--- /dev/null
+/** @file\r
+*\r
+* Copyright (c) 2012-2014, ARM Limited. All rights reserved.\r
+*\r
+* This program and the accompanying materials\r
+* are licensed and made available under the terms and conditions of the BSD License\r
+* which accompanies this distribution. The full text of the license may be found at\r
+* http://opensource.org/licenses/bsd-license.php\r
+*\r
+* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
+* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+*\r
+**/\r
+\r
+#include <Library/IoLib.h>\r
+#include <Library/NorFlashPlatformLib.h>\r
+#include <Library/BaseMemoryLib.h>\r
+#include <Library/MemoryAllocationLib.h>\r
+\r
+#include <Protocol/SimpleFileSystem.h>\r
+\r
+#include "BootMonFsInternal.h"\r
+\r
+UINT32\r
+BootMonFsChecksum (\r
+ IN VOID *Data,\r
+ IN UINT32 Size\r
+ )\r
+{\r
+ UINT32 *Ptr;\r
+ UINT32 Word;\r
+ UINT32 Checksum;\r
+\r
+ ASSERT (Size % 4 == 0);\r
+\r
+ Checksum = 0;\r
+ Ptr = (UINT32*)Data;\r
+\r
+ while (Size > 0) {\r
+ Word = *Ptr++;\r
+ Size -= 4;\r
+\r
+ if (Word > ~Checksum) {\r
+ Checksum++;\r
+ }\r
+\r
+ Checksum += Word;\r
+ }\r
+\r
+ return ~Checksum;\r
+}\r
+\r
+EFI_STATUS\r
+BootMonFsComputeFooterChecksum (\r
+ IN OUT HW_IMAGE_DESCRIPTION *Footer\r
+ )\r
+{\r
+ HW_IMAGE_DESCRIPTION *Description;\r
+ UINT32 Index;\r
+\r
+ Footer->Attributes = 1;\r
+\r
+ Description = AllocateZeroPool (sizeof (HW_IMAGE_DESCRIPTION));\r
+ if (Description == NULL) {\r
+ DEBUG ((DEBUG_ERROR, "BootMonFsComputeFooterChecksum: Unable to allocate memory.\n"));\r
+ return EFI_OUT_OF_RESOURCES;\r
+ }\r
+\r
+ // Copy over to temporary shim\r
+ CopyMem (Description, Footer, sizeof (HW_IMAGE_DESCRIPTION));\r
+\r
+ // BootMon doesn't checksum the previous checksum\r
+ Description->FooterChecksum = 0;\r
+\r
+ // Blank out regions which aren't being used.\r
+ for (Index = Footer->RegionCount; Index < HW_IMAGE_DESCRIPTION_REGION_MAX; Index++) {\r
+ Description->Region[Index].Checksum = 0;\r
+ Description->Region[Index].LoadAddress = 0;\r
+ Description->Region[Index].Offset = 0;\r
+ Description->Region[Index].Size = 0;\r
+ }\r
+\r
+ // Compute the checksum\r
+ Footer->FooterChecksum = BootMonFsChecksum (Description, sizeof (HW_IMAGE_DESCRIPTION));\r
+\r
+ FreePool (Description);\r
+\r
+ return EFI_SUCCESS;\r
+}\r
+\r
+BOOLEAN\r
+BootMonFsImageInThisBlock (\r
+ IN VOID *Buf,\r
+ IN UINTN Size,\r
+ IN UINT32 Block,\r
+ OUT HW_IMAGE_DESCRIPTION *Image\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+ HW_IMAGE_FOOTER *Ptr;\r
+ HW_IMAGE_DESCRIPTION *Footer;\r
+ UINT32 Checksum;\r
+\r
+ // The footer is stored as the last thing in the block\r
+ Ptr = (HW_IMAGE_FOOTER *)((UINT8 *)Buf + Size - sizeof (HW_IMAGE_FOOTER));\r
+\r
+ // Check that the verification bytes are present\r
+ if ((Ptr->FooterSignature1 != HW_IMAGE_FOOTER_SIGNATURE_1) || (Ptr->FooterSignature2 != HW_IMAGE_FOOTER_SIGNATURE_2)) {\r
+ return FALSE;\r
+ }\r
