1 files changed, 69 insertions, 0 deletions

diff --git a/arch/x86/boot/cpu.c b/arch/x86/boot/cpu.c
new file mode 100644
index 000000000000..2a5c32da5852
--- /dev/null
+++ b/arch/x86/boot/cpu.c
@@ -0,0 +1,69 @@
+/* -*- linux-c -*- ------------------------------------------------------- *
+ *
+ *   Copyright (C) 1991, 1992 Linus Torvalds
+ *   Copyright 2007 rPath, Inc. - All Rights Reserved
+ *
+ *   This file is part of the Linux kernel, and is made available under
+ *   the terms of the GNU General Public License version 2.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * arch/i386/boot/cpu.c
+ *
+ * Check for obligatory CPU features and abort if the features are not
+ * present.
+ */
+
+#include "boot.h"
+#include "bitops.h"
+#include <asm/cpufeature.h>
+
+static char *cpu_name(int level)
+{
+        static char buf[6];
+
+        if (level == 64) {
+                return "x86-64";
+        } else {
+                sprintf(buf, "i%d86", level);
+                return buf;
+        }
+}
+
+int validate_cpu(void)
+{
+        u32 *err_flags;
+        int cpu_level, req_level;
+
+        check_cpu(&cpu_level, &req_level, &err_flags);
+
+        if (cpu_level < req_level) {
+                printf("This kernel requires an %s CPU, ",
+                       cpu_name(req_level));
+                printf("but only detected an %s CPU.\n",
+                       cpu_name(cpu_level));
+                return -1;
+        }
+
+        if (err_flags) {
+                int i, j;
+                puts("This kernel requires the following features "
+                     "not present on the CPU:\n");
+
+                for (i = 0; i < NCAPINTS; i++) {
+                        u32 e = err_flags[i];
+
+                        for (j = 0; j < 32; j++) {
+                                if (e & 1)
+                                        printf("%d:%d ", i, j);
+
+                                e >>= 1;
+                        }
+                }
+                putchar('\n');
+                return -1;
+        } else {
+                return 0;
+        }
+}