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-rw-r--r--blastem.c148
1 files changed, 35 insertions, 113 deletions
diff --git a/blastem.c b/blastem.c
index fb5ce4b..8072132 100644
--- a/blastem.c
+++ b/blastem.c
@@ -780,9 +780,7 @@ void set_speed_percent(genesis_context * context, uint32_t percent)
#define MAX_MAP_CHUNKS (4+7+1)
-const memmap_chunk static_map[] = {
- {0, 0x400000, 0xFFFFFF, 0, MMAP_READ, cart,
- NULL, NULL, NULL, NULL},
+const memmap_chunk base_map[] = {
{0xE00000, 0x1000000, 0xFFFF, 0, MMAP_READ | MMAP_WRITE | MMAP_CODE, ram,
NULL, NULL, NULL, NULL},
{0xC00000, 0xE00000, 0x1FFFFF, 0, 0, NULL,
@@ -793,122 +791,44 @@ const memmap_chunk static_map[] = {
(read_8_fun)io_read, (write_8_fun)io_write}
};
-char * sram_filename;
+char * save_filename;
genesis_context * genesis;
-void save_sram()
+void persist_save()
{
- FILE * f = fopen(sram_filename, "wb");
+ FILE * f = fopen(save_filename, "wb");
if (!f) {
- fprintf(stderr, "Failed to open SRAM file %s for writing\n", sram_filename);
+ fprintf(stderr, "Failed to open %s file %s for writing\n", genesis->save_type == SAVE_I2C ? "EEPROM" : "SRAM", save_filename);
return;
}
- uint32_t size = genesis->save_ram_mask+1;
- if (genesis->save_flags != RAM_FLAG_BOTH) {
- size/= 2;
- }
- fwrite(genesis->save_ram, 1, size, f);
+ fwrite(genesis->save_storage, 1, genesis->save_size, f);
fclose(f);
- printf("Saved SRAM to %s\n", sram_filename);
+ printf("Saved %s to %s\n", genesis->save_type == SAVE_I2C ? "EEPROM" : "SRAM", save_filename);
}
-void init_run_cpu(genesis_context * gen, FILE * address_log, char * statefile, uint8_t * debugger)
+void init_run_cpu(genesis_context * gen, rom_info *rom, FILE * address_log, char * statefile, uint8_t * debugger)
{
m68k_options opts;
- memmap_chunk memmap[MAX_MAP_CHUNKS];
- uint32_t num_chunks;
- void * initial_mapped = NULL;
- gen->save_ram = NULL;
- //TODO: Handle carts larger than 4MB
- //TODO: Handle non-standard mappers
- uint32_t size;
- /*
- if ((cart[RAM_ID/2] & 0xFF) == 'A' && (cart[RAM_ID/2] >> 8) == 'R') {
- //Cart has save RAM
- uint32_t rom_end = ((cart[ROM_END/2] << 16) | cart[ROM_END/2+1]) + 1;
- uint32_t ram_start = (cart[RAM_START/2] << 16) | cart[RAM_START/2+1];
- uint32_t ram_end = (cart[RAM_END/2] << 16) | cart[RAM_END/2+1];
- uint16_t ram_flags = cart[RAM_FLAGS/2];
- gen->save_flags = ram_flags & RAM_FLAG_MASK;
- memset(memmap, 0, sizeof(memmap_chunk)*2);
- if (ram_start >= rom_end) {
- memmap[0].end = rom_end;
- memmap[0].mask = 0xFFFFFF;
- memmap[0].flags = MMAP_READ;
- memmap[0].buffer = cart;
-
- ram_start &= 0xFFFFFE;
- ram_end |= 1;
- memmap[1].start = ram_start;
- gen->save_ram_mask = memmap[1].mask = ram_end-ram_start;
- ram_end += 1;
- memmap[1].end = ram_end;
- memmap[1].flags = MMAP_READ | MMAP_WRITE;
- size = ram_end-ram_start;
- if ((ram_flags & RAM_FLAG_MASK) == RAM_FLAG_ODD) {
- memmap[1].flags |= MMAP_ONLY_ODD;
- size /= 2;
- } else if((ram_flags & RAM_FLAG_MASK) == RAM_FLAG_EVEN) {
- memmap[1].flags |= MMAP_ONLY_EVEN;
- size /= 2;
- }
- memmap[1].buffer = gen->save_ram = malloc(size);
-
- memcpy(memmap+2, static_map+1, sizeof(static_map)-sizeof(static_map[0]));
- num_chunks = sizeof(static_map)/sizeof(memmap_chunk)+1;
- } else {
- //Assume the standard Sega mapper for now
- memmap[0].end = 0x200000;
- memmap[0].mask = 0xFFFFFF;
- memmap[0].flags = MMAP_READ;
- memmap[0].buffer = cart;
-
- memmap[1].start = 0x200000;
- memmap[1].end = 0x400000;
- memmap[1].mask = 0x1FFFFF;
- ram_start &= 0xFFFFFE;
- ram_end |= 1;
- gen->save_ram_mask = ram_end-ram_start;
- memmap[1].flags = MMAP_READ | MMAP_PTR_IDX | MMAP_FUNC_NULL;
- memmap[1].ptr_index = 2;
- memmap[1].read_16 = (read_16_fun)read_sram_w;//these will only be called when mem_pointers[2] == NULL
- memmap[1].read_8 = (read_8_fun)read_sram_b;
- memmap[1].write_16 = (write_16_fun)write_sram_area_w;//these will be called all writes to the area
