Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6

[linux-2.6] / arch / i386 / kernel / cpu / amd.c

diff --git a/arch/i386/kernel/cpu/amd.c b/arch/i386/kernel/cpu/amd.c
index 41cfea5..4fec702 100644 (file)
--- a/arch/i386/kernel/cpu/amd.c
+++ b/arch/i386/kernel/cpu/amd.c
@@ -22,6 +22,39 @@
 extern void vide(void);
 __asm__(".align 4\nvide: ret");
 
+#define ENABLE_C1E_MASK         0x18000000
+#define CPUID_PROCESSOR_SIGNATURE       1
+#define CPUID_XFAM              0x0ff00000
+#define CPUID_XFAM_K8           0x00000000
+#define CPUID_XFAM_10H          0x00100000
+#define CPUID_XFAM_11H          0x00200000
+#define CPUID_XMOD              0x000f0000
+#define CPUID_XMOD_REV_F        0x00040000
+
+/* AMD systems with C1E don't have a working lAPIC timer. Check for that. */
+static __cpuinit int amd_apic_timer_broken(void)
+{
+       u32 lo, hi;
+       u32 eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
+       switch (eax & CPUID_XFAM) {
+       case CPUID_XFAM_K8:
+               if ((eax & CPUID_XMOD) < CPUID_XMOD_REV_F)
+                       break;
+       case CPUID_XFAM_10H:
+       case CPUID_XFAM_11H:
+               rdmsr(MSR_K8_ENABLE_C1E, lo, hi);
+               if (lo & ENABLE_C1E_MASK)
+                       return 1;
+                break;
+        default:
+                /* err on the side of caution */
+               return 1;
+        }
+       return 0;
+}
+
+int force_mwait __cpuinitdata;
+
 static void __cpuinit init_amd(struct cpuinfo_x86 *c)
 {
        u32 l, h;
@@ -241,6 +274,12 @@ static void __cpuinit init_amd(struct cpuinfo_x86 *c)
 
        if (cpuid_eax(0x80000000) >= 0x80000006)
                num_cache_leaves = 3;
+
+       if (amd_apic_timer_broken())
+               set_bit(X86_FEATURE_LAPIC_TIMER_BROKEN, c->x86_capability);
+
+       if (c->x86 == 0x10 && !force_mwait)
+               clear_bit(X86_FEATURE_MWAIT, c->x86_capability);
 }
 
 static unsigned int __cpuinit amd_size_cache(struct cpuinfo_x86 * c, unsigned int size)
@@ -280,13 +319,3 @@ int __init amd_init_cpu(void)
        cpu_devs[X86_VENDOR_AMD] = &amd_cpu_dev;
        return 0;
 }
-
-//early_arch_initcall(amd_init_cpu);
-
-static int __init amd_exit_cpu(void)
-{
-       cpu_devs[X86_VENDOR_AMD] = NULL;
-       return 0;
-}
-
-late_initcall(amd_exit_cpu);