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86Box/src/pic.c

424 lines
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Initial submission of the PCem-Experimental source code.
2016-06-26 00:34:39 +02:00
#include "ibm.h"
#include "io.h"
#include "pic.h"
int output;
int intclear;
int keywaiting=0;
int pic_intpending;
void pic_updatepending()
{
if ((pic2.pend&~pic2.mask)&~pic2.mask2)
pic.pend |= (1 << 2);
else
pic.pend &= ~(1 << 2);
pic_intpending = (pic.pend & ~pic.mask) & ~pic.mask2;
if (!((pic.mask | pic.mask2) & (1 << 2)))
pic_intpending |= ((pic2.pend&~pic2.mask)&~pic2.mask2);
/* pclog("pic_intpending = %i %02X %02X %02X %02X\n", pic_intpending, pic.ins, pic.pend, pic.mask, pic.mask2);
pclog(" %02X %02X %02X %02X %i %i\n", pic2.ins, pic2.pend, pic2.mask, pic2.mask2, ((pic.mask | pic.mask2) & (1 << 2)), ((pic2.pend&~pic2.mask)&~pic2.mask2));*/
}
void pic_reset()
{
pic.icw=0;
pic.mask=0xFF;
pic.mask2=0;
pic.pend=pic.ins=0;
pic.vector=8;
pic.read=1;
pic2.icw=0;
pic2.mask=0xFF;
pic.mask2=0;
pic2.pend=pic2.ins=0;
pic_intpending = 0;
}
void pic_update_mask(uint8_t *mask, uint8_t ins)
{
int c;
*mask = 0;
for (c = 0; c < 8; c++)
{
if (ins & (1 << c))
{
*mask = 0xff << c;
return;
}
}
}
static void pic_autoeoi()
{
int c;
for (c=0;c<8;c++)
{
if (pic.ins&(1<<c))
{
pic.ins&=~(1<<c);
pic_update_mask(&pic.mask2, pic.ins);
if (c == 2 && (pic2.pend&~pic2.mask)&~pic2.mask2)
pic.pend |= (1 << 2);
pic_updatepending();
return;
}
}
}
void pic_write(uint16_t addr, uint8_t val, void *priv)
{
int c;
// pclog("Write PIC %04X %02X %04X(%06X):%04X\n",addr,val,CS,cs,pc);
if (addr&1)
{
switch (pic.icw)
{
case 0: /*OCW1*/
// printf("Write mask %02X %04X:%04X\n",val,CS,pc);
pic.mask=val;
pic_updatepending();
break;
case 1: /*ICW2*/
pic.vector=val&0xF8;
// printf("PIC vector now %02X\n",pic.vector);
// output=1;
if (pic.icw1&2) pic.icw=3;
else pic.icw=2;
break;
case 2: /*ICW3*/
if (pic.icw1&1) pic.icw=3;
else pic.icw=0;
break;
case 3: /*ICW4*/
pic.icw4 = val;
// pclog("ICW4 = %02x\n", val);
pic.icw=0;
break;
}
}
else
{
if (val&16) /*ICW1*/
{
RTL8029AS now works properly (patch from TheCollector1995 with some modifications by me); SVGA emulation now has partial support for 12x24 text mode used by 48k HECON.SYS; LEA AX,DX now once again issues #UD on 286+ like it should; FF /7 is now correctly an alias of FF /6 on 8080x; Hard disk configuration dialog now uses Segoe UI 9pt font instead of MS Sans Serif 8pt; Removed excess logging from serial mouse and x86seg.c; Applied mainline PCem PIT MSW1 fix commit; IMG-based floppy emulation now takes GAP4 and post-sector delays into account; Comemnted out emulation of non-Overdrive Pentium II's.
2016-08-13 03:32:38 +02:00
pic.mask=0;
Initial submission of the PCem-Experimental source code.
