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Laying groundwork for emulation, re-implementing memory bus

This commit is contained in:
Guy Perfect 2020-08-09 18:35:57 -05:00
parent f8f4005e02
commit a98c35ee8e
15 changed files with 583 additions and 446 deletions
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140
src/core/bus.c
View File

@ -1,140 +0,0 @@
/* This file is included through vue.c and cannot be built directly. */
#ifdef VUEAPI
/* Read bytes from host memory */
static void busReadBytes(uint8_t *src, uint8_t *dest, uint32_t address,
uint32_t size, uint32_t length) {
/* There is no source data */
if (src == NULL)
while (length-- > 0)
*dest++ = 0;
/* Copy bytes from the source as a circular buffer */
else for (size--; length-- > 0;)
*dest++ = src[address++ & size];
}
/* Read a value directly from host memory */
static int32_t busReadMemory(uint8_t *data, uint32_t offset, int type) {
int32_t value; /* Value read */
/* There is no source data */
if (data == NULL)
return 0;
/* Locate the value */
data = &data[offset];
/* Read the value */
switch (type) {
case VUE_S8 : value = *(int8_t *)data; break;
case VUE_U8 : value = *(uint8_t *)data; break;
case VUE_S16: value = *(int16_t *)data; break;
case VUE_U16: value = *(uint16_t *)data; break;
case VUE_S32: value = *(int32_t *)data; break;
}
/* Host memory is big-endian */
#ifdef VUE_BIGENDIAN
switch (type) {
case VUE_S32:
value = (value >> 16 & 0x0000FFFF) | value << 16;
/* Fallthrough */
case VUE_S16:
case VUE_U16:
value = (value >> 8 & 0x00FF00FF) | (value << 8 & 0xFF00FF00);
break;
}
#endif
return value;
}
/* Read a value from the CPU bus */
static int32_t busReadValue(VUE *vue, uint32_t address, int type) {
address &= -TYPE_SIZES[type];
switch (address >> 24 & 7) {
case 1: /* Fallthrough */ /* VSU (write-only) */
case 3: /* Fallthrough */ /* Unmapped */
case 4: /* Cartridge expansion (not supported) */
return 0;
case 5: /* System WRAM */
return busReadMemory(vue->bus.wram, address & 0xFFFF, type);
case 6: return busReadMemory(vue->bus.sram, /* Cartridge RAM */
address & (vue->bus.sramSize - 1), type);
case 7: return busReadMemory(vue->bus.rom , /* Cartridge ROM */
address & (vue->bus.romSize - 1), type);
}
return 0; /* Unreachable */
}
/* Perform a system reset */
static void busReset(VUE *vue) {
int x;
for (x = 0; x < 0x10000; x++)
vue->bus.wram[x] = 0;
}
/* Write bytes to host memory */
static void busWriteBytes(uint8_t *dest, uint8_t *src, uint32_t address,
uint32_t size, uint32_t length) {
if (dest != NULL)
for (size--; length-- > 0;)
dest[address++ & size] = *src++;
}
/* Write a value directly to host memory */
static void busWriteMemory(uint8_t *data, uint32_t offset, int type,
int32_t value) {
/* There is no destination data */
if (data == NULL)
return;
/* Locate the value */
data = &data[offset];
/* Host memory is big-endian */
#ifdef VUE_BIGENDIAN
switch (type) {
case VUE_S32:
value = (value >> 16 & 0x0000FFFF) | value << 16;
/* Fallthrough */
case VUE_S16:
case VUE_U16:
value = (value >> 8 & 0x00FF00FF) | (value << 8 & 0xFF00FF00);
break;
}
#endif
/* Write the value */
switch (type) {
case VUE_S8 : /* Fallthrough */
case VUE_U8 : *(uint8_t *)data = (uint8_t) value; break;
case VUE_S16: /* Fallthrough */
case VUE_U16: *(uint16_t *)data = (int16_t) value; break;
case VUE_S32: *(int32_t *)data = (int32_t) value; break;
}
}
/* Write a value to the CPU bus */
static void busWriteValue(VUE *vue, uint32_t address, int type, int32_t value){
address &= -TYPE_SIZES[type];
switch (address >> 24 & 7) {
case 5: /* System WRAM */
busWriteMemory(vue->bus.wram, address & 0xFFFF, type, value);
break;
case 6: /* Cartridge RAM */
busWriteMemory(vue->bus.sram,
address & (vue->bus.sramSize - 1), type, value);
break;
case 7: /* Cartridge ROM */
busWriteMemory(vue->bus.rom ,
address & (vue->bus.romSize - 1), type, value);
break;
}
}
#endif /* VUEAPI */

10
src/core/cpu.c
View File

@ -124,7 +124,7 @@ static void cpuDecode(VUE_INST *inst, int32_t bits) {
}
/* Read a system register */
static int32_t cpuGetSystemRegister(VUE *vue, int index) {
static int32_t cpuGetSystemRegister(VUE *vue, int32_t index) {
switch (index) {
case VUE_ADTRE: return vue->cpu.adtre;
case VUE_EIPC : return vue->cpu.eipc;
@ -159,7 +159,7 @@ static int32_t cpuGetSystemRegister(VUE *vue, int index) {
}
/* Write a system register */
static int32_t cpuSetSystemRegister(VUE *vue, int index, int32_t value,
static int32_t cpuSetSystemRegister(VUE *vue, int32_t index, int32_t value,
vbool debug) {
switch (index) {
case VUE_ADTRE: return vue->cpu.adtre = value & 0xFFFFFFFE;
@ -225,9 +225,9 @@ static int32_t cpuSetSystemRegister(VUE *vue, int index, int32_t value,
return 1; /* Unreachable */
}
/* Perform a system reset */
/* System reset */
static void cpuReset(VUE *vue) {
int x;
int32_t x;
/* Configure instance fields */
vue->cpu.cycles = 0; /* Duration of first fetch */
@ -251,7 +251,7 @@ static void cpuReset(VUE *vue) {
}
/* Test a condition */
static int8_t cpuTest(VUE *vue, int condition) {
static int8_t cpuTest(VUE *vue, int32_t condition) {
switch (condition) {
case 0: return vue->cpu.psw_ov;
case 1: return vue->cpu.psw_cy;

