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ArmPlatformPkg/PrePeiCore: Reserve some memory on the top of the stack for Global Variables in XIP code

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The size of this memory is controlled by a PCD. The Global Variable in this regsion are defined by their offset.

This memory region can be use to store the PEI Services Table Pointer.
Update the PeiServicesTablePointerLib to use this region instead of PcdPeiServicePtrAddr.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11803 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
oliviermartin
2011-06-11 12:03:00 +00:00
parent 936eff09c3
commit 47a8e12fe1
10 changed files with 56 additions and 28 deletions
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24
ArmPlatformPkg/PrePeiCore/PrePeiCoreEntryPoint.asm
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@@ -33,15 +33,25 @@ _ModuleEntryPoint
_SetupStack
// Setup Stack for the 4 CPU cores
LoadConstantToReg (FixedPcdGet32(PcdCPUCoresNonSecStackBase) ,r1)
LoadConstantToReg (FixedPcdGet32(PcdCPUCoresNonSecStackSize) ,r2)
LoadConstantToReg (FixedPcdGet32(PcdCPUCoresNonSecStackBase), r1)
LoadConstantToReg (FixedPcdGet32(PcdCPUCoresNonSecStackSize), r2)
mov r3,r0 // r3 = core_id
mul r3,r3,r2 // r3 = core_id * stack_size = offset from the stack base
add r3,r3,r1 // r3 = stack_base + offset
add r3,r3,r2,LSR #1 // r3 = stack_offset + (stack_size/2) <-- the top half is for the heap
mov sp, r3
mov r3, r0 // r3 = core_id
mul r3, r3, r2 // r3 = core_id * stack_size = offset from the stack base
add r3, r3, r1 // r3 = stack_base + offset
add r3, r3, r2, LSR #1 // r3 = stack_offset + (stack_size/2) <-- the top half is for the heap
mov sp, r3
// Only allocate memory in top of the primary core stack
cmp r0, #0
bne _PrepareArguments
_AllocateGlobalPeiVariables
// Reserve top of the stack for Global PEI Variables (eg: PeiServicesTablePointer)
LoadConstantToReg (FixedPcdGet32(PcdPeiGlobalVariableSize), r1)
sub sp, sp, r1
_PrepareArguments
// The PEI Core Entry Point has been computed by GenFV and stored in the second entry of the Reset Vector
LoadConstantToReg (FixedPcdGet32(PcdNormalFdBaseAddress), r2)
add r2, r2, #4