2016-06-26 00:34:39 +02:00
pic.mask2=0;
pic.icw=1;
pic.icw1=val;
pic.ins = 0;
pic_updatepending();
}
else if (!(val&8)) /*OCW2*/
{
// printf("Clear ints - %02X %02X\n",pic.ins,val);
if ((val&0xE0)==0x60)
{
// pclog("Specific EOI - %02X %i\n",pic.ins,1<<(val&7));
pic.ins&=~(1<<(val&7));
pic_update_mask(&pic.mask2, pic.ins);
if (val == 2 && (pic2.pend&~pic2.mask)&~pic2.mask2)
pic.pend |= (1 << 2);
// pic.pend&=(1<<(val&7));
// if ((val&7)==1) pollkeywaiting();
pic_updatepending();
}
else
{
for (c=0;c<8;c++)
{
if (pic.ins&(1<<c))
{
pic.ins&=~(1<<c);
pic_update_mask(&pic.mask2, pic.ins);
if (c == 2 && (pic2.pend&~pic2.mask)&~pic2.mask2)
pic.pend |= (1 << 2);
if (c==1 && keywaiting)
{
intclear&=~1;
// pollkeywaiting();
}
pic_updatepending();
// pclog("Generic EOI - Cleared int %i\n",c);
return;
}
}
}
}
else /*OCW3*/
{
// if (val&4) fatal("PIC1 write OCW3 4 %02X\n",val);
if (val&2) pic.read=(val&1);
if (val&0x40) { } //fatal("PIC 1 write OCW3 40 %02X\n",val);
}
}
}
uint8_t pic_read(uint16_t addr, void *priv)
{
if (addr&1) { /*pclog("Read PIC mask %02X\n",pic.mask);*/ return pic.mask; }
if (pic.read) { /*pclog("Read PIC ins %02X\n",pic.ins);*/ return pic.ins | (pic2.ins ? 4 : 0); }
// pclog("Read PIC pend %02X %08X\n",pic.pend,EDX);
return pic.pend;
}
void pic_init()
{
io_sethandler(0x0020, 0x0002, pic_read, NULL, NULL, pic_write, NULL, NULL, NULL);
}
static void pic2_autoeoi()
{
int c;
for (c = 0; c < 8; c++)
{
if (pic2.ins & (1 << c))
{
pic2.ins &= ~(1 << c);
pic_update_mask(&pic2.mask2, pic2.ins);
pic_updatepending();
return;
}
}
}
void pic2_write(uint16_t addr, uint8_t val, void *priv)
{
int c;
// pclog("Write PIC2 %04X %02X %04X:%04X %i\n",addr,val,CS,pc,ins);
if (addr&1)
{
switch (pic2.icw)
{
case 0: /*OCW1*/
// printf("PIC2 Write mask %02X %04X:%04X\n",val,CS,pc);
pic2.mask=val;
pic_updatepending();
break;
case 1: /*ICW2*/
pic2.vector=val&0xF8;
// pclog("PIC2 vector %02X\n", val & 0xf8);
if (pic2.icw1&2) pic2.icw=3;
else pic2.icw=2;
break;
case 2: /*ICW3*/
if (pic2.icw1&1) pic2.icw=3;
else pic2.icw=0;
break;
case 3: /*ICW4*/
pic2.icw4 = val;
pic2.icw=0;
break;
}
}
else
{
if (val&16) /*ICW1*/
{
RTL8029AS now works properly (patch from TheCollector1995 with some modifications by me); SVGA emulation now has partial support for 12x24 text mode used by 48k HECON.SYS; LEA AX,DX now once again issues #UD on 286+ like it should; FF /7 is now correctly an alias of FF /6 on 8080x; Hard disk configuration dialog now uses Segoe UI 9pt font instead of MS Sans Serif 8pt; Removed excess logging from serial mouse and x86seg.c; Applied mainline PCem PIT MSW1 fix commit; IMG-based floppy emulation now takes GAP4 and post-sector delays into account; Comemnted out emulation of non-Overdrive Pentium II's.
2016-08-13 03:32:38 +02:00
pic2.mask=0;
Initial submission of the PCem-Experimental source code.
