mpw/cpu/memory.c

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#include "defs.h"
#include "fmem.h"
#include "CpuModule.h"
/*============================================================================*/
/* Illegal read / write fault information */
/*============================================================================*/
BOOLE memory_fault_read = FALSE; /* TRUE - read / FALSE - write */
ULO memory_fault_address = 0;
/*==============================================================================
Raises exception 3 when a word or long is accessing an odd address
and the CPU is < 020
==============================================================================*/
static void memoryOddRead(ULO address)
{
if (address & 1)
{
if (cpuGetModelMajor() < 2)
{
memory_fault_read = TRUE;
memory_fault_address = address;
cpuThrowAddressErrorException();
}
}
}
static void memoryOddWrite(ULO address)
{
if (address & 1)
{
if (cpuGetModelMajor() < 2)
{
memory_fault_read = FALSE;
memory_fault_address = address;
cpuThrowAddressErrorException();
}
}
}
// new memory functions.
static uint8_t *Memory = NULL;
static uint32_t MemorySize = 0;
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static uint32_t MemoryGlobalLog = 0;
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void memorySetMemory(uint8_t *memory, uint32_t size)
{
Memory = memory;
MemorySize = size;
}
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void memorySetGlobalLog(uint32_t globalLog)
{
MemoryGlobalLog = globalLog;
}
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uint8_t *memoryPointer(uint32_t address)
{
return Memory + address;
}
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// memory read of 0xffffffff not handled correctly
// since the unsigned compare overflows.
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UBY memoryReadByte(ULO address)
{
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if (address < MemoryGlobalLog)
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{
fprintf(stderr, "memoryReadByte(%08x)\n", address);
}
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// hmmm... 32-bit clean addresses?
if (address < MemorySize)
return Memory[address];
return 0;
}
UWO memoryReadWord(ULO address)
{
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if (address < MemoryGlobalLog)
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{
fprintf(stderr, "memoryReadWord(%08x)\n", address);
}
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if (address & 0x01) memoryOddRead(address);
if (address + 1 < MemorySize)
return (Memory[address++] << 8)
| (Memory[address++] << 0);
return 0;
}
ULO memoryReadLong(ULO address)
{
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if (address < MemoryGlobalLog)
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{
fprintf(stderr, "memoryReadLong(%08x)\n", address);
}
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if (address & 0x01) memoryOddRead(address);
if (address + 1 < MemorySize)
return (Memory[address++] << 24)
| (Memory[address++] << 16)
| (Memory[address++] << 8)
| (Memory[address++] << 0);
return 0;
}
void memoryWriteByte(UBY data, ULO address)
{
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if (address < MemoryGlobalLog)
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{
fprintf(stderr, "memoryWriteByte(%02x, %08x)\n", data, address);
}
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if (address < MemorySize)
{
Memory[address] = data;
}
}
void memoryWriteWord(UWO data, ULO address)
{
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if (address < MemoryGlobalLog)
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{
fprintf(stderr, "memoryWriteWord(%04x, %08x)\n", data, address);
}
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if (address & 0x01) memoryOddWrite(address);
if (address + 1 < MemorySize)
{
Memory[address++] = data >> 8;
Memory[address++] = data >> 0;
}
}
void memoryWriteLong(ULO data, ULO address)
{
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if (address < MemoryGlobalLog)
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{
fprintf(stderr, "memoryWriteLong(%08x, %08x)\n", data, address);
}
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if (address & 0x01) memoryOddWrite(address);
if (address + 3 < MemorySize)
{
Memory[address++] = data >> 24;
Memory[address++] = data >> 16;
Memory[address++] = data >> 8;
Memory[address++] = data >> 0;
}
}