Added significant improvements to the new pit. It's about ready for use.
The only big thing it's lacking right now is testing, which is a little difficult to do, considering the new interface. Oh, well.
This commit is contained in:
Gregory Alexander
parent
4f1c151520
commit
85b5157a7e
@ -138,6 +138,98 @@
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init();
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}
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void pit_82C54::decrement_multiple(counter_type & thisctr, Bit32u cycles) {
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while(cycles>0) {
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if(cycles<=thisctr.count_binary) {
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thisctr.count_binary-=cycles;
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cycles-=cycles;
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set_count_to_binary(thisctr);
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} else {
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cycles-=(thisctr.count_binary+1);
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thisctr.count_binary-=thisctr.count_binary;
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set_count_to_binary(thisctr);
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decrement(thisctr);
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}
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}
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}
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void pit_82C54::clock_multiple(Bit8u cnum, Bit32u cycles) {
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if(cnum>MAX_COUNTER) {
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BX_ERROR(("Counter number too high in clock"));
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} else {
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counter_type & thisctr = counter[cnum];
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while(cycles>0) {
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if(thisctr.next_change_time==0) {
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if(thisctr.count_written) {
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switch(thisctr.mode) {
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case 0:
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if(thisctr.GATE && (thisctr.write_state!=MSByte_multiple)) {
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decrement_multiple(thisctr, cycles);
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}
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break;
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case 1:
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decrement_multiple(thisctr, cycles);
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break;
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case 2:
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if( (!thisctr.first_pass) && thisctr.GATE ) {
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decrement_multiple(thisctr, cycles);
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}
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break;
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case 3:
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if( (!thisctr.first_pass) && thisctr.GATE ) {
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decrement_multiple(thisctr, 2*cycles);
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}
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break;
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case 4:
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if(thisctr.GATE) {
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decrement_multiple(thisctr, cycles);
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}
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break;
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case 5:
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decrement_multiple(thisctr, cycles);
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break;
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default:
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break;
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}
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}
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cycles-=cycles;
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} else {
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switch(thisctr.mode) {
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case 0:
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case 1:
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case 2:
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case 4:
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case 5:
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if( thisctr.next_change_time > cycles ) {
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decrement_multiple(thisctr,cycles);
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thisctr.next_change_time-=cycles;
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cycles-=cycles;
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} else {
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decrement_multiple(thisctr,(thisctr.next_change_time-1));
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cycles-=thisctr.next_change_time;
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clock(cnum);
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}
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break;
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case 3:
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if( thisctr.next_change_time > cycles ) {
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decrement_multiple(thisctr,cycles*2);
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thisctr.next_change_time-=cycles;
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cycles-=cycles;
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} else {
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decrement_multiple(thisctr,(thisctr.next_change_time-1)*2);
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cycles-=thisctr.next_change_time;
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clock(cnum);
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}
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break;
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default:
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cycles-=cycles;
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break;
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}
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}
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}
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}
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}
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void pit_82C54::clock(Bit8u cnum) {
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if(cnum>MAX_COUNTER) {
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BX_ERROR(("Counter number too high in clock"));
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@ -148,15 +240,29 @@
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if(thisctr.count_written) {
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if(thisctr.null_count) {
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set_count(thisctr, thisctr.inlatch);
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if(thisctr.GATE) {
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thisctr.next_change_time=thisctr.count_binary;
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} else {
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thisctr.next_change_time=0;
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}
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thisctr.null_count=0;
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} else {
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if(thisctr.GATE && (thisctr.write_state!=MSByte_multiple)) {
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decrement(thisctr);
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if((!thisctr.count) && (!thisctr.OUT)) {
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set_OUT(thisctr,1);
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if(!thisctr.OUT) {
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thisctr.next_change_time=thisctr.count_binary;
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if(!thisctr.count) {
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set_OUT(thisctr,1);
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}
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} else {
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thisctr.next_change_time=0;
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}
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} else {
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thisctr.next_change_time=0; //if the clock isn't moving.
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}
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}
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} else {
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thisctr.next_change_time=0; //default to 0.
