2 files changed, 23 insertions, 1 deletions

diff --git a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
index 6e44519960c8..3b5ea3831c26 100644
--- a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
+++ b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
@@ -929,7 +929,8 @@ static int fill_powernow_table_pstate(struct powernow_k8_data *data,
                 powernow_table[i].index = index;
 
                 /* Frequency may be rounded for these */
-                if (boot_cpu_data.x86 == 0x10 || boot_cpu_data.x86 == 0x11) {
+                if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
+                                 || boot_cpu_data.x86 == 0x11) {
                         powernow_table[i].frequency =
                                 freq_from_fid_did(lo & 0x3f, (lo >> 6) & 7);
                 } else
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 7e1cca13af35..1366c7cfd483 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -47,6 +47,27 @@ static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
                 (c->x86 == 0x6 && c->x86_model >= 0x0e))
                 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
 
+        /*
+         * Atom erratum AAE44/AAF40/AAG38/AAH41:
+         *
+         * A race condition between speculative fetches and invalidating
+         * a large page.  This is worked around in microcode, but we
+         * need the microcode to have already been loaded... so if it is
+         * not, recommend a BIOS update and disable large pages.
+         */
+        if (c->x86 == 6 && c->x86_model == 0x1c && c->x86_mask <= 2) {
+                u32 ucode, junk;
+
+                wrmsr(MSR_IA32_UCODE_REV, 0, 0);
+                sync_core();
+                rdmsr(MSR_IA32_UCODE_REV, junk, ucode);
+
+                if (ucode < 0x20e) {
+                        printk(KERN_WARNING "Atom PSE erratum detected, BIOS microcode update recommended\n");
+                        clear_cpu_cap(c, X86_FEATURE_PSE);
+                }
+        }
+
 #ifdef CONFIG_X86_64
         set_cpu_cap(c, X86_FEATURE_SYSENTER32);
 #else