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x86 setup: print missing CPU features in cleartext

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Instead of obscure numbers, print the list of missing CPU features in
cleartext.  To conserve space, use a host program (mkcpustr.c) to
produce a compact list of mandatory features only.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
H. Peter Anvin
2008-02-04 16:48:00 +01:00
committed by Ingo Molnar
parent fa1408e4df
commit f0be6c6a69
3 changed files with 82 additions and 9 deletions
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26
arch/x86/boot/cpu.c
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@ -1,7 +1,7 @@
/* -*- linux-c -*- ------------------------------------------------------- *
*
* Copyright (C) 1991, 1992 Linus Torvalds
* Copyright 2007 rPath, Inc. - All Rights Reserved
* 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.
@ -9,7 +9,7 @@
* ----------------------------------------------------------------------- */
/*
* arch/i386/boot/cpu.c
* arch/x86/boot/cpu.c
*
* Check for obligatory CPU features and abort if the features are not
* present.
@ -19,6 +19,8 @@
#include "bitops.h"
#include <asm/cpufeature.h>
#include "cpustr.h"
static char *cpu_name(int level)
{
static char buf[6];
@ -35,6 +37,7 @@ 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);
@ -51,13 +54,26 @@ int validate_cpu(void)
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 (e & 1)
printf("%d:%d ", i, 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;
}
}