14
src/core/gamepak.c Normal file
View File

@ -0,0 +1,14 @@
/* This file is included through vue.c and cannot be built directly. */
#ifdef VUEAPI
/*****************************************************************************
* Module Functions *
*****************************************************************************/
/* System reset */
static void pakReset(VUE *vue) {
vue->pak.wcr_exp1w = 0;
vue->pak.wcr_rom1w = 0;
}
#endif

32
src/core/include/vue.h
View File

@ -159,19 +159,12 @@ typedef struct {
/* Emulation state */
typedef struct {
VUE_INST inst; /* Instruction state */
/* Memory bus */
struct {
uint8_t *rom; /* Cartridge ROM */
uint32_t romSize; /* Number of bytes in cartridge ROM */
uint8_t *sram; /* Cartridge RAM */
uint32_t sramSize; /* Number of bytes in cartridge RAM */
int32_t breakCode; /* Application break code */
uint8_t wram[0x10000]; /* System memory */
} bus;
/* CPU state */
struct {
VUE_INST inst; /* Instruction state */
uint32_t cycles; /* Cycles until next stage */
int32_t jumpFrom[3]; /* Source PCs of most recent jumps */
int32_t jumpTo [3]; /* Destination PCs of most recent jumps */
@ -222,6 +215,16 @@ typedef struct {
uint16_t ecr_fecc; /* Fatal Error Cause Code */
} cpu;
/* Game pak */
struct {
uint8_t *ram; /* Cartridge SRAM */
uint32_t ramSize; /* Number of bytes in cartridge SRAM */
uint8_t *rom; /* Cartridge ROM */
uint32_t romSize; /* Number of bytes in cartridge ROM */
int8_t wcr_exp1w; /* Expansion one-wait mode */
int8_t wcr_rom1w; /* ROM one-wait mode */
} pak;
} VUE;
@ -230,13 +233,16 @@ typedef struct {
* Function Prototypes *
*****************************************************************************/
VUEAPI int32_t vueGetRegister(VUE *vue, int index, vbool system);
VUEAPI int32_t vueEmulate (VUE *vue, int32_t maxCycles);
VUEAPI int32_t vueGetRegister(VUE *vue, int32_t index, vbool system);
VUEAPI void vueInitialize (VUE *vue);
VUEAPI vbool vueRead (VUE *vue, uint32_t address, uint8_t *dest, uint32_t length);
VUEAPI int32_t vueRead (VUE *vue, uint32_t address, int32_t type);
VUEAPI vbool vueReadBytes (VUE *vue, uint32_t address, uint8_t *dest, uint32_t length);
VUEAPI void vueReset (VUE *vue);
VUEAPI int32_t vueSetRegister(VUE *vue, int index, vbool system, int32_t value);
VUEAPI int32_t vueSetRegister(VUE *vue, int32_t index, vbool system, int32_t value);
VUEAPI vbool vueSetROM (VUE *vue, uint8_t *rom, uint32_t size);
VUEAPI vbool vueWrite (VUE *vue, uint32_t address, uint8_t *src, uint32_t length);
VUEAPI void vueWrite (VUE *vue, uint32_t address, int32_t type, int32_t value);
VUEAPI vbool vueWriteBytes (VUE *vue, uint32_t address, uint8_t *src, uint32_t length);

