mirror of
https://github.com/ARMSX2/ARMSX1.git
synced 2026-08-24 16:53:35 -07:00
84 lines
2.1 KiB
C
84 lines
2.1 KiB
C
#include "bios.h"
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#include "../log.h"
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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psx_bios_t* psx_bios_create(void) {
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return (psx_bios_t*)malloc(sizeof(psx_bios_t));
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}
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void psx_bios_init(psx_bios_t* bios) {
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memset(bios, 0, sizeof(psx_bios_t));
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bios->io_base = PSX_BIOS_BEGIN;
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bios->io_size = PSX_BIOS_SIZE;
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bios->bus_delay = 18;
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}
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int psx_bios_load(psx_bios_t* bios, const char* path) {
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if (!path)
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return 0;
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FILE* file = fopen(path, "rb");
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if (!file) {
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log_error("Failed to open BIOS at '%s': %s", path, strerror(errno));
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return 1;
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}
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// Almost all PS1 BIOS ROMs are 512 KiB in size.
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// There's (at least) one exception, and that is SCPH-5903.
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// This is a special asian model PS1 that had built-in support
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// for Video CD (VCD) playback. Its BIOS is double the normal
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// size
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fseek(file, 0, SEEK_END);
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size_t size = ftell(file);
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fseek(file, 0, SEEK_SET);
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bios->buf = malloc(size);
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bios->io_size = size;
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if (!fread(bios->buf, 1, size, file)) {
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log_error("Failed to read BIOS at '%s': %s", path, strerror(errno));
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return 2;
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}
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fclose(file);
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return 0;
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}
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uint32_t psx_bios_read32(psx_bios_t* bios, uint32_t offset) {
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return *((uint32_t*)(bios->buf + offset));
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}
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uint16_t psx_bios_read16(psx_bios_t* bios, uint32_t offset) {
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return *((uint16_t*)(bios->buf + offset));
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}
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uint8_t psx_bios_read8(psx_bios_t* bios, uint32_t offset) {
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return bios->buf[offset];
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}
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void psx_bios_write32(psx_bios_t* bios, uint32_t offset, uint32_t value) {
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log_warn("Unhandled 32-bit BIOS write at offset %08x (%08x)", offset, value);
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}
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void psx_bios_write16(psx_bios_t* bios, uint32_t offset, uint16_t value) {
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log_warn("Unhandled 16-bit BIOS write at offset %08x (%04x)", offset, value);
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}
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void psx_bios_write8(psx_bios_t* bios, uint32_t offset, uint8_t value) {
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log_warn("Unhandled 8-bit BIOS write at offset %08x (%02x)", offset, value);
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}
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void psx_bios_destroy(psx_bios_t* bios) {
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free(bios->buf);
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free(bios);
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}
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