Diff: mem.h

Revision:

17:c9afe1a7b423

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mem.h	Sun Jan 13 19:00:10 2019 +0000
@@ -0,0 +1,176 @@
+#ifndef GBC_MEM_H
+#define GBC_MEM_H
+
+#include "types.h"
+#include "stdio.h"
+#include "platform.h"
+
+// interrupt flags
+#define INTERRUPT_KEY 0x10;
+
+// interrupt vector locations
+#define VBLANK_INTERRUPT    0x0040
+#define LCDC_INTERRUPT      0x0048
+#define TIMER_INTERRUPT     0x0050
+#define SERIAL_INTERRUPT    0x0058
+#define HIGH_TO_LOW_P10_P13 0x0060
+
+// IO Regs (offset from 0xff00)
+#define IO_P1        0x0  // joystick               (needs keyboard handler)
+#define IO_SERIAL_SB 0x01 // serial transfer data   (don't support)
+#define IO_SERIAL_SC 0x02 // serial control         (don't support)
+#define IO_DIV       0x04 // div
+#define IO_TIMA      0x05 // timer value            (nyi)
+#define IO_TMA       0x06 // timer reload           (nyi)
+#define IO_TAC       0x07 // TIMER CONTROL (enable, speed) (nyi)
+#define IO_IF        0x0f
+
+#define IO_NR10      0x10
+#define IO_NR11      0x11
+#define IO_NR12      0x12
+#define IO_NR13      0x13
+#define IO_NR14      0x14
+
+#define IO_NR21      0x16
+#define IO_NR22      0x17
+#define IO_NR23      0x18
+#define IO_NR24      0x19
+
+#define IO_NR30      0x1a
+#define IO_NR31      0x1b
+#define IO_NR32      0x1c
+#define IO_NR33      0x1d
+#define IO_NR34      0x1e
+
+#define IO_NR41      0x20
+#define IO_NR42      0x21
+#define IO_NR43      0x22
+#define IO_NR44      0x23
+
+#define IO_NR50      0x24
+#define IO_NR51      0x25
+#define IO_NR52      0x26
+
+#define IO_WAVE_PATTERN 0x30 // this is 16 bytes
+
+#define IO_LCDC      0x40 // yes, revisit
+#define IO_STAT      0x41 // no
+#define IO_SCROLLY   0x42
+#define IO_SCROLLX   0x43
+#define IO_LY        0x44
+#define IO_LYC       0x45 // no
+
+#define IO_DMA       0x46 // yes
+#define IO_BGP       0x47 // ??
+#define IO_OBP0      0x48 // ??
+#define IO_OBP1      0x49 // ??
+#define IO_WINY      0x4a // no
+#define IO_WINX      0x4b // no
+
+#define IO_GBCSPEED  0x4d
+
+#define IO_EXIT_BIOS 0x50
+
+
+#define CART_INFO_ADDR      0x0100
+
+
+// cartridge types
+enum CartType {
+  ROM_ONLY = 0,
+  ROM_MBC1 = 1,
+  ROM_MBC1_RAM = 2,
+  ROM_MBC1_RAM_BATT = 3,
+  ROM_MBC2 = 5,
+  ROM_MBC2_BATT = 6,
+  ROM_RAM = 8,
+  ROM_RAM_BATT = 9,
+  ROM_MM01 = 0xb,
+  ROM_MM01_SRAM = 0xc,
+  ROM_MMM01_SRAM_BATT = 0xd,
+  ROM_MBC3_TIMER_BATT = 0xf,
+  ROM_MBC3_TIMER_RAM_BATT = 0x10, // pkmn crystal
+  ROM_MBC3 = 0x11,
+  ROM_MBC3_RAM = 0x12,
+  ROM_MBC3_RAM_BATT = 0x13, // pkmn red
+  ROM_MBC5 = 0x19,
+  ROM_MBC_RAM = 0x1a,
+  ROM_MBC5_RAM_BATT = 0x1b,
+  ROM_MBC5_RUMBLE = 0x1c,
+  ROM_MBC5_RUMBLE_SRAM = 0x1d,
+  ROM_MBC5_RUMBLE_SRAM_BATT = 0x1e,
+  POCKET_CAMERA = 0x1f,
+  BANDAI_TAMA5 = 0xfd,
+  HUDSON_HUC3 = 0xfe,
+  HUDSON_HUC1 = 0xff
+};
+
+// in banks, of 16 KByte each
+enum RomSize {
+  BANK_2 = 0,
+  BANK_4 = 1,
+  BANK_8 = 2,
+  BANK_16 = 3,
+  BANK_32 = 4,
+  BANK_64 = 5, // pkmn red: 1 MB
+  BANK_128 = 6, // pkmn crystal
+  BANK_72 = 0x52,
+  BANK_80 = 0x53,
+  BANK_96 = 0x54
+};
+
+enum RamSize {
+  NONE = 0,
+  SIZE_2KB = 1, // 1 bank
+  SIZE_8KB = 2, // 1 bank
+  SIZE_32KB = 3, // 4 banks, pkmn red, crystal
+  SIZE_128KB = 4, // 16 banks
+};
+
+struct CartInfo {
+  u8 beginExec[4];        // 0x0 -> 0x3
+  u8 nintendoGraphic[48]; // 0x3 ->
+  char title[15];
+  u8 isColor; // compare against CARTRIDGE_IS_COLOR
+  u8 license1;
+  u8 license2;
+  u8 SGB;
+  CartType cartType;
+  RomSize romSize;
+  RamSize ramSize;
+  u8 notJapan;
+  u8 license3;
+  u8 maskRomVersion;
+
+  void print();
+};
+
+struct MemState {
+  bool inBios;
+  u8 mbcType;
+  u8 nRomBanks;
+  u8 nRamBanks;
+  u8* rom0;
+  u8* mappedRom;
+  u8* vram;
+  u8* mappedRam;
+  u8* disabledMappedRam;
+  u8* internalRam;
+  u8* mappedRamAllocation;
+  u8* ioRegs;
+  u8* upperRam;
+  u8* spriteAttribute;
+};
+
+// external interface
+extern MemState globalMemState;
+void initMem(FileLoadData file); // intialize memory for a cartridge
+u8 readByte(u16 addr);           // read a byte from memory
+u16 readU16(u16 addr);           // read 16-bits from memory
+void writeByte(u8 byte, u16 addr); // write a byte to memory
+void writeU16(u16 mem, u16 addr); // read 16-bits from memory
+void saveGame();
+void loadGame();
+
+
+#endif //GBC_MEM_H