78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* (C) 2003 Bruno Ducrot
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* (C) 2004 Dominik Brodowski <linux@dominikbrodowski.de>
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*
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* Based on code found in
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* linux/include/asm-i386/ist.h and linux/arch/i386/kernel/setup.c
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* and originally developed by Andy Grover <andrew.grover@intel.com>
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*/
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#include <stdio.h>
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#include <string.h>
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#include <lrmi.h>
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int main (void)
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{
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struct LRMI_regs r;
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int retval;
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if (!LRMI_init())
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return 0;
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memset(&r, 0, sizeof(r));
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r.eax = 0x0000E980;
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r.edx = 0x47534943;
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retval = LRMI_int(0x15, &r);
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if (!retval) {
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printf("Failed!\n");
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return 0;
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}
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if (r.eax == 0x47534943) {
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printf("BIOS supports GSIC call:\n");
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printf("\tsignature: %c%c%c%c\n",
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(r.eax >> 24) & 0xff,
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(r.eax >> 16) & 0xff,
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(r.eax >> 8) & 0xff,
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(r.eax) & 0xff);
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printf("\tcommand port = 0x%.4x\n",
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r.ebx & 0xffff);
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printf("\tcommand = 0x%.4x\n",
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(r.ebx >> 16) & 0xffff);
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printf("\tevent port = 0x%.8x\n", r.ecx);
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printf("\tflags = 0x%.8x\n", r.edx);
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if (((r.ebx >> 16) & 0xffff) != 0x82) {
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printf("non-default command value. If speedstep-smi "
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"doesn't work out of the box,\nyou may want to "
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"try out the default value by passing "
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"smi_cmd=0x82 to the module\n ON YOUR OWN "
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"RISK.\n");
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}
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if ((r.ebx & 0xffff) != 0xb2) {
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printf("non-default command port. If speedstep-smi "
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"doesn't work out of the box,\nyou may want to "
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"try out the default value by passing "
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"smi_port=0x82 to the module\n ON YOUR OWN "
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"RISK.\n");
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}
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} else {
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printf("BIOS DOES NOT support GSIC call. Dumping registers anyway:\n");
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printf("eax = 0x%.8x\n", r.eax);
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printf("ebx = 0x%.8x\n", r.ebx);
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printf("ecx = 0x%.8x\n", r.ecx);
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printf("edx = 0x%.8x\n", r.edx);
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printf("Note also that some BIOS do not support the initial "
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"GSIC call, but the newer\nspeedstep-smi driver may "
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"work.\nFor this, you need to pass some arguments to "
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"the speedstep-smi driver:\n");
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printf("\tsmi_cmd=0x?? smi_port=0x?? smi_sig=1\n");
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printf("\nUnfortunately, you have to know what exactly are "
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"smi_cmd and smi_port, and this\nis system "
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"dependent.\n");
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}
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return 1;
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}
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