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| author | Olivier Martin <olivier.martin@arm.com> | 2014-01-16 00:06:13 +0000 |
|---|---|---|
| committer | oliviermartin <oliviermartin@6f19259b-4bc3-4df7-8a09-765794883524> | 2014-01-16 00:06:13 +0000 |
| commit | 94e0955d3e8a3d949e3f00fe69b2827a637058c3 (patch) | |
| tree | 79d2c08df59d10a4166bf4c384113682b3d3b905 /ArmPlatformPkg/FileSystem/BootMonFs/BootMonFsImages.c | |
| parent | 33fc8b0fec5fca4a8936348cba2b1beee0bc0ed5 (diff) | |
| download | edk2-platforms-94e0955d3e8a3d949e3f00fe69b2827a637058c3.tar.xz | |
ArmPlatformPkg/BootMonFs: Added support for the NorFlash File System of the ARM Development Boards
This is the filesystem created by the microcontroller on NOR Flash of the ARM Versatile
Express Development Board.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <olivier.martin@arm.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15126 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'ArmPlatformPkg/FileSystem/BootMonFs/BootMonFsImages.c')
| -rw-r--r-- | ArmPlatformPkg/FileSystem/BootMonFs/BootMonFsImages.c | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/ArmPlatformPkg/FileSystem/BootMonFs/BootMonFsImages.c b/ArmPlatformPkg/FileSystem/BootMonFs/BootMonFsImages.c new file mode 100644 index 0000000000..7d3e901903 --- /dev/null +++ b/ArmPlatformPkg/FileSystem/BootMonFs/BootMonFsImages.c @@ -0,0 +1,214 @@ +/** @file
+*
+* Copyright (c) 2012-2014, ARM Limited. All rights reserved.
+*
+* 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
+* http://opensource.org/licenses/bsd-license.php
+*
+* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+*
+**/
+
+#include <Library/IoLib.h>
+#include <Library/NorFlashPlatformLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/MemoryAllocationLib.h>
+
+#include <Protocol/SimpleFileSystem.h>
+
+#include "BootMonFsInternal.h"
+
+UINT32
+BootMonFsChecksum (
+ IN VOID *Data,
+ IN UINT32 Size
+ )
+{
+ UINT32 *Ptr;
+ UINT32 Word;
+ UINT32 Checksum;
+
+ ASSERT (Size % 4 == 0);
+
+ Checksum = 0;
+ Ptr = (UINT32*)Data;
+
+ while (Size > 0) {
+ Word = *Ptr++;
+ Size -= 4;
+
+ if (Word > ~Checksum) {
+ Checksum++;
+ }
+
+ Checksum += Word;
+ }
+
+ return ~Checksum;
+}
+
+EFI_STATUS
+BootMonFsComputeFooterChecksum (
+ IN OUT HW_IMAGE_DESCRIPTION *Footer
+ )
+{
+ HW_IMAGE_DESCRIPTION *Description;
+ UINT32 Index;
+
+ Footer->Attributes = 1;
+
+ Description = AllocateZeroPool (sizeof (HW_IMAGE_DESCRIPTION));
+ if (Description == NULL) {
+ DEBUG ((DEBUG_ERROR, "BootMonFsComputeFooterChecksum: Unable to allocate memory.\n"));
+ return EFI_OUT_OF_RESOURCES;
+ }
+
+ // Copy over to temporary shim
+ CopyMem (Description, Footer, sizeof (HW_IMAGE_DESCRIPTION));
+
+ // BootMon doesn't checksum the previous checksum
+ Description->FooterChecksum = 0;
+
+ // Blank out regions which aren't being used.
