Merge branch 'auto-ftrace-next' into tracing/for-linus
[linux-2.6] / arch / x86 / boot / cpu.c
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 "bitops.h"
20 #include <asm/cpufeature.h>
21
22 #include "cpustr.h"
23
24 static char *cpu_name(int level)
25 {
26         static char buf[6];
27
28         if (level == 64) {
29                 return "x86-64";
30         } else {
31                 if (level == 15)
32                         level = 6;
33                 sprintf(buf, "i%d86", level);
34                 return buf;
35         }
36 }
37
38 int validate_cpu(void)
39 {
40         u32 *err_flags;
41         int cpu_level, req_level;
42         const unsigned char *msg_strs;
43
44         check_cpu(&cpu_level, &req_level, &err_flags);
45
46         if (cpu_level < req_level) {
47                 printf("This kernel requires an %s CPU, ",
48                        cpu_name(req_level));
49                 printf("but only detected an %s CPU.\n",
50                        cpu_name(cpu_level));
51                 return -1;
52         }
53
54         if (err_flags) {
55                 int i, j;
56                 puts("This kernel requires the following features "
57                      "not present on the CPU:\n");
58
59                 msg_strs = (const unsigned char *)x86_cap_strs;
60
61                 for (i = 0; i < NCAPINTS; i++) {
62                         u32 e = err_flags[i];
63
64                         for (j = 0; j < 32; j++) {
65                                 int n = (i << 5)+j;
66                                 if (*msg_strs < n) {
67                                         /* Skip to the next string */
68                                         do {
69                                                 msg_strs++;
70                                         } while (*msg_strs);
71                                         msg_strs++;
72                                 }
73                                 if (e & 1) {
74                                         if (*msg_strs == n && msg_strs[1])
75                                                 printf("%s ", msg_strs+1);
76                                         else
77                                                 printf("%d:%d ", i, j);
78                                 }
79                                 e >>= 1;
80                         }
81                 }
82                 putchar('\n');
83                 return -1;
84         } else {
85                 return 0;
86         }
87 }