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/* -*- 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 "bitops.h"
#include <asm/cpufeature.h>
#include "cpustr.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;
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++) {
int n = (i << 5)+j;
if (*msg_strs < n) {
/* Skip to the next string */
do {
msg_strs++;
} while (*msg_strs);
msg_strs++;
}
if (e & 1) {
if (*msg_strs == n && msg_strs[1])
printf("%s ", msg_strs+1);
else
printf("%d:%d ", i, j);
}
e >>= 1;
}
}
putchar('\n');
return -1;
} else {
return 0;
}
}
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