HelenOS sources

root/boot/genarch/src/efi.c

DEFINITIONS

1. efi_vendor_table_find
2. efi_get_memory_map

/*
 * Copyright (c) 2011 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
 */

#include <genarch/efi.h>
#include <arch/types.h>
#include <stddef.h>

void *efi_vendor_table_find(efi_system_table_t *st, efi_guid_t guid)
{
        sysarg_t i;

        for (i = 0; i < st->conf_table_entries; i++)
                if ((st->conf_table[i].guid.low == guid.low) &&
                    (st->conf_table[i].guid.high == guid.high))
                        return st->conf_table[i].table;

        return NULL;
}

efi_status_t efi_get_memory_map(efi_system_table_t *st,
    sysarg_t *memory_map_size, efi_v1_memdesc_t **memory_map, sysarg_t *map_key,
    sysarg_t *descriptor_size, uint32_t *descriptor_version)
{
        efi_status_t status;

        *memory_map_size = 8 * sizeof(**memory_map);

        do {
                /* Allocate space for the memory map. */
                status = st->boot_services->allocate_pool(EFI_LOADER_DATA,
                    *memory_map_size, (void **) memory_map);
                if (status != EFI_SUCCESS)
                        return status;

                /* Try to obtain the map. */
                status = st->boot_services->get_memory_map(memory_map_size,
                    *memory_map, map_key, descriptor_size, descriptor_version);
                if (status == EFI_SUCCESS)
                        return status;

                /* An error occurred, release the allocated memory. */
                st->boot_services->free_pool(*memory_map);
        } while (status == EFI_BUFFER_TOO_SMALL);

        return status;
}