Retro/pcem
Watch
1
0
Fork
You've already forked pcem
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

FDC Sense Interrupt Status doesn't send track number when no interrupt pending. Fixes floppy drive on early Linux kernels.

Browse source
This commit is contained in:
SarahW 2018-01-26 21:31:37 +00:00
commit 966e787a25
1 changed files with 23 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

17
src/fdc.c
View file

@ -63,6 +63,8 @@ typedef struct FDC
int fifo, tfifo; int fifo, tfifo;
int fifobufpos; int fifobufpos;
uint8_t fifobuf[16]; uint8_t fifobuf[16];
int int_pending;
} FDC; } FDC;
static FDC fdc; static FDC fdc;
@ -464,6 +466,8 @@ void fdc_write(uint16_t addr, uint8_t val, void *priv)
fdc.stat=0x90; fdc.stat=0x90;
break; break;
case 8: /*Sense interrupt status*/ case 8: /*Sense interrupt status*/
if (fdc.int_pending || fdc_reset_stat)
{
// printf("Sense interrupt status %i\n",curdrive); // printf("Sense interrupt status %i\n",curdrive);
fdc.lastdrive = fdc.drive; fdc.lastdrive = fdc.drive;
// fdc.stat = 0x10 | (fdc.stat & 0xf); // fdc.stat = 0x10 | (fdc.stat & 0xf);
@ -471,6 +475,15 @@ void fdc_write(uint16_t addr, uint8_t val, void *priv)
discint = 8; discint = 8;
fdc.pos = 0; fdc.pos = 0;
fdc_callback(); fdc_callback();
}
else
{
fdc.stat=0x10;
discint=0xfc;
timer_process();
disctime = 200 * (1 << TIMER_SHIFT);
timer_update_outstanding();
}
break; break;
case 10: /*Read sector ID*/ case 10: /*Read sector ID*/
fdc.pnum=0; fdc.pnum=0;
@ -967,6 +980,7 @@ void fdc_callback()
fdc.st0 = 0x20 | (fdc.params[0] & 3) | (fdc.head?4:0); fdc.st0 = 0x20 | (fdc.params[0] & 3) | (fdc.head?4:0);
else else
fdc.st0 = 0x68 | (fdc.params[0] & 3) | (fdc.head?4:0); fdc.st0 = 0x68 | (fdc.params[0] & 3) | (fdc.head?4:0);
fdc.int_pending = 1;
discint=-3; discint=-3;
timer_process(); timer_process();
disctime = 2048 * (1 << TIMER_SHIFT); disctime = 2048 * (1 << TIMER_SHIFT);
@ -987,7 +1001,7 @@ void fdc_callback()
if (fdc_reset_stat) if (fdc_reset_stat)
fdc_reset_stat--; fdc_reset_stat--;
if (!fdc_reset_stat) if (!fdc_reset_stat)
fdc.st0 = 0x80; fdc.int_pending = 0;
paramstogo = 2; paramstogo = 2;
discint = 0; discint = 0;
@ -1053,6 +1067,7 @@ void fdc_callback()
fdc.st0 = 0x20 | (fdc.params[0] & 3) | (fdc.head?4:0); fdc.st0 = 0x20 | (fdc.params[0] & 3) | (fdc.head?4:0);
else else
fdc.st0 = 0x68 | (fdc.params[0] & 3) | (fdc.head?4:0); fdc.st0 = 0x68 | (fdc.params[0] & 3) | (fdc.head?4:0);
fdc.int_pending = 1;
discint=-3; discint=-3;
timer_process(); timer_process();
disctime = 2048 * (1 << TIMER_SHIFT); disctime = 2048 * (1 << TIMER_SHIFT);