1 files changed, 85 insertions, 0 deletions
diff --git a/arch/x86/boot/cpu.c b/arch/x86/boot/cpu.c
new file mode 100644
index 00000000..6ec6bb6e
--- /dev/null
+++ b/arch/x86/boot/cpu.c
@@ -0,0 +1,85 @@
+/* -*- linux-c -*- ------------------------------------------------------- *
+ *
+ *   Copyright (C) 1991, 1992 Linus Torvalds
+ *   Copyright 2007-2008 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/x86/boot/cpu.c
+ *
+ * Check for obligatory CPU features and abort if the features are not
+ * present.
+ */
+
+#include "boot.h"
+#include "cpustr.h"
+
+static char *cpu_name(int level)
+{
+	static char buf[6];
+
+	if (level == 64) {
+		return "x86-64";
+	} else {
+		if (level == 15)
+			level = 6;
+		sprintf(buf, "i%d86", level);
+		return buf;
+	}
+}
+
+int validate_cpu(void)
+{
+	u32 *err_flags;
+	int cpu_level, req_level;
+	const unsigned char *msg_strs;
+
+	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");
+
+		msg_strs = (const unsigned char *)x86_cap_strs;
+
+		for (i = 0; i < NCAPINTS; i++) {
+			u32 e = err_flags[i];
+
+			for (j = 0; j < 32; j++) {
+				if (msg_strs[0] < i ||
+				    (msg_strs[0] == i && msg_strs[1] < j)) {
+					/* Skip to the next string */
+					msg_strs += 2;
+					while (*msg_strs++)
+						;
+				}
+				if (e & 1) {
+					if (msg_strs[0] == i &&
+					    msg_strs[1] == j &&
+					    msg_strs[2])
+						printf("%s ", msg_strs+2);
+					else
+						printf("%d:%d ", i, j);
+				}
+				e >>= 1;
+			}
+		}
+		putchar('\n');
+		return -1;
+	} else {
+		return 0;
+	}
+}