/*-
 * Copyright (c) 1998 Robert Nordier
 * All rights reserved.
 * Copyright (c) 2001 Robert Drehmel
 * All rights reserved.
 * Copyright (c) 2014 Nathan Whitehorn
 * All rights reserved.
 * Copyright (c) 2015 Eric McCorkle
 * All rights reverved.
 *
 * 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: head/sys/boot/efi/boot1/ufs_module.c 295320 2016-02-05 15:35:33Z smh $
 */

#include <stdarg.h>
#include <stdbool.h>
#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/disklabel64.h>
#include <sys/dtype.h>
#include <efi.h>

#include "boot_module.h"

static dev_info_t *devinfo;
static dev_info_t *devices;
static u_int64_t label_off;

static int
dskread(void *buf, u_int64_t lba, int nblk)
{
        int size;
        EFI_STATUS status;

        lba += label_off / DEV_BSIZE;   /* adjust for disklabel partition */
        lba = lba / (devinfo->dev->Media->BlockSize / DEV_BSIZE);
        size = nblk * DEV_BSIZE;

        status = devinfo->dev->ReadBlocks(devinfo->dev,
            devinfo->dev->Media->MediaId, lba, size, buf);

        if (status != EFI_SUCCESS) {
                DPRINTF("dskread: failed dev: %p, id: %u, lba: %lu, size: %d, "
                    "status: %llu\n", devinfo->dev,
                    devinfo->dev->Media->MediaId, lba, size,
                    status);
                return (-1);
        }

        return (0);
}

/* For ufsread.c */
uint64_t fs_off;
int ls;

static struct ufs_dmadat __dmadat;
static struct ufs_dmadat *boot2_dmadat;

#include "ufsread.c"

#define fsread boot2_ufs_read
#define fsread_size boot2_ufs_read_size
#define lookup boot2_ufs_lookup

static int
init_dev(dev_info_t* dev)
{
        devinfo = dev;
        boot2_dmadat = &__dmadat;
        struct disklabel64 *label;
        EFI_STATUS status;
        size_t label_size;

        label_size = (sizeof(*label) + 2047) & ~(size_t)2047;

        label_off = 0;
        status = BS->AllocatePool(EfiLoaderData, label_size, (void **)&label);
        if (status == EFI_SUCCESS) {
                if (dskread(label, 0, label_size / DEV_BSIZE) == 0 &&
                    label->d_magic == DISKMAGIC64 &&
                    label->d_npartitions > 0 &&
                    label->d_partitions[0].p_fstype == FS_BSDFFS) {
                        label_off = label->d_partitions[0].p_boffset;
                }
                BS->FreePool(label);
        }
        return fsread(0, NULL, 0);
}

static EFI_STATUS
probe(dev_info_t* dev)
{

        if (init_dev(dev) < 0)
                return (EFI_UNSUPPORTED);

        add_device(&devices, dev);

        return (EFI_SUCCESS);
}

static EFI_STATUS
load(const char *filepath, dev_info_t *dev, void **bufp, size_t *bufsize)
{
        ufs_ino_t ino;
        EFI_STATUS status;
        size_t size;
        ssize_t read;
        void *buf;

        DPRINTF("Loading '%s' from %s\n", filepath, devpath_str(dev->devpath));

        if (init_dev(dev) < 0) {
                DPRINTF("Failed to init device\n");
                return (EFI_UNSUPPORTED);
        }

        if ((ino = lookup(filepath)) == 0) {
                DPRINTF("Failed to lookup '%s' (file not found?)\n", filepath);
                return (EFI_NOT_FOUND);
        }

        if (fsread_size(ino, NULL, 0, &size) < 0 || size <= 0) {
                printf("Failed to read size of '%s' ino: %d\n", filepath, ino);
                return (EFI_INVALID_PARAMETER);
        }

        if ((status = BS->AllocatePool(EfiLoaderData, size, &buf)) !=
            EFI_SUCCESS) {
                printf("Failed to allocate read buffer %zu for '%s' (%llu)\n",
                    size, filepath, status);
                return (status);
        }

        read = fsread(ino, buf, size);
        if ((size_t)read != size) {
                printf("Failed to read '%s' (%zd != %zu)\n", filepath, read,
                    size);
                (void)BS->FreePool(buf);
                return (EFI_INVALID_PARAMETER);
        }

        DPRINTF("Load complete\n");

        *bufp = buf;
        *bufsize = size;

        return (EFI_SUCCESS);
}

static void
status(void)
{
        int i;
        dev_info_t *dev;

        for (dev = devices, i = 0; dev != NULL; dev = dev->next, i++)
                ;

        printf("%s found ", ufs_module.name);
        switch (i) {
        case 0:
                printf("no partitions\n");
                break;
        case 1:
                printf("%d partition\n", i);
                break;
        default:
                printf("%d partitions\n", i);
                break;
        }
}

static dev_info_t *
_devices(void)
{

        return (devices);
}

const boot_module_t ufs_module =
{
        .name = "UFS",
        .probe = probe,
        .load = load,
        .status = status,
        .devices = _devices
};