diff options
Diffstat (limited to 'MdePkg/Library/PeiHobLib/HobLib.c')
| -rw-r--r-- | MdePkg/Library/PeiHobLib/HobLib.c | 70 |
1 files changed, 69 insertions, 1 deletions
diff --git a/MdePkg/Library/PeiHobLib/HobLib.c b/MdePkg/Library/PeiHobLib/HobLib.c index f3ce93afc6..a1522dd9f5 100644 --- a/MdePkg/Library/PeiHobLib/HobLib.c +++ b/MdePkg/Library/PeiHobLib/HobLib.c @@ -1,7 +1,7 @@ /** @file
Provide Hob Library functions for Pei phase.
-Copyright (c) 2007 - 2014, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2007 - 2016, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
@@ -474,6 +474,62 @@ BuildGuidDataHob ( }
/**
+ Check FV alignment.
+
+ @param BaseAddress The base address of the Firmware Volume.
+ @param Length The size of the Firmware Volume in bytes.
+
+ @retval TRUE FvImage buffer is at its required alignment.
+ @retval FALSE FvImage buffer is not at its required alignment.
+
+**/
+BOOLEAN
+InternalCheckFvAlignment (
+ IN EFI_PHYSICAL_ADDRESS BaseAddress,
+ IN UINT64 Length
+ )
+{
+ EFI_FIRMWARE_VOLUME_HEADER *FwVolHeader;
+ UINT32 FvAlignment;
+
+ FvAlignment = 0;
+ FwVolHeader = (EFI_FIRMWARE_VOLUME_HEADER *) (UINTN) BaseAddress;
+
+ //
+ // If EFI_FVB2_WEAK_ALIGNMENT is set in the volume header then the first byte of the volume
+ // can be aligned on any power-of-two boundary. A weakly aligned volume can not be moved from
+ // its initial linked location and maintain its alignment.
+ //
+ if ((FwVolHeader->Attributes & EFI_FVB2_WEAK_ALIGNMENT) != EFI_FVB2_WEAK_ALIGNMENT) {
+ //
+ // Get FvHeader alignment
+ //
+ FvAlignment = 1 << ((FwVolHeader->Attributes & EFI_FVB2_ALIGNMENT) >> 16);
+ //
+ // FvAlignment must be greater than or equal to 8 bytes of the minimum FFS alignment value.
+ //
+ if (FvAlignment < 8) {
+ FvAlignment = 8;
+ }
+ if ((UINTN)BaseAddress % FvAlignment != 0) {
+ //
+ // FvImage buffer is not at its required alignment.
+ //
+ DEBUG ((
+ DEBUG_ERROR,
+ "Unaligned FvImage found at 0x%lx:0x%lx, the required alignment is 0x%x\n",
+ BaseAddress,
+ Length,
+ FvAlignment
+ ));
+ return FALSE;
+ }
+ }
+
+ return TRUE;
+}
+
+/**
Builds a Firmware Volume HOB.
This function builds a Firmware Volume HOB.
@@ -481,6 +537,7 @@ BuildGuidDataHob ( for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.
If there is no additional space for HOB creation, then ASSERT().
+ If the FvImage buffer is not at its required alignment, then ASSERT().
@param BaseAddress The base address of the Firmware Volume.
@param Length The size of the Firmware Volume in bytes.
@@ -495,6 +552,11 @@ BuildFvHob ( {
EFI_HOB_FIRMWARE_VOLUME *Hob;
+ if (!InternalCheckFvAlignment (BaseAddress, Length)) {
+ ASSERT (FALSE);
+ return;
+ }
+
Hob = InternalPeiCreateHob (EFI_HOB_TYPE_FV, (UINT16) sizeof (EFI_HOB_FIRMWARE_VOLUME));
if (Hob == NULL) {
return;
@@ -512,6 +574,7 @@ BuildFvHob ( for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.
If there is no additional space for HOB creation, then ASSERT().
+ If the FvImage buffer is not at its required alignment, then ASSERT().
@param BaseAddress The base address of the Firmware Volume.
@param Length The size of the Firmware Volume in bytes.
@@ -530,6 +593,11 @@ BuildFv2Hob ( {
EFI_HOB_FIRMWARE_VOLUME2 *Hob;
+ if (!InternalCheckFvAlignment (BaseAddress, Length)) {
+ ASSERT (FALSE);
+ return;
+ }
+
Hob = InternalPeiCreateHob (EFI_HOB_TYPE_FV2, (UINT16) sizeof (EFI_HOB_FIRMWARE_VOLUME2));
if (Hob == NULL) {
return;
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