s->cr[s->cr_index] = val;
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break;
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/* S3 registers */
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case 0x2d:
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case 0x2e:
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case 0x2f:
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case 0x30:
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/* chip ID, cannot write */
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break;
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case 0x31:
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/* update start address */
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s->cr[s->cr_index] = val;
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v = (val >> 4) & 3;
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s->cr[0x69] = (s->cr[69] & ~0x03) | v;
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break;
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case 0x51:
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/* update start address */
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s->cr[s->cr_index] = val;
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v = val & 3;
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s->cr[0x69] = (s->cr[69] & ~0x0c) | (v << 2);
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break;
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default:
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s->cr[s->cr_index] = val;
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break;
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}
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break;
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case 0x3ba:
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case 0x3da:
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s->fcr = val & 0x10;
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break;
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}
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}
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/* called for accesses between 0xa0000 and 0xc0000 */
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static uint32_t vga_mem_readb(uint32_t addr)
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{
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VGAState *s = &vga_state;
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int memory_map_mode, plane;
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uint32_t ret;
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/* convert to VGA memory offset */
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memory_map_mode = (s->gr[6] >> 2) & 3;
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switch(memory_map_mode) {
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case 0:
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addr -= 0xa0000;
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break;
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case 1:
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addr -= 0xa0000;
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if (addr >= 0x10000)
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return 0xff;
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break;
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case 2:
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addr -= 0xb0000;
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if (addr >= 0x8000)
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return 0xff;
