| // | |
| // Copyright (c) 2011-2014, ARM Limited. All rights reserved. | |
| // | |
| // This program and the accompanying materials | |
| // are licensed and made available under the terms and conditions of the BSD License | |
| // which accompanies this distribution. The full text of the license may be found at | |
| // http://opensource.org/licenses/bsd-license.php | |
| // | |
| // THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
| // WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
| // | |
| // | |
| #include <AsmMacroIoLib.h> | |
| #include <Base.h> | |
| #include <Library/PcdLib.h> | |
| #include <AutoGen.h> | |
| #include <Chipset/ArmV7.h> | |
| .text | |
| .align 3 | |
| GCC_ASM_IMPORT(CEntryPoint) | |
| GCC_ASM_IMPORT(ArmPlatformIsPrimaryCore) | |
| GCC_ASM_IMPORT(ArmReadMpidr) | |
| GCC_ASM_IMPORT(ArmPlatformPeiBootAction) | |
| GCC_ASM_IMPORT(ArmPlatformStackSet) | |
| GCC_ASM_EXPORT(_ModuleEntryPoint) | |
| StartupAddr: .word CEntryPoint | |
| ASM_PFX(_ModuleEntryPoint): | |
| // Do early platform specific actions | |
| bl ASM_PFX(ArmPlatformPeiBootAction) | |
| // Get ID of this CPU in Multicore system | |
| bl ASM_PFX(ArmReadMpidr) | |
| // Keep a copy of the MpId register value | |
| mov r8, r0 | |
| _SetSVCMode: | |
| // Enter SVC mode, Disable FIQ and IRQ | |
| mov r1, #(CPSR_MODE_SVC | CPSR_IRQ | CPSR_FIQ) | |
| msr CPSR_c, r1 | |
| // 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: | |
| // Compute Top of System Memory | |
| LoadConstantToReg (FixedPcdGet64 (PcdSystemMemoryBase), r1) | |
| LoadConstantToReg (FixedPcdGet64 (PcdSystemMemorySize), r2) | |
| sub r2, r2, #1 | |
| add r1, r1, r2 // r1 = SystemMemoryTop = PcdSystemMemoryBase + PcdSystemMemorySize | |
| // Calculate Top of the Firmware Device | |
| LoadConstantToReg (FixedPcdGet32(PcdFdBaseAddress), r2) | |
| LoadConstantToReg (FixedPcdGet32(PcdFdSize), r3) | |
| sub r3, r3, #1 | |
| add r3, r3, r2 // r3 = FdTop = PcdFdBaseAddress + PcdFdSize | |
| // UEFI Memory Size (stacks are allocated in this region) | |
| LoadConstantToReg (FixedPcdGet32(PcdSystemMemoryUefiRegionSize), r4) | |
| // | |
| // Reserve the memory for the UEFI region (contain stacks on its top) | |
| // | |
| // Calculate how much space there is between the top of the Firmware and the Top of the System Memory | |
| 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: | |
| // r1 contains the top of the stack (and the UEFI Memory) | |
| // Because the 'push' instruction is equivalent to 'stmdb' (decrement before), we need to increment | |
| // one to the top of the stack. We check if incrementing one does not overflow (case of DRAM at the | |
| // top of the memory space) | |
| adds r9, r1, #1 | |
| bcs _SetupOverflowStack | |
| _SetupAlignedStack: | |
| mov r1, r9 | |
| b _GetBaseUefiMemory | |
| _SetupOverflowStack: | |
| // Case memory at the top of the address space. Ensure the top of the stack is EFI_PAGE_SIZE | |
| // aligned (4KB) | |
| LoadConstantToReg (EFI_PAGE_MASK, r9) | |
| and r9, r9, r1 | |
| sub r1, r1, r9 | |
| _GetBaseUefiMemory: | |
| // Calculate the Base of the UEFI Memory | |
| sub r9, r1, r4 | |
| _GetStackBase: | |
| // r1 = The top of the Mpcore Stacks | |
| // Stack for the primary core = PrimaryCoreStack | |
| LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), r2) | |
| sub r10, r1, r2 | |
| // Stack for the secondary core = Number of Cores - 1 | |
| LoadConstantToReg (FixedPcdGet32(PcdCoreCount), r0) | |
| sub r0, r0, #1 | |
| LoadConstantToReg (FixedPcdGet32(PcdCPUCoreSecondaryStackSize), r1) | |
| mul r1, r1, r0 | |
| sub r10, r10, r1 | |
| // r10 = The base of the MpCore Stacks (primary stack & secondary stacks) | |
| mov r0, r10 | |
| mov r1, r8 | |
| //ArmPlatformStackSet(StackBase, MpId, PrimaryStackSize, SecondaryStackSize) | |
| LoadConstantToReg (FixedPcdGet32(PcdCPUCorePrimaryStackSize), r2) | |
| LoadConstantToReg (FixedPcdGet32(PcdCPUCoreSecondaryStackSize), r3) | |
| bl ASM_PFX(ArmPlatformStackSet) | |
| // Is it the Primary Core ? | |
| mov r0, r8 | |
| bl ASM_PFX(ArmPlatformIsPrimaryCore) | |
| cmp r0, #1 | |
| bne _PrepareArguments | |
| _ReserveGlobalVariable: | |
| LoadConstantToReg (FixedPcdGet32(PcdPeiGlobalVariableSize), r0) | |
| // InitializePrimaryStack($GlobalVariableSize, $Tmp1) | |
| InitializePrimaryStack(r0, r1) | |
| _PrepareArguments: | |
| mov r0, r8 | |
| mov r1, r9 | |
| mov r2, r10 | |
| mov r3, sp | |
| // Move sec startup address into a data register | |
| // Ensure we're jumping to FV version of the code (not boot remapped alias) | |
| ldr r4, StartupAddr | |
| // Jump to PrePiCore C code | |
| // r0 = MpId | |
| // r1 = UefiMemoryBase | |
| // r2 = StacksBase | |
| // r3 = GlobalVariableBase | |
| blx r4 | |
| _NeverReturn: | |
| b _NeverReturn | |