//\r
-// Copyright (c) 2011, ARM Limited. All rights reserved.\r
+// Copyright (c) 2011-2012, ARM Limited. All rights reserved.\r
//\r
// This program and the accompanying materials\r
// are licensed and made available under the terms and conditions of the BSD License\r
INCLUDE AsmMacroIoLib.inc\r
\r
IMPORT CEntryPoint\r
+ IMPORT ArmReadMpidr\r
+ IMPORT ArmIsMpCore\r
EXPORT _ModuleEntryPoint\r
\r
PRESERVE8\r
StartupAddr DCD CEntryPoint\r
\r
_ModuleEntryPoint\r
- // Identify CPU ID\r
- mrc p15, 0, r0, c0, c0, 5\r
- and r0, #0xf\r
+ // Get ID of this CPU in Multicore system\r
+ bl ArmReadMpidr\r
+ LoadConstantToReg (FixedPcdGet32(PcdArmPrimaryCoreMask), r1)\r
+ and r5, r0, r1\r
\r
-_UefiMemoryBase\r
-#if FixedPcdGet32(PcdStandalone)\r
+_SetSVCMode\r
+ // Enter SVC mode, Disable FIQ and IRQ\r
+ mov r1, #0x13|0x80|0x40\r
+ msr CPSR_c, r1\r
+\r
+// Check if we can install the stack at the top of the System Memory or if we need\r
+// to install the stacks at the bottom of the Firmware Device (case the FD is located\r
+// at the top of the DRAM)\r
+_SetupStackPosition\r
// Compute Top of System Memory\r
LoadConstantToReg (FixedPcdGet32(PcdSystemMemoryBase), r1)\r
LoadConstantToReg (FixedPcdGet32(PcdSystemMemorySize), r2)\r
+ sub r2, r2, #1\r
add r1, r1, r2 // r1 = SystemMemoryTop = PcdSystemMemoryBase + PcdSystemMemorySize\r
-#else\r
- // If it is not a Standalone, we must compute the top of the UEFI memory with the base of the FD\r
- LoadConstantToReg (FixedPcdGet32(PcdNormalFdBaseAddress), r1)\r
-#endif\r
\r
- // Compute Base of UEFI Memory\r
- LoadConstantToReg (FixedPcdGet32(PcdSystemMemoryUefiRegionSize), r2)\r
- sub r1, r1, r2 // r1 = SystemMemoryTop - PcdSystemMemoryUefiRegionSize = UefiMemoryBase\r
+ // Calculate Top of the Firmware Device\r
+ LoadConstantToReg (FixedPcdGet32(PcdFdBaseAddress), r2)\r
+ LoadConstantToReg (FixedPcdGet32(PcdFdSize), r3)\r
+ sub r3, r3, #1\r
+ add r3, r3, r2 // r3 = FdTop = PcdFdBaseAddress + PcdFdSize\r
+\r
+ // UEFI Memory Size (stacks are allocated in this region)\r
+ LoadConstantToReg (FixedPcdGet32(PcdSystemMemoryUefiRegionSize), r4)\r
+\r
+ //\r
+ // Reserve the memory for the UEFI region (contain stacks on its top)\r
+ //\r
+\r
+ // Calculate how much space there is between the top of the Firmware and the Top of the System Memory\r
+ subs r0, r1, r3 // r0 = SystemMemoryTop - FdTop\r
+ bmi _SetupStack // Jump if negative (FdTop > SystemMemoryTop). Case when the PrePi is in XIP memory outside of the DRAM\r
+ cmp r0, r4\r
+ bge _SetupStack\r
+\r
+ // Case the top of stacks is the FdBaseAddress\r
+ mov r1, r2\r
\r
_SetupStack\r
- // Compute Base of Normal stacks for CPU Cores\r
- LoadConstantToReg (FixedPcdGet32(PcdCPUCoresNonSecStackSize), r2)\r
- mul r3, r0, r2 // r3 = core_id * stack_size = offset from the stack base\r
- sub sp, r1, r3 // r3 = UefiMemoryBase - StackOffset = TopOfStack\r
+ // r1 contains the top of the stack (and the UEFI Memory)\r
\r
- // Only allocate memory in top of the primary core stack\r
+ // Because the 'push' instruction is equivalent to 'stmdb' (decrement before), we need to increment\r
+ // one to the top of the stack. We check if incrementing one does not overflow (case of DRAM at the\r
+ // top of the memory space)\r
+ adds r6, r1, #1\r
+ bcs _SetupOverflowStack\r
+\r
+_SetupAlignedStack\r
+ mov r1, r6\r
+ b _GetBaseUefiMemory\r
+\r
+_SetupOverflowStack\r
+ // Case memory at the top of the address space. Ensure the top of the stack is EFI_PAGE_SIZE\r
+ // aligned (4KB)\r