281
src/core/vue.c
View File

@ -18,7 +18,7 @@
*****************************************************************************/
/* Memory access type sizes */
static const int TYPE_SIZES[] = { 1, 1, 2, 2, 4 };
static const uint32_t TYPE_SIZES[] = { 1, 1, 2, 2, 4 };
@ -26,8 +26,132 @@ static const int TYPE_SIZES[] = { 1, 1, 2, 2, 4 };
* Component Includes *
*****************************************************************************/
#include "bus.c"
#include "cpu.c"
#include "gamepak.c"
/*****************************************************************************
* Module Functions *
*****************************************************************************/
/* Read a value from a byte buffer */
static int32_t readBuffer(uint8_t *data, uint32_t datlen, uint32_t address,
int32_t type) {
uint32_t size = TYPE_SIZES[type]; /* Size of data type */
int32_t value = 0;
/* Error checking */
if (data == NULL)
return 0;
/* Common processing */
address &= (~size + 1) & (datlen - 1);
/* The host is little-endian */
#ifndef VUE_BIGENDIAN
switch (type) {
case VUE_S8 : value = *( int8_t *)&data[address]; break;
case VUE_U8 : value = *(uint8_t *)&data[address]; break;
case VUE_S16: value = *( int16_t *)&data[address]; break;
case VUE_U16: value = *(uint16_t *)&data[address]; break;
case VUE_S32: value = *( int32_t *)&data[address]; break;
}
/* The host is big-endian */
#else
switch (type) {
case VUE_S32: value =
data[address + 3] << 24 |
(data[address + 2] & 0xFF) << 16;
/* Fallthrough */
case VUE_S16: /* Fallthrough */
case VUE_U16: value |=
(data[address + 1] & 0xFF) << 8;
/* Fallthrough */
case VUE_S8 : /* Fallthrough */
case VUE_U8 : value |=
data[address ] & 0xFF;
}
/* Sign-extend the value if appropriate */
if (type & 1) {
size <<= 3;
value = SIGN_EXTEND(size, value);
}
#endif
return value;
}
/* Read bytes from a byte buffer */
static void readBytes(uint8_t *data, uint32_t datlen, uint32_t address,
uint8_t *dest, uint32_t length) {
/* The source does not exist */
if (data == NULL) {
while (length--)
*dest++ = 0;
return;
}
/* Transfer bytes from the source as a circular buffer */
while (length--)
*dest++ = data[address++ & (datlen - 1)];
}
/* Write a value to a byte buffer */
static void writeBuffer(uint8_t *data, uint32_t datlen, uint32_t address,
int32_t type, int32_t value) {
uint32_t size = TYPE_SIZES[type]; /* Size of data type */
/* Error checking */
if (data == NULL)
return;
/* Common processing */
address &= (~size + 1) & (datlen - 1);
/* The host is little-endian */
#ifndef VUE_BIGENDIAN
switch (type) {
case VUE_S8 : /* Fallthrough */
case VUE_U8 : *(int8_t *)&data[address] = (int8_t ) value; break;
case VUE_S16: /* Fallthrough */
case VUE_U16: *(int16_t *)&data[address] = (int16_t ) value; break;
case VUE_S32: *(int32_t *)&data[address] = (int32_t ) value; break;
}
/* The host is big-endian */
#else
switch (type) {
case VUE_S32:
data[address + 3] = (uint8_t) (value >> 24);
data[address + 2] = (uint8_t) (value >> 16);
/* Fallthrough */
case VUE_S16: /* Fallthrough */
case VUE_U16:
data[address + 1] = (uint8_t) (value >> 8);
/* Fallthrough */
case VUE_S8 : /* Fallthrough */
case VUE_U8 : value |=
data[address ] = (uint8_t) value;
}
#endif
}
/* Write bytes to a byte buffer */
static void writeBytes(uint8_t *data, uint32_t datlen, uint32_t address,
uint8_t *src, uint32_t length) {
/* The destination does not exist */
if (data == NULL)
return;
/* Transfer bytes to the destination as a circular buffer */
while (length--)
data[address++ & (datlen - 1)] = *src++;
}
@ -35,8 +159,47 @@ static const int TYPE_SIZES[] = { 1, 1, 2, 2, 4 };
* Library Functions *
*****************************************************************************/
/* Process the simulation */
int32_t vueEmulate(VUE *vue, int32_t maxCycles) {
int32_t cycles; /* Number of cycles to process */
/* Process up to the given number of cycles */
do {
/* Determine the number of cycles during which nothing will happen */
cycles = maxCycles;
/*cycles = cpuUntil (vue, cycles);*/
/*cycles = padUntil (vue, cycles);*/
/*cycles = linkUntil (vue, cycles);*/
/*cycles = timerUntil(vue, cycles);*/
/*cycles = vipUntil (vue, cycles);*/
/*cycles = vsuUntil (vue, cycles);*/
/* Process all system components */
vue->breakCode = 0;
/*gamePad.emulate(cycles);*/
/*gamePak.emulate(cycles);*/
/*link .emulate(cycles);*/
/*timer .emulate(cycles);*/
/*vip .emulate(cycles);*/
/*vsu .emulate(cycles);*/
/*cpu .emulate(cycles);*/
/* An application break was requested */
if (vue->breakCode != 0)
break;
/* Update the number of cycles remaining */
if (maxCycles >= 0)
maxCycles -= cycles;
} while (maxCycles != 0);
/* A break condition has occurred */
return maxCycles;
}
/* Retrieve the value of a register */
int32_t vueGetRegister(VUE *vue, int index, vbool system) {
