efi/loader/copy.c

	copy.c revision 199767f8919635c4928607450d9e0abb932109ce
/*-
 * 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("$FreeBSD$");

#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    48
#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;

    status = BS->AllocatePages(AllocateAnyPages, EfiLoaderData,
        STAGE_PAGES, &staging);
    if (EFI_ERROR(status)) {
        printf("failed to allocate staging area: %lu\n",
            EFI_ERROR_CODE(status));
        return (status);
    }
    staging_end = staging + STAGE_PAGES * EFI_PAGE_SIZE;

#if defined(__aarch64__) || defined(__arm__)
    /*
     * 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++;
}