+ for (Index = Footer->RegionCount; Index < HW_IMAGE_DESCRIPTION_REGION_MAX; Index++) {
+ Description->Region[Index].Checksum = 0;
+ Description->Region[Index].LoadAddress = 0;
+ Description->Region[Index].Offset = 0;
+ Description->Region[Index].Size = 0;
+ }
+
+ // Compute the checksum
+ Footer->FooterChecksum = BootMonFsChecksum (Description, sizeof (HW_IMAGE_DESCRIPTION));
+
+ FreePool (Description);
+
+ return EFI_SUCCESS;
+}
+
+BOOLEAN
+BootMonFsImageInThisBlock (
+ IN VOID *Buf,
+ IN UINTN Size,
+ IN UINT32 Block,
+ OUT HW_IMAGE_DESCRIPTION *Image
+ )
+{
+ EFI_STATUS Status;
+ HW_IMAGE_FOOTER *Ptr;
+ HW_IMAGE_DESCRIPTION *Footer;
+ UINT32 Checksum;
+
+ // The footer is stored as the last thing in the block
+ Ptr = (HW_IMAGE_FOOTER *)((UINT8 *)Buf + Size - sizeof (HW_IMAGE_FOOTER));
+
+ // Check that the verification bytes are present
+ if ((Ptr->FooterSignature1 != HW_IMAGE_FOOTER_SIGNATURE_1) || (Ptr->FooterSignature2 != HW_IMAGE_FOOTER_SIGNATURE_2)) {
+ return FALSE;
+ }
+
+ if (Ptr->Version != HW_IMAGE_FOOTER_VERSION) {
+ return FALSE;
+ }
+
+ if (Ptr->Offset != HW_IMAGE_FOOTER_OFFSET) {
+ return FALSE;
+ }
+
+ Footer = (HW_IMAGE_DESCRIPTION *)(((UINT8 *)Buf + Size - sizeof (HW_IMAGE_DESCRIPTION)));
+ Checksum = Footer->FooterChecksum;
+ Status = BootMonFsComputeFooterChecksum (Footer);
+ if (EFI_ERROR (Status)) {
+ DEBUG ((DEBUG_ERROR, "Warning: failed to compute checksum for image '%a'\n", Footer->Footer.Filename));
+ }
+
+ if (Footer->FooterChecksum != Checksum) {
+ DEBUG ((DEBUG_ERROR, "Warning: image '%a' checksum mismatch.\n", Footer->Footer.Filename));
+ }
+
+ if ((Footer->BlockEnd != Block) || (Footer->BlockStart > Footer->BlockEnd)) {
+ return FALSE;
+ }
+
+ // Copy the image out
+ CopyMem (Image, Footer, sizeof (HW_IMAGE_DESCRIPTION));
+
+ return TRUE;
+}
+
+EFI_STATUS
+BootMonFsDiscoverNextImage (
+ IN BOOTMON_FS_INSTANCE *Instance,
+ IN EFI_LBA *LbaStart,
+ OUT HW_IMAGE_DESCRIPTION *Image
+ )
+{
+ EFI_BLOCK_IO_PROTOCOL *Blocks;
+ EFI_LBA CurrentLba;
+ VOID *Out;
+
+ Blocks = Instance->BlockIo;
+
+ // Allocate an output buffer
+ Out = AllocatePool (Instance->Media->BlockSize);
+ if (Out == NULL) {
+ return EFI_OUT_OF_RESOURCES;
+ }
+
+ Blocks->Reset (Blocks, FALSE);
+ CurrentLba = *LbaStart;
+
+ // Look for images in the rest of this block
+ while (CurrentLba <= Instance->Media->LastBlock) {
+ // Read in the next block
+ Blocks->ReadBlocks (Blocks, Instance->Media->MediaId, CurrentLba, Instance->Media->BlockSize, Out);
+ // Check for an image in the current block
+ if (BootMonFsImageInThisBlock (Out, Instance->Media->BlockSize, (CurrentLba - Instance->Media->LowestAlignedLba), Image)) {
+ DEBUG ((EFI_D_ERROR, "Found image: %a in block %d.\n", &(Image->Footer.Filename), (UINTN)(CurrentLba - Instance->Media->LowestAlignedLba)));
+ FreePool (Out);
+ *LbaStart = Image->BlockEnd + 1;
+ return EFI_SUCCESS;
+ } else {
+ CurrentLba++;
+ }
+ }
+
+ *LbaStart = CurrentLba;
+ FreePool (Out);
+ return EFI_NOT_FOUND;
+}
+
+EFI_STATUS
+BootMonFsInitialize (
+ IN BOOTMON_FS_INSTANCE *Instance
+ )
+{
+ EFI_STATUS Status;
+ EFI_LBA Lba;
+ UINT32 ImageCount;
+ BOOTMON_FS_FILE *NewFile;
+
+ ImageCount = 0;
+ Lba = 0;
+
+ while (1) {
+ Status = BootMonFsCreateFile (Instance, &NewFile);
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ Status = BootMonFsDiscoverNextImage (Instance, &Lba, &(NewFile->HwDescription));
+ if (EFI_ERROR (Status)) {
+ // Free NewFile allocated by BootMonFsCreateFile ()
+ FreePool (NewFile);
+ break;
+ }
+ InsertTailList (&Instance->RootFile->Link, &NewFile->Link);
+ ImageCount++;
+ }
+
+ Instance->Initialized = TRUE;
+ return EFI_SUCCESS;
+}
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