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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

arch/x86/kernel/jailhouse.c

+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)