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-rw-r--r--arch/x86/boot/cpu.c69
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 00000000000..2a5c32da585
--- /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;
+ }
+}