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