1#ifndef GBA_MEMORY_H
  2#define GBA_MEMORY_H
  3
  4#include "common.h"
  5
  6#include "arm.h"
  7
  8#include "gba-gpio.h"
  9#include "gba-savedata.h"
 10
 11enum GBAMemoryRegion {
 12	REGION_BIOS = 0x0,
 13	REGION_WORKING_RAM = 0x2,
 14	REGION_WORKING_IRAM = 0x3,
 15	REGION_IO = 0x4,
 16	REGION_PALETTE_RAM = 0x5,
 17	REGION_VRAM = 0x6,
 18	REGION_OAM = 0x7,
 19	REGION_CART0 = 0x8,
 20	REGION_CART0_EX = 0x9,
 21	REGION_CART1 = 0xA,
 22	REGION_CART1_EX = 0xB,
 23	REGION_CART2 = 0xC,
 24	REGION_CART2_EX = 0xD,
 25	REGION_CART_SRAM = 0xE,
 26	REGION_CART_SRAM_MIRROR = 0xF
 27};
 28
 29enum GBAMemoryBase {
 30	BASE_BIOS = 0x00000000,
 31	BASE_WORKING_RAM = 0x02000000,
 32	BASE_WORKING_IRAM = 0x03000000,
 33	BASE_IO = 0x04000000,
 34	BASE_PALETTE_RAM = 0x05000000,
 35	BASE_VRAM = 0x06000000,
 36	BASE_OAM = 0x07000000,
 37	BASE_CART0 = 0x08000000,
 38	BASE_CART0_EX = 0x09000000,
 39	BASE_CART1 = 0x0A000000,
 40	BASE_CART1_EX = 0x0B000000,
 41	BASE_CART2 = 0x0C000000,
 42	BASE_CART2_EX = 0x0D000000,
 43	BASE_CART_SRAM = 0x0E000000,
 44	BASE_CART_SRAM_MIRROR = 0x0F000000
 45};
 46
 47enum {
 48	SIZE_BIOS = 0x00004000,
 49	SIZE_WORKING_RAM = 0x00040000,
 50	SIZE_WORKING_IRAM = 0x00008000,
 51	SIZE_IO = 0x00000400,
 52	SIZE_PALETTE_RAM = 0x00000400,
 53	SIZE_VRAM = 0x00018000,
 54	SIZE_OAM = 0x00000400,
 55	SIZE_CART0 = 0x02000000,
 56	SIZE_CART1 = 0x02000000,
 57	SIZE_CART2 = 0x02000000,
 58	SIZE_CART_SRAM = 0x00008000,
 59	SIZE_CART_FLASH512 = 0x00010000,
 60	SIZE_CART_FLASH1M = 0x00020000,
 61	SIZE_CART_EEPROM = 0x00002000
 62};
 63
 64enum {
 65	OFFSET_MASK = 0x00FFFFFF,
 66	BASE_OFFSET = 24
 67};
 68
 69enum DMAControl {
 70	DMA_INCREMENT = 0,
 71	DMA_DECREMENT = 1,
 72	DMA_FIXED = 2,
 73	DMA_INCREMENT_RELOAD = 3
 74};
 75
 76enum DMATiming {
 77	DMA_TIMING_NOW = 0,
 78	DMA_TIMING_VBLANK = 1,
 79	DMA_TIMING_HBLANK = 2,
 80	DMA_TIMING_CUSTOM = 3
 81};
 82
 83struct GBADMA {
 84	union {
 85		struct {
 86			int : 5;
 87			enum DMAControl dstControl : 2;
 88			enum DMAControl srcControl : 2;
 89			unsigned repeat : 1;
 90			unsigned width : 1;
 91			unsigned drq : 1;
 92			enum DMATiming timing : 2;
 93			unsigned doIrq : 1;
 94			unsigned enable : 1;
 95		};
 96		uint16_t packed;
 97	};
 98
 99	uint32_t source;
100	uint32_t dest;
101	int32_t count;
102	uint32_t nextSource;
103	uint32_t nextDest;
104	int32_t nextCount;
105	int32_t nextEvent;
106};
107
108struct GBAMemory {
109	uint32_t* bios;
110	uint32_t* wram;
111	uint32_t* iwram;
112	uint32_t* rom;
113	uint16_t io[SIZE_IO >> 1];
114
115	struct GBACartridgeGPIO gpio;
116	struct GBASavedata savedata;
117	size_t romSize;
118	uint16_t romID;
119	int fullBios;
120
121	char waitstatesSeq32[256];
122	char waitstatesSeq16[256];
123	char waitstatesNonseq32[256];
124	char waitstatesNonseq16[256];
125	char waitstatesPrefetchSeq32[16];
126	char waitstatesPrefetchSeq16[16];
127	char waitstatesPrefetchNonseq32[16];
128	char waitstatesPrefetchNonseq16[16];
129	int activeRegion;
130	uint32_t biosPrefetch;
131
132	struct GBADMA dma[4];
133	int activeDMA;
134	int32_t nextDMA;
135	int32_t eventDiff;
136};
137
138void GBAMemoryInit(struct GBA* gba);
139void GBAMemoryDeinit(struct GBA* gba);
140
141int32_t GBALoad32(struct ARMCore* cpu, uint32_t address, int* cycleCounter);
142int16_t GBALoad16(struct ARMCore* cpu, uint32_t address, int* cycleCounter);
143uint16_t GBALoadU16(struct ARMCore* cpu, uint32_t address, int* cycleCounter);
144int8_t GBALoad8(struct ARMCore* cpu, uint32_t address, int* cycleCounter);
145uint8_t GBALoadU8(struct ARMCore* cpu, uint32_t address, int* cycleCounter);
146
147void GBAStore32(struct ARMCore* cpu, uint32_t address, int32_t value, int* cycleCounter);
148void GBAStore16(struct ARMCore* cpu, uint32_t address, int16_t value, int* cycleCounter);
149void GBAStore8(struct ARMCore* cpu, uint32_t address, int8_t value, int* cycleCounter);
150
151void GBAAdjustWaitstates(struct GBA* gba, uint16_t parameters);
152
153void GBAMemoryWriteDMASAD(struct GBA* gba, int dma, uint32_t address);
154void GBAMemoryWriteDMADAD(struct GBA* gba, int dma, uint32_t address);
155void GBAMemoryWriteDMACNT_LO(struct GBA* gba, int dma, uint16_t count);
156uint16_t GBAMemoryWriteDMACNT_HI(struct GBA* gba, int dma, uint16_t control);
157
158void GBAMemoryScheduleDMA(struct GBA* gba, int number, struct GBADMA* info);
159void GBAMemoryRunHblankDMAs(struct GBA* gba, int32_t cycles);
160void GBAMemoryRunVblankDMAs(struct GBA* gba, int32_t cycles);
161void GBAMemoryUpdateDMAs(struct GBA* gba, int32_t cycles);
162int32_t GBAMemoryRunDMAs(struct GBA* gba, int32_t cycles);
163
164struct GBASerializedState;
165void GBAMemorySerialize(struct GBAMemory* memory, struct GBASerializedState* state);
166void GBAMemoryDeserialize(struct GBAMemory* memory, struct GBASerializedState* state);
167
168#endif