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Rewrote timer code.

Browse source 
The new code is based on timestamps, rather than delays. This eliminates the
need to update every timer in timer_process(), which cost a non-trivial amount
of CPU time on low-end machines.

This involved changes to every user of the timer code, so this change almost
certainly introduces bugs.
This commit is contained in:
SarahW 2018-08-02 22:06:10 +01:00
commit a7d006b637
79 changed files with 1050 additions and 1033 deletions
Download patch file Download diff file Expand all files Collapse all files

9
src/386.c
View file

@ -222,12 +222,11 @@ void exec386(int cycs)
// output=3;
while (cycles>0)
{
int cycle_period = (timer_count >> TIMER_SHIFT) + 1;
int cycle_period = (timer_target - (uint32_t)tsc) + 1;
x86_was_reset = 0;
cycdiff=0;
oldcyc=cycles;
timer_start_period(cycles << TIMER_SHIFT);
// pclog("%i %02X\n", ins, ram[8]);
while (cycdiff < cycle_period)
{
@ -257,7 +256,7 @@ dontprint=0;
if (output == 3)
{
pclog("%04X(%06X):%04X : %08X %08X %08X %08X %04X %04X %04X(%08X) %04X %04X %04X(%08X) %08X %08X %08X SP=%04X:%08X %02X %04X %i %08X %08X %i %i %02X %02X %02X %02X %02X %f %02X%02X %02X%02X %02X%02X %02X\n",CS,cs,cpu_state.pc,EAX,EBX,ECX,EDX,CS,DS,ES,es,FS,GS,SS,ss,EDI,ESI,EBP,SS,ESP,opcode,flags,ins,0, ldt.base, CPL, stack32, pic.pend, pic.mask, pic.mask2, pic2.pend, pic2.mask, pit.c[0], ram[0xB270+0x3F5], ram[0xB270+0x3F4], ram[0xB270+0x3F7], ram[0xB270+0x3F6], ram[0xB270+0x3F9], ram[0xB270+0x3F8], ram[0x4430+0x0D49]);
pclog("%04X(%06X):%04X : %08X %08X %08X %08X %04X %04X %04X(%08X) %04X %04X %04X(%08X) %08X %08X %08X SP=%04X:%08X %02X %04X %i %08X %08X %i %i %02X %02X %02X %02X %02X\n",CS,cs,cpu_state.pc,EAX,EBX,ECX,EDX,CS,DS,ES,es,FS,GS,SS,ss,EDI,ESI,EBP,SS,ESP,opcode,flags,ins,0, ldt.base, CPL, stack32, pic.pend, pic.mask, pic.mask2, pic2.pend, pic2.mask);
}
cpu_state.pc++;
x86_opcodes[(opcode | cpu_state.op32) & 0x3ff](fetchdat);
@ -381,7 +380,7 @@ dontprint=0;
}
tsc += cycdiff;
timer_end_period(cycles << TIMER_SHIFT);
if (TIMER_VAL_LESS_THAN_VAL(timer_target, (uint32_t)tsc))
timer_process();
}
}