From 2272b0e03ea5731aca058eaf79c9955b36f0c083 Mon Sep 17 00:00:00 2001 From: Andres Salomon Date: Tue, 6 Mar 2007 01:42:05 -0800 Subject: [PATCH] i386: make x86_64 tsc header require i386 rather than vice-versa Prior to commit 95492e4646e5de8b43d9a7908d6177fb737b61f0 ([PATCH] x86: rewrite SMP TSC sync code), the headers in asm-i386 did not really require anything in include/asm-x86_64. This means that distributions such as fedora did not include asm-x86_64 in kernel-devel headers for i386. Ingo's commit changed that, and broke things. This is easy enough to hack around in package builds by just including asm-x86_64 on i386, but that's kind of annoying. If anything, x86_64 should depend upon i386, not the other way around. This patch changes it so that asm-x86_64/tsc.h includes asm-i386/tsc.h, rather than vice-versa. Signed-off-by: Andres Salomon Acked-by: Ingo Molnar Cc: Andi Kleen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/asm-i386/tsc.h | 68 +++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 67 insertions(+), 1 deletion(-) (limited to 'include/asm-i386') diff --git a/include/asm-i386/tsc.h b/include/asm-i386/tsc.h index e997891cc7c..84016ff481b 100644 --- a/include/asm-i386/tsc.h +++ b/include/asm-i386/tsc.h @@ -1 +1,67 @@ -#include +/* + * linux/include/asm-i386/tsc.h + * + * i386 TSC related functions + */ +#ifndef _ASM_i386_TSC_H +#define _ASM_i386_TSC_H + +#include + +/* + * Standard way to access the cycle counter. + */ +typedef unsigned long long cycles_t; + +extern unsigned int cpu_khz; +extern unsigned int tsc_khz; + +static inline cycles_t get_cycles(void) +{ + unsigned long long ret = 0; + +#ifndef CONFIG_X86_TSC + if (!cpu_has_tsc) + return 0; +#endif + +#if defined(CONFIG_X86_GENERIC) || defined(CONFIG_X86_TSC) + rdtscll(ret); +#endif + return ret; +} + +/* Like get_cycles, but make sure the CPU is synchronized. */ +static __always_inline cycles_t get_cycles_sync(void) +{ + unsigned long long ret; +#ifdef X86_FEATURE_SYNC_RDTSC + unsigned eax; + + /* + * Don't do an additional sync on CPUs where we know + * RDTSC is already synchronous: + */ + alternative_io("cpuid", ASM_NOP2, X86_FEATURE_SYNC_RDTSC, + "=a" (eax), "0" (1) : "ebx","ecx","edx","memory"); +#else + sync_core(); +#endif + rdtscll(ret); + + return ret; +} + +extern void tsc_init(void); +extern void mark_tsc_unstable(void); +extern int unsynchronized_tsc(void); +extern void init_tsc_clocksource(void); + +/* + * Boot-time check whether the TSCs are synchronized across + * all CPUs/cores: + */ +extern void check_tsc_sync_source(int cpu); +extern void check_tsc_sync_target(void); + +#endif -- cgit v1.2.3