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mmu_fallback.c
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mmu_fallback.c
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#include <stdlib.h>
#include <string.h>
#include "common.h"
#include "mmu.h"
#include "state.h"
#include "diag.h"
HANDLE_DIAGNOSTICS(mmu_fallback)
static BYTE mmu_fallback_read_byte(LONG addr)
{
return 0xff;
}
static WORD mmu_fallback_read_word(LONG addr)
{
return 0xffff;
}
static void mmu_fallback_write_byte(LONG addr, BYTE data)
{
/* Do nothing here */
}
static void mmu_fallback_write_word(LONG addr, WORD data)
{
/* Do nothing here */
}
static int mmu_fallback_state_collect(struct mmu_state *state)
{
state->size = 0;
return STATE_VALID;
}
static void mmu_fallback_state_restore(struct mmu_state *state)
{
}
static void mmu_fallback_register(char *name, LONG addr, int size)
{
struct mmu *mmu_fallback;
mmu_fallback = mmu_create(name, "Fallback");
mmu_fallback->start = addr;
mmu_fallback->size = size;
mmu_fallback->read_byte = mmu_fallback_read_byte;
mmu_fallback->read_word = mmu_fallback_read_word;
mmu_fallback->write_byte = mmu_fallback_write_byte;
mmu_fallback->write_word = mmu_fallback_write_word;
mmu_fallback->state_collect = mmu_fallback_state_collect;
mmu_fallback->state_restore = mmu_fallback_state_restore;
mmu_fallback->diagnostics = mmu_fallback_diagnostics;
mmu_register(mmu_fallback);
}
void mmu_fallback_init()
{
/* Memory areas that will not actually do anything, but also not cause bus errors to occur */
mmu_fallback_register("FBK0", 0xfffa30, 16);
mmu_fallback_register("FBK1", 0xfffc00, 32);
mmu_fallback_register("FBK2", 0xfffc20, 480);
}