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ArmPkg: Introduce the PCD PcdDebuggerExceptionSupport 

The Exception Vector can be set before installing the CPU DXE driver to add
debugger support at the early stage of the firmware initialization.
If no one has touched the exception vector prior to the CPU DXE then the Vector
might contain non zero data.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11733 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
oliviermartin 2011-06-03 09:18:00 +00:00
parent 55fad96509
commit eeec69c5dc
3 changed files with 8 additions and 1 deletions
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3
ArmPkg/ArmPkg.dec
View File

@ -52,6 +52,9 @@
# point the Exception Vector Table to its location in CpuDxe.
# By default we copy the Vector Table at PcdGet32(PcdCpuVectorBaseAddress)
gArmTokenSpaceGuid.PcdRelocateVectorTable|TRUE|BOOLEAN|0x00000022
# Set this PCD to TRUE if the Exception Vector is changed to add debugger support before
# it has been configured by the CPU DXE
gArmTokenSpaceGuid.PcdDebuggerExceptionSupport|FALSE|BOOLEAN|0x00000032
gArmTokenSpaceGuid.PcdEfiUncachedMemoryToStronglyOrdered|FALSE|BOOLEAN|0x00000025
gArmTokenSpaceGuid.PcdSkipPeiCore|FALSE|BOOLEAN|0x00000026

1
ArmPkg/Drivers/CpuDxe/CpuDxe.inf
View File

@ -73,6 +73,7 @@
[FeaturePcd.common]
gArmTokenSpaceGuid.PcdCpuDxeProduceDebugSupport
gArmTokenSpaceGuid.PcdRelocateVectorTable
gArmTokenSpaceGuid.PcdDebuggerExceptionSupport
gArmTokenSpaceGuid.PcdEfiUncachedMemoryToStronglyOrdered
[depex]

5
ArmPkg/Drivers/CpuDxe/Exception.c
View File

@ -162,8 +162,10 @@ InitializeExceptions (
ASSERT_EFI_ERROR (Status);
}
if (FeaturePcdGet(PcdDebuggerExceptionSupport) == TRUE) {
// Save existing vector table, in case debugger is already hooked in
CopyMem ((VOID *)gDebuggerExceptionHandlers, (VOID *)VectorBase, sizeof (gDebuggerExceptionHandlers));
}
// Copy our assembly code into the page that contains the exception vectors.
CopyMem ((VOID *)VectorBase, (VOID *)ExceptionHandlersStart, Length);
@ -178,7 +180,8 @@ InitializeExceptions (
// Initialize the C entry points for interrupts
//
for (Index = 0; Index <= MAX_ARM_EXCEPTION; Index++) {
if ((gDebuggerExceptionHandlers[Index] == 0) || (gDebuggerExceptionHandlers[Index] == (VOID *)(UINTN)0xEAFFFFFE)) {
if (!FeaturePcdGet(PcdDebuggerExceptionSupport) ||
(gDebuggerExceptionHandlers[Index] == 0) || (gDebuggerExceptionHandlers[Index] == (VOID *)(UINTN)0xEAFFFFFE)) {
// Exception handler contains branch to vector location (jmp $) so no handler
// NOTE: This code assumes vectors are ARM and not Thumb code
Status = RegisterInterruptHandler (Index, NULL);