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}
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thisctr.triggerGATE=0;
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break;
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@ -164,6 +270,7 @@
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if(thisctr.count_written) {
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if(thisctr.triggerGATE) {
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set_count(thisctr, thisctr.inlatch);
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thisctr.next_change_time=thisctr.count_binary;
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thisctr.null_count=0;
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set_OUT(thisctr,0);
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if(thisctr.write_state==MSByte_multiple) {
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@ -171,10 +278,17 @@
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}
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} else {
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decrement(thisctr);
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if((thisctr.count==0) && (!thisctr.OUT)) {
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set_OUT(thisctr,1);
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if(!thisctr.OUT) {
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thisctr.next_change_time=thisctr.count_binary;
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if(thisctr.count==0) {
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set_OUT(thisctr,1);
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}
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} else {
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thisctr.next_change_time=0;
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}
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}
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} else {
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thisctr.next_change_time=0; //default to 0.
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}
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thisctr.triggerGATE=0;
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break;
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@ -182,6 +296,7 @@
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if(thisctr.count_written) {
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if(thisctr.triggerGATE || thisctr.first_pass) {
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set_count(thisctr, thisctr.inlatch);
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thisctr.next_change_time=thisctr.count_binary-1;
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thisctr.null_count=0;
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if(thisctr.inlatch==1) {
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BX_ERROR(("ERROR: count of 1 is invalid in pit mode 2."));
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@ -196,12 +311,18 @@
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} else {
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if(thisctr.GATE) {
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decrement(thisctr);
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thisctr.next_change_time=thisctr.count_binary-1;
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if(thisctr.count==1) {
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thisctr.next_change_time=1;
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set_OUT(thisctr,0);
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thisctr.first_pass=1;
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}
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} else {
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thisctr.next_change_time=0;
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}
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}
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} else {
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thisctr.next_change_time=0;
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}
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thisctr.triggerGATE=0;
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break;
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@ -209,8 +330,13 @@
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if(thisctr.count_written) {
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if( (thisctr.triggerGATE || thisctr.first_pass
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|| thisctr.state_bit_2) && thisctr.GATE ) {
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set_count(thisctr, thisctr.inlatch);
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set_count(thisctr, thisctr.inlatch & 0xFFFE);
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thisctr.state_bit_1=thisctr.inlatch & 0x1;
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if( (!thisctr.OUT) || (!(thisctr.state_bit_1))) {
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thisctr.next_change_time=(thisctr.count_binary/2)-1;
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} else {
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thisctr.next_change_time=thisctr.count_binary/2;
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}
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thisctr.null_count=0;
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if(thisctr.inlatch==1) {
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BX_ERROR(("Count of 1 is invalid in pit mode 3."));
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@ -229,16 +355,27 @@
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if(thisctr.GATE) {
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decrement(thisctr);
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decrement(thisctr);
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if( (!thisctr.OUT) || (!(thisctr.state_bit_1))) {
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thisctr.next_change_time=(thisctr.count_binary/2)-1;
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} else {
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thisctr.next_change_time=thisctr.count_binary/2;
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}
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if(thisctr.count==0) {
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thisctr.state_bit_2=1;
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thisctr.next_change_time=1;
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}
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if( (thisctr.count==2) &&
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( (!thisctr.OUT) || (!(thisctr.state_bit_1)))
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) {
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thisctr.state_bit_2=1;
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thisctr.next_change_time=1;
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}
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} else {
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thisctr.next_change_time=0;
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}
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}
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} else {
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thisctr.next_change_time=0;
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}
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thisctr.triggerGATE=0;
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break;
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@ -249,6 +386,11 @@
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}
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if(thisctr.null_count) {
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set_count(thisctr, thisctr.inlatch);
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if(thisctr.GATE) {
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thisctr.next_change_time=thisctr.count_binary;
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} else {
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thisctr.next_change_time=0;
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}
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thisctr.null_count=0;
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if(thisctr.write_state==MSByte_multiple) {
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BX_ERROR(("Undefined behavior when loading a half loaded count."));
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@ -257,12 +399,22 @@
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} else {
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if(thisctr.GATE) {
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decrement(thisctr);
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if( (!thisctr.count) && thisctr.first_pass) {
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set_OUT(thisctr,0);
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thisctr.first_pass=0;
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if(thisctr.first_pass) {
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thisctr.next_change_time=thisctr.count_binary;
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if(!thisctr.count) {
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set_OUT(thisctr,0);
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thisctr.next_change_time=1;
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thisctr.first_pass=0;
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}
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} else {
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thisctr.next_change_time=0;
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}
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} else {
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thisctr.next_change_time=0;
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}
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}
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} else {
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thisctr.next_change_time=0;
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}
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thisctr.triggerGATE=0;
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break;
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@ -273,35 +425,43 @@
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}
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if(thisctr.triggerGATE) {
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set_count(thisctr, thisctr.inlatch);
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thisctr.next_change_time=thisctr.count_binary;
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thisctr.null_count=0;
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if(thisctr.write_state==MSByte_multiple) {
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BX_ERROR(("Undefined behavior when loading a half loaded count."));
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}
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thisctr.first_pass=1;
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} else {
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if(thisctr.GATE) {
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decrement(thisctr);
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if( (!thisctr.count) && thisctr.first_pass) {
