summaryrefslogtreecommitdiffstats
path: root/arch/x86/include/asm/processor.h
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2009-09-14 07:57:32 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-14 07:57:32 -0700
commitc7208de304ac335d5d58db346bb773a471fc636b (patch)
tree47808484fc3ff8447fe30943a33880bae00d5fee /arch/x86/include/asm/processor.h
parent15b0404272e1513940223cf9eefadfd22804a060 (diff)
parent5367b6887e7d8c870a5da7d9b8c6e9c207684e43 (diff)
downloadop-kernel-dev-c7208de304ac335d5d58db346bb773a471fc636b.zip
op-kernel-dev-c7208de304ac335d5d58db346bb773a471fc636b.tar.gz
Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (22 commits) x86: Fix code patching for paravirt-alternatives on 486 x86, msr: change msr-reg.o to obj-y, and export its symbols x86: Use hard_smp_processor_id() to get apic id for AMD K8 cpus x86, sched: Workaround broken sched domain creation for AMD Magny-Cours x86, mcheck: Use correct cpumask for shared bank4 x86, cacheinfo: Fixup L3 cache information for AMD multi-node processors x86: Fix CPU llc_shared_map information for AMD Magny-Cours x86, msr: Fix msr-reg.S compilation with gas 2.16.1, on 32-bit too x86: Move kernel_fpu_using to irq_fpu_usable in asm/i387.h x86, msr: fix msr-reg.S compilation with gas 2.16.1 x86, msr: Export the register-setting MSR functions via /dev/*/msr x86, msr: Create _on_cpu helpers for {rw,wr}msr_safe_regs() x86, msr: Have the _safe MSR functions return -EIO, not -EFAULT x86, msr: CFI annotations, cleanups for msr-reg.S x86, asm: Make _ASM_EXTABLE() usable from assembly code x86, asm: Add 32-bit versions of the combined CFI macros x86, AMD: Disable wrongly set X86_FEATURE_LAHF_LM CPUID bit x86, msr: Rewrite AMD rd/wrmsr variants x86, msr: Add rd/wrmsr interfaces with preset registers x86: add specific support for Intel Atom architecture ...
Diffstat (limited to 'arch/x86/include/asm/processor.h')
-rw-r--r--arch/x86/include/asm/processor.h16
1 files changed, 13 insertions, 3 deletions
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index ac7e796..e08ea04 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -713,13 +713,23 @@ static inline void cpu_relax(void)
rep_nop();
}
-/* Stop speculative execution: */
+/* Stop speculative execution and prefetching of modified code. */
static inline void sync_core(void)
{
int tmp;
- asm volatile("cpuid" : "=a" (tmp) : "0" (1)
- : "ebx", "ecx", "edx", "memory");
+#if defined(CONFIG_M386) || defined(CONFIG_M486)
+ if (boot_cpu_data.x86 < 5)
+ /* There is no speculative execution.
+ * jmp is a barrier to prefetching. */
+ asm volatile("jmp 1f\n1:\n" ::: "memory");
+ else
+#endif
+ /* cpuid is a barrier to speculative execution.
+ * Prefetched instructions are automatically
+ * invalidated when modified. */
+ asm volatile("cpuid" : "=a" (tmp) : "0" (1)
+ : "ebx", "ecx", "edx", "memory");
}
static inline void __monitor(const void *eax, unsigned long ecx,
OpenPOWER on IntegriCloud