GBA Memory: Matrix Memory support

CHANGES

@@ -55,6 +55,7 @@ Misc:
  - GBA Cheats: Allow multiple ROM patches in the same slot
  - GB: Skip BIOS option now works
  - Libretro: Add frameskip option
+ - GBA Memory: 64 MiB GBA Video cartridge support
 
 0.6.1: (2017-10-01)
 Bugfixes:

include/mgba/internal/gba/matrix.h

@@ -0,0 +1,28 @@
+/* Copyright (c) 2013-2018 Jeffrey Pfau
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#ifndef GBA_MATRIX_H
+#define GBA_MATRIX_H
+
+#include <mgba-util/common.h>
+
+CXX_GUARD_START
+
+struct GBAMatrix {
+	uint32_t cmd;
+	uint32_t paddr;
+	uint32_t vaddr;
+	uint32_t size;
+};
+
+struct GBA;
+struct GBAMemory;
+void GBAMatrixReset(struct GBA*);
+void GBAMatrixWrite(struct GBA*, uint32_t address, uint32_t value);
+void GBAMatrixWrite16(struct GBA*, uint32_t address, uint16_t value);
+
+CXX_GUARD_END
+
+#endif

include/mgba/internal/gba/memory.h

@@ -17,6 +17,7 @@ CXX_GUARD_START
 #include <mgba/internal/gba/hardware.h>
 #include <mgba/internal/gba/savedata.h>
 #include <mgba/internal/gba/vfame.h>
+#include <mgba/internal/gba/matrix.h>
 
 enum GBAMemoryRegion {
 	REGION_BIOS = 0x0,
@@ -106,6 +107,7 @@ struct GBAMemory {
 	struct GBACartridgeHardware hw;
 	struct GBASavedata savedata;
 	struct GBAVFameCart vfame;
+	struct GBAMatrix matrix;
 	size_t romSize;
 	uint32_t romMask;
 	uint16_t romID;

src/gba/gba.c

@@ -125,7 +125,9 @@ void GBAUnloadROM(struct GBA* gba) {
 
 	if (gba->romVf) {
 #ifndef FIXED_ROM_BUFFER
-		gba->romVf->unmap(gba->romVf, gba->memory.rom, gba->pristineRomSize);
+		if (gba->isPristine) {
+			gba->romVf->unmap(gba->romVf, gba->memory.rom, gba->pristineRomSize);
+		}
 #endif
 		gba->romVf->close(gba->romVf);
 		gba->romVf = NULL;
@@ -207,6 +209,9 @@ void GBAReset(struct ARMCore* cpu) {
 
 	gba->debug = false;
 	memset(gba->debugString, 0, sizeof(gba->debugString));
+	if (gba->pristineRomSize > SIZE_CART0) {
+		GBAMatrixReset(gba);
+	}
 
 	if (!gba->romVf && gba->memory.rom) {
 		GBASkipBIOS(gba);
@@ -355,23 +360,30 @@ bool GBALoadROM(struct GBA* gba, struct VFile* vf) {
 	gba->pristineRomSize = vf->size(vf);
 	vf->seek(vf, 0, SEEK_SET);
 	if (gba->pristineRomSize > SIZE_CART0) {
-		gba->pristineRomSize = SIZE_CART0;
-	}
-	gba->isPristine = true;
+		gba->isPristine = false;
+		gba->memory.romSize = 0x01000000;
 #ifdef FIXED_ROM_BUFFER
-	if (gba->pristineRomSize <= romBufferSize) {
 		gba->memory.rom = romBuffer;
-		vf->read(vf, romBuffer, gba->pristineRomSize);
-	}
 #else
-	gba->memory.rom = vf->map(vf, gba->pristineRomSize, MAP_READ);
+		gba->memory.rom = anonymousMemoryMap(SIZE_CART0);
 #endif
+	} else {
+		gba->isPristine = true;
+#ifdef FIXED_ROM_BUFFER
+		if (gba->pristineRomSize <= romBufferSize) {
+			gba->memory.rom = romBuffer;
+			vf->read(vf, romBuffer, gba->pristineRomSize);
+		}
+#else
+		gba->memory.rom = vf->map(vf, gba->pristineRomSize, MAP_READ);
+#endif
+		gba->memory.romSize = gba->pristineRomSize;
+	}
 	if (!gba->memory.rom) {
 		mLOG(GBA, WARN, "Couldn't map ROM");
 		return false;
 	}
 	gba->yankedRomSize = 0;
-	gba->memory.romSize = gba->pristineRomSize;
 	gba->memory.romMask = toPow2(gba->memory.romSize) - 1;
 	gba->memory.mirroring = false;
 	gba->romCrc32 = doCrc32(gba->memory.rom, gba->memory.romSize);

src/gba/matrix.c

@@ -0,0 +1,75 @@
+/* Copyright (c) 2013-2018 Jeffrey Pfau
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#include <mgba/internal/gba/matrix.h>
+
+#include <mgba/internal/arm/macros.h>
+#include <mgba/internal/gba/gba.h>
+#include <mgba/internal/gba/memory.h>
+#include <mgba-util/vfs.h>
+
+static void _remapMatrix(struct GBA* gba) {
+	gba->romVf->seek(gba->romVf, gba->memory.matrix.paddr, SEEK_SET);
+	gba->romVf->read(gba->romVf, &gba->memory.rom[gba->memory.matrix.vaddr >> 2], gba->memory.matrix.size);
+}
+
+void GBAMatrixReset(struct GBA* gba) {
+	gba->memory.matrix.paddr = 0x200;
+	gba->memory.matrix.size = 0x1000;
+
+	gba->memory.matrix.vaddr = 0;
+	_remapMatrix(gba);
+	gba->memory.matrix.vaddr = 0x1000;
+	_remapMatrix(gba);
+
+	gba->memory.matrix.paddr = 0;
+	gba->memory.matrix.vaddr = 0;
+	gba->memory.matrix.size = 0x100;
+	_remapMatrix(gba);
+}
+
+void GBAMatrixWrite(struct GBA* gba, uint32_t address, uint32_t value) {
+	switch (address) {
+	case 0x0:
+		gba->memory.matrix.cmd = value;
+		switch (value) {
+		case 0x01:
+		case 0x11:
+			_remapMatrix(gba);
+			break;
+		default:
+			mLOG(GBA_MEM, STUB, "Unknown Matrix command: %08X", value);
+			break;
+		}
+		return;
+	case 0x4:
+		gba->memory.matrix.paddr = value & 0x03FFFFFF;
+		return;
+	case 0x8:
+		gba->memory.matrix.vaddr = value & 0x007FFFFF;
+		return;
+	case 0xC:
+		gba->memory.matrix.size = value << 9;
+		return;
+	}
+	mLOG(GBA_MEM, STUB, "Unknown Matrix write: %08X:%04X", address, value);
+}
+
+void GBAMatrixWrite16(struct GBA* gba, uint32_t address, uint16_t value) {
+	switch (address) {
+	case 0x0:
+		GBAMatrixWrite(gba, address, value | (gba->memory.matrix.cmd & 0xFFFF0000));
+		break;
+	case 0x4:
+		GBAMatrixWrite(gba, address, value | (gba->memory.matrix.paddr & 0xFFFF0000));
+		break;
+	case 0x8:
+		GBAMatrixWrite(gba, address, value | (gba->memory.matrix.vaddr & 0xFFFF0000));
+		break;
+	case 0xC:
+		GBAMatrixWrite(gba, address, value | (gba->memory.matrix.size & 0xFFFF0000));
+		break;
+	}
+}

src/gba/memory.c

@@ -137,6 +137,7 @@ void GBAMemoryReset(struct GBA* gba) {
 	}
 
 	GBADMAReset(gba);
+	memset(&gba->memory.matrix, 0, sizeof(gba->memory.matrix));
 }
 
 static void _analyzeForIdleLoop(struct GBA* gba, struct ARMCore* cpu, uint32_t address) {
@@ -748,6 +749,10 @@ uint32_t GBALoad8(struct ARMCore* cpu, uint32_t address, int* cycleCounter) {
 
 #define STORE_CART \
 	wait += waitstatesRegion[address >> BASE_OFFSET]; \
+	if (memory->matrix.size && (address & 0x01FFFF00) == 0x00800100) { \
+		GBAMatrixWrite(gba, address & 0x3C, value); \
+		break; \
+	} \
 	mLOG(GBA_MEM, STUB, "Unimplemented memory Store32: 0x%08X", address);
 
 #define STORE_SRAM \
@@ -867,6 +872,10 @@ void GBAStore16(struct ARMCore* cpu, uint32_t address, int16_t value, int* cycle
 			GBAHardwareGPIOWrite(&memory->hw, reg, value);
 			break;
 		}
+		if (memory->matrix.size && (address & 0x01FFFF00) == 0x00800100) {
+			GBAMatrixWrite16(gba, address & 0x3C, value);
+			break;
+		}
 		// Fall through
 	case REGION_CART0_EX:
 		if ((address & 0x00FFFFFF) >= AGB_PRINT_BASE) {