i386: move kernel/cpu

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 50 insertions, 0 deletions

diff --git a/arch/x86/kernel/cpu/addon_cpuid_features.c b/arch/x86/kernel/cpu/addon_cpuid_features.c
new file mode 100644
index 000000000000..3e91d3ee26ec
--- /dev/null
+++ b/arch/x86/kernel/cpu/addon_cpuid_features.c
@@ -0,0 +1,50 @@
+
+/*
+ *      Routines to indentify additional cpu features that are scattered in
+ *      cpuid space.
+ */
+
+#include <linux/cpu.h>
+
+#include <asm/processor.h>
+
+struct cpuid_bit {
+        u16 feature;
+        u8 reg;
+        u8 bit;
+        u32 level;
+};
+
+enum cpuid_regs {
+        CR_EAX = 0,
+        CR_ECX,
+        CR_EDX,
+        CR_EBX
+};
+
+void __cpuinit init_scattered_cpuid_features(struct cpuinfo_x86 *c)
+{
+        u32 max_level;
+        u32 regs[4];
+        const struct cpuid_bit *cb;
+
+        static const struct cpuid_bit cpuid_bits[] = {
+                { X86_FEATURE_IDA, CR_EAX, 1, 0x00000006 },
+                { 0, 0, 0, 0 }
+        };
+
+        for (cb = cpuid_bits; cb->feature; cb++) {
+
+                /* Verify that the level is valid */
+                max_level = cpuid_eax(cb->level & 0xffff0000);
+                if (max_level < cb->level ||
+                    max_level > (cb->level | 0xffff))
+                        continue;
+
+                cpuid(cb->level, &regs[CR_EAX], &regs[CR_EBX],
+                        &regs[CR_ECX], &regs[CR_EDX]);
+
+                if (regs[cb->reg] & (1 << cb->bit))
+                        set_bit(cb->feature, c->x86_capability);
+        }
+}