c2dcfde827
Clean up the code for crashes during SpeedStep probing on older machines. Signed-off-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
85 lines
1.7 KiB
C
85 lines
1.7 KiB
C
/* -*- linux-c -*- ------------------------------------------------------- *
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright 2007-2008 rPath, Inc. - All Rights Reserved
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*
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* This file is part of the Linux kernel, and is made available under
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* the terms of the GNU General Public License version 2.
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*
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* ----------------------------------------------------------------------- */
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/*
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* arch/x86/boot/cpu.c
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*
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* Check for obligatory CPU features and abort if the features are not
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* present.
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*/
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#include "boot.h"
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#include "cpustr.h"
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static char *cpu_name(int level)
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{
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static char buf[6];
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if (level == 64) {
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return "x86-64";
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} else {
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if (level == 15)
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level = 6;
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sprintf(buf, "i%d86", level);
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return buf;
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}
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}
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int validate_cpu(void)
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{
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u32 *err_flags;
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int cpu_level, req_level;
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const unsigned char *msg_strs;
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check_cpu(&cpu_level, &req_level, &err_flags);
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if (cpu_level < req_level) {
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printf("This kernel requires an %s CPU, ",
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cpu_name(req_level));
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printf("but only detected an %s CPU.\n",
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cpu_name(cpu_level));
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return -1;
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}
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if (err_flags) {
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int i, j;
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puts("This kernel requires the following features "
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"not present on the CPU:\n");
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msg_strs = (const unsigned char *)x86_cap_strs;
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for (i = 0; i < NCAPINTS; i++) {
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u32 e = err_flags[i];
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for (j = 0; j < 32; j++) {
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int n = (i << 5)+j;
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if (*msg_strs < n) {
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/* Skip to the next string */
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do {
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msg_strs++;
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} while (*msg_strs);
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msg_strs++;
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}
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if (e & 1) {
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if (*msg_strs == n && msg_strs[1])
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printf("%s ", msg_strs+1);
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else
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printf("%d:%d ", i, j);
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}
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e >>= 1;
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}
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}
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putchar('\n');
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return -1;
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} else {
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return 0;
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}
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}
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