+ LoadConstantToReg (EFI_PAGE_MASK, r6)\r
+ and r6, r6, r1\r
+ sub r1, r1, r6\r
+\r
+_GetBaseUefiMemory\r
+ // Calculate the Base of the UEFI Memory\r
+ sub r6, r1, r4\r
+\r
+_GetStackBase\r
+ // Compute Base of Normal stacks for CPU Cores\r
+ // Is it MpCore system\r
+ bl ArmIsMpCore\r
cmp r0, #0\r
+ // Case it is not an MP Core system. Just setup the primary core\r
+ beq _SetupUnicoreStack\r
+\r
+_GetStackBaseMpCore\r
+ // r1 = The top of the Mpcore Stacks\r
+ // Stack for the primary core = PrimaryCoreStack\r
+ LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), r2)\r
+ sub r7, r1, r2\r
+\r
+ // Stack for the secondary core = Number of Cluster * (4 Core per cluster) * SecondaryStackSize\r
+ LoadConstantToReg (FixedPcdGet32(PcdClusterCount), r2)\r
+ lsl r2, r2, #2\r
+ LoadConstantToReg (FixedPcdGet32(PcdCPUCoreSecondaryStackSize), r3)\r
+ mul r2, r2, r3\r
+ sub r7, r7, r2\r
+\r
+ // The base of the secondary Stacks = Top of Primary stack\r
+ LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), r2)\r
+ add r1, r7, r2\r
+\r
+ // r7 = The base of the MpCore Stacks (primary stack + cluster_count * 4 * secondary stacks)\r
+ // r1 = The base of the secondary Stacks = Top of the Primary stack\r
+\r
+ // Is it the Primary Core ?\r
+ LoadConstantToReg (FixedPcdGet32(PcdArmPrimaryCore), r4)\r
+ cmp r5, r4\r
+ beq _SetupPrimaryCoreStack\r
+\r
+_SetupSecondaryCoreStack\r
+ // r1 = The base of the secondary Stacks\r
+\r
+ // Get the position of the cores (ClusterId * 4) + CoreId\r
+ GetCorePositionInStack(r0, r5, r4)\r
+ // The stack starts at the top of the stack region. Add '1' to the Core Position to get the top of the stack\r
+ add r0, r0, #1\r
+ // Get the offset for the Secondary Stack\r
+ mul r0, r0, r3\r
+ add sp, r1, r0\r
+\r
bne _PrepareArguments\r
\r
-_AllocateGlobalPrePiVariables\r
- // Reserve top of the stack for Global PEI Variables (eg: PeiServicesTablePointer)\r
- LoadConstantToReg (FixedPcdGet32(PcdPeiGlobalVariableSize), r4)\r
- // The reserved place must be 8-bytes aligned for pushing 64-bit variable on the stack\r
- and r5, r4, #7\r
- rsb r5, r5, #8\r
- add r4, r4, r5\r
- sub sp, sp, r4\r
+_SetupPrimaryCoreStack\r
+ // r1 = Top of the primary stack\r
+ LoadConstantToReg (FixedPcdGet32(PcdPeiGlobalVariableSize), r2)\r
+ b _PreparePrimaryStack\r
+\r
+_SetupUnicoreStack\r
+ // The top of the Unicore Stack is in r1\r
+ LoadConstantToReg (FixedPcdGet32(PcdPeiGlobalVariableSize), r2)\r
+ LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), r3)\r
+\r
+ // Calculate the bottom of the primary stack (StackBase)\r
+ sub r7, r1, r3\r
+\r
+_PreparePrimaryStack\r
+ // The reserved space for global variable must be 8-bytes aligned for pushing\r
+ // 64-bit variable on the stack\r
+ SetPrimaryStack (r1, r2, r3)\r
\r
_PrepareArguments\r
- // Pass the StackBase to the C Entrypoint (UefiMemoryBase - StackSize - StackOffset)\r
- sub r2, r1, r2\r
- sub r2, r3\r
+ mov r0, r5\r
+ mov r1, r6\r
+ mov r2, r7\r
+ mov r3, sp\r
+\r
// Move sec startup address into a data register\r
// Ensure we're jumping to FV version of the code (not boot remapped alias)\r
- ldr r3, StartupAddr\r
+ ldr r4, StartupAddr\r
\r
- // jump to PrePiCore C code\r
- // r0 = core_id\r
+ // Jump to PrePiCore C code\r
+ // r0 = MpId\r
// r1 = UefiMemoryBase\r
- // r2 = StackBase\r
- blx r3\r
+ // r2 = StacksBase\r
+ // r3 = GlobalVariableBase\r
+ blx r4\r
+\r
+_NeverReturn\r
+ b _NeverReturn\r
\r
END\r
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