2016-06-26 00:34:39 +02:00
pic2.mask2=0;
pic2.icw=1;
pic2.icw1=val;
pic2.ins = 0;
pic_updatepending();
}
else if (!(val&8)) /*OCW2*/
{
if ((val&0xE0)==0x60)
{
pic2.ins&=~(1<<(val&7));
pic_update_mask(&pic2.mask2, pic2.ins);
pic_updatepending();
}
else
{
for (c=0;c<8;c++)
{
if (pic2.ins&(1<<c))
{
pic2.ins &= ~(1<<c);
pic_update_mask(&pic2.mask2, pic2.ins);
pic_updatepending();
return;
}
}
}
}
else /*OCW3*/
{
if (val&2) pic2.read=(val&1);
}
}
}
uint8_t pic2_read(uint16_t addr, void *priv)
{
if (addr&1) { /*pclog("Read PIC2 mask %02X %04X:%08X\n",pic2.mask,CS,pc);*/ return pic2.mask; }
if (pic2.read) { /*pclog("Read PIC2 ins %02X %04X:%08X\n",pic2.ins,CS,pc);*/ return pic2.ins; }
/*pclog("Read PIC2 pend %02X %04X:%08X\n",pic2.pend,CS,pc);*/
return pic2.pend;
}
void pic2_init()
{
io_sethandler(0x00a0, 0x0002, pic2_read, NULL, NULL, pic2_write, NULL, NULL, NULL);
}
void clearpic()
{
pic.pend=pic.ins=0;
pic_updatepending();
// pclog("Clear PIC\n");
}
int pic_current[16];
void picint(uint16_t num)
{
if (AT && num == (1 << 2))
num = 1 << 9;
// pclog("picint : %04X\n", num);
// if (num == 0x10) pclog("PICINT 10\n");
if (num>0xFF)
{
pic2.pend|=(num>>8);
if ((pic2.pend&~pic2.mask)&~pic2.mask2)
pic.pend |= (1 << 2);
}
else
{
pic.pend|=num;
}
// pclog("picint : PEND now %02X %02X\n", pic.pend, pic2.pend);
pic_updatepending();
}
void picintlevel(uint16_t num)
{
int c = 0;
while (!(num & (1 << c))) c++;
if (AT && c == 2)
{
c = 9;
num = 1 << 9;
}
// pclog("INTLEVEL %04X %i\n", num, c);
if (!pic_current[c])
{
pic_current[c]=1;
if (num>0xFF)
{
pic2.pend|=(num>>8);
}
else
{
pic.pend|=num;
}
}
pic_updatepending();
}
void picintc(uint16_t num)
{
int c = 0;
if (!num)
return;
while (!(num & (1 << c))) c++;
if (AT && c == 2)
{
c = 9;
num = 1 << 9;
}
// pclog("INTC %04X %i\n", num, c);
pic_current[c]=0;
if (num > 0xff)
{
pic2.pend &= ~(num >> 8);
if (!((pic2.pend&~pic2.mask)&~pic2.mask2))
pic.pend &= ~(1 << 2);
}
else
{
pic.pend&=~num;
}
pic_updatepending();
}
uint8_t picinterrupt()
{
uint8_t temp=pic.pend&~pic.mask;
int c;
for (c = 0; c < 2; c++)
{
if (temp & (1 << c))
{
pic.pend &= ~(1 << c);
pic.ins |= (1 << c);
pic_update_mask(&pic.mask2, pic.ins);
pic_updatepending();
if (pic.icw4 & 0x02)
pic_autoeoi();
return c+pic.vector;
}
}
if (temp & (1 << 2))
{
uint8_t temp2 = pic2.pend & ~pic2.mask;
for (c = 0; c < 8; c++)
{
if (temp2 & (1 << c))
{
pic2.pend &= ~(1 << c);
pic2.ins |= (1 << c);
pic_update_mask(&pic2.mask2, pic2.ins);
pic.pend &= ~(1 << c);
pic.ins |= (1 << 2); /*Cascade IRQ*/
pic_update_mask(&pic.mask2, pic.ins);
pic_updatepending();
if (pic2.icw4 & 0x02)
pic2_autoeoi();
return c+pic2.vector;
}
}
}
for (c = 3; c < 8; c++)
{
if (temp & (1 << c))
{
pic.pend &= ~(1 << c);
pic.ins |= (1 << c);
pic_update_mask(&pic.mask2, pic.ins);
pic_updatepending();
if (pic.icw4 & 0x02)
pic_autoeoi();
return c+pic.vector;
}
}
return 0xFF;
}
void dumppic()
{
pclog("PIC1 : MASK %02X PEND %02X INS %02X VECTOR %02X\n",pic.mask,pic.pend,pic.ins,pic.vector);
pclog("PIC2 : MASK %02X PEND %02X INS %02X VECTOR %02X\n",pic2.mask,pic2.pend,pic2.ins,pic2.vector);
}
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