int32_t vueGetRegister(VUE *vue, int32_t index, vbool system) {
/* Error checking */
if (vue == NULL)
@ -63,12 +226,22 @@ int32_t vueGetRegister(VUE *vue, int index, vbool system) {
void vueInitialize(VUE *vue) {
if (vue == NULL)
return;
vue->bus.rom = NULL;
vue->bus.sram = NULL;
vue->pak.ram = NULL;
vue->pak.rom = NULL;
}
/* Read a value from the CPU bus */
int32_t vueRead(VUE *vue, uint32_t address, int32_t type) {
switch (address >> 24 & 7) {
case 5: return readBuffer(vue->wram , 0x10000,address,type);
case 6: return readBuffer(vue->pak.ram,vue->pak.ramSize,address,type);
case 7: return readBuffer(vue->pak.rom,vue->pak.romSize,address,type);
}
return 0;
}
/* Read bytes from the CPU bus */
vbool vueRead(VUE *vue, uint32_t address, uint8_t *dest, uint32_t length) {
vbool vueReadBytes(VUE *vue, uint32_t address, uint8_t *dest, uint32_t length){
uint32_t count; /* Bytes to read in one iteration */
/* Error checking */
@ -76,45 +249,46 @@ vbool vueRead(VUE *vue, uint32_t address, uint8_t *dest, uint32_t length) {
return VUE_FALSE;
/* Perform the operation */
for (; length > 0; address += count, length -= count, dest += count) {
/* Determine the maximum number of bytes to process at once */
while (length > 0) {
count = 0x01000000 - (address & 0x00FFFFFF);
if (count > length)
if (length < count)
count = length;
/* Process by component */
switch (address >> 24 & 7) {
case 1: /* Fallthrough */ /* VSU (write-only) */
case 3: /* Fallthrough */ /* Unmapped */
case 4: /* Cartridge expansion (not supported) */
busReadBytes(NULL, dest, address, 0, count);
break;
case 5: busReadBytes(vue->bus.wram, dest, /* System WRAM */
address, 0x10000 , count);
break;
case 6: busReadBytes(vue->bus.sram, dest, /* Cartridge RAM */
address, vue->bus.sramSize, count);
break;
case 7: busReadBytes(vue->bus.rom , dest, /* Cartridge ROM */
address, vue->bus.romSize , count);
break;
case 5: readBytes(vue->wram , 0x10000,
address, dest, count); break;
case 6: readBytes(vue->pak.ram, vue->pak.ramSize,
address, dest, count); break;
case 7: readBytes(vue->pak.rom, vue->pak.romSize,
address, dest, count); break;
default:
for (address += count, length -= count; count--;)
*dest++ = 0;
continue;
}
address += count;
length -= count;
dest += count;
}
};
return VUE_TRUE;
}
/* Initialize all system components */
void vueReset(VUE *vue) {
uint32_t x; /* Iterator */
/* Error checking */
if (vue == NULL)
return;
busReset(vue);
/* Reset state */
cpuReset(vue);
pakReset(vue);
for (x = 0; x < 0x1000; x++)
vue->wram[x] = 0;
}
/* Specify a value for a register */
int32_t vueSetRegister(VUE *vue, int index, vbool system, int32_t value) {
int32_t vueSetRegister(VUE *vue, int32_t index, vbool system, int32_t value) {
return vue == NULL ? 0 :
index == VUE_PC && system ? vue->cpu.pc = value & 0xFFFFFFFE :
index < 0 || index > 31 ? 0 :
@ -135,13 +309,25 @@ vbool vueSetROM(VUE *vue, uint8_t *rom, uint32_t size) {
) return VUE_FALSE;
/* Accept the new ROM buffer */
vue->bus.rom = rom;
vue->bus.romSize = size;
vue->pak.rom = rom;
vue->pak.romSize = size;
return VUE_TRUE;
}
/* Write a value to the CPU bus */
void vueWrite(VUE *vue, uint32_t address, int32_t type, int32_t value) {
switch (address >> 24 & 7) {
case 5: writeBuffer(vue->wram , 0x1000,
address, type, value); break;
case 6: writeBuffer(vue->pak.ram, vue->pak.ramSize,
address, type, value); break;
case 7: writeBuffer(vue->pak.rom, vue->pak.romSize,
address, type, value); break;
}
}
/* Write bytes to the CPU bus */
vbool vueWrite(VUE *vue, uint32_t address, uint8_t *src, uint32_t length) {
vbool vueWriteBytes(VUE *vue, uint32_t address, uint8_t *src, uint32_t length){
uint32_t count; /* Bytes to write in one iteration */
/* Error checking */
@ -149,26 +335,21 @@ vbool vueWrite(VUE *vue, uint32_t address, uint8_t *src, uint32_t length) {
return VUE_FALSE;
/* Perform the operation */
for (; length > 0; address += count, length -= count, src += count) {
/* Determine the maximum number of bytes to process at once */
while (length > 0) {
count = 0x01000000 - (address & 0x00FFFFFF);
if (count > length)
if (length < count)
count = length;
/* Process by component */
switch (address >> 24 & 7) {
case 5: /* System WRAM */
busWriteBytes(vue->bus.wram, src, address, 0x10000, count);
break;
case 6: busWriteBytes(vue->bus.sram, src, /* Cartridge RAM */
address, vue->bus.sramSize, count);
break;
case 7: busWriteBytes(vue->bus.rom , src, /* Cartridge ROM */
address, vue->bus.romSize , count);
break;
case 5: writeBytes(vue->wram , 0x10000,
address, src, count); break;
case 6: writeBytes(vue->pak.ram, vue->pak.ramSize,
address, src, count); break;
case 7: writeBytes(vue->pak.rom, vue->pak.ramSize,
address, src, count); break;
}
address += count;
length -= count;
src += count;
}
};
return VUE_TRUE;
}

