code.delx.au - refind/blob - refind/apple.c

   1 /*
   2  * refind/apple.c
   3  * Functions specific to Apple computers
   4  *
   5  * Copyright (c) 2015 Roderick W. Smith
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation, either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 #include "global.h"
  23 #include "config.h"
  24 #include "lib.h"
  25 #include "screen.h"
  26 #include "apple.h"
  27 #include "mystrings.h"
  28 #include "refit_call_wrapper.h"
  29
  30 CHAR16 gCsrStatus[256];
  31
  32 // Get CSR (Apple's System Integrity Protection [SIP], or "rootless") status
  33 // information.
  34 EFI_STATUS GetCsrStatus(UINT32 *CsrStatus) {
  35     UINT32     *ReturnValue = NULL;
  36     UINTN      CsrLength;
  37     EFI_GUID   CsrGuid = CSR_GUID;
  38     EFI_STATUS Status = EFI_INVALID_PARAMETER;
  39
  40     if (CsrStatus) {
  41         Status = EfivarGetRaw(&CsrGuid, L"csr-active-config", (CHAR8**) &ReturnValue, &CsrLength);
  42         if (Status == EFI_SUCCESS) {
  43             if (CsrLength == 4) {
  44                 *CsrStatus = *ReturnValue;
  45             } else {
  46                 Status = EFI_BAD_BUFFER_SIZE;
  47                 SPrint(gCsrStatus, 255, L" Unknown System Integrity Protection version");
  48             }
  49             MyFreePool(ReturnValue);
  50         } // if (Status == EFI_SUCCESS)
  51     } // if (CsrStatus)
  52     return Status;
  53 } // INTN GetCsrStatus()
  54
  55 // Store string describing CSR status value in gCsrStatus variable, which appears
  56 // on the Info page. If DisplayMessage is TRUE, displays the new value of
  57 // gCsrStatus on the screen for three seconds.
  58 VOID RecordgCsrStatus(UINT32 CsrStatus, BOOLEAN DisplayMessage) {
  59     EG_PIXEL    BGColor;
  60
  61     BGColor.b = 255;
  62     BGColor.g = 175;
  63     BGColor.r = 100;
  64     BGColor.a = 0;
  65
  66     switch (CsrStatus) {
  67         case SIP_ENABLED:
  68             SPrint(gCsrStatus, 255, L" System Integrity Protection is enabled (0x%02x)", CsrStatus);
  69             break;
  70         case SIP_DISABLED:
  71             SPrint(gCsrStatus, 255, L" System Integrity Protection is disabled (0x%02x)", CsrStatus);
  72             break;
  73         default:
  74             SPrint(gCsrStatus, 255, L" System Integrity Protection status: 0x%02x", CsrStatus);
  75     } // switch
  76     if (DisplayMessage) {
  77         egDisplayMessage(gCsrStatus, &BGColor);
  78         PauseSeconds(3);
  79     } // if
  80 } // VOID RecordgCsrStatus
  81
  82 // Find the current CSR status and reset it to the next one in the
  83 // GlobalConfig.CsrValues list, or to the first value if the current
  84 // value is not on the list.
