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ArmPlatformPkg: Introduce ArmPlatformGlobalVariableLib

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This library hides where the 'XIP' Global Variable are located in the memory.
It is expected the Sec/PrePi modules define the Global Variable area through
the GlobalVariable HOB.

The ArmPlatformGlobalVariableLib library allows access to global variables by
their offsets in this region.




git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12420 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
oliviermartin
2011-09-22 23:11:03 +00:00
parent 5b1928ffd6
commit 8fc38a3f50
30 changed files with 739 additions and 49 deletions
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36
ArmPlatformPkg/PrePi/PrePi.c
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@@ -26,10 +26,17 @@
#include <Ppi/GuidedSectionExtraction.h>
#include <Guid/LzmaDecompress.h>
#include <Guid/ArmGlobalVariableHob.h>
#include "PrePi.h"
#include "LzmaDecompress.h"
#define IS_XIP() ((FixedPcdGet32 (PcdFdBaseAddress) > (FixedPcdGet32 (PcdSystemMemoryBase) + FixedPcdGet32 (PcdSystemMemorySize))) || \
((FixedPcdGet32 (PcdFdBaseAddress) + FixedPcdGet32 (PcdFdSize)) < FixedPcdGet32 (PcdSystemMemoryBase)))
// Not used when PrePi in run in XIP mode
UINTN mGlobalVariableBase = 0;
VOID
PrePiCommonExceptionEntry (
IN UINT32 Entry,
@@ -48,6 +55,23 @@ LzmaDecompressLibConstructor (
VOID
);
VOID
EFIAPI
BuildGlobalVariableHob (
IN EFI_PHYSICAL_ADDRESS GlobalVariableBase,
IN UINT32 GlobalVariableSize
)
{
ARM_HOB_GLOBAL_VARIABLE *Hob;
Hob = CreateHob (EFI_HOB_TYPE_GUID_EXTENSION, sizeof (ARM_HOB_GLOBAL_VARIABLE));
ASSERT(Hob != NULL);
CopyGuid (&(Hob->Header.Name), &gArmGlobalVariableGuid);
Hob->GlobalVariableBase = GlobalVariableBase;
Hob->GlobalVariableSize = GlobalVariableSize;
}
VOID
PrePiMain (
IN UINTN UefiMemoryBase,
@@ -62,6 +86,11 @@ PrePiMain (
UINTN CharCount;
UINTN StacksSize;
// If ensure the FD is either part of the System Memory or totally outside of the System Memory (XIP)
ASSERT (IS_XIP() ||
((FixedPcdGet32 (PcdFdBaseAddress) >= FixedPcdGet32 (PcdSystemMemoryBase)) &&
((FixedPcdGet32 (PcdFdBaseAddress) + FixedPcdGet32 (PcdFdSize)) <= (FixedPcdGet32 (PcdSystemMemoryBase) + FixedPcdGet32 (PcdSystemMemorySize)))));
// Enable program flow prediction, if supported.
ArmEnableBranchPrediction ();
@@ -77,6 +106,10 @@ PrePiMain (
// Initialize the Debug Agent for Source Level Debugging
InitializeDebugAgent (DEBUG_AGENT_INIT_POSTMEM_SEC, NULL, NULL);
SaveAndSetDebugTimerInterrupt (TRUE);
if (!IS_XIP()) {
mGlobalVariableBase = GlobalVariableBase;
}
// Declare the PI/UEFI memory region
HobList = HobConstructor (
@@ -95,6 +128,9 @@ PrePiMain (
StacksSize = PcdGet32 (PcdCPUCorePrimaryStackSize) + (FixedPcdGet32(PcdClusterCount) * 4 * FixedPcdGet32(PcdCPUCoreSecondaryStackSize));
BuildStackHob (StacksBase, StacksSize);
// Declare the Global Variable HOB
BuildGlobalVariableHob (GlobalVariableBase, FixedPcdGet32 (PcdPeiGlobalVariableSize));
// Set the Boot Mode
SetBootMode (ArmPlatformGetBootMode ());