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
main(void)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\nspeedstep-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 }
79