/*-
 * Copyright (c) 2013 The FreeBSD Foundation
 * All rights reserved.
 *
 * This software was developed by Benno Rice 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.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: head/sys/boot/efi/loader/copy.c 293724 2016-01-12 02:17:39Z smh $");

#include <sys/param.h>

#include <stand.h>
#include <bootstrap.h>

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

#include "loader_efi.h"

#ifndef EFI_STAGING_SIZE
#define EFI_STAGING_SIZE        96
#endif

#define STAGE_PAGES     EFI_SIZE_TO_PAGES((EFI_STAGING_SIZE) * 1024 * 1024)

EFI_PHYSICAL_ADDRESS    staging, staging_end;
int                     stage_offset_set = 0;
ssize_t                 stage_offset;

int
efi_copy_init(void)
{
        EFI_STATUS      status;
        size_t          pages = STAGE_PAGES;

        status = BS->AllocatePages(AllocateAnyPages, EfiLoaderData,
            pages, &staging);
        if (EFI_ERROR(status)) {
                printf("failed to allocate %uMB staging area: %llu\n",
                    EFI_STAGING_SIZE, status);
                printf("retrying with smaller %uMB allocation\n",
                    EFI_STAGING_SIZE/2);
                pages /= 2;
                status = BS->AllocatePages(AllocateAnyPages, EfiLoaderData,
                    pages, &staging);
        }
        if (EFI_ERROR(status)) {
                printf("failed to allocate staging area: %llu\n",
                    status);
                return (status);
        }
        staging_end = staging + pages * EFI_PAGE_SIZE;

#if defined(__aarch64__)
        /*
         * Round the kernel load address to a 2MiB value. This is needed
         * because the kernel builds a page table based on where it has
         * been loaded in physical address space. As the kernel will use
         * either a 1MiB or 2MiB page for this we need to make sure it
         * is correctly aligned for both cases.
         */
        staging = roundup2(staging, 2 * 1024 * 1024);
#endif

        return (0);
}

void *
efi_translate(vm_offset_t ptr)
{

        return ((void *)(ptr + stage_offset));
}

ssize_t
efi_copyin(const void *src, vm_offset_t dest, const size_t len)
{

        if (!stage_offset_set) {
                stage_offset = (vm_offset_t)staging - dest;
                stage_offset_set = 1;
        }

        /* XXX: Callers do not check for failure. */
        if (dest + stage_offset + len > staging_end) {
                errno = ENOMEM;
                return (-1);
        }
        bcopy(src, (void *)(dest + stage_offset), len);
        return (len);
}

ssize_t
efi_copyout(const vm_offset_t src, void *dest, const size_t len)
{

        /* XXX: Callers do not check for failure. */
        if (src + stage_offset + len > staging_end) {
                errno = ENOMEM;
                return (-1);
        }
        bcopy((void *)(src + stage_offset), dest, len);
        return (len);
}


ssize_t
efi_readin(const int fd, vm_offset_t dest, const size_t len)
{

        if (dest + stage_offset + len > staging_end) {
                errno = ENOMEM;
                return (-1);
        }
        return (read(fd, (void *)(dest + stage_offset), len));
}

void
efi_copy_finish(void)
{
        uint64_t        *src, *dst, *last;

        src = (uint64_t *)staging;
        dst = (uint64_t *)(staging - stage_offset);
        last = (uint64_t *)staging_end;

        while (src < last)
                *dst++ = *src++;
}