8
src/desktop/app/DisassemblerPane.java
View File

@ -144,7 +144,7 @@ class DisassemblerPane extends JScrollPane {
int offset = 0;
// Disassemble from the current address
vue.read(address, data, 0, data.length);
vue.readBytes(address, data, 0, data.length);
widths[3] = widths[4] = 0;
for (int y = 0; y < count; y++) {
var row = y < rows.size() ? rows.get(y) : addRow();
@ -248,7 +248,7 @@ class DisassemblerPane extends JScrollPane {
target &= 0xFFFFFFFE;
// Load enough bytes to represent every fully visible instruction
vue.read(address, data, 0, data.length);
vue.readBytes(address, data, 0, data.length);
// Iterate through instructions
for (int x = 0, address = this.address; x < count; x++) {
@ -283,7 +283,7 @@ class DisassemblerPane extends JScrollPane {
// Load bytes starting up to 8 instructions prior to the target
address = target - 32;
vue.read(address, data, 0, data.length);
vue.readBytes(address, data, 0, data.length);
// Iterate through instructions
for (boolean found = false;;) {
@ -310,7 +310,7 @@ class DisassemblerPane extends JScrollPane {
// Load bytes starting up to 8 instructions prior to the top row
address = target - data.length + 4;
vue.read(address, data, 0, data.length);
vue.readBytes(address, data, 0, data.length);
// Iterate through instructions
var addresses = new int[row]; // Circular buffer