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break;
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default:
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case 3:
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addr -= 0xb8000;
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break;
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}
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if (s->sr[4] & 0x08) {
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/* chain 4 mode : simplest access */
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ret = s->vram_ptr[addr];
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} else if (s->gr[5] & 0x10) {
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/* odd/even mode (aka text mode mapping) */
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plane = (s->gr[4] & 2) | (addr & 1);
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ret = s->vram_ptr[((addr & ~1) << 1) | plane];
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} else {
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/* standard VGA latched access */
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s->latch = ((uint32_t *)s->vram_ptr)[addr];
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if (!(s->gr[5] & 0x08)) {
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/* read mode 0 */
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plane = s->gr[4];
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#ifdef WORD_BIGENDIAN
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ret = (s->latch >> (24 - (plane * 8))) & 0xff;
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#else
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ret = (s->latch >> (plane * 8)) & 0xff;
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#endif
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} else {
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/* read mode 1 */
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ret = (s->latch ^ mask16[s->gr[2]]) & mask16[s->gr[7]];
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ret |= ret >> 16;
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ret |= ret >> 8;
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ret = (~ret) & 0xff;
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}
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}
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return ret;
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}
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static uint32_t vga_mem_readw(uint32_t addr)
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{
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uint32_t v;
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v = vga_mem_readb(addr);
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v |= vga_mem_readb(addr + 1) << 8;
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return v;
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}
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static uint32_t vga_mem_readl(uint32_t addr)
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{
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uint32_t v;
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v = vga_mem_readb(addr);
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v |= vga_mem_readb(addr + 1) << 8;
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v |= vga_mem_readb(addr + 2) << 16;
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v |= vga_mem_readb(addr + 3) << 24;
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return v;
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}
