x86: geode: MSR cleanup

[linux-2.6-omap-h63xx.git] / include / asm-x86 / tsc.h

diff --git a/include/asm-x86/tsc.h b/include/asm-x86/tsc.h
index 9b7d264897fa4f3a74f46d5710817490713563e4..d2d8eb5b55f532365f9277b5f776109626f7ed4b 100644 (file)
--- a/include/asm-x86/tsc.h
+++ b/include/asm-x86/tsc.h
@@ -17,6 +17,8 @@ typedef unsigned long long cycles_t;
 extern unsigned int cpu_khz;
 extern unsigned int tsc_khz;
 
+extern void disable_TSC(void);
+
 static inline cycles_t get_cycles(void)
 {
        unsigned long long ret = 0;
@@ -25,69 +27,23 @@ static inline cycles_t get_cycles(void)
        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)
+static inline cycles_t vget_cycles(void)
 {
-       unsigned long long ret;
-       unsigned eax, edx;
-
-       /*
-        * Use RDTSCP if possible; it is guaranteed to be synchronous
-        * and doesn't cause a VMEXIT on Hypervisors
-        */
-       alternative_io(ASM_NOP3, ".byte 0x0f,0x01,0xf9", X86_FEATURE_RDTSCP,
-                      ASM_OUTPUT2("=a" (eax), "=d" (edx)),
-                      "a" (0U), "d" (0U) : "ecx", "memory");
-       ret = (((unsigned long long)edx) << 32) | ((unsigned long long)eax);
-       if (ret)
-               return ret;
-
        /*
-        * Don't do an additional sync on CPUs where we know
-        * RDTSC is already synchronous:
+        * We only do VDSOs on TSC capable CPUs, so this shouldnt
+        * access boot_cpu_data (which is not VDSO-safe):
         */
-       alternative_io("cpuid", ASM_NOP2, X86_FEATURE_SYNC_RDTSC,
-                         "=a" (eax), "0" (1) : "ebx","ecx","edx","memory");
-
-       return 0;
-}
-
-static __always_inline cycles_t get_cycles_sync(void)
-{
-       unsigned long long ret;
-       ret = __get_cycles_sync();
-       if (!ret)
-               rdtscll(ret);
-       return ret;
-}
-
-#ifdef CONFIG_PARAVIRT
-/*
- * For paravirt guests, some functionalities are executed through function
- * pointers in the various pvops structures.
- * These function pointers exist inside the kernel and can not
- * be accessed by user space. To avoid this, we make a copy of the
- * get_cycles_sync (called in kernel) but force the use of native_read_tsc.
- * Ideally, the guest should set up it's own clock and vread
- */
-static __always_inline long long vget_cycles_sync(void)
-{
-       unsigned long long ret;
-       ret = __get_cycles_sync();
-       if (!ret)
-               ret = native_read_tsc();
-       return ret;
-}
-#else
-# define vget_cycles_sync() get_cycles_sync()
+#ifndef CONFIG_X86_TSC
+       if (!cpu_has_tsc)
+               return 0;
 #endif
+       return (cycles_t)__native_read_tsc();
+}
 
 extern void tsc_init(void);
 extern void mark_tsc_unstable(char *reason);