1/* -*- linux-c -*- ------------------------------------------------------- *
 2 *
 3 *   Copyright (C) 1991, 1992 Linus Torvalds
 4 *   Copyright 2007-2008 rPath, Inc. - All Rights Reserved
 5 *
 6 *   This file is part of the Linux kernel, and is made available under
 7 *   the terms of the GNU General Public License version 2.
 8 *
 9 * ----------------------------------------------------------------------- */
10
11/*
12 * arch/x86/boot/cpu.c
13 *
14 * Check for obligatory CPU features and abort if the features are not
15 * present.
16 */
17
18#include "boot.h"
 
19#include "cpustr.h"
 
20
21static char *cpu_name(int level)
22{
23	static char buf[6];
24
25	if (level == 64) {
26		return "x86-64";
27	} else {
28		if (level == 15)
29			level = 6;
30		sprintf(buf, "i%d86", level);
31		return buf;
32	}
33}
34
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
35int validate_cpu(void)
36{
37	u32 *err_flags;
38	int cpu_level, req_level;
39	const unsigned char *msg_strs;
40
41	check_cpu(&cpu_level, &req_level, &err_flags);
42
43	if (cpu_level < req_level) {
44		printf("This kernel requires an %s CPU, ",
45		       cpu_name(req_level));
46		printf("but only detected an %s CPU.\n",
47		       cpu_name(cpu_level));
48		return -1;
49	}
50
51	if (err_flags) {
52		int i, j;
53		puts("This kernel requires the following features "
54		     "not present on the CPU:\n");
55
56		msg_strs = (const unsigned char *)x86_cap_strs;
57
58		for (i = 0; i < NCAPINTS; i++) {
59			u32 e = err_flags[i];
60
61			for (j = 0; j < 32; j++) {
62				if (msg_strs[0] < i ||
63				    (msg_strs[0] == i && msg_strs[1] < j)) {
64					/* Skip to the next string */
65					msg_strs += 2;
66					while (*msg_strs++)
67						;
68				}
69				if (e & 1) {
70					if (msg_strs[0] == i &&
71					    msg_strs[1] == j &&
72					    msg_strs[2])
73						printf("%s ", msg_strs+2);
74					else
75						printf("%d:%d ", i, j);
76				}
77				e >>= 1;
78			}
79		}
80		putchar('\n');
 
 
81		return -1;
82	} else {
83		return 0;
84	}
85}

  1/* -*- linux-c -*- ------------------------------------------------------- *
  2 *
  3 *   Copyright (C) 1991, 1992 Linus Torvalds
  4 *   Copyright 2007-2008 rPath, Inc. - All Rights Reserved
  5 *
  6 *   This file is part of the Linux kernel, and is made available under
  7 *   the terms of the GNU General Public License version 2.
  8 *
  9 * ----------------------------------------------------------------------- */
 10
 11/*
 12 * arch/x86/boot/cpu.c
 13 *
 14 * Check for obligatory CPU features and abort if the features are not
 15 * present.
 16 */
 17
 18#include "boot.h"
 19#ifdef CONFIG_X86_FEATURE_NAMES
 20#include "cpustr.h"
 21#endif
 22
 23static char *cpu_name(int level)
 24{
 25	static char buf[6];
 26
 27	if (level == 64) {
 28		return "x86-64";
 29	} else {
 30		if (level == 15)
 31			level = 6;
 32		sprintf(buf, "i%d86", level);
 33		return buf;
 34	}
 35}
 36
 37static void show_cap_strs(u32 *err_flags)
 38{
 39	int i, j;
 40#ifdef CONFIG_X86_FEATURE_NAMES
 41	const unsigned char *msg_strs = (const unsigned char *)x86_cap_strs;
 42	for (i = 0; i < NCAPINTS; i++) {
 43		u32 e = err_flags[i];
 44		for (j = 0; j < 32; j++) {
 45			if (msg_strs[0] < i ||
 46			    (msg_strs[0] == i && msg_strs[1] < j)) {
 47				/* Skip to the next string */
 48				msg_strs += 2;
 49				while (*msg_strs++)
 50					;
 51			}
 52			if (e & 1) {
 53				if (msg_strs[0] == i &&
 54				    msg_strs[1] == j &&
 55				    msg_strs[2])
 56					printf("%s ", msg_strs+2);
 57				else
 58					printf("%d:%d ", i, j);
 59			}
 60			e >>= 1;
 61		}
 62	}
 63#else
 64	for (i = 0; i < NCAPINTS; i++) {
 65		u32 e = err_flags[i];
 66		for (j = 0; j < 32; j++) {
 67			if (e & 1)
 68				printf("%d:%d ", i, j);
 69			e >>= 1;
 70		}
 71	}
 72#endif
 73}
 74
 75int validate_cpu(void)
 76{
 77	u32 *err_flags;
 78	int cpu_level, req_level;
 
 79
 80	check_cpu(&cpu_level, &req_level, &err_flags);
 81
 82	if (cpu_level < req_level) {
 83		printf("This kernel requires an %s CPU, ",
 84		       cpu_name(req_level));
 85		printf("but only detected an %s CPU.\n",
 86		       cpu_name(cpu_level));
 87		return -1;
 88	}
 89
 90	if (err_flags) {
 
 91		puts("This kernel requires the following features "
 92		     "not present on the CPU:\n");
 93		show_cap_strs(err_flags);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 94		putchar('\n');
 95		return -1;
 96	} else if (check_knl_erratum()) {
 97		return -1;
 98	} else {
 99		return 0;
100	}
101}