2ca4ead570
Misc ViRGE fixes. Changes to memory mapping. Changes to PCI handling. Disabled 'AMI WinBIOS 486 PCI' due to incomplete chipset emulation. Invalid GUS register reads no longer kill the emulator.
125 lines
4 KiB
C
125 lines
4 KiB
C
#include <stdlib.h>
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#include <stdio.h>
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#include "ibm.h"
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#include "mem.h"
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#include "rom.h"
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FILE *romfopen(char *fn, char *mode)
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{
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char s[512];
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strcpy(s, pcempath);
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put_backslash(s);
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strcat(s, fn);
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return fopen(s, mode);
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}
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int rom_present(char *fn)
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{
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FILE *f;
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char s[512];
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strcpy(s, pcempath);
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put_backslash(s);
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strcat(s, fn);
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f = fopen(s, "rb");
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if (f)
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{
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fclose(f);
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return 1;
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}
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return 0;
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}
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static uint8_t rom_read(uint32_t addr, void *p)
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{
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rom_t *rom = (rom_t *)p;
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// pclog("rom_read : %08x %08x %02x\n", addr, rom->mask, rom->rom[addr & rom->mask]);
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return rom->rom[addr & rom->mask];
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}
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uint16_t rom_readw(uint32_t addr, void *p)
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{
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rom_t *rom = (rom_t *)p;
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// pclog("rom_readw: %08x %08x %04x\n", addr, rom->mask, *(uint16_t *)&rom->rom[addr & rom->mask]);
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return *(uint16_t *)&rom->rom[addr & rom->mask];
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}
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uint32_t rom_readl(uint32_t addr, void *p)
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{
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rom_t *rom = (rom_t *)p;
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// pclog("rom_readl: %08x %08x %08x\n", addr, rom->mask, *(uint32_t *)&rom->rom[addr & rom->mask]);
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return *(uint32_t *)&rom->rom[addr & rom->mask];
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}
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int rom_init(rom_t *rom, char *fn, uint32_t address, int size, int mask, int file_offset, uint32_t flags)
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{
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FILE *f = romfopen(fn, "rb");
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if (!f)
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{
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pclog("ROM image not found : %s\n", fn);
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return -1;
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}
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rom->rom = malloc(size);
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fseek(f, file_offset, SEEK_SET);
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fread(rom->rom, size, 1, f);
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fclose(f);
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rom->mask = mask;
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mem_mapping_add(&rom->mapping, address, size, rom_read,
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rom_readw,
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rom_readl,
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mem_write_null,
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mem_write_nullw,
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mem_write_nulll,
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rom->rom,
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flags,
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rom);
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return 0;
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}
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int rom_init_interleaved(rom_t *rom, char *fn_low, char *fn_high, uint32_t address, int size, int mask, int file_offset, uint32_t flags)
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{
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FILE *f_low = romfopen(fn_low, "rb");
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FILE *f_high = romfopen(fn_high, "rb");
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int c;
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if (!f_low || !f_high)
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{
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if (!f_low)
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pclog("ROM image not found : %s\n", fn_low);
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else
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fclose(f_low);
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if (!f_high)
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pclog("ROM image not found : %s\n", fn_high);
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else
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fclose(f_high);
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return -1;
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}
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rom->rom = malloc(size);
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fseek(f_low, file_offset, SEEK_SET);
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fseek(f_high, file_offset, SEEK_SET);
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for (c = 0; c < size; c += 2)
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{
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rom->rom[c] = getc(f_low);
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rom->rom[c + 1] = getc(f_high);
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}
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fclose(f_high);
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fclose(f_low);
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rom->mask = mask;
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mem_mapping_add(&rom->mapping, address, size, rom_read,
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rom_readw,
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rom_readl,
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mem_write_null,
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mem_write_nullw,
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mem_write_nulll,
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rom->rom,
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flags,
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rom);
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return 0;
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}
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