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Make bus read/writes possible to devices mapped anywhere, not only 0.

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This commit is contained in:
Radosław Kujawa 2017-02-22 22:43:58 +01:00
parent 7ab946c5df
commit dcf275939b
1 changed files with 34 additions and 24 deletions
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58
src/bus.c
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@ -47,44 +47,54 @@ uint8_t
bus_read_1(bus_t *t, uint16_t addr) bus_read_1(bus_t *t, uint16_t addr)
{ {
uint8_t val; uint8_t val;
uint16_t doff;
device_mapping_t *dm; device_mapping_t *dm;
device_t *d; device_t *dtmp, *d;
d = NULL;
LL_FOREACH(t->dm_head, dm) { LL_FOREACH(t->dm_head, dm) {
d = dm->dev; dtmp = dm->dev;
if ( (addr >= dm->addr) && (addr < (dm->addr + dtmp->size)) ) {
if (dm->addr == 0) d = dtmp;
val = d->read_1(d, addr); doff = dm->addr;
/* }
* else
* Check if address is inside of given device range, calculate
* offset.
*/
} }
// printf("bus READ @ %x value %x\n", addr, val);
if (d == NULL) {
fprintf(stderr, "Hitting unmapped bus space @ %x!", addr);
return 0xFF;
}
val = d->read_1(d, addr - doff);
printf("bus READ @ %x (off %x) value %x\n", addr, addr - doff, val);
return val; return val;
} }
void void
bus_write_1(bus_t *t, uint16_t addr, uint8_t val) bus_write_1(bus_t *t, uint16_t addr, uint8_t val)
{ {
uint16_t doff;
device_mapping_t *dm; device_mapping_t *dm;
device_t *d; device_t *dtmp, *d;
d = NULL;
LL_FOREACH(t->dm_head, dm) { LL_FOREACH(t->dm_head, dm) {
d = dm->dev; dtmp = dm->dev;
if ( (addr >= dm->addr) && (addr < (dm->addr + dtmp->size)) ) {
if (dm->addr == 0) d = dtmp;
d->write_1(d, addr, val); doff = dm->addr;
/* }
* else
* Check if address is inside of given device range, calculate
* offset.
*/
} }
// printf("bus WRITE @ %x value %x\n", addr, val);
if (d == NULL) {
fprintf(stderr, "Hitting unmapped bus space @ %x!", addr);
}
printf("bus WRITE @ %x (off %x) value %x\n", addr, addr - doff, val);
d->write_1(d, addr, val);
} }
bus_t bus_t