3
src/desktop/app/MainWindow.java
View File

@ -65,7 +65,8 @@ class MainWindow extends JFrame {
this.app = app;
pwd = Util.PWD;
vue = VUE.create(app.getUseNative());
System.out.println("Native: " + (vue.isNative() ? "Yes" : "No"));
System.out.println("Native: " +
(vue.isNative() ? VUE.getNativeID() : "No"));
// Configure video pane
video = new JPanel(null) {

2
src/desktop/app/MemoryWindow.java
View File

@ -87,7 +87,7 @@ class MemoryWindow extends ChildWindow {
var data = new byte[count * 16];
// Retrieve all visible bytes from the emulation context
parent.vue.read(address, data, 0, data.length);
parent.vue.readBytes(address, data, 0, data.length);
// Update visible rows
for (int x = 0; x < count; x++) {

147
src/desktop/vue/Bus.java
View File

@ -1,147 +0,0 @@
package vue;
// Java imports
import java.util.*;
// Simulation of the CPU bus
class Bus {
// Private fields
private JavaVUE vue; // Emulation state
// Package fields
byte[] rom; // Cartridge ROM
byte[] sram; // Cartridge SRAM
byte[] wram; // System WRAM
///////////////////////////////////////////////////////////////////////////
// Constructors //
///////////////////////////////////////////////////////////////////////////
// Default constructor
Bus(JavaVUE vue) {
this.vue = vue;
wram = new byte[0x10000];
}
// Read bytes from host memory
void readBytes(byte[] src,byte[] dest,int address,int offset,int length) {
// There is no source data
if (src == null) {
Arrays.fill(dest, offset, offset + length, (byte) 0);
return;
}
// Copy bytes from the source as a circular buffer
int count = 0; // Bytes to process in one iteration
for (; length > 0; address += count, length -= count, offset += count){
int from = address & src.length - 1;
count = Math.min(length, src.length - from);
System.arraycopy(src, from, dest, offset, count);
}
}
// Read a value directly from host memory
int readMemory(byte[] data, int address, int type) {
// There is no source data
if (data == null)
return 0;
// Processing by type
address &= data.length - 1;
switch (type) {
case VUE.S8 : return data[address];
case VUE.U8 : return data[address] & 0xFF;
case VUE.S16: return
data[address+1] << 8 | data[address ] & 0xFF;
case VUE.U16: return
(data[address+1] & 0xFF)<< 8 | data[address ] & 0xFF;
case VUE.S32: return
data[address+3] <<24 | (data[address+2] & 0xFF)<<16 |
(data[address+1] & 0xFF)<< 8 | (data[address ] & 0xFF);
}
return 0; // Unreachable
}
// Read a value from the CPU bus
int readValue(int address, int type) {
address &= ~JavaVUE.TYPE_SIZES[type] + 1;
switch (address >> 24 & 7) {
case 1: // Fallthrough, VSU (write-only)
case 3: // Fallthrough, unmapped
case 4: // Cartridge expansion (not supported)
return 0;
case 5: return
readMemory(wram, address & 0xFFFF , type);
case 6: return
readMemory(sram, address & sram.length - 1, type);
case 7: return
readMemory(rom , address & rom .length - 1, type);
}
return 0; // Unreachable
}
// Perform a system reset
public void reset() {
Arrays.fill(wram, 0, 0x10000, (byte) 0);
}
// Write bytes to host memory
void writeBytes(byte[] dest,byte[] src,int address,int offset,int length) {
// There is no destination data
if (dest != null)
return;
// Copy bytes to the destination as a circular buffer
int count = 0; // Bytes to process in one iteration
for (; length > 0; address += count, length -= count, offset += count){
int to = address & dest.length - 1;
count = Math.min(length, dest.length - to);
System.arraycopy(src, offset, dest, to, count);
}
}
// Write a value directly to host memory
void writeMemory(byte[] data, int address, int type, int value) {
// There is no source data
if (data == null)
return;
// Processing by type
address &= data.length - 1;
switch (type) {
case VUE.S32:
data[address + 3] = (byte) (value >> 24);
data[address + 2] = (byte) (value >> 16);
// Fallthrough
case VUE.S16: // Fallthrough
case VUE.U16:
data[address + 1] = (byte) (value >> 8);
// Fallthrough
case VUE.S8 : // Fallthrough
case VUE.U8 :
data[address ] = (byte) value ;
}
}
// Write a value to the CPU bus
void writeValue(int address, int type, int value) {
address &= ~JavaVUE.TYPE_SIZES[type] + 1;
switch (address >> 24 & 7) {
case 5: writeMemory(wram, address, type, value); break;
case 6: writeMemory(sram, address, type, value); break;
case 7: writeMemory(rom , address, type, value); break;
}
}
}

1
src/desktop/vue/CPU.java
View File

@ -12,6 +12,7 @@ class CPU {
// Package fields
int cycles; // Cycles until next stage
int fetch; // Fetch unit index
Instruction inst; // Instruction state
int[] jumpFrom; // Source PCs of most recent jumps
int[] jumpTo; // Destination PCs of most recent jumps
int stage; // Current processing stage

