1// SPDX-License-Identifier: GPL-2.0-only
 2/* -*- linux-c -*- ------------------------------------------------------- *
 3 *
 4 *   Copyright (C) 1991, 1992 Linus Torvalds
 5 *   Copyright 2007-2008 rPath, Inc. - All Rights Reserved
 6 *
 
 
 
 7 * ----------------------------------------------------------------------- */
 8
 9/*
10 * arch/x86/boot/cpu.c
11 *
12 * Check for obligatory CPU features and abort if the features are not
13 * present.
14 */
15
16#include "boot.h"
 
17#include "cpustr.h"
 
18
19static char *cpu_name(int level)
20{
21	static char buf[6];
22
23	if (level == 64) {
24		return "x86-64";
25	} else {
26		if (level == 15)
27			level = 6;
28		sprintf(buf, "i%d86", level);
29		return buf;
30	}
31}
32
33static void show_cap_strs(u32 *err_flags)
34{
35	int i, j;
 
36	const unsigned char *msg_strs = (const unsigned char *)x86_cap_strs;
37	for (i = 0; i < NCAPINTS; i++) {
38		u32 e = err_flags[i];
39		for (j = 0; j < 32; j++) {
40			if (msg_strs[0] < i ||
41			    (msg_strs[0] == i && msg_strs[1] < j)) {
42				/* Skip to the next string */
43				msg_strs += 2;
44				while (*msg_strs++)
45					;
46			}
47			if (e & 1) {
48				if (msg_strs[0] == i &&
49				    msg_strs[1] == j &&
50				    msg_strs[2])
51					printf("%s ", msg_strs+2);
52				else
53					printf("%d:%d ", i, j);
54			}
55			e >>= 1;
56		}
57	}
 
 
 
 
 
 
 
 
 
 
58}
59
60int validate_cpu(void)
61{
62	u32 *err_flags;
63	int cpu_level, req_level;
64
65	check_cpu(&cpu_level, &req_level, &err_flags);
66
67	if (cpu_level < req_level) {
68		printf("This kernel requires an %s CPU, ",
69		       cpu_name(req_level));
70		printf("but only detected an %s CPU.\n",
71		       cpu_name(cpu_level));
72		return -1;
73	}
74
75	if (err_flags) {
76		puts("This kernel requires the following features "
77		     "not present on the CPU:\n");
78		show_cap_strs(err_flags);
79		putchar('\n');
80		return -1;
81	} else if (check_knl_erratum()) {
82		return -1;
83	} else {
84		return 0;
85	}
86}

 
  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}