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/* called for accesses between 0xa0000 and 0xc0000 */
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void vga_mem_writeb(uint32_t addr, uint32_t val)
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{
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VGAState *s = &vga_state;
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|
int memory_map_mode, plane, write_mode, b, func_select;
|
|
uint32_t write_mask, bit_mask, set_mask;
|
|
|
|
#ifdef DEBUG_VGA_MEM
|
|
printf("vga: [0x%x] = 0x%02x\n", addr, val);
|
|
#endif
|
|
/* convert to VGA memory offset */
|
|
memory_map_mode = (s->gr[6] >> 2) & 3;
|
|
switch(memory_map_mode) {
|
|
case 0:
|
|
addr -= 0xa0000;
|
|
break;
|
|
case 1:
|
|
addr -= 0xa0000;
|
|
if (addr >= 0x10000)
|
|
return;
|
|
break;
|
|
case 2:
|
|
addr -= 0xb0000;
|
|
if (addr >= 0x8000)
|
|
return;
|
|
break;
|
|
default:
|
|
case 3:
|
|
addr -= 0xb8000;
|
|
break;
|
|
}
|
|
|
|
if (s->sr[4] & 0x08) {
|
|
/* chain 4 mode : simplest access */
|
|
plane = addr & 3;
|
|
if (s->sr[2] & (1 << plane)) {
|
|
s->vram_ptr[addr] = val;
|
|
#ifdef DEBUG_VGA_MEM
|
|
printf("vga: chain4: [0x%x]\n", addr);
|
|
#endif
|
|
s->vram_updated[addr >> 12] = 1;
|
|
}
|
|
} else if (s->gr[5] & 0x10) {
|
|
/* odd/even mode (aka text mode mapping) */
|
|
plane = (s->gr[4] & 2) | (addr & 1);
|
|
if (s->sr[2] & (1 << plane)) {
|
|
addr = ((addr & ~1) << 1) | plane;
|
|
s->vram_ptr[addr] = val;
|
|
#ifdef DEBUG_VGA_MEM
|
|
printf("vga: odd/even: [0x%x]\n", addr);
|
|
#endif
|
|
s->vram_updated[addr >> 12] = 1;
|
|
}
|
|
} else {
|
|
/* standard VGA latched access */
|
|
write_mode = s->gr[5] & 3;
|
|
switch(write_mode) {
|
|
default:
|
|
case 0:
|
|
/* rotate */
|
|
b = s->gr[3] & 7;
|
|
val = ((val >> b) | (val << (8 - b))) & 0xff;
|
|
val |= val << 8;
|
|
val |= val << 16;
|
|
|
|
/* apply set/reset mask */
|
|
set_mask = mask16[s->gr[1]];
|
|
val = (val & ~set_mask) | (mask16[s->gr[0]] & set_mask);
|
|
bit_mask = s->gr[8];
|
|
break;
|
|
case 1:
|
|
val = s->latch;
|
|
goto do_write;
|
|
case 2:
|
|
val = mask16[val & 0x0f];
|
|
bit_mask = s->gr[8];
|
|
break;
|
|
case 3:
|
|
/* rotate */
|
|
b = s->gr[3] & 7;
|
|
val = ((val >> b) | (val << (8 - b)));
|
|
|
|
bit_mask = s->gr[8] & val;
|
|
val = mask16[s->gr[0]];
|
|
break;
|
|
}
|
|
|
|
/* apply logical operation */
|
|
func_select = s->gr[3] >> 3;
|
|
switch(func_select) {
|
|
case 0:
|
|
default:
|
|
/* nothing to do */
|
|
break;
|
|
case 1:
|
|
/* and */
|
|
val &= s->latch;
|
|
break;
|
|
case 2:
|
|
/* or */
|
|
val |= s->latch;
|
|
break;
|
|
case 3:
|
|
/* xor */
|
|
val ^= s->latch;
|
|
break;
|
|
}
|
|
|
|
/* apply bit mask */
|
|
bit_mask |= bit_mask << 8;
|
|
bit_mask |= bit_mask << 16;
|
|
val = (val & bit_mask) | (s->latch & ~bit_mask);
|
|
|
|
do_write:
|
|
/* mask data according to sr[2] */
|
|
write_mask = mask16[s->sr[2]];
|
|
((uint32_t *)s->vram_ptr)[addr] =
|
|
(((uint32_t *)s->vram_ptr)[addr] & ~write_mask) |
|
|
(val & write_mask);
|
|
#ifdef DEBUG_VGA_MEM
|
|
printf("vga: latch: [0x%x] mask=0x%08x val=0x%08x\n",
|
|
addr * 4, write_mask, val);
|
|
#endif
|
|
s->vram_updated[addr >> 10] = 1;
|
|
}
|
|
}
|
|
|
|
void vga_mem_writew(uint32_t addr, uint32_t val)
|
|
{
|
|
vga_mem_writeb(addr, val & 0xff);
|
|
vga_mem_writeb(addr + 1, (val >> 8) & 0xff);
|
|
}
|
|
|
|
void vga_mem_writel(uint32_t addr, uint32_t val)
|
|
{
|
|
vga_mem_writeb(addr, val & 0xff);
|
|
vga_mem_writeb(addr + 1, (val >> 8) & 0xff);
|
|
vga_mem_writeb(addr + 2, (val >> 16) & 0xff);
|
|
vga_mem_writeb(addr + 3, (val >> 24) & 0xff);
|
|
}
|
|
|
|
#ifdef WORD_BIGENDIAN
|
|
#define BIG 1
