50 lines
1.2 KiB
C
50 lines
1.2 KiB
C
#include <stdlib.h>
|
|
#include "ibm.h"
|
|
#include "device.h"
|
|
#include "mem.h"
|
|
#include "zenith.h"
|
|
|
|
static uint8_t *zenith_scratchpad_ram;
|
|
static mem_mapping_t zenith_scratchpad_mapping;
|
|
|
|
static uint8_t zenith_scratchpad_read(uint32_t addr, void *p)
|
|
{
|
|
return zenith_scratchpad_ram[addr & 0x3fff];
|
|
}
|
|
static void zenith_scratchpad_write(uint32_t addr, uint8_t val, void *p)
|
|
{
|
|
zenith_scratchpad_ram[addr & 0x3fff] = val;
|
|
}
|
|
|
|
static void *zenith_scratchpad_init()
|
|
{
|
|
zenith_scratchpad_ram = malloc(0x4000);
|
|
|
|
mem_mapping_disable(&bios_mapping[4]);
|
|
mem_mapping_disable(&bios_mapping[5]);
|
|
|
|
mem_mapping_add(&zenith_scratchpad_mapping, 0xf0000, 0x4000,
|
|
zenith_scratchpad_read, NULL, NULL,
|
|
zenith_scratchpad_write, NULL, NULL,
|
|
zenith_scratchpad_ram, MEM_MAPPING_EXTERNAL, NULL);
|
|
|
|
return zenith_scratchpad_ram;
|
|
}
|
|
|
|
static void zenith_scratchpad_close(void *p)
|
|
{
|
|
free(p);
|
|
}
|
|
|
|
device_t zenith_scratchpad_device =
|
|
{
|
|
"Zenith scratchpad RAM",
|
|
0,
|
|
zenith_scratchpad_init,
|
|
zenith_scratchpad_close,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL
|
|
};
|