GuyPerfect/pvbemu
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Corrective tweaks

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GuyPerfect
2021-08-30 13:58:40 +00:00
parent b2adf1f9dc
commit 5a02e7e52d
7 changed files with 61 additions and 20 deletions
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core/bus.c
+3 -3
View File
@@ -5,7 +5,7 @@
/**************************** Component Functions ****************************/
/* Read a value from a memory buffer */
/* Read a data unit from a memory buffer */
static int32_t busReadMemory(uint8_t *mem, int type) {
/* Generic implementation */
@@ -39,7 +39,7 @@ static int32_t busRead(VB *emu, uint32_t address, int type, int debug) {
address &= ~((uint32_t) TYPE_SIZES[type] - 1);
/* Process by address range */
switch (address >> 24 ^ 7) {
switch (address >> 24 & 7) {
case 0 : return 0; /* VIP */
case 1 : debug = debug; return 0; /* VSU */
case 2 : return 0; /* Miscellaneous hardware */
@@ -84,7 +84,7 @@ static void busWriteMemory(uint8_t *mem, int type, int32_t value) {
}
/* Read a value from the bus */
/* Write a data unit to the bus */
static void busWrite(
VB *emu, uint32_t address, int type, uint32_t value, int debug) {
core/vb.c
+25 -2
View File
@@ -38,6 +38,20 @@ int32_t vbGetProgramRegister(VB *emu, int id) {
return id < 1 || id > 31 ? 0 : emu->cpu.program[id];
}
/* Retrieve the ROM buffer */
void* vbGetROM(VB *emu, uint32_t *size) {
if (size != NULL)
*size = emu->cart.romSize;
return emu->cart.rom;
}
/* Retrieve the SRAM buffer */
void* vbGetSRAM(VB *emu, uint32_t *size) {
if (size != NULL)
*size = emu->cart.sramSize;
return emu->cart.sram;
}
/* Retrieve the value of a system register */
uint32_t vbGetSystemRegister(VB *emu, int id) {
switch (id) {
@@ -76,8 +90,15 @@ uint32_t vbGetSystemRegister(VB *emu, int id) {
/* Prepare a simulation state instance for use */
void vbInit(VB *emu) {
emu->cart.rom = NULL;
emu->cart.sram = NULL;
/* Cartridge */
emu->cart.rom = NULL;
emu->cart.romSize = 0;
emu->cart.sram = NULL;
emu->cart.sramSize = 0;
/* All others */
vbReset(emu);
}
/* Read a data unit from the bus */
@@ -96,6 +117,8 @@ void vbReset(VB *emu) {
vbSetSystemRegister(emu, VB_PSW, 0x00008000);
/* Initialize extra CPU registers (the hardware does not do this) */
for (x = 0; x < 32; x++)
emu->cpu.program[x] = 0;
emu->cpu.adtre = 0;
emu->cpu.eipc = 0;
emu->cpu.eipsw = 0;
core/vb.h
+2
View File
@@ -114,6 +114,8 @@ struct VB {
VBAPI uint32_t vbGetProgramCounter (VB *emu);
VBAPI int32_t vbGetProgramRegister (VB *emu, int id);
VBAPI void* vbGetROM (VB *emu, uint32_t *size);
VBAPI void* vbGetSRAM (VB *emu, uint32_t *size);
VBAPI uint32_t vbGetSystemRegister (VB *emu, int id);
VBAPI void vbInit (VB *emu);
VBAPI int32_t vbRead (VB *emu, uint32_t address, int type, int debug);