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decrement(thisctr);
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if(thisctr.first_pass) {
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thisctr.next_change_time=thisctr.count_binary;
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if(!thisctr.count) {
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set_OUT(thisctr,0);
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thisctr.next_change_time=1;
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thisctr.first_pass=0;
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}
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} else {
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thisctr.next_change_time=0;
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}
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}
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} else {
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thisctr.next_change_time=0;
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}
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thisctr.triggerGATE=0;
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break;
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default:
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BX_ERROR(("Mode not implemented."));
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thisctr.next_change_time=0;
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thisctr.triggerGATE=0;
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break;
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}
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}
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}
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void pit_82C54::clock_all(void) {
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clock(0);
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clock(1);
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clock(2);
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void pit_82C54::clock_all(Bit32u cycles) {
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clock_multiple(0,cycles);
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clock_multiple(1,cycles);
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clock_multiple(2,cycles);
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}
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Bit8u pit_82C54::read(Bit8u address) {
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@ -442,6 +602,7 @@
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} else {
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set_OUT(thisctr, 0);
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}
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thisctr.next_change_time=0;
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}
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}
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} else {
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@ -473,18 +634,28 @@
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if(thisctr.write_state==MSByte_multiple) {
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set_OUT(thisctr,0);
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}
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thisctr.next_change_time=1;
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break;
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case 1:
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if(thisctr.triggerGATE) { //for initial writes, if already saw trigger.
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thisctr.next_change_time=1;
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} //Otherwise, no change.
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break;
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case 6:
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case 2:
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thisctr.next_change_time=1; //FIXME: this could be loosened.
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break;
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case 7:
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case 3:
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thisctr.next_change_time=1; //FIXME: this could be loosened.
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break;
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case 4:
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thisctr.next_change_time=1;
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break;
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case 5:
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if(thisctr.triggerGATE) { //for initial writes, if already saw trigger.
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thisctr.next_change_time=1;
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} //Otherwise, no change.
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break;
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}
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}
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@ -495,24 +666,86 @@
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BX_ERROR(("Counter number incorrect in 82C54 set_GATE"));
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} else {
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counter_type & thisctr = counter[cnum];
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if((!thisctr.GATE)&&data) {
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thisctr.triggerGATE=1;
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}
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thisctr.GATE=data;
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switch(thisctr.mode) {
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case 2:
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if(!data) {
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set_OUT(thisctr,1);
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if( (thisctr.GATE&&data) || (!(thisctr.GATE||data)) ) {
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thisctr.GATE=data;
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if(thisctr.GATE) {
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thisctr.triggerGATE=1;
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}
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break;
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case 3:
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if(!data) {
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set_OUT(thisctr,1);
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thisctr.first_pass=1;
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switch(thisctr.mode) {
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case 0:
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if(data && thisctr.count_written) {
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if(thisctr.null_count) {
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thisctr.next_change_time=1;
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} else {
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if( (!thisctr.OUT) &&
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(thisctr.write_state!=MSByte_multiple)
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) {
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thisctr.next_change_time=thisctr.count_binary;
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} else {
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thisctr.next_change_time=0;
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}
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}
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} else {
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if(thisctr.null_count) {
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thisctr.next_change_time=1;
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} else {
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thisctr.next_change_time=0;
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}
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}
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break;
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case 1:
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if(data && thisctr.count_written) { //only triggers cause a change.
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thisctr.next_change_time=1;
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}
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break;
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case 2:
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if(!data) {
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set_OUT(thisctr,1);
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thisctr.next_change_time=0;
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} else {
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if(thisctr.count_written) {
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thisctr.next_change_time=1;
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} else {
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thisctr.next_change_time=0;
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}
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}
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break;
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case 3:
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if(!data) {
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set_OUT(thisctr,1);
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thisctr.first_pass=1;
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thisctr.next_change_time=0;
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} else {
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if(thisctr.count_written) {
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thisctr.next_change_time=1;
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} else {
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thisctr.next_change_time=0;
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}
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}
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break;
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case 4:
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if(!thisctr.OUT || thisctr.null_count) {
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thisctr.next_change_time=1;
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} else {
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if(data && thisctr.count_written) {
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if(thisctr.first_pass) {
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thisctr.next_change_time=thisctr.count_binary;
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} else {
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thisctr.next_change_time=0;
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}
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} else {
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thisctr.next_change_time=0;
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}
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}
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break;
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case 5:
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if(data && thisctr.count_written) { //only triggers cause a change.
