6602a32304
Disable PIT timer operation between write of control word and initial count. Lemmings High Performance PC mode now works without incorrect rev 339 commit.
371 lines
12 KiB
C
371 lines
12 KiB
C
#include "ibm.h"
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#include "io.h"
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#include "pic.h"
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int output;
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int intclear;
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int keywaiting=0;
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int pic_intpending;
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void pic_updatepending()
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{
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if ((pic2.pend&~pic2.mask)&~pic2.mask2)
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pic.pend |= (1 << 2);
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else
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pic.pend &= ~(1 << 2);
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pic_intpending = (pic.pend & ~pic.mask) & ~pic.mask2;
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if (!((pic.mask | pic.mask2) & (1 << 2)))
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pic_intpending |= ((pic2.pend&~pic2.mask)&~pic2.mask2);
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/* pclog("pic_intpending = %i %02X %02X %02X %02X\n", pic_intpending, pic.ins, pic.pend, pic.mask, pic.mask2);
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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));*/
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}
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void pic_reset()
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{
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pic.icw=0;
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pic.mask=0xFF;
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pic.mask2=0;
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pic.pend=pic.ins=0;
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pic.vector=8;
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pic.read=1;
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pic2.icw=0;
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pic2.mask=0xFF;
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pic.mask2=0;
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pic2.pend=pic2.ins=0;
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pic_intpending = 0;
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}
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void pic_update_mask(uint8_t *mask, uint8_t ins)
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{
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int c;
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*mask = 0;
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for (c = 0; c < 8; c++)
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{
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if (ins & (1 << c))
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{
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*mask = 0xff << c;
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return;
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}
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}
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}
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void pic_write(uint16_t addr, uint8_t val, void *priv)
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{
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int c;
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// pclog("Write PIC %04X %02X %04X(%06X):%04X\n",addr,val,CS,cs,pc);
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if (addr&1)
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{
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switch (pic.icw)
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{
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case 0: /*OCW1*/
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// printf("Write mask %02X %04X:%04X\n",val,CS,pc);
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pic.mask=val;
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pic_updatepending();
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break;
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case 1: /*ICW2*/
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pic.vector=val&0xF8;
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// printf("PIC vector now %02X\n",pic.vector);
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// output=1;
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if (pic.icw1&2) pic.icw=3;
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else pic.icw=2;
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break;
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case 2: /*ICW3*/
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if (pic.icw1&1) pic.icw=3;
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else pic.icw=0;
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break;
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case 3: /*ICW4*/
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pic.icw=0;
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break;
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}
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}
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else
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{
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if (val&16) /*ICW1*/
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{
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pic.mask=0xFF;
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pic.mask2=0;
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pic.icw=1;
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pic.icw1=val;
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pic.ins = 0;
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pic_updatepending();
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}
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else if (!(val&8)) /*OCW2*/
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{
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// printf("Clear ints - %02X %02X\n",pic.ins,val);
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if ((val&0xE0)==0x60)
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{
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// pclog("Specific EOI - %02X %i\n",pic.ins,1<<(val&7));
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pic.ins&=~(1<<(val&7));
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pic_update_mask(&pic.mask2, pic.ins);
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if (val == 2 && (pic2.pend&~pic2.mask)&~pic2.mask2)
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pic.pend |= (1 << 2);
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// pic.pend&=(1<<(val&7));
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// if ((val&7)==1) pollkeywaiting();
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pic_updatepending();
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}
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else
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{
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for (c=0;c<8;c++)
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{
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if (pic.ins&(1<<c))
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{
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pic.ins&=~(1<<c);
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pic_update_mask(&pic.mask2, pic.ins);
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if (c == 2 && (pic2.pend&~pic2.mask)&~pic2.mask2)
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pic.pend |= (1 << 2);
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if (c==1 && keywaiting)
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{
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intclear&=~1;
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// pollkeywaiting();
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}
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pic_updatepending();
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// pclog("Generic EOI - Cleared int %i\n",c);
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return;
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}
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}
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}
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}
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else /*OCW3*/
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{
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// if (val&4) fatal("PIC1 write OCW3 4 %02X\n",val);
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if (val&2) pic.read=(val&1);
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if (val&0x40) { } //fatal("PIC 1 write OCW3 40 %02X\n",val);
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}
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}
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}
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uint8_t pic_read(uint16_t addr, void *priv)
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{
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if (addr&1) { /*pclog("Read PIC mask %02X\n",pic.mask);*/ return pic.mask; }
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if (pic.read) { /*pclog("Read PIC ins %02X\n",pic.ins);*/ return pic.ins | (pic2.ins ? 4 : 0); }
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// pclog("Read PIC pend %02X %08X\n",pic.pend,EDX);
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return pic.pend;
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}
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void pic_init()
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{
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io_sethandler(0x0020, 0x0002, pic_read, NULL, NULL, pic_write, NULL, NULL, NULL);
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}
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void pic2_write(uint16_t addr, uint8_t val, void *priv)
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{
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int c;
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// pclog("Write PIC2 %04X %02X %04X:%04X %i\n",addr,val,CS,pc,ins);
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if (addr&1)
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{
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switch (pic2.icw)
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{
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case 0: /*OCW1*/
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// printf("PIC2 Write mask %02X %04X:%04X\n",val,CS,pc);
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pic2.mask=val;
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pic_updatepending();
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break;
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case 1: /*ICW2*/
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pic2.vector=val&0xF8;
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// pclog("PIC2 vector %02X\n", val & 0xf8);
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if (pic2.icw1&2) pic2.icw=3;
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else pic2.icw=2;
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break;
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case 2: /*ICW3*/
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if (pic2.icw1&1) pic2.icw=3;
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else pic2.icw=0;
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break;
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case 3: /*ICW4*/
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pic2.icw=0;
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break;
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}
