1#ifndef GBA_MEMORY_H
  2#define GBA_MEMORY_H
  3
  4#include "arm.h"
  5
  6#include "gba-gpio.h"
  7#include "gba-savedata.h"
  8
  9#include <string.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};
 27
 28enum GBAMemoryBase {
 29	BASE_BIOS = 0x00000000,
 30	BASE_WORKING_RAM = 0x02000000,
 31	BASE_WORKING_IRAM = 0x03000000,
 32	BASE_IO = 0x04000000,
 33	BASE_PALETTE_RAM = 0x05000000,
 34	BASE_VRAM = 0x06000000,
 35	BASE_OAM = 0x07000000,
 36	BASE_CART0 = 0x08000000,
 37	BASE_CART0_EX = 0x09000000,
 38	BASE_CART1 = 0x0A000000,
 39	BASE_CART1_EX = 0x0B000000,
 40	BASE_CART2 = 0x0C000000,
 41	BASE_CART2_EX = 0x0D000000,
 42	BASE_CART_SRAM = 0x0E000000
 43};
 44
 45enum {
 46	SIZE_BIOS = 0x00004000,
 47	SIZE_WORKING_RAM = 0x00040000,
 48	SIZE_WORKING_IRAM = 0x00008000,
 49	SIZE_IO = 0x00000400,
 50	SIZE_PALETTE_RAM = 0x00000400,
 51	SIZE_VRAM = 0x00018000,
 52	SIZE_OAM = 0x00000400,
 53	SIZE_CART0 = 0x02000000,
 54	SIZE_CART1 = 0x02000000,
 55	SIZE_CART2 = 0x02000000,
 56	SIZE_CART_SRAM = 0x00008000,
 57	SIZE_CART_FLASH512 = 0x00010000,
 58	SIZE_CART_FLASH1M = 0x00020000,
 59	SIZE_CART_EEPROM = 0x00002000
 60};
 61
 62enum {
 63	OFFSET_MASK = 0x00FFFFFF,
 64	BASE_OFFSET = 24
 65};
 66
 67enum DMAControl {
 68	DMA_INCREMENT = 0,
 69	DMA_DECREMENT = 1,
 70	DMA_FIXED = 2,
 71	DMA_INCREMENT_RELOAD = 3
 72};
 73
 74enum DMATiming {
 75	DMA_TIMING_NOW = 0,
 76	DMA_TIMING_VBLANK = 1,
 77	DMA_TIMING_HBLANK = 2,
 78	DMA_TIMING_CUSTOM = 3
 79};
 80
 81struct GBADMA {
 82	union {
 83		struct {
 84			int : 5;
 85			enum DMAControl dstControl : 2;
 86			enum DMAControl srcControl : 2;
 87			unsigned repeat : 1;
 88			unsigned width : 1;
 89			unsigned drq : 1;
 90			enum DMATiming timing : 2;
 91			unsigned doIrq : 1;
 92			unsigned enable : 1;
 93		};
 94		uint16_t packed;
 95	};
 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 nextIRQ;
104};
105
106struct GBAMemory {
107	struct ARMMemory d;
108	struct GBA* p;
109
110	uint32_t* bios;
111	uint32_t* wram;
112	uint32_t* iwram;
113	uint32_t* rom;
114	uint16_t io[SIZE_IO >> 1];
115
116	struct GBACartridgeGPIO gpio;
117	struct GBASavedata savedata;
118	size_t romSize;
119	uint16_t romID;
120	int fullBios;
121
122	char waitstates32[256];
123	char waitstates16[256];
124	char waitstatesSeq32[256];
125	char waitstatesSeq16[256];
126	char waitstatesPrefetch32[256];
127	char waitstatesPrefetch16[256];
128	int activeRegion;
129	uint32_t biosPrefetch;
130
131	struct GBADMA dma[4];
132};
133
134int32_t GBAMemoryProcessEvents(struct GBAMemory* memory, int32_t cycles);
135
136int32_t GBALoad32(struct ARMMemory* memory, uint32_t address, int* cycleCounter);
137int16_t GBALoad16(struct ARMMemory* memory, uint32_t address, int* cycleCounter);
138uint16_t GBALoadU16(struct ARMMemory* memory, uint32_t address, int* cycleCounter);
139int8_t GBALoad8(struct ARMMemory* memory, uint32_t address, int* cycleCounter);
140uint8_t GBALoadU8(struct ARMMemory* memory, uint32_t address, int* cycleCounter);
141
142void GBAStore32(struct ARMMemory* memory, uint32_t address, int32_t value, int* cycleCounter);
143void GBAStore16(struct ARMMemory* memory, uint32_t address, int16_t value, int* cycleCounter);
144void GBAStore8(struct ARMMemory* memory, uint32_t address, int8_t value, int* cycleCounter);
145
146void GBAAdjustWaitstates(struct GBAMemory* memory, uint16_t parameters);
147
148void GBAMemoryWriteDMASAD(struct GBAMemory* memory, int dma, uint32_t address);
149void GBAMemoryWriteDMADAD(struct GBAMemory* memory, int dma, uint32_t address);
150void GBAMemoryWriteDMACNT_LO(struct GBAMemory* memory, int dma, uint16_t count);
151uint16_t GBAMemoryWriteDMACNT_HI(struct GBAMemory* memory, int dma, uint16_t control);
152
153void GBAMemoryScheduleDMA(struct GBAMemory* memory, int number, struct GBADMA* info);
154void GBAMemoryServiceDMA(struct GBAMemory* memory, int number, struct GBADMA* info);
155void GBAMemoryRunHblankDMAs(struct GBAMemory* memory);
156void GBAMemoryRunVblankDMAs(struct GBAMemory* memory);
157
158#endif