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author | oliviermartin <oliviermartin@6f19259b-4bc3-4df7-8a09-765794883524> | 2011-09-22 23:05:20 +0000 |
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committer | oliviermartin <oliviermartin@6f19259b-4bc3-4df7-8a09-765794883524> | 2011-09-22 23:05:20 +0000 |
commit | 2dbcb8f0a3250395c0ea8436ac519b6908dc0ee7 (patch) | |
tree | fcc7592f5e22d5f0cc56be5339176545d885be52 /ArmPlatformPkg/PrePi/ModuleEntryPoint.S | |
parent | f156d5b49d3f1c3dd1a9dc3c9b6d94b02c056ad1 (diff) | |
download | edk2-platforms-2dbcb8f0a3250395c0ea8436ac519b6908dc0ee7.tar.xz |
ArmPlatformPkg: Changed memory model for the stacks
In the previous version, every cores had the same stack size.
To avoid to waste memory with secondary core stacks, the primary core stack
size is now different from the secondary cores stack size.
These are the Stack PCDs and their default values:
gArmPlatformTokenSpaceGuid.PcdCPUCoresSecStackBase|0
gArmPlatformTokenSpaceGuid.PcdCPUCoreSecPrimaryStackSize|0x10000
gArmPlatformTokenSpaceGuid.PcdCPUCoreSecSecondaryStackSize|0x1000
gArmPlatformTokenSpaceGuid.PcdCPUCoresSecMonStackBase|0
gArmPlatformTokenSpaceGuid.PcdCPUCoreSecMonStackSize|0x1000
gArmPlatformTokenSpaceGuid.PcdCPUCoresStackBase|0
gArmPlatformTokenSpaceGuid.PcdCPUCorePrimaryStackSize|0x10000
gArmPlatformTokenSpaceGuid.PcdCPUCoreSecondaryStackSize|0x1000
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12415 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'ArmPlatformPkg/PrePi/ModuleEntryPoint.S')
-rwxr-xr-x | ArmPlatformPkg/PrePi/ModuleEntryPoint.S | 99 |
1 files changed, 79 insertions, 20 deletions
diff --git a/ArmPlatformPkg/PrePi/ModuleEntryPoint.S b/ArmPlatformPkg/PrePi/ModuleEntryPoint.S index 4d64aa7e86..b5f2ee2e57 100755 --- a/ArmPlatformPkg/PrePi/ModuleEntryPoint.S +++ b/ArmPlatformPkg/PrePi/ModuleEntryPoint.S @@ -19,9 +19,9 @@ .text
.align 3
-# Global symbols referenced by this module
GCC_ASM_IMPORT(CEntryPoint)
GCC_ASM_IMPORT(ArmReadMpidr)
+GCC_ASM_IMPORT(ArmIsMPCore)
GCC_ASM_EXPORT(_ModuleEntryPoint)
StartupAddr: .word CEntryPoint
@@ -31,14 +31,14 @@ ASM_PFX(_ModuleEntryPoint): // Get ID of this CPU in Multicore system
bl ASM_PFX(ArmReadMpidr)
LoadConstantToReg (FixedPcdGet32(PcdArmPrimaryCoreMask), r1)
- and r0, r0, r1
+ and r5, r0, r1
_SetSVCMode:
// Enter SVC mode
mov r1, #0x13|0x80|0x40
msr CPSR_c, r1
-// Check if we can install the size at the top of the System Memory or if we need
+// Check if we can install the stack at the top of the System Memory or if we need
// to install the stacks at the bottom of the Firmware Device (case the FD is located
// at the top of the DRAM)
_SetupStackPosition:
@@ -60,35 +60,77 @@ _SetupStackPosition: //
// Calculate how much space there is between the top of the Firmware and the Top of the System Memory
- subs r5, r1, r3 // r5 = SystemMemoryTop - FdTop
- bmi _SetupStack // Jump if negative (FdTop > SystemMemoryTop)
- cmp r5, r4
+ subs r0, r1, r3 // r0 = SystemMemoryTop - FdTop
+ bmi _SetupStack // Jump if negative (FdTop > SystemMemoryTop). Case when the PrePi is in XIP memory outside of the DRAM
+ cmp r0, r4
bge _SetupStack
// Case the top of stacks is the FdBaseAddress
mov r1, r2
