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1941a901f0
This SEC driver is single CPU only now, so all of the secondary stack handling is dead code, and can be removed. This removes the last remaining user of the associated PCD, so drop that as well. Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
97 lines
2.8 KiB
ArmAsm
97 lines
2.8 KiB
ArmAsm
//
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// Copyright (c) 2011 - 2020, Arm Limited. All rights reserved.<BR>
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//
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// SPDX-License-Identifier: BSD-2-Clause-Patent
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//
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//
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#include <AsmMacroIoLibV8.h>
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ASM_FUNC(_ModuleEntryPoint)
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// