DS: Basic memory support for RAM

src/ds/ds.c

@@ -129,6 +129,27 @@ void DS7Reset(struct ARMCore* cpu) {
 	cpu->gprs[ARM_SP] = DS7_SP_BASE_SVC;
 	ARMSetPrivilegeMode(cpu, MODE_SYSTEM);
 	cpu->gprs[ARM_SP] = DS7_SP_BASE;
+
+	struct DS* ds = (struct DS*) cpu->master;
+	DSMemoryReset(ds);
+
+	struct DSCartridge* header = ds->romVf->map(ds->romVf, sizeof(*header), MAP_READ);
+	if (header) {
+		// TODO: Error check
+		ds->romVf->seek(ds->romVf, header->arm7Offset, SEEK_SET);
+		uint32_t base = header->arm7Base - DS_BASE_RAM;
+		uint32_t* basePointer = &ds->memory.ram[base >> 2];
+		if (base < DS_SIZE_RAM && base + header->arm7Size <= DS_SIZE_RAM) {
+			ds->romVf->read(ds->romVf, basePointer, header->arm7Size);
+		}
+		cpu->gprs[12] = header->arm7Entry;
+		cpu->gprs[ARM_LR] = header->arm7Entry;
+		cpu->gprs[ARM_PC] = header->arm7Entry;
+		int currentCycles = 0;
+		ARM_WRITE_PC;
+
+		ds->romVf->unmap(ds->romVf, header, sizeof(*header));
+	}
 }
 
 void DS9Reset(struct ARMCore* cpu) {
@@ -140,7 +161,23 @@ void DS9Reset(struct ARMCore* cpu) {
 	cpu->gprs[ARM_SP] = DS9_SP_BASE;
 
 	struct DS* ds = (struct DS*) cpu->master;
-	DSMemoryReset(ds);
+	struct DSCartridge* header = ds->romVf->map(ds->romVf, sizeof(*header), MAP_READ);
+	if (header) {
+		// TODO: Error check
+		ds->romVf->seek(ds->romVf, header->arm9Offset, SEEK_SET);
+		uint32_t base = header->arm9Base - DS_BASE_RAM;
+		uint32_t* basePointer = &ds->memory.ram[base >> 2];
+		if (base < DS_SIZE_RAM && base + header->arm9Size <= DS_SIZE_RAM) {
+			ds->romVf->read(ds->romVf, basePointer, header->arm9Size);
+		}
+		cpu->gprs[12] = header->arm9Entry;
+		cpu->gprs[ARM_LR] = header->arm9Entry;
+		cpu->gprs[ARM_PC] = header->arm9Entry;
+		int currentCycles = 0;
+		ARM_WRITE_PC;
+
+		ds->romVf->unmap(ds->romVf, header, sizeof(*header));
+	}
 }
 
 static void DSProcessEvents(struct ARMCore* cpu) {
@@ -189,7 +226,6 @@ void DSDetachDebugger(struct DS* ds) {
 bool DSLoadROM(struct DS* ds, struct VFile* vf) {
 	DSUnloadROM(ds);
 	ds->romVf = vf;
-	// TODO: Checksum?
 	// TODO: error check
 	return true;
 }

src/ds/memory.c

@@ -5,8 +5,11 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include "memory.h"
 
+#include "arm/macros.h"
+
 #include "ds/ds.h"
 #include "util/math.h"
+#include "util/memory.h"
 
 mLOG_DEFINE_CATEGORY(DS_MEM, "DS Memory");
 
@@ -161,14 +164,29 @@ static void DS7SetActiveRegion(struct ARMCore* cpu, uint32_t address) {
 
 	memory->activeRegion7 = newRegion;
 	switch (newRegion) {
-	case DS7_REGION_BIOS:
+	case DS_REGION_RAM:
-		cpu->memory.activeRegion = memory->bios7;
+		if ((address & (DS_SIZE_RAM - 1)) < DS_SIZE_RAM) {
-		cpu->memory.activeMask = DS7_SIZE_BIOS - 1;
+			cpu->memory.activeRegion = memory->ram;
-		break;
+			cpu->memory.activeMask = DS_SIZE_RAM - 1;
-	default:
-		mLOG(DS_MEM, FATAL, "Jumped to invalid address: %08X", address);
 			return;
 		}
+		break;
+	case DS7_REGION_BIOS:
+		if (memory->bios7) {
+			cpu->memory.activeRegion = memory->bios9;
+			cpu->memory.activeMask = DS9_SIZE_BIOS - 1;
+		} else {
+			cpu->memory.activeRegion = _deadbeef;
+			cpu->memory.activeMask = 0;
+		}
+		return;
+	default:
+		break;
+	}
+	cpu->memory.activeRegion = _deadbeef;
+	cpu->memory.activeMask = 0;
+	mLOG(DS_MEM, FATAL, "Jumped to invalid address: %08X", address);
+	return;
 }
 
 uint32_t DS7Load32(struct ARMCore* cpu, uint32_t address, int* cycleCounter) {
@@ -178,6 +196,11 @@ uint32_t DS7Load32(struct ARMCore* cpu, uint32_t address, int* cycleCounter) {
 	int wait = 0;
 
 	switch (address >> DS_BASE_OFFSET) {
+	case DS_REGION_RAM:
+		if ((address & (DS_SIZE_RAM - 1)) < DS_SIZE_RAM) {
+			LOAD_32(value, address & (DS_SIZE_RAM - 1), memory->ram);
+		}
+		break;
 	default:
 		break;
 	}
@@ -321,7 +344,7 @@ uint32_t DS7LoadMultiple(struct ARMCore* cpu, uint32_t address, int mask, enum L
 
 
 uint32_t DS7StoreMultiple(struct ARMCore* cpu, uint32_t address, int mask, enum LSMDirection direction, int* cycleCounter) {
-	struct DS* ds = (struct ds*) cpu->master;
+	struct DS* ds = (struct DS*) cpu->master;
 	struct DSMemory* memory = &ds->memory;
 	uint32_t value;
 	int wait = 0;
@@ -368,8 +391,15 @@ static void DS9SetActiveRegion(struct ARMCore* cpu, uint32_t address) {
 
 	int newRegion = address >> DS_BASE_OFFSET;
 
-	memory->activeRegion7 = newRegion;
+	memory->activeRegion9 = newRegion;
 	switch (newRegion) {
+	case DS_REGION_RAM:
+		if ((address & (DS_SIZE_RAM - 1)) < DS_SIZE_RAM) {
+			cpu->memory.activeRegion = memory->ram;
+			cpu->memory.activeMask = DS_SIZE_RAM - 1;
+			return;
+		}
+		break;
 	case DS9_REGION_BIOS:
 		// TODO: Mask properly
 		if (memory->bios9) {
@@ -379,11 +409,14 @@ static void DS9SetActiveRegion(struct ARMCore* cpu, uint32_t address) {
 			cpu->memory.activeRegion = _deadbeef;
 			cpu->memory.activeMask = 0;
 		}
-		break;
+		return;
 	default:
+		break;
+	}
+	cpu->memory.activeRegion = _deadbeef;
+	cpu->memory.activeMask = 0;
 	mLOG(DS_MEM, FATAL, "Jumped to invalid address: %08X", address);
 	return;
-	}
 }
 
 uint32_t DS9Load32(struct ARMCore* cpu, uint32_t address, int* cycleCounter) {
@@ -393,6 +426,11 @@ uint32_t DS9Load32(struct ARMCore* cpu, uint32_t address, int* cycleCounter) {
 	int wait = 0;
 
 	switch (address >> DS_BASE_OFFSET) {
+	case DS_REGION_RAM:
+		if ((address & (DS_SIZE_RAM - 1)) < DS_SIZE_RAM) {
+			LOAD_32(value, address & (DS_SIZE_RAM - 1), memory->ram);
+		}
+		break;
 	default:
 		break;
 	}
@@ -536,7 +574,7 @@ uint32_t DS9LoadMultiple(struct ARMCore* cpu, uint32_t address, int mask, enum L
 
 
 uint32_t DS9StoreMultiple(struct ARMCore* cpu, uint32_t address, int mask, enum LSMDirection direction, int* cycleCounter) {
-	struct DS* ds = (struct ds*) cpu->master;
+	struct DS* ds = (struct DS*) cpu->master;
 	struct DSMemory* memory = &ds->memory;
 	uint32_t value;
 	int wait = 0;