1/* Copyright (c) 2013-2016 Jeffrey Pfau
 2 *
 3 * This Source Code Form is subject to the terms of the Mozilla Public
 4 * License, v. 2.0. If a copy of the MPL was not distributed with this
 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 6#ifndef GB_MEMORY_H
 7#define GB_MEMORY_H
 8
 9#include "util/common.h"
10
11#include "lr35902/lr35902.h"
12
13struct GB;
14
15enum {
16	GB_BASE_CART_BANK0 = 0x0000,
17	GB_BASE_CART_BANK1 = 0x4000,
18	GB_BASE_VRAM = 0x8000,
19	GB_BASE_EXTERNAL_RAM = 0xA000,
20	GB_BASE_WORKING_RAM_BANK0 = 0xC000,
21	GB_BASE_WORKING_RAM_BANK1 = 0xD000,
22	GB_BASE_OAM = 0xFE00,
23	GB_BASE_IO = 0xFF00,
24	GB_BASE_HRAM = 0xFF80,
25	GB_BASE_IE = 0xFFFF
26};
27
28enum {
29	GB_REGION_CART_BANK0 = 0x0,
30	GB_REGION_CART_BANK1 = 0x4,
31	GB_REGION_VRAM = 0x8,
32	GB_REGION_EXTERNAL_RAM = 0xA,
33	GB_REGION_WORKING_RAM_BANK0 = 0xC,
34	GB_REGION_WORKING_RAM_BANK1 = 0xD,
35	GB_REGION_WORKING_RAM_BANK1_MIRROR = 0xE,
36	GB_REGION_OTHER = 0xF,
37};
38
39enum {
40	GB_SIZE_CART_BANK0 = 0x4000,
41	GB_SIZE_VRAM = 0x2000,
42	GB_SIZE_EXTERNAL_RAM = 0x2000,
43	GB_SIZE_WORKING_RAM = 0x8000,
44	GB_SIZE_WORKING_RAM_BANK0 = 0x1000,
45	GB_SIZE_OAM = 0xA0,
46	GB_SIZE_IO = 0x80,
47	GB_SIZE_HRAM = 0x7F,
48};
49
50struct GBMemory {
51	uint8_t* rom;
52	uint8_t* romBank;
53
54	uint8_t* wram;
55	uint8_t* wramBank;
56
57	uint8_t io[GB_SIZE_IO];
58	bool ime;
59	uint8_t ie;
60
61	uint8_t hram[GB_SIZE_HRAM];
62
63	size_t romSize;
64};
65
66void GBMemoryInit(struct GB* gb);
67void GBMemoryDeinit(struct GB* gb);
68
69void GBMemoryReset(struct GB* gb);
70
71uint16_t GBLoad16(struct LR35902Core* cpu, uint16_t address);
72uint8_t GBLoad8(struct LR35902Core* cpu, uint16_t address);
73
74void GBStore16(struct LR35902Core* cpu, uint16_t address, int16_t value);
75void GBStore8(struct LR35902Core* cpu, uint16_t address, int8_t value);
76
77uint16_t GBView16(struct LR35902Core* cpu, uint16_t address);
78uint8_t GBView8(struct LR35902Core* cpu, uint16_t address);
79
80void GBPatch16(struct LR35902Core* cpu, uint16_t address, int16_t value, int16_t* old);
81void GBPatch8(struct LR35902Core* cpu, uint16_t address, int8_t value, int8_t* old);
82
83#endif