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

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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
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31
src/fdc.c
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@ -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;
@ -464,13 +466,24 @@ 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*/
// printf("Sense interrupt status %i\n",curdrive); if (fdc.int_pending || fdc_reset_stat)
fdc.lastdrive = fdc.drive; {
// fdc.stat = 0x10 | (fdc.stat & 0xf); // printf("Sense interrupt status %i\n",curdrive);
// fdc_time=1024; fdc.lastdrive = fdc.drive;
discint = 8; // fdc.stat = 0x10 | (fdc.stat & 0xf);
fdc.pos = 0; // fdc_time=1024;
fdc_callback(); discint = 8;
fdc.pos = 0;
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);