+\r
+ if (Ptr->Version != HW_IMAGE_FOOTER_VERSION) {\r
+ return FALSE;\r
+ }\r
+\r
+ if (Ptr->Offset != HW_IMAGE_FOOTER_OFFSET) {\r
+ return FALSE;\r
+ }\r
+\r
+ Footer = (HW_IMAGE_DESCRIPTION *)(((UINT8 *)Buf + Size - sizeof (HW_IMAGE_DESCRIPTION)));\r
+ Checksum = Footer->FooterChecksum;\r
+ Status = BootMonFsComputeFooterChecksum (Footer);\r
+ if (EFI_ERROR (Status)) {\r
+ DEBUG ((DEBUG_ERROR, "Warning: failed to compute checksum for image '%a'\n", Footer->Footer.Filename));\r
+ }\r
+\r
+ if (Footer->FooterChecksum != Checksum) {\r
+ DEBUG ((DEBUG_ERROR, "Warning: image '%a' checksum mismatch.\n", Footer->Footer.Filename));\r
+ }\r
+\r
+ if ((Footer->BlockEnd != Block) || (Footer->BlockStart > Footer->BlockEnd)) {\r
+ return FALSE;\r
+ }\r
+\r
+ // Copy the image out\r
+ CopyMem (Image, Footer, sizeof (HW_IMAGE_DESCRIPTION));\r
+\r
+ return TRUE;\r
+}\r
+\r
+EFI_STATUS\r
+BootMonFsDiscoverNextImage (\r
+ IN BOOTMON_FS_INSTANCE *Instance,\r
+ IN EFI_LBA *LbaStart,\r
+ OUT HW_IMAGE_DESCRIPTION *Image\r
+ )\r
+{\r
+ EFI_BLOCK_IO_PROTOCOL *Blocks;\r
+ EFI_LBA CurrentLba;\r
+ VOID *Out;\r
+\r
+ Blocks = Instance->BlockIo;\r
+\r
+ // Allocate an output buffer\r
+ Out = AllocatePool (Instance->Media->BlockSize);\r
+ if (Out == NULL) {\r
+ return EFI_OUT_OF_RESOURCES;\r
+ }\r
+\r
+ Blocks->Reset (Blocks, FALSE);\r
+ CurrentLba = *LbaStart;\r
+\r
+ // Look for images in the rest of this block\r
+ while (CurrentLba <= Instance->Media->LastBlock) {\r
+ // Read in the next block\r
+ Blocks->ReadBlocks (Blocks, Instance->Media->MediaId, CurrentLba, Instance->Media->BlockSize, Out);\r
+ // Check for an image in the current block\r
+ if (BootMonFsImageInThisBlock (Out, Instance->Media->BlockSize, (CurrentLba - Instance->Media->LowestAlignedLba), Image)) {\r
+ DEBUG ((EFI_D_ERROR, "Found image: %a in block %d.\n", &(Image->Footer.Filename), (UINTN)(CurrentLba - Instance->Media->LowestAlignedLba)));\r
+ FreePool (Out);\r
+ *LbaStart = Image->BlockEnd + 1;\r
+ return EFI_SUCCESS;\r
+ } else {\r
+ CurrentLba++;\r
+ }\r
+ }\r
+\r
+ *LbaStart = CurrentLba;\r
+ FreePool (Out);\r
+ return EFI_NOT_FOUND;\r
+}\r
+\r
+EFI_STATUS\r
+BootMonFsInitialize (\r
+ IN BOOTMON_FS_INSTANCE *Instance\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+ EFI_LBA Lba;\r
+ UINT32 ImageCount;\r
+ BOOTMON_FS_FILE *NewFile;\r
+\r
+ ImageCount = 0;\r
+ Lba = 0;\r
+\r
+ while (1) {\r
+ Status = BootMonFsCreateFile (Instance, &NewFile);\r
+ if (EFI_ERROR (Status)) {\r
+ return Status;\r
+ }\r
+\r
+ Status = BootMonFsDiscoverNextImage (Instance, &Lba, &(NewFile->HwDescription));\r
+ if (EFI_ERROR (Status)) {\r
+ // Free NewFile allocated by BootMonFsCreateFile ()\r
+ FreePool (NewFile);\r
+ break;\r
+ }\r
+ InsertTailList (&Instance->RootFile->Link, &NewFile->Link);\r
+ ImageCount++;\r
+ }\r
+\r
+ Instance->Initialized = TRUE;\r
+ return EFI_SUCCESS;\r
+}\r
projects / mirror_edk2.git / blobdiff