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Add work RAM.

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This commit is contained in:
Fabien Freling 2015-05-08 14:47:30 +02:00
parent 214590e2db
commit 7805e50062
1 changed files with 7 additions and 0 deletions
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7
src/memory.ml
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@ -8,6 +8,8 @@ type map = {
rom_bank_00 : bytes; (* cartridge, 16KB *) rom_bank_00 : bytes; (* cartridge, 16KB *)
rom_bank_01 : bytes; (* additional bank, 16KB *) rom_bank_01 : bytes; (* additional bank, 16KB *)
vram : bytes; (* Video RAM, 8KB *) vram : bytes; (* Video RAM, 8KB *)
wram_bank_0 : bytes; (* work RAM, 4KB *)
wram_bank_1 : bytes; (* work RAM, 4KB *)
io : bytes; (* I/O ports *) io : bytes; (* I/O ports *)
hram : bytes; (* High RAM, 8KB *) hram : bytes; (* High RAM, 8KB *)
interrupt : bytes; (* Interrupt Enable Register *) interrupt : bytes; (* Interrupt Enable Register *)
@ -18,6 +20,8 @@ let init (cartridge: Cartridge.t) =
rom_bank_00 = sub cartridge.full_rom 0 0x4000; rom_bank_00 = sub cartridge.full_rom 0 0x4000;
rom_bank_01 = create 0x4000; rom_bank_01 = create 0x4000;
vram = create 0x2000; vram = create 0x2000;
wram_bank_0 = create 0x1000;
wram_bank_1 = create 0x1000;
io = create 0x0080; io = create 0x0080;
hram = create 0x2000; hram = create 0x2000;
interrupt = create 1 interrupt = create 1
@ -28,6 +32,9 @@ let get_mem_bank mem addr =
| x when x < 0x4000 -> mem.rom_bank_00, x | x when x < 0x4000 -> mem.rom_bank_00, x
| x when x < 0x8000 -> mem.rom_bank_01, (x - 0x4000) | x when x < 0x8000 -> mem.rom_bank_01, (x - 0x4000)
| x when x < 0xA000 -> mem.vram, (x - 0x8000) | x when x < 0xA000 -> mem.vram, (x - 0x8000)
| x when x < 0xC000 -> failwith "Unimplemented memory range."
| x when x < 0xD000 -> mem.wram_bank_0, (x - 0xC000)
| x when x < 0xE000 -> mem.wram_bank_1, (x - 0xD000)
| x when x < 0xFF00 -> failwith "Unimplemented memory range." | x when x < 0xFF00 -> failwith "Unimplemented memory range."
| x when x < 0xFF80 -> mem.io, x - 0xFF00 | x when x < 0xFF80 -> mem.io, x - 0xFF00
| x when x < 0xFFFF -> mem.hram, x - 0xFF80 | x when x < 0xFFFF -> mem.hram, x - 0xFF80