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new memory code

This commit is contained in:
Kelvin Sherlock 2013-02-06 20:05:47 -05:00
parent a81b1676f8
commit c41ddbc094
2 changed files with 120 additions and 0 deletions
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cpu/fellow.h Normal file
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cpu/memory.c Normal file
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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;
void memorySetMemory(uint8_t *memory, uint32_t size)
{
Memory = memory;
MemorySize = size;
}
UBY memoryReadByte(ULO address)
{
// hmmm... 32-bit clean addresses?
if (address < MemorySize)
return Memory[address];
return 0;
}
UWO memoryReadWord(ULO address)
{
if (address & 0x01) memoryOddRead(address);
if (address + 1 < MemorySize)
return (Memory[address++] << 8)
| (Memory[address++] << 0);
return 0;
}
ULO memoryReadLong(ULO address)
{
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)
{
if (address < MemorySize)
{
Memory[address] = data;
}
}
void memoryWriteWord(UWO data, ULO address)
{
if (address & 0x01) memoryOddWrite(address);
if (address + 1 < MemorySize)
{
Memory[address++] = data >> 8;
Memory[address++] = data >> 0;
}
}
void memoryWriteLong(ULO data, ULO address)
{
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;
}
}