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Add ACPI Timer as the primary TSC correction source and PIT Timer as fallback

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This commit is contained in:
Sam Demeulemeester
2022-06-12 22:32:30 +02:00
committed by Sam Demeulemeester
parent eac4d03462
commit a5576974cf
8 changed files with 124 additions and 41 deletions
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34
system/cpuinfo.c
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@@ -33,7 +33,6 @@
// Constants
//------------------------------------------------------------------------------
#define PIT_TICKS_50mS 59659 // PIT clock is 1.193182MHz
#define BENCH_MIN_START_ADR 0x1000000 // 16MB
//------------------------------------------------------------------------------
@@ -861,37 +860,6 @@ static void determine_cpu_model(void)
}
}
static void measure_cpu_speed(void)
{
if (cpuid_info.flags.rdtsc == 0) {
return;
}
// Set up timer
outb((inb(0x61) & ~0x02) | 0x01, 0x61);
outb(0xb0, 0x43);
outb(PIT_TICKS_50mS & 0xff, 0x42);
outb(PIT_TICKS_50mS >> 8, 0x42);
uint32_t start_time;
rdtscl(start_time);
int loops = 0;
do {
loops++;
} while ((inb(0x61) & 0x20) == 0);
uint32_t end_time;
rdtscl(end_time);
uint32_t run_time = end_time - start_time;
// Make sure we have a credible result
if (loops >= 4 && run_time >= 50000) {
clks_per_msec = run_time / 50;
}
}
static uint32_t memspeed(uintptr_t src, uint32_t len, int iter)
{
uintptr_t dst;
@@ -1084,8 +1052,6 @@ void cpuinfo_init(void)
determine_cache_size();
determine_cpu_model();
measure_cpu_speed();
}
void membw_init(void)