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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * (C) 2003 Bruno Ducrot4 * (C) 2004 Dominik Brodowski <linux@dominikbrodowski.de>5 *6 * Based on code found in7 * linux/include/asm-i386/ist.h and linux/arch/i386/kernel/setup.c8 * and originally developed by Andy Grover <andrew.grover@intel.com>9 */10 11#include <stdio.h>12#include <string.h>13#include <lrmi.h>14 15int main (void)16{17 struct LRMI_regs r;18 int retval;19 20 if (!LRMI_init())21 return 0;22 23 memset(&r, 0, sizeof(r));24 25 r.eax = 0x0000E980;26 r.edx = 0x47534943;27 28 retval = LRMI_int(0x15, &r);29 30 if (!retval) {31 printf("Failed!\n");32 return 0;33 }34 if (r.eax == 0x47534943) {35 printf("BIOS supports GSIC call:\n");36 printf("\tsignature: %c%c%c%c\n",37 (r.eax >> 24) & 0xff,38 (r.eax >> 16) & 0xff,39 (r.eax >> 8) & 0xff,40 (r.eax) & 0xff);41 printf("\tcommand port = 0x%.4x\n",42 r.ebx & 0xffff);43 printf("\tcommand = 0x%.4x\n",44 (r.ebx >> 16) & 0xffff);45 printf("\tevent port = 0x%.8x\n", r.ecx);46 printf("\tflags = 0x%.8x\n", r.edx);47 if (((r.ebx >> 16) & 0xffff) != 0x82) {48 printf("non-default command value. If speedstep-smi "49 "doesn't work out of the box,\nyou may want to "50 "try out the default value by passing "51 "smi_cmd=0x82 to the module\n ON YOUR OWN "52 "RISK.\n");53 }54 if ((r.ebx & 0xffff) != 0xb2) {55 printf("non-default command port. If speedstep-smi "56 "doesn't work out of the box,\nyou may want to "57 "try out the default value by passing "58 "smi_port=0x82 to the module\n ON YOUR OWN "59 "RISK.\n");60 }61 } else {62 printf("BIOS DOES NOT support GSIC call. Dumping registers anyway:\n");63 printf("eax = 0x%.8x\n", r.eax);64 printf("ebx = 0x%.8x\n", r.ebx);65 printf("ecx = 0x%.8x\n", r.ecx);66 printf("edx = 0x%.8x\n", r.edx);67 printf("Note also that some BIOS do not support the initial "68 "GSIC call, but the newer\nspeedstep-smi driver may "69 "work.\nFor this, you need to pass some arguments to "70 "the speedstep-smi driver:\n");71 printf("\tsmi_cmd=0x?? smi_port=0x?? smi_sig=1\n");72 printf("\nUnfortunately, you have to know what exactly are "73 "smi_cmd and smi_port, and this\nis system "74 "dependent.\n");75 }76 return 1;77}78