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x86: provide paravirtualized hook for rdtscp

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This patch adds a field in pv_cpu_ops for a paravirtualized hook
for rdtscp, needed for x86_64.

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Glauber de Oliveira Costa 2008-01-30 13:32:05 +01:00 committed by Ingo Molnar
parent f72a9ef979
commit e5aaac4436
2 changed files with 23 additions and 0 deletions
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1
arch/x86/kernel/paravirt.c
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@ -374,6 +374,7 @@ struct pv_cpu_ops pv_cpu_ops = {
.write_msr = native_write_msr_safe,
.read_tsc = native_read_tsc,
.read_pmc = native_read_pmc,
.read_tscp = native_read_tscp,
.load_tr_desc = native_load_tr_desc,
.set_ldt = native_set_ldt,
.load_gdt = native_load_gdt,

22
include/asm-x86/paravirt.h
View File

@ -120,6 +120,7 @@ struct pv_cpu_ops {
u64 (*read_tsc)(void);
u64 (*read_pmc)(int counter);
unsigned long long (*read_tscp)(unsigned int *aux);
/* These two are jmp to, not actually called. */
void (*irq_enable_syscall_ret)(void);
@ -668,6 +669,27 @@ static inline unsigned long long paravirt_read_pmc(int counter)
high = _l >> 32; \
} while(0)
static inline unsigned long long paravirt_rdtscp(unsigned int *aux)
{
return PVOP_CALL1(u64, pv_cpu_ops.read_tscp, aux);
}
#define rdtscp(low, high, aux) \
do { \
int __aux; \
unsigned long __val = paravirt_rdtscp(&__aux); \
(low) = (u32)__val; \
(high) = (u32)(__val >> 32); \
(aux) = __aux; \
} while (0)
#define rdtscpll(val, aux) \
do { \
unsigned long __aux; \
val = paravirt_rdtscp(&__aux); \
(aux) = __aux; \
} while (0)
static inline void load_TR_desc(void)
{
PVOP_VCALL0(pv_cpu_ops.load_tr_desc);