| 1 | // SPDX-License-Identifier: GPL-2.0-only |
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| 2 | /* |
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| 3 | * (C) 2003 Bruno Ducrot |
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| 4 | * (C) 2004 Dominik Brodowski <linux@dominikbrodowski.de> |
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| 5 | * |
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| 6 | * Based on code found in |
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| 7 | * linux/include/asm-i386/ist.h and linux/arch/i386/kernel/setup.c |
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| 8 | * and originally developed by Andy Grover <andrew.grover@intel.com> |
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| 9 | */ |
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| 10 | |
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| 11 | #include <stdio.h> |
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| 12 | #include <string.h> |
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| 13 | #include <lrmi.h> |
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| 14 | |
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| 15 | int main (void) |
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| 16 | { |
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| 17 | struct LRMI_regs r; |
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| 18 | int retval; |
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| 19 | |
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| 20 | if (!LRMI_init()) |
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| 21 | return 0; |
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| 22 | |
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| 23 | memset(&r, 0, sizeof(r)); |
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| 24 | |
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| 25 | r.eax = 0x0000E980; |
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| 26 | r.edx = 0x47534943; |
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| 27 | |
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| 28 | retval = LRMI_int(0x15, &r); |
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| 29 | |
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| 30 | if (!retval) { |
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| 31 | printf("Failed!\n" ); |
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| 32 | return 0; |
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| 33 | } |
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| 34 | if (r.eax == 0x47534943) { |
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| 35 | printf("BIOS supports GSIC call:\n" ); |
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| 36 | printf("\tsignature: %c%c%c%c\n" , |
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| 37 | (r.eax >> 24) & 0xff, |
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| 38 | (r.eax >> 16) & 0xff, |
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| 39 | (r.eax >> 8) & 0xff, |
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| 40 | (r.eax) & 0xff); |
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| 41 | printf("\tcommand port = 0x%.4x\n" , |
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| 42 | r.ebx & 0xffff); |
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| 43 | printf("\tcommand = 0x%.4x\n" , |
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| 44 | (r.ebx >> 16) & 0xffff); |
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| 45 | printf("\tevent port = 0x%.8x\n" , r.ecx); |
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| 46 | printf("\tflags = 0x%.8x\n" , r.edx); |
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| 47 | if (((r.ebx >> 16) & 0xffff) != 0x82) { |
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| 48 | printf("non-default command value. If speedstep-smi " |
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| 49 | "doesn't work out of the box,\nyou may want to " |
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| 50 | "try out the default value by passing " |
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| 51 | "smi_cmd=0x82 to the module\n ON YOUR OWN " |
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| 52 | "RISK.\n" ); |
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| 53 | } |
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| 54 | if ((r.ebx & 0xffff) != 0xb2) { |
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| 55 | printf("non-default command port. If speedstep-smi " |
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| 56 | "doesn't work out of the box,\nyou may want to " |
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| 57 | "try out the default value by passing " |
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| 58 | "smi_port=0x82 to the module\n ON YOUR OWN " |
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| 59 | "RISK.\n" ); |
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| 60 | } |
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| 61 | } else { |
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| 62 | printf("BIOS DOES NOT support GSIC call. Dumping registers anyway:\n" ); |
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| 63 | printf("eax = 0x%.8x\n" , r.eax); |
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| 64 | printf("ebx = 0x%.8x\n" , r.ebx); |
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| 65 | printf("ecx = 0x%.8x\n" , r.ecx); |
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| 66 | printf("edx = 0x%.8x\n" , r.edx); |
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| 67 | printf("Note also that some BIOS do not support the initial " |
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| 68 | "GSIC call, but the newer\nspeedstep-smi driver may " |
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| 69 | "work.\nFor this, you need to pass some arguments to " |
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| 70 | "the speedstep-smi driver:\n" ); |
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| 71 | printf("\tsmi_cmd=0x?? smi_port=0x?? smi_sig=1\n" ); |
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| 72 | printf("\nUnfortunately, you have to know what exactly are " |
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| 73 | "smi_cmd and smi_port, and this\nis system " |
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| 74 | "dependent.\n" ); |
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| 75 | } |
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| 76 | return 1; |
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| 77 | } |
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| 78 | |
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