|
|
#else
|
|
#define BIG 0
|
|
#endif
|
|
|
|
#ifdef WORDS_BIGENDIAN
|
|
#define GET_PLANE(data, p) (((data) >> (24 - (p) * 8)) & 0xff)
|
|
#else
|
|
#define GET_PLANE(data, p) (((data) >> ((p) * 8)) & 0xff)
|
|
#endif
|
|
|
|
typedef void vga_draw_glyph8_func(uint8_t *d, int linesize,
|
|
const uint8_t *font_ptr, int h,
|
|
uint32_t fgcol, uint32_t bgcol);
|
|
typedef void vga_draw_glyph9_func(uint8_t *d, int linesize,
|
|
const uint8_t *font_ptr, int h,
|
|
uint32_t fgcol, uint32_t bgcol, int dup9);
|
|
typedef void vga_draw_line_func(VGAState *s1, uint8_t *d,
|
|
const uint8_t *s, int width);
|
|
|
|
static inline unsigned int rgb_to_pixel8(unsigned int r, unsigned int g, unsigned b)
|
|
{
|
|
/* XXX: TODO */
|
|
return 0;
|
|
}
|
|
|
|
static inline unsigned int rgb_to_pixel15(unsigned int r, unsigned int g, unsigned b)
|
|
{
|
|
return ((r >> 3) << 10) | ((g >> 3) << 5) | (b >> 3);
|
|
}
|
|
|
|
static inline unsigned int rgb_to_pixel16(unsigned int r, unsigned int g, unsigned b)
|
|
{
|
|
return ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3);
|
|
}
|
|
|
|
static inline unsigned int rgb_to_pixel32(unsigned int r, unsigned int g, unsigned b)
|
|
{
|
|
return (r << 16) | (g << 8) | b;
|
|
}
|
|
|
|
#define DEPTH 8
|
|
#include "vga_template.h"
|
|
|
|
#define DEPTH 15
|
|
#include "vga_template.h"
|
|
|
|
#define DEPTH 16
|
|
#include "vga_template.h"
|
|
|
|
#define DEPTH 32
|
|
#include "vga_template.h"
|
|
|
|
static inline int c6_to_8(int v)
|
|
{
|
|
int b;
|
|
v &= 0x3f;
|
|
b = v & 1;
|
|
return (v << 2) | (b << 1) | b;
|
|
}
|
|
|
|
static unsigned int rgb_to_pixel8_dup(unsigned int r, unsigned int g, unsigned b)
|
|
{
|
|
unsigned int col;
|
|
col = rgb_to_pixel8(r, g, b);
|
|
col |= col << 8;
|
|
col |= col << 16;
|
|
return col;
|
|
}
|
|
|
|
static unsigned int rgb_to_pixel15_dup(unsigned int r, unsigned int g, unsigned b)
|
|
{
|
|
unsigned int col;
|
|
col = rgb_to_pixel15(r, g, b);
|
|
col |= col << 16;
|
|
return col;
|
|
}
|
|
|
|
static unsigned int rgb_to_pixel16_dup(unsigned int r, unsigned int g, unsigned b)
|
|
{
|
|
unsigned int col;
|
|
col = rgb_to_pixel16(r, g, b);
|
|
col |= col << 16;
|
|
return col;
|
|
}
|
|
|
|
static unsigned int rgb_to_pixel32_dup(unsigned int r, unsigned int g, unsigned b)
|
|
{
|
|
unsigned int col;
|
|
col = rgb_to_pixel32(r, g, b);
|
|
return col;
|
|
}
|
|
|
|
/* return true if the palette was modified */
|
|
static int update_palette16(VGAState *s)
|
|
{
|
|
int full_update, i;
|
|
uint32_t v, col, *palette;
|
|
|
|
full_update = 0;
|
|
palette = s->last_palette;
|
|
for(i = 0; i < 16; i++) {
|
|
v = s->ar[i];
|
|
if (s->ar[0x10] & 0x80)
|
|
v = ((s->ar[0x14] & 0xf) << 4) | (v & 0xf);
|
|
else
|
|
v = ((s->ar[0x14] & 0xc) << 4) | (v & 0x3f);
|
|
v = v * 3;
|
|
col = s->rgb_to_pixel(c6_to_8(s->palette[v]),
|
|
c6_to_8(s->palette[v + 1]),
|
|
c6_to_8(s->palette[v + 2]));
|
|
if (col != palette[i]) {
|
|
full_update = 1;
|
|
palette[i] = col;
|
|
}
|
|
}
|
|
return full_update;
|
|
}
|
|
|
|
/* return true if the palette was modified */
|
|
static int update_palette256(VGAState *s)
|
|
{
|
|
int full_update, i;
|
|
uint32_t v, col, *palette;
|
|
|
|
full_update = 0;
|
|
palette = s->last_palette;
|
|
v = 0;
|
|
for(i = 0; i < 256; i++) {
|
|
col = s->rgb_to_pixel(c6_to_8(s->palette[v]),
|
|
c6_to_8(s->palette[v + 1]),
|
|
c6_to_8(s->palette[v + 2]));
|
|
if (col != palette[i]) {
|
|
full_update = 1;
|
|
palette[i] = col;
|
|
}
|
|
v += 3;
|
|
}
|
|
return full_update;
|
|
}
|
|
|
|
/* update start_addr and line_offset. Return TRUE if modified */
|
|
static int update_basic_params(VGAState *s)
|
|
{
|
|
int full_update;
|
|
