/*
 * Copyright (c) 2000 Doug Rabson
 * 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.
 */

#include <sys/cdefs.h>

#include <efi.h>
#include <efilib.h>

EFI_HANDLE              IH;
EFI_SYSTEM_TABLE        *ST;
EFI_BOOT_SERVICES       *BS;
EFI_RUNTIME_SERVICES    *RS;
EFI_LOADED_IMAGE_PROTOCOL *boot_img;

void *
efi_get_table(EFI_GUID *tbl)
{
        EFI_GUID *id;
        int i;

        for (i = 0; i < ST->NumberOfTableEntries; i++) {
                id = &ST->ConfigurationTable[i].VendorGuid;
                if (memcmp(id, tbl, sizeof (EFI_GUID)) == 0)
                        return (ST->ConfigurationTable[i].VendorTable);
        }
        return (NULL);
}

EFI_STATUS
OpenProtocolByHandle(EFI_HANDLE handle, EFI_GUID *protocol, void **interface)
{
        return (BS->OpenProtocol(handle, protocol, interface, IH, NULL,
            EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL));
}

/*
 * Allocate memory and query list of handles for indicated protocol.
 * Returns EFI status, list of handles and number of handles in list.
 * Caller needs to release the allocated memory.
 */
EFI_STATUS
efi_get_protocol_handles(EFI_GUID *protocolguid, uint_t *nhandles,
    EFI_HANDLE **handlep)
{
        UINTN bufsz = 0;
        EFI_STATUS status;
        EFI_HANDLE *handles;

        /*
         * get buffer size
         */
        *nhandles = 0;
        handles = NULL;
        status = BS->LocateHandle(ByProtocol, protocolguid,
            NULL, &bufsz, handles);
        if (status != EFI_BUFFER_TOO_SMALL)
                return (status);

        handles = malloc(bufsz);
        if (handles == NULL)
                return (errno_to_efi_status(ENOMEM));

        *nhandles = (uint_t)(bufsz / sizeof (EFI_HANDLE));
        /*
         * get handle array
         */
        status = BS->LocateHandle(ByProtocol, protocolguid,
            NULL, &bufsz, handles);
        if (EFI_ERROR(status)) {
                free(handles);
                *nhandles = 0;
        } else {
                *handlep = handles;
        }
        return (status);
}