[PATCH 04/15] provide paravirtualized hook for rdtscp
From: Glauber de Oliveira Costa <hidden>
Date: 2007-12-20 20:09:32
Also in:
lkml
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 <redacted> --- arch/x86/kernel/paravirt.c | 1 + include/asm-x86/paravirt.h | 22 ++++++++++++++++++++++ 2 files changed, 23 insertions(+), 0 deletions(-) Index: linux-2.6-x86/arch/x86/kernel/paravirt.c ===================================================================
--- linux-2.6-x86.orig/arch/x86/kernel/paravirt.c 2007-12-20 19:07:15.000000000 -0800
+++ linux-2.6-x86/arch/x86/kernel/paravirt.c 2007-12-20 19:07:22.000000000 -0800@@ -374,6 +374,7 @@ .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,
Index: linux-2.6-x86/include/asm-x86/paravirt.h ===================================================================
--- linux-2.6-x86.orig/include/asm-x86/paravirt.h 2007-12-20 19:07:18.000000000 -0800
+++ linux-2.6-x86/include/asm-x86/paravirt.h 2007-12-20 19:07:22.000000000 -0800@@ -120,6 +120,7 @@ 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 @@ 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);