FreeBSD/Linux Kernel Cross Reference
sys/compat/linuxkpi/common/src/linux_dmi.c

     /*-
      * Copyright (c) 2020 The FreeBSD Foundation
      *
      * This software was developed by Emmanuel Vadot under sponsorship
      * from the FreeBSD Foundation.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    
    #include <linux/dmi.h>
    
    static char *dmi_data[DMI_STRING_MAX];
    
    static void
    linux_dmi_preload(void *arg)
    {
    
            dmi_data[DMI_BIOS_VENDOR] = kern_getenv("smbios.bios.vendor");
            dmi_data[DMI_BIOS_VERSION] = kern_getenv("smbios.bios.version");
            dmi_data[DMI_BIOS_DATE] = kern_getenv("smbios.bios.reldate");
            dmi_data[DMI_SYS_VENDOR] = kern_getenv("smbios.system.maker");
            dmi_data[DMI_PRODUCT_NAME] = kern_getenv("smbios.system.product");
            dmi_data[DMI_PRODUCT_VERSION] = kern_getenv("smbios.system.version");
            dmi_data[DMI_PRODUCT_SERIAL] = kern_getenv("smbios.system.serial");
            dmi_data[DMI_PRODUCT_UUID] = kern_getenv("smbios.system.uuid");
            dmi_data[DMI_BOARD_VENDOR] = kern_getenv("smbios.planar.maker");
            dmi_data[DMI_BOARD_NAME] = kern_getenv("smbios.planar.product");
            dmi_data[DMI_BOARD_VERSION] = kern_getenv("smbios.planar.version");
            dmi_data[DMI_BOARD_SERIAL] = kern_getenv("smbios.planar.serial");
            dmi_data[DMI_BOARD_ASSET_TAG] = kern_getenv("smbios.planar.tag");
            dmi_data[DMI_CHASSIS_VENDOR] = kern_getenv("smbios.chassis.maker");
            dmi_data[DMI_CHASSIS_TYPE] = kern_getenv("smbios.chassis.type");
            dmi_data[DMI_CHASSIS_VERSION] = kern_getenv("smbios.chassis.version");
            dmi_data[DMI_CHASSIS_SERIAL] = kern_getenv("smbios.chassis.serial");
            dmi_data[DMI_CHASSIS_ASSET_TAG] = kern_getenv("smbios.chassis.tag");
    }
    SYSINIT(linux_dmi_preload, SI_SUB_DRIVERS, SI_ORDER_ANY, linux_dmi_preload, NULL);
    
    /* Match a system against a field */
    bool
    linux_dmi_match(enum dmi_field f, const char *str)
    {
    
            if (f < DMI_STRING_MAX &&
                dmi_data[f] != NULL &&
                strcmp(dmi_data[f], str) == 0)
                    return(true);
            return (false);
    }
    
    /* Match a system against the struct, all matches must be ok */
    static bool
    linux_dmi_matches(const struct dmi_system_id *dsi)
    {
            enum dmi_field slot;
            int i;
    
            for (i = 0; i < nitems(dsi->matches); i++) {
                    slot = dsi->matches[i].slot;
                    if (slot == DMI_NONE)
                            break;
                    if (slot >= DMI_STRING_MAX ||
                        dmi_data[slot] == NULL)
                            return (false);
                    if (dsi->matches[i].exact_match) {
                            if (dmi_match(slot, dsi->matches[i].substr))
                                    continue;
                    } else if (strstr(dmi_data[slot],
                            dsi->matches[i].substr) != NULL) {
                            continue;
                    }
                    return (false);
            }
            return (true);
   }
   
   /* Return the string matching the field */
   const char *
   linux_dmi_get_system_info(int field)
   {
   
           if (field < DMI_STRING_MAX)
                   return (dmi_data[field]);
           return (NULL);
   }
   
   /* 
    * Match a system against the structs list
    * If a match is found return the corresponding structure.
    */
   const struct dmi_system_id *
   linux_dmi_first_match(const struct dmi_system_id *list)
   {
           const struct dmi_system_id *dsi;
   
           for (dsi = list; dsi->matches[0].slot != 0; dsi++) {
                   if (linux_dmi_matches(dsi))
                           return (dsi);
           }
   
           return (NULL);
   }
   
   /*
    * Match a system against the structs list
    * For each match call the callback with the corresponding data
    * Return the number of matches.
    */
   int
   linux_dmi_check_system(const struct dmi_system_id *sysid)
   {
           const struct dmi_system_id *dsi;
           int matches = 0;
   
           for (dsi = sysid; dsi->matches[0].slot != 0; dsi++) {
                   if (linux_dmi_matches(dsi)) {
                           matches++;
                           if (dsi->callback && dsi->callback(dsi))
                                   break;
                   }
           }
   
           return (matches);
   }

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