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
16int 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