1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /* -*- linux-c -*- ------------------------------------------------------- *
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Copyright (C) 1991, 1992 Linus Torvalds
5*4882a593Smuzhiyun * Copyright 2007-2008 rPath, Inc. - All Rights Reserved
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * ----------------------------------------------------------------------- */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun /*
10*4882a593Smuzhiyun * arch/x86/boot/cpu.c
11*4882a593Smuzhiyun *
12*4882a593Smuzhiyun * Check for obligatory CPU features and abort if the features are not
13*4882a593Smuzhiyun * present.
14*4882a593Smuzhiyun */
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #include "boot.h"
17*4882a593Smuzhiyun #ifdef CONFIG_X86_FEATURE_NAMES
18*4882a593Smuzhiyun #include "cpustr.h"
19*4882a593Smuzhiyun #endif
20*4882a593Smuzhiyun
cpu_name(int level)21*4882a593Smuzhiyun static char *cpu_name(int level)
22*4882a593Smuzhiyun {
23*4882a593Smuzhiyun static char buf[6];
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun if (level == 64) {
26*4882a593Smuzhiyun return "x86-64";
27*4882a593Smuzhiyun } else {
28*4882a593Smuzhiyun if (level == 15)
29*4882a593Smuzhiyun level = 6;
30*4882a593Smuzhiyun sprintf(buf, "i%d86", level);
31*4882a593Smuzhiyun return buf;
32*4882a593Smuzhiyun }
33*4882a593Smuzhiyun }
34*4882a593Smuzhiyun
show_cap_strs(u32 * err_flags)35*4882a593Smuzhiyun static void show_cap_strs(u32 *err_flags)
36*4882a593Smuzhiyun {
37*4882a593Smuzhiyun int i, j;
38*4882a593Smuzhiyun #ifdef CONFIG_X86_FEATURE_NAMES
39*4882a593Smuzhiyun const unsigned char *msg_strs = (const unsigned char *)x86_cap_strs;
40*4882a593Smuzhiyun for (i = 0; i < NCAPINTS; i++) {
41*4882a593Smuzhiyun u32 e = err_flags[i];
42*4882a593Smuzhiyun for (j = 0; j < 32; j++) {
43*4882a593Smuzhiyun if (msg_strs[0] < i ||
44*4882a593Smuzhiyun (msg_strs[0] == i && msg_strs[1] < j)) {
45*4882a593Smuzhiyun /* Skip to the next string */
46*4882a593Smuzhiyun msg_strs += 2;
47*4882a593Smuzhiyun while (*msg_strs++)
48*4882a593Smuzhiyun ;
49*4882a593Smuzhiyun }
50*4882a593Smuzhiyun if (e & 1) {
51*4882a593Smuzhiyun if (msg_strs[0] == i &&
52*4882a593Smuzhiyun msg_strs[1] == j &&
53*4882a593Smuzhiyun msg_strs[2])
54*4882a593Smuzhiyun printf("%s ", msg_strs+2);
55*4882a593Smuzhiyun else
56*4882a593Smuzhiyun printf("%d:%d ", i, j);
57*4882a593Smuzhiyun }
58*4882a593Smuzhiyun e >>= 1;
59*4882a593Smuzhiyun }
60*4882a593Smuzhiyun }
61*4882a593Smuzhiyun #else
62*4882a593Smuzhiyun for (i = 0; i < NCAPINTS; i++) {
63*4882a593Smuzhiyun u32 e = err_flags[i];
64*4882a593Smuzhiyun for (j = 0; j < 32; j++) {
65*4882a593Smuzhiyun if (e & 1)
66*4882a593Smuzhiyun printf("%d:%d ", i, j);
67*4882a593Smuzhiyun e >>= 1;
68*4882a593Smuzhiyun }
69*4882a593Smuzhiyun }
70*4882a593Smuzhiyun #endif
71*4882a593Smuzhiyun }
72*4882a593Smuzhiyun
validate_cpu(void)73*4882a593Smuzhiyun int validate_cpu(void)
74*4882a593Smuzhiyun {
75*4882a593Smuzhiyun u32 *err_flags;
76*4882a593Smuzhiyun int cpu_level, req_level;
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun check_cpu(&cpu_level, &req_level, &err_flags);
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun if (cpu_level < req_level) {
81*4882a593Smuzhiyun printf("This kernel requires an %s CPU, ",
82*4882a593Smuzhiyun cpu_name(req_level));
83*4882a593Smuzhiyun printf("but only detected an %s CPU.\n",
84*4882a593Smuzhiyun cpu_name(cpu_level));
85*4882a593Smuzhiyun return -1;
86*4882a593Smuzhiyun }
87*4882a593Smuzhiyun
88*4882a593Smuzhiyun if (err_flags) {
89*4882a593Smuzhiyun puts("This kernel requires the following features "
90*4882a593Smuzhiyun "not present on the CPU:\n");
91*4882a593Smuzhiyun show_cap_strs(err_flags);
92*4882a593Smuzhiyun putchar('\n');
93*4882a593Smuzhiyun return -1;
94*4882a593Smuzhiyun } else if (check_knl_erratum()) {
95*4882a593Smuzhiyun return -1;
96*4882a593Smuzhiyun } else {
97*4882a593Smuzhiyun return 0;
98*4882a593Smuzhiyun }
99*4882a593Smuzhiyun }
100