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thisctr.next_change_time=1;
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}
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break;
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default:
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break;
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}
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break;
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default:
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break;
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}
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}
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}
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@ -535,3 +768,24 @@
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}
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}
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Bit32u pit_82C54::get_clock_event_time(Bit8u cnum) {
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if(cnum>MAX_COUNTER) {
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BX_ERROR(("Counter number incorrect in 82C54 read_GATE"));
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return 0;
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} else {
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return counter[cnum].next_change_time;
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}
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}
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Bit32u pit_82C54::get_next_event_time(void) {
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Bit32u out;
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Bit32u time0=get_clock_event_time(0);
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Bit32u time1=get_clock_event_time(1);
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Bit32u time2=get_clock_event_time(2);
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out=time0;
|
||||
if(time1 && (time1<out))
|
||||
out=time1;
|
||||
if(time2 && (time2<out))
|
||||
out=time2;
|
||||
}
|
||||
|
||||
@ -68,6 +68,8 @@ private:
|
||||
bool first_pass; //Whether or not this is the first loaded count.
|
||||
bool state_bit_1; //Miscelaneous state bits.
|
||||
bool state_bit_2;
|
||||
Bit32u next_change_time; //Next time something besides count changes.
|
||||
//0 means never.
|
||||
};
|
||||
|
||||
counter_type counter[3];
|
||||
@ -86,23 +88,26 @@ private:
|
||||
|
||||
void decrement (counter_type & thisctr);
|
||||
|
||||
public:
|
||||
void init (void);
|
||||
|
||||
pit_82C54 (void);
|
||||
void decrement_multiple(counter_type & thisctr, Bit32u cycles);
|
||||
|
||||
void clock(Bit8u cnum);
|
||||
|
||||
void clock_all(void);
|
||||
public:
|
||||
void init (void);
|
||||
pit_82C54 (void);
|
||||
|
||||
void clock_all(Bit32u cycles);
|
||||
void clock_multiple(Bit8u cnum, Bit32u cycles);
|
||||
|
||||
Bit8u read(Bit8u address);
|
||||
|
||||
void write(Bit8u address, Bit8u data);
|
||||
|
||||
void set_GATE(Bit8u cnum, bool data);
|
||||
bool read_GATE(Bit8u cnum);
|
||||
|
||||
bool read_OUT(Bit8u cnum);
|
||||
|
||||
bool read_GATE(Bit8u cnum);
|
||||
Bit32u get_clock_event_time(Bit8u cnum);
|
||||
Bit32u get_next_event_time(void);
|
||||
|
||||
};
|
||||
|
||||
@ -236,16 +236,22 @@ bx_kbd_port61h_write(Bit8u value)
|
||||
Boolean
|
||||
bx_pit2_c::periodic( Bit32u usec_delta )
|
||||
{
|
||||
Bit32u i;
|
||||
Bit32u i=0;
|
||||
Boolean prev_timer0_out = BX_PIT2_THIS s.timer.read_OUT(0);
|
||||
Boolean want_interrupt = 0;
|
||||
|
||||
for(i=0; i<usec_delta; i++) {
|
||||
BX_PIT2_THIS s.timer.clock_all();
|
||||
while(usec_delta>0) {
|
||||
Bit32u maxchange=BX_PIT2_THIS s.timer.get_next_event_time();
|
||||
Bit32u timedelta=maxchange;
|
||||
if((maxchange==0) || (maxchange>usec_delta)) {
|
||||
timedelta=usec_delta;
|
||||
}
|
||||
BX_PIT2_THIS s.timer.clock_all(timedelta);
|
||||
if ( (prev_timer0_out==0) && ((BX_PIT2_THIS s.timer.read_OUT(0))==1) ) {
|
||||
want_interrupt=1;
|
||||
}
|
||||
prev_timer0_out=BX_PIT2_THIS s.timer.read_OUT(0);
|
||||
usec_delta-=timedelta;
|
||||
}
|
||||
|
||||
return(want_interrupt);
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user