Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / x86 / kernel / cpu / match.c

diff --git a/kernel/arch/x86/kernel/cpu/match.c b/kernel/arch/x86/kernel/cpu/match.c
new file mode 100644 (file)
index 0000000..afa9f0d
--- /dev/null
+++ b/kernel/arch/x86/kernel/cpu/match.c
@@ -0,0 +1,49 @@
+#include <asm/cpu_device_id.h>
+#include <asm/processor.h>
+#include <linux/cpu.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+/**
+ * x86_match_cpu - match current CPU again an array of x86_cpu_ids
+ * @match: Pointer to array of x86_cpu_ids. Last entry terminated with
+ *         {}.
+ *
+ * Return the entry if the current CPU matches the entries in the
+ * passed x86_cpu_id match table. Otherwise NULL.  The match table
+ * contains vendor (X86_VENDOR_*), family, model and feature bits or
+ * respective wildcard entries.
+ *
+ * A typical table entry would be to match a specific CPU
+ * { X86_VENDOR_INTEL, 6, 0x12 }
+ * or to match a specific CPU feature
+ * { X86_FEATURE_MATCH(X86_FEATURE_FOOBAR) }
+ *
+ * Fields can be wildcarded with %X86_VENDOR_ANY, %X86_FAMILY_ANY,
+ * %X86_MODEL_ANY, %X86_FEATURE_ANY or 0 (except for vendor)
+ *
+ * Arrays used to match for this should also be declared using
+ * MODULE_DEVICE_TABLE(x86cpu, ...)
+ *
+ * This always matches against the boot cpu, assuming models and features are
+ * consistent over all CPUs.
+ */
+const struct x86_cpu_id *x86_match_cpu(const struct x86_cpu_id *match)
+{
+       const struct x86_cpu_id *m;
+       struct cpuinfo_x86 *c = &boot_cpu_data;
+
+       for (m = match; m->vendor | m->family | m->model | m->feature; m++) {
+               if (m->vendor != X86_VENDOR_ANY && c->x86_vendor != m->vendor)
+                       continue;
+               if (m->family != X86_FAMILY_ANY && c->x86 != m->family)
+                       continue;
+               if (m->model != X86_MODEL_ANY && c->x86_model != m->model)
+                       continue;
+               if (m->feature != X86_FEATURE_ANY && !cpu_has(c, m->feature))
+                       continue;
+               return m;
+       }
+       return NULL;
+}
+EXPORT_SYMBOL(x86_match_cpu);