mirror of
https://github.com/rkujawa/rk65c02.git
synced 2024-06-08 06:29:30 +00:00
2cc9d86c64
There's no way to reliable handle out of memory situation in an emulator. So just bail out by raising assertion.
86 lines
1.3 KiB
C
86 lines
1.3 KiB
C
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <assert.h>
|
|
#include <string.h>
|
|
|
|
#include <gc/gc.h>
|
|
|
|
#include "bus.h"
|
|
#include "device.h"
|
|
|
|
#define FB_AS_SIZE 0x1000
|
|
|
|
#define CHAR_RAM_SIZE (80*50) /* 0xFA0 */
|
|
#define CHAR_FONT_WIDTH 8
|
|
#define CHAR_FONT_HEIGHT 8
|
|
|
|
struct fb_state {
|
|
uint8_t *cram;
|
|
|
|
void (*fb_callback_screen_update)(uint8_t *);
|
|
};
|
|
|
|
uint8_t device_fb_read_1(void *, uint16_t);
|
|
void device_fb_write_1(void *, uint16_t, uint8_t);
|
|
|
|
uint8_t
|
|
device_fb_read_1(void *vd, uint16_t offset)
|
|
{
|
|
device_t *d;
|
|
struct fb_state *f;
|
|
|
|
d = (device_t *) vd;
|
|
f = d->aux;
|
|
|
|
return f->cram[offset];
|
|
}
|
|
|
|
void
|
|
device_fb_write_1(void *vd, uint16_t offset, uint8_t val)
|
|
{
|
|
device_t *d;
|
|
|
|
struct fb_state *f;
|
|
|
|
d = (device_t *) vd;
|
|
f = d->aux;
|
|
|
|
f->cram[offset] = val;
|
|
|
|
if (f->fb_callback_screen_update != NULL)
|
|
f->fb_callback_screen_update(f->cram);
|
|
}
|
|
|
|
device_t *
|
|
device_fb_init()
|
|
{
|
|
device_t *d;
|
|
struct fb_state *f;
|
|
|
|
d = (device_t *) GC_MALLOC(sizeof(device_t));
|
|
|
|
assert(d != NULL);
|
|
|
|
d->name = "FB";
|
|
d->size = FB_AS_SIZE;
|
|
|
|
d->read_1 = device_fb_read_1;
|
|
d->write_1 = device_fb_write_1;
|
|
|
|
f = GC_MALLOC(sizeof(struct fb_state));
|
|
assert(f != NULL);
|
|
d->aux = f;
|
|
|
|
f->cram = GC_MALLOC(FB_AS_SIZE);
|
|
assert(f->cram != NULL);
|
|
memset(d->aux, 0, FB_AS_SIZE);
|
|
|
|
return d;
|
|
}
|
|
|
|
void
|
|
device_fb_finish(device_t *d)
|
|
{
|
|
}
|
|
|