package/boot/grub2/applesetos.patch

   1 # --- T2-COPYRIGHT-NOTE-BEGIN ---
   2 # T2 SDE: package/*/grub2/applesetos.patch
   3 # Copyright (C) 2017 - 2024 The T2 SDE Project
   4 #
   5 # This Copyright note is generated by scripts/Create-CopyPatch,
   6 # more information can be found in the files COPYING and README.
   7 #
   8 # This patch file is dual-licensed. It is available under the license the
   9 # patched project is licensed under, as long as it is an OpenSource license
  10 # as defined at http://www.opensource.org/ (e.g. BSD, X11) or under the terms
  11 # of the GNU General Public License version 2 as used by the T2 SDE.
  12 # --- T2-COPYRIGHT-NOTE-END ---
  13
  14 The EFI on current macbooks configures hardware differently depending
  15 on wether it is booting Mac OS X or a different os, for example
  16 disabling the internal GPU completely on some models.
  17
  18 Mac OS X identifies itself using a custom EFI protocol.
  19
  20 This adds a command that fakes the os identification, making all
  21 hardware accessible.
  22
  23 ---
  24  grub-core/Makefile.core.def         |  6 +++
  25  grub-core/commands/efi/applesetos.c | 82 +++++++++++++++++++++++++++++++++++++
  26  2 files changed, 88 insertions(+)
  27  create mode 100644 grub-core/commands/efi/applesetos.c
  28
  29 diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
  30 index 42443bc..dc9c4de 100644
  31 --- a/grub-core/Makefile.core.def
  32 +++ b/grub-core/Makefile.core.def
  33 @@ -742,6 +742,12 @@ module = {
  34  };
  35
  36  module = {
  37 +  name = applesetos;
  38 +  common = commands/efi/applesetos.c;
  39 +  enable = efi;
  40 +};
  41 +
  42 +module = {
  43    name = blocklist;
  44    common = commands/blocklist.c;
  45  };
  46 diff --git a/grub-core/commands/efi/applesetos.c
  47 b/grub-core/commands/efi/applesetos.c
  48 new file mode 100644
  49 index 0000000..9464307
  50 --- /dev/null
  51 +++ b/grub-core/commands/efi/applesetos.c
  52 @@ -0,0 +1,82 @@
  53 +/* applesetos.c - Pretend to be Mac OS X. */
  54 +/*
  55 + *  GRUB  --  GRand Unified Bootloader
  56 + *  Copyright (C) 2013  Free Software Foundation, Inc.
  57 + *
  58 + *  GRUB is free software: you can redistribute it and/or modify
  59 + *  it under the terms of the GNU General Public License as published by
  60 + *  the Free Software Foundation, either version 3 of the License, or
  61 + *  (at your option) any later version.
  62 + *
  63 + *  GRUB is distributed in the hope that it will be useful,
  64 + *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  65 + *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  66 + *  GNU General Public License for more details.
  67 + *
  68 + *  You should have received a copy of the GNU General Public License
  69 + *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  70 + */
  71 +#include <grub/efi/api.h>
  72 +#include <grub/efi/efi.h>
  73 +#include <grub/command.h>
  74 +/* For NULL.  */
  75 +#include <grub/mm.h>
  76 +
  77 +GRUB_MOD_LICENSE ("GPLv3+");
  78 +
  79 +#define GRUB_EFI_APPLE_SET_OS_PROTOCOL_GUID  \
  80 +  { 0xc5c5da95, 0x7d5c, 0x45e6, \
  81 +    { 0xb2, 0xf1, 0x3f, 0xd5, 0x2b, 0xb1, 0x00, 0x77 } \
  82 +  }
  83 +
  84 +struct grub_efi_apple_set_os_interface
  85 +{
  86 +  grub_efi_uint64_t version;
  87 +  void (*set_os_version) (const grub_efi_char8_t *os_version);
  88 +  void (*set_os_vendor) (const grub_efi_char8_t *os_vendor);
  89 +};
  90 +typedef struct grub_efi_apple_set_os_interface grub_efi_apple_set_os_interface_t;
  91 +
  92 +static const grub_efi_char8_t apple_os_version[] = "macOS-ish";
  93 +static const grub_efi_char8_t apple_os_vendor[]  = "Apple Inc.";
  94 +
  95 +static grub_err_t
  96 +grub_cmd_apple_set_os (grub_command_t cmd __attribute__ ((unused)),
  97 +                       int argc __attribute__ ((unused)),
  98 +                       char **args __attribute__ ((unused)))
  99 +{
 100 +  grub_guid_t apple_set_os_guid = GRUB_EFI_APPLE_SET_OS_PROTOCOL_GUID;
 101 +  grub_efi_apple_set_os_interface_t *set_os;
 102 +  set_os = grub_efi_locate_protocol (&apple_set_os_guid, 0);
 103 +  if (!set_os) {
 104 +    return grub_error (GRUB_ERR_FILE_NOT_FOUND,
 105 +                       "Could not locate the apple set os protocol.");
 106 +  }
 107 +
 108 +  if (set_os->version != 0)
 109 +    {
 110 +      const grub_efi_char8_t* os_version = argc > 0 ? (const grub_efi_char8_t*)args[0] : apple_os_version;
 111 +      const grub_efi_char8_t* os_vendor = argc > 1 ? (const grub_efi_char8_t*)args[1] : apple_os_vendor;
 112 +
 113 +      set_os->set_os_version(os_version);
 114 +      grub_printf("Set os version to %s\n", os_version);
 115 +
 116 +      set_os->set_os_vendor(os_vendor);
 117 +      grub_printf("Set os vendor to %s\n", os_vendor);
 118 +    }
 119 +
 120 +  return 0;
 121 +}
 122 +
 123 +static grub_command_t cmd;
 124 +
 125 +GRUB_MOD_INIT(applesetos)
 126 +{
 127 +  cmd = grub_register_command ("apple_set_os", grub_cmd_apple_set_os, NULL,
 128 +                               "Register as Apple Inc. Mac OS X 10.9.");
 129 +}
 130 +
 131 +GRUB_MOD_FINI(applesetos)
 132 +{
 133 +  grub_unregister_command (cmd);
 134 +}
 135 --
 136 1.8.5.2
 137