usr/src/boot/sys/boot/efi/loader/copy.c

   1 /*-
   2  * Copyright (c) 2013 The FreeBSD Foundation
   3  * All rights reserved.
   4  *
   5  * This software was developed by Benno Rice under sponsorship from
   6  * the FreeBSD Foundation.
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include <sys/param.h>
  33
  34 #include <stand.h>
  35 #include <bootstrap.h>
  36
  37 #include <efi.h>
  38 #include <efilib.h>
  39
  40 #include "loader_efi.h"
  41
  42 #ifndef EFI_STAGING_SIZE
  43 #define EFI_STAGING_SIZE        48
  44 #endif
  45
  46 #define STAGE_PAGES     EFI_SIZE_TO_PAGES((EFI_STAGING_SIZE) * 1024 * 1024)
  47
  48 EFI_PHYSICAL_ADDRESS    staging, staging_end;
  49 int                     stage_offset_set = 0;
  50 ssize_t                 stage_offset;
  51
  52 int
  53 efi_copy_init(void)
  54 {
  55         EFI_STATUS      status;
  56
  57         status = BS->AllocatePages(AllocateAnyPages, EfiLoaderData,
  58             STAGE_PAGES, &staging);
  59         if (EFI_ERROR(status)) {
  60                 printf("failed to allocate staging area: %lu\n",
  61                     EFI_ERROR_CODE(status));
  62                 return (status);
  63         }
  64         staging_end = staging + STAGE_PAGES * EFI_PAGE_SIZE;
  65
  66 #if defined(__aarch64__) || defined(__arm__)
  67         /*
  68          * Round the kernel load address to a 2MiB value. This is needed
  69          * because the kernel builds a page table based on where it has
  70          * been loaded in physical address space. As the kernel will use
  71          * either a 1MiB or 2MiB page for this we need to make sure it
  72          * is correctly aligned for both cases.
  73          */
  74         staging = roundup2(staging, 2 * 1024 * 1024);
  75 #endif
  76
  77         return (0);
  78 }
  79
  80 void *
  81 efi_translate(vm_offset_t ptr)
  82 {
  83
  84         return ((void *)(ptr + stage_offset));
  85 }
  86
  87 ssize_t
  88 efi_copyin(const void *src, vm_offset_t dest, const size_t len)
  89 {
  90
  91         if (!stage_offset_set) {
  92                 stage_offset = (vm_offset_t)staging - dest;
  93                 stage_offset_set = 1;
  94         }
  95
  96         /* XXX: Callers do not check for failure. */
  97         if (dest + stage_offset + len > staging_end) {
  98                 errno = ENOMEM;
  99                 return (-1);
 100         }
 101         bcopy(src, (void *)(dest + stage_offset), len);
 102         return (len);
 103 }
 104
 105 ssize_t
 106 efi_copyout(const vm_offset_t src, void *dest, const size_t len)
 107 {
 108
 109         /* XXX: Callers do not check for failure. */
 110         if (src + stage_offset + len > staging_end) {
 111                 errno = ENOMEM;
 112                 return (-1);
 113         }
 114         bcopy((void *)(src + stage_offset), dest, len);
 115         return (len);
 116 }
 117
 118
 119 ssize_t
 120 efi_readin(const int fd, vm_offset_t dest, const size_t len)
 121 {
 122
 123         if (dest + stage_offset + len > staging_end) {
 124                 errno = ENOMEM;
 125                 return (-1);
 126         }
 127         return (read(fd, (void *)(dest + stage_offset), len));
 128 }
 129
 130 void
 131 efi_copy_finish(void)
 132 {
 133         uint64_t        *src, *dst, *last;
 134
 135         src = (uint64_t *)staging;
 136         dst = (uint64_t *)(staging - stage_offset);
 137         last = (uint64_t *)staging_end;
 138
 139         while (src < last)
 140                 *dst++ = *src++;
 141 }