38
src/desktop/vue/GamePak.java Normal file
View File

@ -0,0 +1,38 @@
package vue;
// Simulation of the Game Pak
class GamePak {
// Package fields
byte[] ram; // Cartridge SRAM
byte[] rom; // Cartridge ROM
int wcr_exp1w; // Expansion one-wait mode
int wcr_rom1w; // ROM one-wait mode
// Private fields
private JavaVUE vue; // Emulation state
///////////////////////////////////////////////////////////////////////////
// Constructors //
///////////////////////////////////////////////////////////////////////////
// Default constructor
GamePak(JavaVUE vue) {
this.vue = vue;
}
///////////////////////////////////////////////////////////////////////////
// Package Methods //
///////////////////////////////////////////////////////////////////////////
// System reset
void reset() {
wcr_exp1w = 0;
wcr_rom1w = 0;
}
}

260
src/desktop/vue/JavaVUE.java
View File

@ -1,14 +1,18 @@
package vue;
// Java imports
import java.util.*;
// Java emulation core implementation
class JavaVUE extends VUE {
// Instance fields
Instruction inst; // Instruction state
// State fields
int breakCode; // Application break code
byte[] wram; // System WRAM
// Components
Bus bus; // Memory bus
// Package fields
CPU cpu; // Processor
GamePak pak; // Game pak
@ -27,9 +31,9 @@ class JavaVUE extends VUE {
// Default constructor
JavaVUE() {
bus = new Bus(this);
cpu = new CPU (this);
inst = new Instruction();
pak = new GamePak(this);
wram = new byte[0x10000];
reset();
}
@ -42,6 +46,43 @@ class JavaVUE extends VUE {
// Release any used resources
public void dispose() { }; // No action needed
// Process the simulation
public int emulate(int maxCycles) {
// Process up to the given number of cycles
do {
// Determine the number of cycles during which nothing will happen
int cycles = maxCycles;
//cycles = cpu .until(cycles);
//cycles = pad .until(cycles);
//cycles = link .until(cycles);
//cycles = timer.until(cycles);
//cycles = vip .until(cycles);
//cycles = vsu .until(cycles);
// Process all system components
breakCode = 0;
//pad .emulate(cycles);
//link .emulate(cycles);
//timer.emulate(cycles);
//vip .emulate(cycles);
//vsu .emulate(cycles);
//cpu .emulate(cycles);
// An application break was requested
if (breakCode != 0)
break;
// Update the number of cycles remaining
if (maxCycles >= 0)
maxCycles -= cycles;
} while (maxCycles != 0);
// A break condition has occurred
return maxCycles;
}
// Retrieve a register value
public int getRegister(int index, boolean system) {
@ -66,12 +107,12 @@ class JavaVUE extends VUE {
public byte[] getROM() {
// No ROM data
if (bus.rom == null)
if (pak.rom == null)
return null;
// Copy the ROM data
var ret = new byte[bus.rom.length];
System.arraycopy(bus.rom, 0, ret, 0, ret.length);
var ret = new byte[pak.rom.length];
System.arraycopy(pak.rom, 0, ret, 0, ret.length);
return ret;
}
@ -80,9 +121,18 @@ class JavaVUE extends VUE {
return false;
}
// Read a value from the CPU bus
public int read(int address, int type) {
switch (address >> 24 & 7) {
case 5: return readBuffer(wram , address, type);
case 6: return readBuffer(pak.ram, address, type);
case 7: return readBuffer(pak.rom, address, type);
}
return 0;
}
// Read bytes from the CPU bus
public boolean read(int address, byte[] dest, int offset, int length) {
int count = 0; // Bytes to read in one iteration
public boolean readBytes(int address, byte[] dest, int offset, int length){
// Error checking
if (
@ -93,40 +143,26 @@ class JavaVUE extends VUE {
) return false;
// Perform the operation
for (; length > 0; address += count, length -= count, offset += count){
// Determine the maximum number of bytes to process at once
count = Math.min(length, 0x01000000 - (address & 0x00FFFFFF));
// Process by component
while (length > 0) {
int count = Math.min(length, 0x01000000 - (address & 0x00FFFFFF));
switch (address >> 24 & 7) {
case 1: // VSU
// Will support debug reads
bus.readBytes(null, dest, address, 0 , count);
break;
case 3: // Fallthrough, unmapped
case 4: // Cartridge expansion (not supported)
bus.readBytes(null , dest, address, 0 , count);
break;
case 5: /* System WRAM */
bus.readBytes(bus.wram, dest, address, offset, count);
break;
case 6: /* Cartridge RAM */
bus.readBytes(bus.sram, dest, address, offset, count);
break;
case 7: /* Cartridge ROM */
bus.readBytes(bus.rom , dest, address, offset, count);
break;
case 5: readBytes(wram ,address,dest,offset,count); break;
case 6: readBytes(pak.ram,address,dest,offset,count); break;
case 7: readBytes(pak.rom,address,dest,offset,count); break;
default: Arrays.fill(dest, offset, offset + count, (byte) 0);
}
address += count;
length -= count;
offset += count;
}
};
return true;
}
// Initialize all system components
public void reset() {
bus.reset();
cpu.reset();
pak.reset();
Arrays.fill(wram, 0, 0x10000, (byte) 0);
}
// Specify a register value
@ -152,14 +188,22 @@ class JavaVUE extends VUE {
) return false;
// Accept the new ROM data
bus.rom = new byte[length];
System.arraycopy(data, offset, bus.rom, 0, length);
pak.rom = new byte[length];
System.arraycopy(data, offset, pak.rom, 0, length);
return true;
}
// Write a value to the CPU bus
public void write(int address, int type, int value) {
switch (address >> 24 & 7) {
case 5: writeBuffer(wram , address, type, value); break;
case 6: writeBuffer(pak.ram, address, type, value); break;
case 7: writeBuffer(pak.rom, address, type, value); break;
}
}
// Write bytes to the CPU bus
public boolean write(int address, byte[] src, int offset, int length) {
int count = 0; // Bytes to process in one iteration
public boolean writeBytes(int address, byte[] src, int offset, int length){
// Error checking
if (
@ -170,26 +214,126 @@ class JavaVUE extends VUE {
) return false;
// Perform the operation
for (; length > 0; address += count, length -= count, offset += count){
// Determine the maximum number of bytes to process at once
count = Math.min(length, 0x01000000 - (address & 0x00FFFFFF));
// Process by component
while (length > 0) {
int count = Math.min(length, 0x01000000 - (address & 0x00FFFFFF));
switch (address >> 24 & 7) {
case 5: /* System WRAM */
bus.writeBytes(bus.wram, src, address, offset, count);
break;
case 6: /* Cartridge RAM */
bus.writeBytes(bus.sram, src, address, offset, count);
break;
case 7: /* Cartridge ROM */
bus.writeBytes(bus.rom , src, address, offset, count);
break;
case 5: writeBytes(wram ,address,src,offset,count); break;
case 6: writeBytes(pak.ram,address,src,offset,count); break;
case 7: writeBytes(pak.rom,address,src,offset,count); break;
}
address += count;
length -= count;
offset += count;
}
};
return true;
}
///////////////////////////////////////////////////////////////////////////
// Package Methods //
///////////////////////////////////////////////////////////////////////////
// Read a value from a byte buffer
static int readBuffer(byte[] data, int address, int type) {
// Error checking
if (data == null)
return 0;
// Processing by data type
int size = TYPE_SIZES[type];
int value = 0;
address &= ~size + 1 & data.length - 1;
switch (type) {
case VUE.S32: value =
data[address + 3] << 24 |
(data[address + 2] & 0xFF) << 16;
// Fallthrough
case VUE.S16: // Fallthrough
case VUE.U16: value |=
(data[address + 1] & 0xFF) << 8;
// Fallthrough
case VUE.S8 : // Fallthrough
case VUE.U8 : value |=
data[address ] & 0xFF;
}
// Sign-extend the value if appropriate
if ((type & 1) == 1) {
size = 32 - (size << 3);
value = value << size >> size;
}
return value;
}
// Read bytes from a byte buffer
static void readBytes(byte[] data, int address, byte[] dest, int offset,
int length) {
// The source does not exist
if (data == null) {
Arrays.fill(dest, offset, offset + length, (byte) 0);
return;
}
// Transfer bytes from the source as a circular buffer
while (length > 0) {
address &= data.length - 1;
int count = Math.min(length, data.length - address);
System.arraycopy(data, address, dest, offset, count);
address += count;
length -= count;
offset += count;
}
}
// Write a value to a byte buffer
static void writeBuffer(byte[] data, int address, int type, int value) {
// Error checking
if (data == null)
return;
// Processing by data type
int size = TYPE_SIZES[type];
address &= ~size + 1 & data.length - 1;
switch (type) {
case VUE.S32:
data[address + 3] = (byte) (value >> 24);
data[address + 2] = (byte) (value >> 16);
// Fallthrough
case VUE.S16: // Fallthrough
case VUE.U16:
data[address + 1] = (byte) (value >> 8);
// Fallthrough
case VUE.S8 : // Fallthrough
case VUE.U8 : value |=
data[address ] = (byte) value;
}
}
// Write bytes to a byte buffer
static void writeBytes(byte[] data, int address, byte[] src, int offset,
int length) {
// The destination does not exist
if (data == null)
return;
// Transfer bytes to the destination as a circular buffer
while (length > 0) {
address &= data.length - 1;
int count = Math.min(length, data.length - address);
System.arraycopy(src, offset, data, address, count);
address += count;
length -= count;
offset += count;
}
}
}