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}
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else
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{
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if (val&16) /*ICW1*/
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{
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pic2.mask=0xFF;
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pic2.mask2=0;
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pic2.icw=1;
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pic2.icw1=val;
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pic2.ins = 0;
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pic_updatepending();
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}
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else if (!(val&8)) /*OCW2*/
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{
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if ((val&0xE0)==0x60)
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{
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pic2.ins&=~(1<<(val&7));
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pic_update_mask(&pic2.mask2, pic2.ins);
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pic_updatepending();
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}
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else
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{
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for (c=0;c<8;c++)
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{
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if (pic2.ins&(1<<c))
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{
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pic2.ins &= ~(1<<c);
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pic_update_mask(&pic2.mask2, pic2.ins);
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pic_updatepending();
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return;
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}
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}
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}
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}
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else /*OCW3*/
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{
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if (val&2) pic2.read=(val&1);
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}
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}
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}
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uint8_t pic2_read(uint16_t addr, void *priv)
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{
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if (addr&1) { /*pclog("Read PIC2 mask %02X %04X:%08X\n",pic2.mask,CS,pc);*/ return pic2.mask; }
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if (pic2.read) { /*pclog("Read PIC2 ins %02X %04X:%08X\n",pic2.ins,CS,pc);*/ return pic2.ins; }
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/*pclog("Read PIC2 pend %02X %04X:%08X\n",pic2.pend,CS,pc);*/
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return pic2.pend;
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}
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void pic2_init()
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{
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io_sethandler(0x00a0, 0x0002, pic2_read, NULL, NULL, pic2_write, NULL, NULL, NULL);
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}
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void clearpic()
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{
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pic.pend=pic.ins=0;
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pic_updatepending();
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// pclog("Clear PIC\n");
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}
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int pic_current[16];
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void picint(uint16_t num)
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{
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if (AT && num == (1 << 2))
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num = 1 << 9;
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// pclog("picint : %04X\n", num);
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// if (num == 0x10) pclog("PICINT 10\n");
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if (num>0xFF)
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{
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pic2.pend|=(num>>8);
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if ((pic2.pend&~pic2.mask)&~pic2.mask2)
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pic.pend |= (1 << 2);
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}
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else
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{
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pic.pend|=num;
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}
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// pclog("picint : PEND now %02X %02X\n", pic.pend, pic2.pend);
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pic_updatepending();
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}
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void picintlevel(uint16_t num)
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{
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int c = 0;
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while (!(num & (1 << c))) c++;
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if (AT && c == 2)
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{
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c = 9;
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num = 1 << 9;
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}
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// pclog("INTLEVEL %04X %i\n", num, c);
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if (!pic_current[c])
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{
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pic_current[c]=1;
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if (num>0xFF)
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{
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pic2.pend|=(num>>8);
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}
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else
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{
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pic.pend|=num;
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}
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}
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pic_updatepending();
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}
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void picintc(uint16_t num)
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{
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int c = 0;
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if (!num)
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return;
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while (!(num & (1 << c))) c++;
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if (AT && c == 2)
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{
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c = 9;
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num = 1 << 9;
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}
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// pclog("INTC %04X %i\n", num, c);
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pic_current[c]=0;
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if (num > 0xff)
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{
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pic2.pend &= ~(num >> 8);
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if (!((pic2.pend&~pic2.mask)&~pic2.mask2))
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pic.pend &= ~(1 << 2);
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}
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else
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{
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pic.pend&=~num;
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}
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pic_updatepending();
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}
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uint8_t picinterrupt()
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{
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uint8_t temp=pic.pend&~pic.mask;
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int c;
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for (c = 0; c < 2; c++)
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{
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if (temp & (1 << c))
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{
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pic.pend &= ~(1 << c);
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pic.ins |= (1 << c);
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pic_update_mask(&pic.mask2, pic.ins);
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pic_updatepending();
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return c+pic.vector;
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}
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}
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if (temp & (1 << 2))
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{
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uint8_t temp2 = pic2.pend & ~pic2.mask;
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for (c = 0; c < 8; c++)
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{
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if (temp2 & (1 << c))
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{
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pic2.pend &= ~(1 << c);
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pic2.ins |= (1 << c);
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pic_update_mask(&pic2.mask2, pic2.ins);
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pic.pend &= ~(1 << c);
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pic.ins |= (1 << 2); /*Cascade IRQ*/
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pic_update_mask(&pic.mask2, pic.ins);
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pic_updatepending();
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return c+pic2.vector;
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}
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}
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}
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for (c = 3; c < 8; c++)
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{
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if (temp & (1 << c))
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{
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pic.pend &= ~(1 << c);
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pic.ins |= (1 << c);
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pic_update_mask(&pic.mask2, pic.ins);
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pic_updatepending();
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return c+pic.vector;
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}
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}
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return 0xFF;
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}
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void dumppic()
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{
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pclog("PIC1 : MASK %02X PEND %02X INS %02X VECTOR %02X\n",pic.mask,pic.pend,pic.ins,pic.vector);
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pclog("PIC2 : MASK %02X PEND %02X INS %02X VECTOR %02X\n",pic2.mask,pic2.pend,pic2.ins,pic2.vector);
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}
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