uint32_t start_addr, line_offset, line_compare, v;
|
|
|
|
full_update = 0;
|
|
/* compute line_offset in bytes */
|
|
v = (s->cr[0x51] >> 4) & 3; /* S3 extension */
|
|
if (v == 0)
|
|
v = (s->cr[0x43] >> 2) & 1; /* S3 extension */
|
|
line_offset = s->cr[0x13] | (v << 8);
|
|
line_offset <<= 3;
|
|
|
|
/* starting address */
|
|
start_addr = s->cr[0x0d] | (s->cr[0x0c] << 8);
|
|
start_addr |= (s->cr[0x69] & 0x1f) << 16; /* S3 extension */
|
|
|
|
/* line compare */
|
|
line_compare = s->cr[0x18] |
|
|
((s->cr[0x07] & 0x10) << 4) |
|
|
((s->cr[0x09] & 0x40) << 3);
|
|
|
|
if (line_offset != s->line_offset ||
|
|
start_addr != s->start_addr ||
|
|
line_compare != s->line_compare) {
|
|
s->line_offset = line_offset;
|
|
s->start_addr = start_addr;
|
|
s->line_compare = line_compare;
|
|
full_update = 1;
|
|
}
|
|
return full_update;
|
|
}
|
|
|
|
static inline int get_depth_index(int depth)
|
|
{
|
|
switch(depth) {
|
|
default:
|
|
case 8:
|
|
return 0;
|
|
case 15:
|
|
return 1;
|
|
case 16:
|
|
return 2;
|
|
case 32:
|
|
return 3;
|
|
}
|
|
}
|
|
|
|
static vga_draw_glyph8_func *vga_draw_glyph8_table[4] = {
|
|
vga_draw_glyph8_8,
|
|
vga_draw_glyph8_16,
|
|
vga_draw_glyph8_16,
|
|
vga_draw_glyph8_32,
|
|
};
|
|
|
|
static vga_draw_glyph8_func *vga_draw_glyph16_table[4] = {
|
|
vga_draw_glyph16_8,
|
|
vga_draw_glyph16_16,
|
|
vga_draw_glyph16_16,
|
|
vga_draw_glyph16_32,
|
|
};
|
|
|
|
static vga_draw_glyph9_func *vga_draw_glyph9_table[4] = {
|
|
vga_draw_glyph9_8,
|
|
vga_draw_glyph9_16,
|
|
vga_draw_glyph9_16,
|
|
vga_draw_glyph9_32,
|
|
};
|
|
|
|
static const uint8_t cursor_glyph[32 * 4] = {
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
};
|
|
|
|
/*
|
|
* Text mode update
|
|
* Missing:
|
|
* - double scan
|
|
* - double width
|
|
* - underline
|
|
* - flashing
|
|
*/
|
|
static void vga_draw_text(VGAState *s, int full_update)
|
|
{
|
|
int cx, cy, cheight, cw, ch, cattr, height, width, ch_attr;
|
|
int cx_min, cx_max, linesize, x_incr;
|
|
uint32_t offset, fgcol, bgcol, v, cursor_offset;
|
|
uint8_t *d1, *d, *src, *s1, *dest, *cursor_ptr;
|
|
const uint8_t *font_ptr, *font_base[2];
|
|
int dup9, line_offset, depth_index;
|
|
uint32_t *palette;
|
|
uint32_t *ch_attr_ptr;
|
|
vga_draw_glyph8_func *vga_draw_glyph8;
|
|
vga_draw_glyph9_func *vga_draw_glyph9;
|
|
|
|
full_update |= update_palette16(s);
|
|
palette = s->last_palette;
|
|
|
|
/* compute font data address (in plane 2) */
|
|
v = s->sr[3];
|
|
offset = (((v >> 5) & 1) | ((v >> 1) & 6)) * 8192 * 4 + 2;
|
|
if (offset != s->font_offsets[0]) {
|
|
s->font_offsets[0] = offset;
|
|
full_update = 1;
|
|
}
|
|
font_base[0] = s->vram_ptr + offset;
|
|
|
|
offset = (((v >> 4) & 1) | ((v << 1) & 6)) * 8192 * 4 + 2;
|
|
font_base[1] = s->vram_ptr + offset;
|
|
if (offset != s->font_offsets[1]) {
|
|
s->font_offsets[1] = offset;
|
|
full_update = 1;
|
|
}
|
|
|
|
full_update |= update_basic_params(s);
|
|
|
|
line_offset = s->line_offset;
|
|
s1 = s->vram_ptr + (s->start_addr * 4);
|
|
|
|
/* total width & height */
|
|
cheight = (s->cr[9] & 0x1f) + 1;
|
|
cw = 8;
|
|
if (s->sr[1] & 0x01)
|
|
cw = 9;
|
|
if (s->sr[1] & 0x08)
|
|
cw = 16; /* NOTE: no 18 pixel wide */
|
|
x_incr = cw * ((s->ds->depth + 7) >> 3);
|
|
width = (s->cr[0x01] + 1);
|
|
if (s->cr[0x06] == 100) {
|
|
/* ugly hack for CGA 160x100x16 - explain me the logic */
|
|
height = 100;
|
|
} else {
|
|
height = s->cr[0x12] |
|
|
((s->cr[0x07] & 0x02) << 7) |
|
|
((s->cr[0x07] & 0x40) << 3);
|
|
height = (height + 1) / cheight;
|
|
}
|
|
if (width != s->last_width || height != s->last_height ||
|
|
cw != s->last_cw || cw != s->last_cw) {
|
|
dpy_resize(s->ds, width * cw, height * cheight);
|
|
s->last_width = width;
