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Commit e85eb632 authored by Jan Kiszka's avatar Jan Kiszka Committed by Thomas Gleixner
Browse files

x86/jailhouse: Set up timekeeping



Get the precalibrated frequencies for the TSC and the APIC timer from
the Jailhouse platform info and set the kernel values accordingly.

Signed-off-by: default avatarJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Cc: jailhouse-dev@googlegroups.com
Link: https://lkml.kernel.org/r/b2557426332fc337a74d3141cb920f7dce9ad601.1511770314.git.jan.kiszka@siemens.com
parent 87e65d05
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+17 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@
#include <asm/setup.h>

static __initdata struct jailhouse_setup_data setup_data;
static unsigned int precalibrated_tsc_khz;

static uint32_t jailhouse_cpuid_base(void)
{
@@ -31,6 +32,16 @@ static uint32_t __init jailhouse_detect(void)
	return jailhouse_cpuid_base();
}

static void __init jailhouse_timer_init(void)
{
	lapic_timer_frequency = setup_data.apic_khz * (1000 / HZ);
}

static unsigned long jailhouse_get_tsc(void)
{
	return precalibrated_tsc_khz;
}

static void __init jailhouse_get_smp_config(unsigned int early)
{
	unsigned int cpu;
@@ -66,8 +77,12 @@ static void __init jailhouse_init_platform(void)
	struct setup_data header;
	void *mapping;

	x86_init.timers.timer_init	= jailhouse_timer_init;
	x86_init.mpparse.get_smp_config	= jailhouse_get_smp_config;

	x86_platform.calibrate_cpu	= jailhouse_get_tsc;
	x86_platform.calibrate_tsc	= jailhouse_get_tsc;

	while (pa_data) {
		mapping = early_memremap(pa_data, sizeof(header));
		memcpy(&header, mapping, sizeof(header));
@@ -95,6 +110,8 @@ static void __init jailhouse_init_platform(void)

	pmtmr_ioport = setup_data.pm_timer_address;
	pr_debug("Jailhouse: PM-Timer IO Port: %#x\n", pmtmr_ioport);

	precalibrated_tsc_khz = setup_data.tsc_khz;
}

bool jailhouse_paravirt(void)