// SPDX-License-Identifier: GPL-2.0-only
/*
 *  (C) 2003  Bruno Ducrot
 *  (C) 2004  Dominik Brodowski <linux@dominikbrodowski.de>
 *
 * Based on code found in
 * linux/include/asm-i386/ist.h and linux/arch/i386/kernel/setup.c
 * and originally developed by Andy Grover <andrew.grover@intel.com>
 */

#include <stdio.h>
#include <string.h>
#include <lrmi.h>

int main (void)
{
        struct LRMI_regs        r;
        int                     retval;

        if (!LRMI_init())
                return 0;

        memset(&r, 0, sizeof(r));

        r.eax = 0x0000E980;
        r.edx = 0x47534943;

        retval = LRMI_int(0x15, &r);

        if (!retval) {
                printf("Failed!\n");
                return 0;
        }
        if (r.eax == 0x47534943) {
                printf("BIOS supports GSIC call:\n");
                printf("\tsignature: %c%c%c%c\n",
                       (r.eax >> 24) & 0xff,
                       (r.eax >> 16) & 0xff,
                       (r.eax >> 8) & 0xff,
                       (r.eax) & 0xff);
                printf("\tcommand port = 0x%.4x\n",
                       r.ebx & 0xffff);
                printf("\tcommand =      0x%.4x\n",
                       (r.ebx >> 16) & 0xffff);
                printf("\tevent port =   0x%.8x\n", r.ecx);
                printf("\tflags =        0x%.8x\n", r.edx);
                if (((r.ebx >> 16) & 0xffff) != 0x82) {
                        printf("non-default command value. If speedstep-smi "
                               "doesn't work out of the box,\nyou may want to "
                               "try out the default value by passing "
                               "smi_cmd=0x82 to the module\n ON YOUR OWN "
                               "RISK.\n");
                }
                if ((r.ebx & 0xffff) != 0xb2) {
                        printf("non-default command port. If speedstep-smi "
                               "doesn't work out of the box,\nyou may want to "
                               "try out the default value by passing "
                               "smi_port=0x82 to the module\n ON YOUR OWN "
                               "RISK.\n");
                }
        } else {
                printf("BIOS DOES NOT support GSIC call.  Dumping registers anyway:\n");
                printf("eax = 0x%.8x\n", r.eax);
                printf("ebx = 0x%.8x\n", r.ebx);
                printf("ecx = 0x%.8x\n", r.ecx);
                printf("edx = 0x%.8x\n", r.edx);
                printf("Note also that some BIOS do not support the initial "
                       "GSIC call, but the newer\nspeedstep-smi driver may "
                       "work.\nFor this, you need to pass some arguments to "
                       "the speedstep-smi driver:\n");
                printf("\tsmi_cmd=0x?? smi_port=0x?? smi_sig=1\n");
                printf("\nUnfortunately, you have to know what exactly are "
                       "smi_cmd and smi_port, and this\nis system "
                       "dependent.\n");
        }
        return 1;
}