Merge branch 'for-linus' of git://oss.sgi.com:8090/xfs/xfs-2.6
[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                 sprintf(buf, "i%d86", level);
32                 return buf;
33         }
34 }
35
36 int validate_cpu(void)
37 {
38         u32 *err_flags;
39         int cpu_level, req_level;
40         const unsigned char *msg_strs;
41
42         check_cpu(&cpu_level, &req_level, &err_flags);
43
44         if (cpu_level < req_level) {
45                 printf("This kernel requires an %s CPU, ",
46                        cpu_name(req_level));
47                 printf("but only detected an %s CPU.\n",
48                        cpu_name(cpu_level));
49                 return -1;
50         }
51
52         if (err_flags) {
53                 int i, j;
54                 puts("This kernel requires the following features "
55                      "not present on the CPU:\n");
56
57                 msg_strs = (const unsigned char *)x86_cap_strs;
58
59                 for (i = 0; i < NCAPINTS; i++) {
60                         u32 e = err_flags[i];
61
62                         for (j = 0; j < 32; j++) {
63                                 int n = (i << 5)+j;
64                                 if (*msg_strs < n) {
65                                         /* Skip to the next string */
66                                         do {
67                                                 msg_strs++;
68                                         } while (*msg_strs);
69                                         msg_strs++;
70                                 }
71                                 if (e & 1) {
72                                         if (*msg_strs == n && msg_strs[1])
73                                                 printf("%s ", msg_strs+1);
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 }