_SetupStack:
- // Compute Base of Normal stacks for CPU Cores
- LoadConstantToReg (FixedPcdGet32(PcdCPUCoresNonSecStackSize), r5)
- mul r3, r0, r5 // r3 = core_id * stack_size = offset from the stack base
- sub sp, r1, r3 // r3 = (SystemMemoryTop|FdBaseAddress) - StackOffset = TopOfStack
+ // r1 contains the top of the stack (and the UEFI Memory)
// Calculate the Base of the UEFI Memory
- sub r1, r1, r4
+ sub r6, r1, r4
- // Only allocate memory for global variables at top of the primary core stack
+_GetStackBase:
+ // Compute Base of Normal stacks for CPU Cores
+ // Is it MpCore system
+ bl ArmIsMPCore
cmp r0, #0
+ // Case it is not an MP Core system. Just setup the primary core
+ beq _SetupUnicoreStack
+
+_GetStackBaseMpCore:
+ // Stack for the primary core = PrimaryCoreStack
+ LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), r2)
+ sub r7, r1, r2
+ // Stack for the secondary core = Number of Cluster * (4 Core per cluster) * SecondaryStackSize
+ LoadConstantToReg (FixedPcdGet32(PcdClusterCount), r2)
+ lsl r2, r2, #2
+ LoadConstantToReg (FixedPcdGet32(PcdCPUCoreSecondaryStackSize), r3)
+ mul r2, r2, r3
+ sub r7, r7, r2
+
+ // The top of the Mpcore Stacks is in r1
+ // The base of the MpCore Stacks is in r7
+
+ // Is it the Primary Core ?
+ LoadConstantToReg (FixedPcdGet32(PcdArmPrimaryCore), r4)
+ cmp r0, r4
+ beq _SetupPrimaryCoreStack
+
+_SetupSecondaryCoreStack:
+ // Base of the stack for the secondary cores is in r7
+
+ // Get the position of the cores (ClusterId * 4) + CoreId
+ GetCorePositionInStack(r0, r5, r4)
+ // The stack starts at the top of the stack region. Add '1' to the Core Position to get the top of the stack
+ add r0, r0, #1
+ // Get the offset for the Secondary Stack
+ mul r0, r0, r3
+ add sp, r7, r0
+
bne _PrepareArguments
-_AllocateGlobalPrePiVariables:
- // Reserve top of the stack for Global PEI Variables (eg: PeiServicesTablePointer)
- LoadConstantToReg (FixedPcdGet32(PcdPeiGlobalVariableSize), r4)
- // The reserved place must be 8-bytes aligned for pushing 64-bit variable on the stack
- and r5, r4, #7
- rsb r5, r5, #8
- add r4, r4, r5
- sub sp, sp, r4
+_SetupPrimaryCoreStack:
+ // The top of the Mpcore Stacks is in r1
+ LoadConstantToReg (FixedPcdGet32(PcdPeiGlobalVariableSize), r2)
+
+ // The reserved space for global variable must be 8-bytes aligned for pushing
+ // 64-bit variable on the stack
+ SetPrimaryStack (r1, r2, r3)
+
+_SetGlobals:
+ // Set all the PrePi global variables to 0
+ mov r3, sp
+ mov r2, #0x0
+_InitGlobals:
+ str r2, [r3], #4
+ cmp r3, r1
+ blt _InitGlobals
+
_PrepareArguments:
// Move sec startup address into a data register
@@ -100,3 +142,20 @@ _PrepareArguments: // r1 = UefiMemoryBase
blx r2
+_NeverReturn:
+ b _NeverReturn
+
+_SetupUnicoreStack:
+ // The top of the Unicore Stack is in r1
+ LoadConstantToReg (FixedPcdGet32(PcdPeiGlobalVariableSize), r2)
+ LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), r3)
+
+ // Calculate the bottom of the primary stack (StackBase)
+ sub r7, r1, r3
+
+ // The reserved space for global variable must be 8-bytes aligned for pushing
+ // 64-bit variable on the stack
+ SetPrimaryStack (r1, r2, r3)
+
+ b _SetGlobals
+
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