  85 VOID RotateCsrValue(VOID) {
  86     UINT32       CurrentValue, TargetCsr;
  87     UINT32_LIST  *ListItem;
  88     EFI_GUID     CsrGuid = CSR_GUID;
  89     EFI_STATUS   Status;
  90
  91     Status = GetCsrStatus(&CurrentValue);
  92     if ((Status == EFI_SUCCESS) && GlobalConfig.CsrValues) {
  93         ListItem = GlobalConfig.CsrValues;
  94         while ((ListItem != NULL) && (ListItem->Value != CurrentValue))
  95             ListItem = ListItem->Next;
  96         if (ListItem == NULL || ListItem->Next == NULL) {
  97             TargetCsr = GlobalConfig.CsrValues->Value;
  98         } else {
  99             TargetCsr = ListItem->Next->Value;
 100         }
 101         Status = EfivarSetRaw(&CsrGuid, L"csr-active-config", (CHAR8 *) &TargetCsr, 4, TRUE);
 102         if (Status == EFI_SUCCESS)
 103             RecordgCsrStatus(TargetCsr, TRUE);
 104         else
 105             SPrint(gCsrStatus, 255, L" Error setting System Integrity Protection code.");
 106     } // if
 107 } // VOID RotateCsrValue()
 108
 109
 110 /*
 111  * The below definitions and SetAppleOSInfo() function are based on a GRUB patch
 112  * by Andreas Heider:
 113  * https://lists.gnu.org/archive/html/grub-devel/2013-12/msg00442.html
 114  */
 115
 116 #define EFI_APPLE_SET_OS_PROTOCOL_GUID  \
 117   { 0xc5c5da95, 0x7d5c, 0x45e6, \
 118     { 0xb2, 0xf1, 0x3f, 0xd5, 0x2b, 0xb1, 0x00, 0x77 } \
 119   }
 120
 121 typedef struct EfiAppleSetOsInterface {
 122     UINT64 Version;
 123     EFI_STATUS EFIAPI (*SetOsVersion) (IN CHAR8 *Version);
 124     EFI_STATUS EFIAPI (*SetOsVendor) (IN CHAR8 *Vendor);
 125 } EfiAppleSetOsInterface;
 126
 127 // Function to tell the firmware that OS X is being launched. This is
 128 // required to work around problems on some Macs that don't fully
 129 // initialize some hardware (especially video displays) when third-party
 130 // OSes are launched in EFI mode.
 131 EFI_STATUS SetAppleOSInfo() {
 132     CHAR16 *AppleOSVersion = NULL;
 133     CHAR8 *AppleOSVersion8 = NULL;
 134     EFI_STATUS Status;
 135     EFI_GUID apple_set_os_guid = EFI_APPLE_SET_OS_PROTOCOL_GUID;
 136     EfiAppleSetOsInterface *SetOs = NULL;
 137
 138     Status = refit_call3_wrapper(BS->LocateProtocol, &apple_set_os_guid, NULL, (VOID**) &SetOs);
 139
 140     // If not a Mac, ignore the call....
 141     if ((Status != EFI_SUCCESS) || (!SetOs))
 142         return EFI_SUCCESS;
 143
 144     if ((SetOs->Version != 0) && GlobalConfig.SpoofOSXVersion) {
 145         AppleOSVersion = StrDuplicate(L"Mac OS X");
 146         MergeStrings(&AppleOSVersion, GlobalConfig.SpoofOSXVersion, ' ');
 147         if (AppleOSVersion) {
 148             AppleOSVersion8 = AllocateZeroPool((StrLen(AppleOSVersion) + 1) * sizeof(CHAR8));
 149             UnicodeStrToAsciiStr(AppleOSVersion, AppleOSVersion8);
 150             if (AppleOSVersion8) {
 151                 Status = refit_call1_wrapper (SetOs->SetOsVersion, AppleOSVersion8);
 152                 if (!EFI_ERROR(Status))
 153                     Status = EFI_SUCCESS;
 154                 MyFreePool(AppleOSVersion8);
 155             } else {
 156                 Status = EFI_OUT_OF_RESOURCES;
 157                 Print(L"Out of resources in SetAppleOSInfo!\n");
 158             }
 159             if ((Status == EFI_SUCCESS) && (SetOs->Version == 2))
 160                 Status = refit_call1_wrapper (SetOs->SetOsVendor, "Apple Inc.");
 161             MyFreePool(AppleOSVersion);
 162         } // if (AppleOSVersion)
 163     } // if
 164     if (Status != EFI_SUCCESS)
 165         Print(L"Unable to set firmware boot type!\n");
 166
 167     return (Status);
 168 } // EFI_STATUS SetAppleOSInfo()