51
src/desktop/vue/NativeVUE.c
View File

@ -75,13 +75,20 @@ JNIEXPORT void JNICALL Java_vue_NativeVUE_construct
JNIEXPORT void JNICALL Java_vue_NativeVUE_dispose
(JNIEnv *env, jobject vue) {
CORE *core = GetCore(env, vue);
if (core->vue.bus.rom != NULL)
free(core->vue.bus.rom);
if (core->vue.bus.sram != NULL)
free(core->vue.bus.sram);
if (core->vue.pak.rom != NULL)
free(core->vue.pak.rom);
if (core->vue.pak.ram != NULL)
free(core->vue.pak.ram);
free(core);
}
// Process the simulation
JNIEXPORT jint JNICALL Java_vue_NativeVUE_emulate
(JNIEnv *env, jobject vue, jint maxCycles) {
CORE *core = GetCore(env, vue);
return vueEmulate(&core->vue, maxCycles);
}
// Retrieve a register value
JNIEXPORT jint JNICALL Java_vue_NativeVUE_getRegister
(JNIEnv *env, jobject vue, jint index, jboolean system) {
@ -95,13 +102,13 @@ JNIEXPORT jbyteArray JNICALL Java_vue_NativeVUE_getROM
CORE *core = GetCore(env, vue);
// No ROM data
if (core->vue.bus.rom == NULL)
if (core->vue.pak.rom == NULL)
return NULL;
// Copy the ROM data
jbyteArray ret = (*env)->NewByteArray(env, (jint)core->vue.bus.romSize);
jbyteArray ret = (*env)->NewByteArray(env, (jint)core->vue.pak.romSize);
jbyte *elems = (*env)->GetByteArrayElements(env, ret, NULL);
memcpy(elems, core->vue.bus.rom, core->vue.bus.romSize);
memcpy(elems, core->vue.pak.rom, core->vue.pak.romSize);
(*env)->ReleaseByteArrayElements(env, ret, elems, 0);
return ret;
}
@ -112,8 +119,15 @@ JNIEXPORT jboolean JNICALL Java_vue_NativeVUE_isNative
return JNI_TRUE;
}
// Read a value from the CPU bus
JNIEXPORT jint JNICALL Java_vue_NativeVUE_read
(JNIEnv *env, jobject vue, jint address, jint type) {
CORE *core = GetCore(env, vue);
return vueRead(&core->vue, address, type);
}
// Read bytes from the CPU bus
JNIEXPORT jboolean JNICALL Java_vue_NativeVUE_read
JNIEXPORT jboolean JNICALL Java_vue_NativeVUE_readBytes
(JNIEnv *env, jobject vue, jint address, jbyteArray data, jint offset,
jint length) {
@ -128,7 +142,7 @@ JNIEXPORT jboolean JNICALL Java_vue_NativeVUE_read
// Perform the operation
CORE *core = GetCore(env, vue);
jbyte *elems = (*env)->GetByteArrayElements(env, data, NULL);
vueRead(&core->vue, address, &elems[offset], length);
vueReadBytes(&core->vue, address, &elems[offset], length);
(*env)->ReleaseByteArrayElements(env, data, elems, 0);
return JNI_TRUE;
}
@ -161,21 +175,28 @@ JNIEXPORT jboolean JNICALL Java_vue_NativeVUE_setROM
) return JNI_FALSE;
// Accept the new ROM data
uint8_t *rom = calloc(length, 1);
uint8_t *rom = malloc(length);
jbyte *elems = (*env)->GetByteArrayElements(env, data, NULL);
memcpy(rom, &elems[offset], length);
(*env)->ReleaseByteArrayElements(env, data, elems, 0);
// Transfer the ROM data to the emulation state
CORE *core = GetCore(env, vue);
if (core->vue.bus.rom != NULL)
free(core->vue.bus.rom);
if (core->vue.pak.rom != NULL)
free(core->vue.pak.rom);
vueSetROM(&core->vue, rom, length);
return JNI_TRUE;
}
/* Write bytes to the CPU bus */
JNIEXPORT jboolean JNICALL Java_vue_NativeVUE_write
// Write a value to the CPU bus
JNIEXPORT void JNICALL Java_vue_NativeVUE_write
(JNIEnv *env, jobject vue, jint address, jint type, jint value) {
CORE *core = GetCore(env, vue);
vueWrite(&core->vue, address, type, value);
}
// Write bytes to the CPU bus
JNIEXPORT jboolean JNICALL Java_vue_NativeVUE_writeBytes
(JNIEnv *env, jobject vue, jint address, jbyteArray data, jint offset,
jint length) {
@ -190,7 +211,7 @@ JNIEXPORT jboolean JNICALL Java_vue_NativeVUE_write
// Perform the operation
CORE *core = GetCore(env, vue);
jbyte *elems = (*env)->GetByteArrayElements(env, data, NULL);
vueWrite(&core->vue, address, &elems[offset], length);
vueWriteBytes(&core->vue, address, &elems[offset], length);
(*env)->ReleaseByteArrayElements(env, data, elems, 0);
return JNI_TRUE;
}

13
src/desktop/vue/NativeVUE.java
View File

@ -26,6 +26,9 @@ class NativeVUE extends VUE {
// Release any used resources
public native void dispose();
// Process the simulation
public native int emulate(int maxCycles);
// Retrieve a register value
public native int getRegister(int index, boolean system);
@ -35,8 +38,11 @@ class NativeVUE extends VUE {
// Determine whether the context is native-backed
public native boolean isNative();
// Read a value from the CPU bus
public native int read(int address, int type);
// Read bytes from the CPU bus
public native boolean read(int address, byte[] dest, int offset,
public native boolean readBytes(int address, byte[] dest, int offset,
int length);
// Initialize all system components
@ -48,8 +54,11 @@ class NativeVUE extends VUE {
// Provide new ROM data
public native boolean setROM(byte[] data, int offset, int length);
// Write a value to the CPU bus
public native void write(int address, int type, int value);
// Write bytes to the CPU bus
public native boolean write(int address, byte[] src, int offset,
public native boolean writeBytes(int address, byte[] src, int offset,
int length);

13
src/desktop/vue/VUE.java
View File

@ -158,6 +158,9 @@ public abstract class VUE {
// Release any used resources
public abstract void dispose();
// Process the simulation
public abstract int emulate(int maxCycles);
// Retrieve a register value
public abstract int getRegister(int index, boolean system);
@ -167,8 +170,11 @@ public abstract class VUE {
// Determine whether the context is native-backed
public abstract boolean isNative();
// Read a value from the CPU bus
public abstract int read(int address, int type);
// Read bytes from the CPU bus
public abstract boolean read(int address, byte[] dest, int offset,
public abstract boolean readBytes(int address, byte[] dest, int offset,
int length);
// Initialize all system components
@ -180,8 +186,11 @@ public abstract class VUE {
// Provide new ROM data
public abstract boolean setROM(byte[] data, int offset, int length);
// Write a value to the CPU bus
public abstract void write(int address, int type, int value);
// Write bytes to the CPU bus
public abstract boolean write(int address, byte[] src, int offset,
public abstract boolean writeBytes(int address, byte[] src, int offset,
int length);
}