|
|
s->last_height = height;
|
|
s->last_ch = cheight;
|
|
s->last_cw = cw;
|
|
full_update = 1;
|
|
}
|
|
cursor_offset = ((s->cr[0x0e] << 8) | s->cr[0x0f]) - s->start_addr;
|
|
if (cursor_offset != s->cursor_offset ||
|
|
s->cr[0xa] != s->cursor_start ||
|
|
s->cr[0xb] != s->cursor_end) {
|
|
/* if the cursor position changed, we update the old and new
|
|
chars */
|
|
if (s->cursor_offset < CH_ATTR_SIZE)
|
|
s->last_ch_attr[s->cursor_offset] = -1;
|
|
if (cursor_offset < CH_ATTR_SIZE)
|
|
s->last_ch_attr[cursor_offset] = -1;
|
|
s->cursor_offset = cursor_offset;
|
|
s->cursor_start = s->cr[0xa];
|
|
s->cursor_end = s->cr[0xb];
|
|
}
|
|
cursor_ptr = s->vram_ptr + (s->start_addr + cursor_offset) * 4;
|
|
|
|
depth_index = get_depth_index(s->ds->depth);
|
|
if (cw == 16)
|
|
vga_draw_glyph8 = vga_draw_glyph16_table[depth_index];
|
|
else
|
|
vga_draw_glyph8 = vga_draw_glyph8_table[depth_index];
|
|
vga_draw_glyph9 = vga_draw_glyph9_table[depth_index];
|
|
|
|
dest = s->ds->data;
|
|
linesize = s->ds->linesize;
|
|
ch_attr_ptr = s->last_ch_attr;
|
|
for(cy = 0; cy < height; cy++) {
|
|
d1 = dest;
|
|
src = s1;
|
|
cx_min = width;
|
|
cx_max = -1;
|
|
for(cx = 0; cx < width; cx++) {
|
|
ch_attr = *(uint16_t *)src;
|
|
if (full_update || ch_attr != *ch_attr_ptr) {
|
|
if (cx < cx_min)
|
|
cx_min = cx;
|
|
if (cx > cx_max)
|
|
cx_max = cx;
|
|
*ch_attr_ptr = ch_attr;
|
|
#ifdef WORDS_BIGENDIAN
|
|
ch = ch_attr >> 8;
|
|
cattr = ch_attr & 0xff;
|
|
#else
|
|
ch = ch_attr & 0xff;
|
|
cattr = ch_attr >> 8;
|
|
#endif
|
|
font_ptr = font_base[(cattr >> 3) & 1];
|
|
font_ptr += 32 * 4 * ch;
|
|
bgcol = palette[cattr >> 4];
|
|
fgcol = palette[cattr & 0x0f];
|
|
if (cw != 9) {
|
|
vga_draw_glyph8(d1, linesize,
|
|
font_ptr, cheight, fgcol, bgcol);
|
|
} else {
|
|
dup9 = 0;
|
|
if (ch >= 0xb0 && ch <= 0xdf && (s->ar[0x10] & 0x04))
|
|
dup9 = 1;
|
|
vga_draw_glyph9(d1, linesize,
|
|
font_ptr, cheight, fgcol, bgcol, dup9);
|
|
}
|
|
if (src == cursor_ptr &&
|
|
!(s->cr[0x0a] & 0x20)) {
|
|
int line_start, line_last, h;
|
|
/* draw the cursor */
|
|
line_start = s->cr[0x0a] & 0x1f;
|
|
line_last = s->cr[0x0b] & 0x1f;
|
|
/* XXX: check that */
|
|
if (line_last > cheight - 1)
|
|
line_last = cheight - 1;
|
|
if (line_last >= line_start && line_start < cheight) {
|
|
h = line_last - line_start + 1;
|
|
d = d1 + linesize * line_start;
|
|
if (cw != 9) {
|
|
vga_draw_glyph8(d, linesize,
|
|
cursor_glyph, h, fgcol, bgcol);
|
|
} else {
|
|
vga_draw_glyph9(d, linesize,
|
|
cursor_glyph, h, fgcol, bgcol, 1);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
d1 += x_incr;
|
|
src += 4;
|
|
ch_attr_ptr++;
|
|
}
|
|
if (cx_max != -1) {
|
|
dpy_update(s->ds, cx_min * cw, cy * cheight,
|
|
(cx_max - cx_min + 1) * cw, cheight);
|
|
}
|
|
dest += linesize * cheight;
|
|
s1 += line_offset;
|
|
}
|
|
}
|
|
|
|
enum {
|
|
VGA_DRAW_LINE2,
|
|
VGA_DRAW_LINE2D2,
|
|
VGA_DRAW_LINE4,
|
|
VGA_DRAW_LINE4D2,
|
|
VGA_DRAW_LINE8D2,
|
|
VGA_DRAW_LINE8,
|
|
VGA_DRAW_LINE15,
|
|
VGA_DRAW_LINE16,
|
|
VGA_DRAW_LINE32,
|
|
VGA_DRAW_LINE_NB,
|
|
};
|
|
|
|
static vga_draw_line_func *vga_draw_line_table[4 * VGA_DRAW_LINE_NB] = {
|
|
vga_draw_line2_8,
|
|
vga_draw_line2_16,
|
|
vga_draw_line2_16,
|
|
vga_draw_line2_32,
|
|
|
|
vga_draw_line2d2_8,
|
|
vga_draw_line2d2_16,
|
|
vga_draw_line2d2_16,
|
|
vga_draw_line2d2_32,
|
|
|
|
vga_draw_line4_8,
|
|
vga_draw_line4_16,
|
|
vga_draw_line4_16,
|
|
vga_draw_line4_32,
|
|
|
|
vga_draw_line4d2_8,
|
|
vga_draw_line4d2_16,
|
|
vga_draw_line4d2_16,
|
|
vga_draw_line4d2_32,
|
|
|
|
vga_draw_line8d2_8,
|
|
vga_draw_line8d2_16,
|
|
vga_draw_line8d2_16,
|
|
vga_draw_line8d2_32,
|
|
|
|
vga_draw_line8_8,
|
|
