FreeBSD/Linux Kernel Cross Reference
sys/dev/acpica/Osd/OsdTable.c

     /*-
      * Copyright (c) 2002 Mitsaru Iwasaki
      * All rights reserved.
      *
      * 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.
     */
    
    /*
     * ACPI Table interfaces
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/8.1/sys/dev/acpica/Osd/OsdTable.c 193530 2009-06-05 18:44:36Z jkim $");
    
    #include <sys/param.h>
    #include <sys/endian.h>
    #include <sys/kernel.h>
    #include <sys/linker.h>
    
    #include <contrib/dev/acpica/include/acpi.h>
    #include <contrib/dev/acpica/include/actables.h>
    
    #undef _COMPONENT
    #define _COMPONENT      ACPI_TABLES
    
    static char acpi_osname[128];
    TUNABLE_STR("hw.acpi.osname", acpi_osname, sizeof(acpi_osname));
    
    ACPI_STATUS
    AcpiOsPredefinedOverride(const ACPI_PREDEFINED_NAMES *InitVal,
        ACPI_STRING *NewVal)
    {
    
        if (InitVal == NULL || NewVal == NULL)
            return (AE_BAD_PARAMETER);
    
        *NewVal = NULL;
        if (strncmp(InitVal->Name, "_OS_", ACPI_NAME_SIZE) == 0 &&
            strlen(acpi_osname) > 0) {
            printf("ACPI: Overriding _OS definition with \"%s\"\n", acpi_osname);
            *NewVal = acpi_osname;
        }
    
        return (AE_OK);
    }
    
    ACPI_STATUS
    AcpiOsTableOverride(ACPI_TABLE_HEADER *ExistingTable,
        ACPI_TABLE_HEADER **NewTable)
    {
        char modname[] = "acpi_dsdt";
        caddr_t acpi_table, p, s;
    
        if (ExistingTable == NULL || NewTable == NULL)
            return (AE_BAD_PARAMETER);
    
    #ifdef notyet
        for (int i = 0; i < ACPI_NAME_SIZE; i++)
            modname[i + 5] = tolower(ExistingTable->Signature[i]);
    #else
        /* If we're not overriding the DSDT, just return. */
        if (strncmp(ExistingTable->Signature, ACPI_SIG_DSDT, ACPI_NAME_SIZE) != 0) {
            *NewTable = NULL;
            return (AE_OK);
        }
    #endif
    
        if ((acpi_table = preload_search_by_type(modname)) != NULL &&
            (p = preload_search_info(acpi_table, MODINFO_ADDR)) != NULL &&
            (s = preload_search_info(acpi_table, MODINFO_SIZE)) != NULL &&
            *(size_t *)s != 0)
            *NewTable = *(ACPI_TABLE_HEADER **)p;
        else
            *NewTable = NULL;
    
        return (AE_OK);
    }

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