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\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