vga_draw_line8_16,
|
|
vga_draw_line8_16,
|
|
vga_draw_line8_32,
|
|
|
|
vga_draw_line15_8,
|
|
vga_draw_line15_15,
|
|
vga_draw_line15_16,
|
|
vga_draw_line15_32,
|
|
|
|
vga_draw_line16_8,
|
|
vga_draw_line16_15,
|
|
vga_draw_line16_16,
|
|
vga_draw_line16_32,
|
|
|
|
vga_draw_line32_8,
|
|
vga_draw_line32_15,
|
|
vga_draw_line32_16,
|
|
vga_draw_line32_32,
|
|
};
|
|
|
|
/*
|
|
* graphic modes
|
|
* Missing:
|
|
* - double scan
|
|
* - double width
|
|
*/
|
|
static void vga_draw_graphic(VGAState *s, int full_update)
|
|
{
|
|
int y1, y, update, page_min, page_max, linesize, y_start, double_scan, mask;
|
|
int width, height, shift_control, line_offset, page0, page1, bwidth;
|
|
int disp_width;
|
|
uint8_t *d;
|
|
uint32_t v, addr1, addr;
|
|
vga_draw_line_func *vga_draw_line;
|
|
|
|
full_update |= update_basic_params(s);
|
|
|
|
width = (s->cr[0x01] + 1) * 8;
|
|
height = s->cr[0x12] |
|
|
((s->cr[0x07] & 0x02) << 7) |
|
|
((s->cr[0x07] & 0x40) << 3);
|
|
height = (height + 1);
|
|
disp_width = width;
|
|
|
|
shift_control = (s->gr[0x05] >> 5) & 3;
|
|
double_scan = (s->cr[0x09] & 0x80);
|
|
if (shift_control != s->shift_control ||
|
|
double_scan != s->double_scan) {
|
|
full_update = 1;
|
|
s->shift_control = shift_control;
|
|
s->double_scan = double_scan;
|
|
}
|
|
|
|
if (shift_control == 0) {
|
|
full_update |= update_palette16(s);
|
|
if (s->sr[0x01] & 8) {
|
|
v = VGA_DRAW_LINE4D2;
|
|
disp_width <<= 1;
|
|
} else {
|
|
v = VGA_DRAW_LINE4;
|
|
}
|
|
} else if (shift_control == 1) {
|
|
full_update |= update_palette16(s);
|
|
if (s->sr[0x01] & 8) {
|
|
v = VGA_DRAW_LINE2D2;
|
|
disp_width <<= 1;
|
|
} else {
|
|
v = VGA_DRAW_LINE2;
|
|
}
|
|
} else {
|
|
full_update |= update_palette256(s);
|
|
v = VGA_DRAW_LINE8D2;
|
|
double_scan = 1; /* XXX: explain me why it is always activated */
|
|
}
|
|
vga_draw_line = vga_draw_line_table[v * 4 + get_depth_index(s->ds->depth)];
|
|
|
|
if (disp_width != s->last_width ||
|
|
height != s->last_height) {
|
|
dpy_resize(s->ds, disp_width, height);
|
|
s->last_width = disp_width;
|
|
s->last_height = height;
|
|
full_update = 1;
|
|
}
|
|
|
|
line_offset = s->line_offset;
|
|
#if 0
|
|
printf("w=%d h=%d v=%d line_offset=%d double_scan=0x%02x cr[0x17]=0x%02x linecmp=%d sr[0x01]=%02x\n",
|
|
width, height, v, line_offset, s->cr[9], s->cr[0x17], s->line_compare, s->sr[0x01]);
|
|
#endif
|
|
addr1 = (s->start_addr * 4);
|
|
bwidth = width * 4;
|
|
y_start = -1;
|
|
page_min = 0x7fffffff;
|
|
page_max = -1;
|
|
d = s->ds->data;
|
|
linesize = s->ds->linesize;
|
|
y1 = 0;
|
|
for(y = 0; y < height; y++) {
|
|
addr = addr1;
|
|
if (!(s->cr[0x17] & 1)) {
|
|
int shift;
|
|
/* CGA compatibility handling */
|
|
shift = 14 + ((s->cr[0x17] >> 6) & 1);
|
|
addr = (addr & ~(1 << shift)) | ((y1 & 1) << shift);
|
|
}
|
|
if (!(s->cr[0x17] & 2)) {
|
|
addr = (addr & ~0x8000) | ((y1 & 2) << 14);
|
|
}
|
|
page0 = addr >> 12;
|
|
page1 = (addr + bwidth - 1) >> 12;
|
|
update = full_update | s->vram_updated[page0] | s->vram_updated[page1];
|
|
if ((page1 - page0) > 1) {
|
|
/* if wide line, can use another page */
|
|
update |= s->vram_updated[page0 + 1];
|
|
}
|
|
if (update) {
|
|
if (y_start < 0)
|
|
y_start = y;
|
|
if (page0 < page_min)
|
|
page_min = page0;
|
|
if (page1 > page_max)
|
|
page_max = page1;
|
|
vga_draw_line(s, d, s->vram_ptr + addr, width);
|
|
} else {
|
|
if (y_start >= 0) {
|
|
/* flush to display */
|
|
dpy_update(s->ds, 0, y_start,
|
|
disp_width, y - y_start);
|
|
y_start = -1;
|
|
}
|
|
}
|
|
if (!double_scan || (y & 1) != 0) {
|
|
if (y1 == s->line_compare) {
|
|
addr1 = 0;
|
|
} else {
|
|
mask = (s->cr[0x17] & 3) ^ 3;
|
|
if ((y1 & mask) == mask)
|
|
