// | |
// Copyright (c) 2011 - 2020, Arm Limited. All rights reserved.<BR> | |
// | |
// SPDX-License-Identifier: BSD-2-Clause-Patent | |
// | |
// | |
#include <AsmMacroIoLibV8.h> | |
ASM_FUNC(_ModuleEntryPoint) | |
// Do early platform specific actions | |
bl ASM_PFX(ArmPlatformPeiBootAction) | |
// Get ID of this CPU in multi-core system | |
bl ASM_PFX(ArmReadMpidr) | |
// Keep a copy of the MpId register value | |
mov x10, x0 | |
_SetSVCMode: | |
// 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) | |
_SystemMemoryEndInit: | |
ldr x1, mSystemMemoryEnd | |
_SetupStackPosition: | |
// r1 = SystemMemoryTop | |
// Calculate Top of the Firmware Device | |
MOV64 (x2, FixedPcdGet64(PcdFdBaseAddress)) | |
MOV32 (x3, FixedPcdGet32(PcdFdSize) - 1) | |
sub x3, x3, #1 | |
add x3, x3, x2 // x3 = FdTop = PcdFdBaseAddress + PcdFdSize | |
// UEFI Memory Size (stacks are allocated in this region) | |
MOV32 (x4, FixedPcdGet32(PcdSystemMemoryUefiRegionSize)) | |
// | |
// 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 x0, x1, x3 // x0 = SystemMemoryTop - FdTop | |
b.mi _SetupStack // Jump if negative (FdTop > SystemMemoryTop). Case when the PrePi is in XIP memory outside of the DRAM | |
cmp x0, x4 | |
b.ge _SetupStack | |
// Case the top of stacks is the FdBaseAddress | |
mov x1, x2 | |
_SetupStack: | |
// x1 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 x11, x1, #1 | |
b.cs _SetupOverflowStack | |
_SetupAlignedStack: | |
mov x1, x11 | |
b _GetBaseUefiMemory | |
_SetupOverflowStack: | |
// Case memory at the top of the address space. Ensure the top of the stack is EFI_PAGE_SIZE | |
// aligned (4KB) | |
and x1, x1, ~EFI_PAGE_MASK | |
_GetBaseUefiMemory: | |
// Calculate the Base of the UEFI Memory | |
sub x11, x1, x4 | |
_GetStackBase: | |
// r1 = The top of the Mpcore Stacks | |
// Stack for the primary core = PrimaryCoreStack | |
MOV32 (x2, FixedPcdGet32(PcdCPUCorePrimaryStackSize)) | |
sub x12, x1, x2 | |
// Stack for the secondary core = Number of Cores - 1 | |
MOV32 (x1, (FixedPcdGet32(PcdCoreCount) - 1) * FixedPcdGet32(PcdCPUCoreSecondaryStackSize)) | |
sub x12, x12, x1 | |
// x12 = The base of the MpCore Stacks (primary stack & secondary stacks) | |
mov x0, x12 | |
mov x1, x10 | |
//ArmPlatformStackSet(StackBase, MpId, PrimaryStackSize, SecondaryStackSize) | |
MOV32 (x2, FixedPcdGet32(PcdCPUCorePrimaryStackSize)) | |
MOV32 (x3, FixedPcdGet32(PcdCPUCoreSecondaryStackSize)) | |
bl ASM_PFX(ArmPlatformStackSet) | |
// Is it the Primary Core ? | |
mov x0, x10 | |
bl ASM_PFX(ArmPlatformIsPrimaryCore) | |
cmp x0, #1 | |
bne _PrepareArguments | |
_PrepareArguments: | |
mov x0, x10 | |
mov x1, x11 | |
mov x2, x12 | |
// Move sec startup address into a data register | |
// Ensure we're jumping to FV version of the code (not boot remapped alias) | |
ldr x4, =ASM_PFX(CEntryPoint) | |
// Set the frame pointer to NULL so any backtraces terminate here | |
mov x29, xzr | |
// Jump to PrePiCore C code | |
// x0 = MpId | |
// x1 = UefiMemoryBase | |
// x2 = StacksBase | |
blr x4 | |
_NeverReturn: | |
b _NeverReturn |