197873a3dSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
296ae6ea0SThomas Gleixner /* -*- linux-c -*- ------------------------------------------------------- *
396ae6ea0SThomas Gleixner *
496ae6ea0SThomas Gleixner * Copyright (C) 1991, 1992 Linus Torvalds
5f0be6c6aSH. Peter Anvin * Copyright 2007-2008 rPath, Inc. - All Rights Reserved
696ae6ea0SThomas Gleixner *
796ae6ea0SThomas Gleixner * ----------------------------------------------------------------------- */
896ae6ea0SThomas Gleixner
996ae6ea0SThomas Gleixner /*
10f0be6c6aSH. Peter Anvin * arch/x86/boot/cpu.c
1196ae6ea0SThomas Gleixner *
1296ae6ea0SThomas Gleixner * Check for obligatory CPU features and abort if the features are not
1396ae6ea0SThomas Gleixner * present.
1496ae6ea0SThomas Gleixner */
1596ae6ea0SThomas Gleixner
1696ae6ea0SThomas Gleixner #include "boot.h"
17f0be6c6aSH. Peter Anvin #include "cpustr.h"
18f0be6c6aSH. Peter Anvin
cpu_name(int level)1996ae6ea0SThomas Gleixner static char *cpu_name(int level)
2096ae6ea0SThomas Gleixner {
2196ae6ea0SThomas Gleixner static char buf[6];
2296ae6ea0SThomas Gleixner
2396ae6ea0SThomas Gleixner if (level == 64) {
2496ae6ea0SThomas Gleixner return "x86-64";
2596ae6ea0SThomas Gleixner } else {
26c7d624d1SDave Jones if (level == 15)
27c7d624d1SDave Jones level = 6;
2896ae6ea0SThomas Gleixner sprintf(buf, "i%d86", level);
2996ae6ea0SThomas Gleixner return buf;
3096ae6ea0SThomas Gleixner }
3196ae6ea0SThomas Gleixner }
3296ae6ea0SThomas Gleixner
show_cap_strs(u32 * err_flags)339def39beSJosh Triplett static void show_cap_strs(u32 *err_flags)
3496ae6ea0SThomas Gleixner {
3596ae6ea0SThomas Gleixner int i, j;
369def39beSJosh Triplett const unsigned char *msg_strs = (const unsigned char *)x86_cap_strs;
3796ae6ea0SThomas Gleixner for (i = 0; i < NCAPINTS; i++) {
3896ae6ea0SThomas Gleixner u32 e = err_flags[i];
3996ae6ea0SThomas Gleixner for (j = 0; j < 32; j++) {
4097fc0555SH. Peter Anvin if (msg_strs[0] < i ||
4197fc0555SH. Peter Anvin (msg_strs[0] == i && msg_strs[1] < j)) {
42f0be6c6aSH. Peter Anvin /* Skip to the next string */
4397fc0555SH. Peter Anvin msg_strs += 2;
4497fc0555SH. Peter Anvin while (*msg_strs++)
4597fc0555SH. Peter Anvin ;
46f0be6c6aSH. Peter Anvin }
47f0be6c6aSH. Peter Anvin if (e & 1) {
4897fc0555SH. Peter Anvin if (msg_strs[0] == i &&
4997fc0555SH. Peter Anvin msg_strs[1] == j &&
5097fc0555SH. Peter Anvin msg_strs[2])
5197fc0555SH. Peter Anvin printf("%s ", msg_strs+2);
52f0be6c6aSH. Peter Anvin else
5396ae6ea0SThomas Gleixner printf("%d:%d ", i, j);
54f0be6c6aSH. Peter Anvin }
5596ae6ea0SThomas Gleixner e >>= 1;
5696ae6ea0SThomas Gleixner }
5796ae6ea0SThomas Gleixner }
589def39beSJosh Triplett }
599def39beSJosh Triplett
validate_cpu(void)609def39beSJosh Triplett int validate_cpu(void)
619def39beSJosh Triplett {
629def39beSJosh Triplett u32 *err_flags;
639def39beSJosh Triplett int cpu_level, req_level;
649def39beSJosh Triplett
659def39beSJosh Triplett check_cpu(&cpu_level, &req_level, &err_flags);
669def39beSJosh Triplett
679def39beSJosh Triplett if (cpu_level < req_level) {
689def39beSJosh Triplett printf("This kernel requires an %s CPU, ",
699def39beSJosh Triplett cpu_name(req_level));
709def39beSJosh Triplett printf("but only detected an %s CPU.\n",
719def39beSJosh Triplett cpu_name(cpu_level));
729def39beSJosh Triplett return -1;
739def39beSJosh Triplett }
749def39beSJosh Triplett
759def39beSJosh Triplett if (err_flags) {
769def39beSJosh Triplett puts("This kernel requires the following features "
779def39beSJosh Triplett "not present on the CPU:\n");
789def39beSJosh Triplett show_cap_strs(err_flags);
7996ae6ea0SThomas Gleixner putchar('\n');
8096ae6ea0SThomas Gleixner return -1;
81e4a84be6SDave Hansen } else if (check_knl_erratum()) {
82e4a84be6SDave Hansen return -1;
8396ae6ea0SThomas Gleixner } else {
8496ae6ea0SThomas Gleixner return 0;
8596ae6ea0SThomas Gleixner }
8696ae6ea0SThomas Gleixner }
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