addr1 += line_offset;
|
|
}
|
|
y1++;
|
|
}
|
|
d += linesize;
|
|
}
|
|
if (y_start >= 0) {
|
|
/* flush to display */
|
|
dpy_update(s->ds, 0, y_start,
|
|
disp_width, y - y_start);
|
|
}
|
|
/* reset modified pages */
|
|
if (page_max != -1) {
|
|
memset(s->vram_updated + page_min, 0, page_max - page_min + 1);
|
|
}
|
|
}
|
|
|
|
/* draw text terminal (very limited, just for simple boot debug
|
|
messages) */
|
|
static int last_cursor_pos;
|
|
|
|
void vga_draw_dumb(VGAState *s)
|
|
{
|
|
int c, i, cursor_pos, eol;
|
|
|
|
cursor_pos = s->cr[0x0f] | (s->cr[0x0e] << 8);
|
|
eol = 0;
|
|
for(i = last_cursor_pos; i < cursor_pos; i++) {
|
|
/* XXX: should use vga RAM */
|
|
c = phys_ram_base[0xb8000 + (i) * 2];
|
|
if (c >= ' ') {
|
|
putchar(c);
|
|
eol = 0;
|
|
} else {
|
|
if (!eol)
|
|
putchar('\n');
|
|
eol = 1;
|
|
}
|
|
}
|
|
fflush(stdout);
|
|
last_cursor_pos = cursor_pos;
|
|
}
|
|
|
|
void vga_update_display(void)
|
|
{
|
|
VGAState *s = &vga_state;
|
|
int full_update, graphic_mode;
|
|
|
|
if (s->ds->depth == 0) {
|
|
vga_draw_dumb(s);
|
|
} else {
|
|
full_update = 0;
|
|
graphic_mode = s->gr[6] & 1;
|
|
if (graphic_mode != s->graphic_mode) {
|
|
s->graphic_mode = graphic_mode;
|
|
full_update = 1;
|
|
}
|
|
if (graphic_mode)
|
|
vga_draw_graphic(s, full_update);
|
|
else
|
|
vga_draw_text(s, full_update);
|
|
}
|
|
}
|
|
|
|
void vga_reset(VGAState *s)
|
|
{
|
|
memset(s, 0, sizeof(VGAState));
|
|
/* chip ID for 8c968 */
|
|
s->cr[0x2d] = 0x88;
|
|
s->cr[0x2e] = 0xb0;
|
|
s->cr[0x2f] = 0x01; /* XXX: check revision code */
|
|
s->cr[0x30] = 0xe1;
|
|
s->graphic_mode = -1; /* force full update */
|
|
}
|
|
|
|
CPUReadMemoryFunc *vga_mem_read[3] = {
|
|
vga_mem_readb,
|
|
vga_mem_readw,
|
|
vga_mem_readl,
|
|
};
|
|
|
|
CPUWriteMemoryFunc *vga_mem_write[3] = {
|
|
vga_mem_writeb,
|
|
vga_mem_writew,
|
|
vga_mem_writel,
|
|
};
|
|
|
|
int vga_init(DisplayState *ds, uint8_t *vga_ram_base,
|
|
unsigned long vga_ram_offset, int vga_ram_size)
|
|
{
|
|
VGAState *s = &vga_state;
|
|
int i, j, v, b;
|
|
|
|
for(i = 0;i < 256; i++) {
|
|
v = 0;
|
|
for(j = 0; j < 8; j++) {
|
|
v |= ((i >> j) & 1) << (j * 4);
|
|
}
|
|
expand4[i] = v;
|
|
|
|
v = 0;
|
|
for(j = 0; j < 4; j++) {
|
|
v |= ((i >> (2 * j)) & 3) << (j * 4);
|
|
}
|
|
expand2[i] = v;
|
|
}
|
|
for(i = 0; i < 16; i++) {
|
|
v = 0;
|
|
for(j = 0; j < 4; j++) {
|
|
b = ((i >> j) & 1);
|
|
v |= b << (2 * j);
|
|
v |= b << (2 * j + 1);
|
|
}
|
|
expand4to8[i] = v;
|
|
}
|
|
|
|
vga_reset(s);
|
|
|
|
switch(ds->depth) {
|
|
case 8:
|
|
s->rgb_to_pixel = rgb_to_pixel8_dup;
|
|
break;
|
|
case 15:
|
|
s->rgb_to_pixel = rgb_to_pixel15_dup;
|
|
break;
|
|
default:
|
|
case 16:
|
|
s->rgb_to_pixel = rgb_to_pixel16_dup;
|
|
break;
|
|
case 32:
|
|
s->rgb_to_pixel = rgb_to_pixel32_dup;
|
|
break;
|
|
}
|
|
|
|
s->vram_ptr = vga_ram_base;
|
|
s->vram_offset = vga_ram_offset;
|
|
s->vram_size = vga_ram_size;
|
|
s->ds = ds;
|
|
|
|
register_ioport_write(0x3c0, 16, vga_ioport_write, 1);
|
|
|
|
register_ioport_write(0x3b4, 2, vga_ioport_write, 1);
|
|
register_ioport_write(0x3d4, 2, vga_ioport_write, 1);
|
|
register_ioport_write(0x3ba, 1, vga_ioport_write, 1);
|
|
register_ioport_write(0x3da, 1, vga_ioport_write, 1);
|
|
|
|
register_ioport_read(0x3c0, 16, vga_ioport_read, 1);
|
|
|
|
register_ioport_read(0x3b4, 2, vga_ioport_read, 1);
|
|
register_ioport_read(0x3d4, 2, vga_ioport_read, 1);
|
|
register_ioport_read(0x3ba, 1, vga_ioport_read, 1);
|
|
register_ioport_read(0x3da, 1, vga_ioport_read, 1);
|
|
|
|
vga_io_memory = cpu_register_io_memory(0, vga_mem_read, vga_mem_write);
|
|
cpu_register_physical_memory(0xa0000, 0x20000, vga_io_memory);
|
|
return 0;
|
|
}
|