cpupowerutils - cpufrequtils extended with quite some features
[linux-2.6.git] / tools / power / cpupower / debug / i386 / intel_gsic.c
1 /*
2  *  (C) 2003  Bruno Ducrot
3  *  (C) 2004  Dominik Brodowski <linux@dominikbrodowski.de>
4  *
5  *  Licensed under the terms of the GNU GPL License version 2.
6  *
7  * Based on code found in
8  * linux/include/asm-i386/ist.h and linux/arch/i386/kernel/setup.c
9  * and originally developed by Andy Grover <andrew.grover@intel.com>
10  */
11
12 #include <stdio.h>
13 #include <string.h>
14 #include <lrmi.h>
15
16 int main (void)
17 {
18         struct LRMI_regs        r;
19         int                     retval;
20
21         if (!LRMI_init())
22                 return 0;
23
24         memset(&r, 0, sizeof(r));
25
26         r.eax = 0x0000E980;
27         r.edx = 0x47534943;
28
29         retval = LRMI_int(0x15, &r);
30
31         if (!retval) {
32                 printf("Failed!\n");
33                 return 0;
34         }
35         if (r.eax == 0x47534943) {
36                 printf("BIOS supports GSIC call:\n");
37                 printf("\tsignature: %c%c%c%c\n",
38                        (r.eax >> 24) & 0xff,
39                        (r.eax >> 16) & 0xff,
40                        (r.eax >> 8) & 0xff,
41                        (r.eax) & 0xff);
42                 printf("\tcommand port = 0x%.4x\n",
43                        r.ebx & 0xffff);
44                 printf("\tcommand =      0x%.4x\n",
45                        (r.ebx >> 16) & 0xffff);
46                 printf("\tevent port =   0x%.8x\n", r.ecx);
47                 printf("\tflags =        0x%.8x\n", r.edx);
48                 if (((r.ebx >> 16) & 0xffff) != 0x82) {
49                         printf("non-default command value. If speedstep-smi "
50                                "doesn't work out of the box,\nyou may want to "
51                                "try out the default value by passing "
52                                "smi_cmd=0x82 to the module\n ON YOUR OWN "
53                                "RISK.\n");
54                 }
55                 if ((r.ebx & 0xffff) != 0xb2) {
56                         printf("non-default command port. If speedstep-smi "
57                                "doesn't work out of the box,\nyou may want to "
58                                "try out the default value by passing "
59                                "smi_port=0x82 to the module\n ON YOUR OWN "
60                                "RISK.\n");
61                 }
62         } else {
63                 printf("BIOS DOES NOT support GSIC call.  Dumping registers anyway:\n");
64                 printf("eax = 0x%.8x\n", r.eax);
65                 printf("ebx = 0x%.8x\n", r.ebx);
66                 printf("ecx = 0x%.8x\n", r.ecx);
67                 printf("edx = 0x%.8x\n", r.edx);
68                 printf("Note also that some BIOS do not support the initial "
69                        "GSIC call, but the newer\nspeeedstep-smi driver may "
70                        "work.\nFor this, you need to pass some arguments to "
71                        "the speedstep-smi driver:\n");
72                 printf("\tsmi_cmd=0x?? smi_port=0x?? smi_sig=1\n");
73                 printf("\nUnfortunately, you have to know what exactly are "
74                        "smi_cmd and smi_port, and this\nis system "
75                        "dependant.\n");
76         }
77         return 1;
78 }