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
 83
 84DECL_BITFIELD(GBADMARegister, uint16_t);
 85DECL_BITS(GBADMARegister, DestControl, 5, 2);
 86DECL_BITS(GBADMARegister, SrcControl, 7, 2);
 87DECL_BIT(GBADMARegister, Repeat, 9);
 88DECL_BIT(GBADMARegister, Width, 10);
 89DECL_BIT(GBADMARegister, DRQ, 11);
 90DECL_BITS(GBADMARegister, Timing, 12, 2);
 91DECL_BIT(GBADMARegister, DoIRQ, 14);
 92DECL_BIT(GBADMARegister, Enable, 15);
 93
 94struct GBADMA {
 95	GBADMARegister reg;
 96
 97	uint32_t source;
 98	uint32_t dest;
 99	int32_t count;
100	uint32_t nextSource;
101	uint32_t nextDest;
102	int32_t nextCount;
103	int32_t nextEvent;
104};
105
106struct GBAMemory {
107	uint32_t* bios;
108	uint32_t* wram;
109	uint32_t* iwram;
110	uint32_t* rom;
111	uint16_t io[SIZE_IO >> 1];
112
113	struct GBACartridgeGPIO gpio;
114	struct GBASavedata savedata;
115	size_t romSize;
116	uint16_t romID;
117	int fullBios;
118
119	char waitstatesSeq32[256];
120	char waitstatesSeq16[256];
121	char waitstatesNonseq32[256];
122	char waitstatesNonseq16[256];
123	char waitstatesPrefetchSeq32[16];
124	char waitstatesPrefetchSeq16[16];
125	char waitstatesPrefetchNonseq32[16];
126	char waitstatesPrefetchNonseq16[16];
127	int activeRegion;
128	uint32_t biosPrefetch;
129
130	struct GBADMA dma[4];
131	int activeDMA;
132	int32_t nextDMA;
133	int32_t eventDiff;
134};
135
136void GBAMemoryInit(struct GBA* gba);
137void GBAMemoryDeinit(struct GBA* gba);
138
139void GBAMemoryReset(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