- memmap[1].write_8 = (write_8_fun)write_sram_area_b;
- memcpy(memmap+2, static_map+1, sizeof(static_map)-sizeof(static_map[0]));
- num_chunks = sizeof(static_map)/sizeof(memmap_chunk)+1;
- memset(memmap+num_chunks, 0, sizeof(memmap[num_chunks]));
- memmap[num_chunks].start = 0xA13000;
- memmap[num_chunks].end = 0xA13100;
- memmap[num_chunks].mask = 0xFF;
- memmap[num_chunks].write_16 = (write_16_fun)write_bank_reg_w;
- memmap[num_chunks].write_8 = (write_8_fun)write_bank_reg_b;
- num_chunks++;
- ram_end++;
- size = ram_end-ram_start;
- if ((ram_flags & RAM_FLAG_MASK) != RAM_FLAG_BOTH) {
- size /= 2;
- }
- gen->save_ram = malloc(size);
- memmap[1].buffer = initial_mapped = cart + 0x200000/2;
- }
- } else {
- memcpy(memmap, static_map, sizeof(static_map));
- num_chunks = sizeof(static_map)/sizeof(memmap_chunk);
- }
- */
- if (gen->save_ram) {
- memset(gen->save_ram, 0, size);
- FILE * f = fopen(sram_filename, "rb");
+
+ gen->save_type = rom->save_type;
+ if (gen->save_type != SAVE_NONE) {
+ gen->save_ram_mask = rom->save_mask;
+ gen->save_size = rom->save_size;
+ gen->save_storage = rom->save_buffer;
+ memset(gen->save_storage, 0, rom->save_size);
+ FILE * f = fopen(save_filename, "rb");
if (f) {
- uint32_t read = fread(gen->save_ram, 1, size, f);
+ uint32_t read = fread(gen->save_storage, 1, rom->save_size, f);
fclose(f);
if (read > 0) {
- printf("Loaded SRAM from %s\n", sram_filename);
+ printf("Loaded %s from %s\n", rom->save_type == SAVE_I2C ? "EEPROM" : "SRAM", save_filename);
}
}
- atexit(save_sram);
+ atexit(persist_save);
+ } else {
+ gen->save_storage = NULL;
}
- init_m68k_opts(&opts, memmap, num_chunks, MCLKS_PER_68K);
+
+ init_m68k_opts(&opts, rom->map, rom->map_chunks, MCLKS_PER_68K);
opts.address_log = address_log;
m68k_context *context = init_68k_context(&opts);
gen->m68k = context;
@@ -921,8 +841,8 @@ void init_run_cpu(genesis_context * gen, FILE * address_log, char * statefile, u
//work RAM
context->mem_pointers[1] = ram;
//save RAM/map
- context->mem_pointers[2] = initial_mapped;
- context->mem_pointers[3] = (uint16_t *)gen->save_ram;
+ context->mem_pointers[2] = rom->map[1].buffer;
+ context->mem_pointers[3] = (uint16_t *)gen->save_storage;
if (statefile) {
uint32_t pc = load_gst(gen, statefile);
@@ -1084,7 +1004,7 @@ int main(int argc, char ** argv)
return 1;
}
} else if (!loaded) {
- if(rom_size = load_rom(argv[i])) {
+ if (!(rom_size = load_rom(argv[i]))) {
fprintf(stderr, "Failed to open %s for reading\n", argv[i]);
return 1;
}
@@ -1101,7 +1021,7 @@ int main(int argc, char ** argv)
return 1;
}
tern_node *rom_db = load_rom_db();
- rom_info info = configure_rom(rom_db, cart, rom_size, static_map+1, sizeof(static_map)/sizeof(static_map[0]) - 1);
+ rom_info info = configure_rom(rom_db, cart, rom_size, base_map, sizeof(base_map)/sizeof(base_map[0]));
byteswap_rom();
set_region(&info, force_version);
update_title(info.name);
@@ -1158,20 +1078,22 @@ int main(int argc, char ** argv)
setup_io_devices(config, gen.ports);
int fname_size = strlen(romfname);
- sram_filename = malloc(fname_size+6);
- memcpy(sram_filename, romfname, fname_size);
+ char * ext = info.save_type == SAVE_I2C ? "eeprom" : "sram";
+ save_filename = malloc(fname_size+strlen(ext) + 2);
+ memcpy(save_filename, romfname, fname_size);
int i;
for (i = fname_size-1; fname_size >= 0; --i) {
- if (sram_filename[i] == '.') {
- strcpy(sram_filename + i + 1, "sram");
+ if (save_filename[i] == '.') {
+ strcpy(save_filename + i + 1, ext);
break;
}
}
if (i < 0) {
- strcpy(sram_filename + fname_size, ".sram");
+ save_filename[fname_size] = '.';
+ strcpy(save_filename + fname_size + 1, ext);
}
set_keybindings(gen.ports);
- init_run_cpu(&gen, address_log, statefile, debuggerfun);
+ init_run_cpu(&gen, &info, address_log, statefile, debuggerfun);
return 0;
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-19 14:29:06 +0000