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Code Issues Releases Wiki Activity

timer: add tsctimer_setfreq() 

Add function to set tsc frequency directly, without calibration.
Also tweak timer setup functions a bit: skip setup in case TimerPort
has not the default value any more, i.e. another timer has been setup
already.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 20200310102248.28412-1-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2020-03-10 11:22:45 +01:00
parent 24d3938ca9
commit 67cbfedb33
2 changed files with 26 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
src/hw/timer.c
View File

@ -101,8 +101,10 @@ tsctimer_setup(void)
void
timer_setup(void)
{
if (!CONFIG_TSC_TIMER || (CONFIG_PMTIMER && TimerPort != PORT_PIT_COUNTER0))
if (!CONFIG_TSC_TIMER)
return;
if (TimerPort != PORT_PIT_COUNTER0)
return; // have timer already
// Check if CPU has a timestamp counter
u32 eax, ebx, ecx, edx, cpuid_features = 0;
@ -113,11 +115,33 @@ timer_setup(void)
tsctimer_setup();
}
void
tsctimer_setfreq(u32 khz, const char *src)
{
if (!CONFIG_TSC_TIMER)
return;
if (TimerPort != PORT_PIT_COUNTER0)
return; // have timer already
TimerKHz = khz;
ShiftTSC = 0;
while (TimerKHz >= 6000) {
ShiftTSC++;
TimerKHz = (TimerKHz + 1) >> 1;
}
TimerPort = 0;
dprintf(1, "CPU Mhz=%u (%s)\n", (TimerKHz << ShiftTSC) / 1000, src);
}
void
pmtimer_setup(u16 ioport)
{
if (!CONFIG_PMTIMER)
return;
if (TimerPort != PORT_PIT_COUNTER0)
return; // have timer already
dprintf(1, "Using pmtimer, ioport 0x%x\n", ioport);
TimerPort = ioport;
TimerKHz = DIV_ROUND_UP(PMTIMER_HZ, 1000);

1
src/util.h
View File

@ -171,6 +171,7 @@ void sdcard_setup(void);
// hw/timer.c
void timer_setup(void);
void pmtimer_setup(u16 ioport);
void tsctimer_setfreq(u32 khz, const char *src);
u32 timer_calc(u32 msecs);
u32 timer_calc_usec(u32 usecs);
int timer_check(u32 end);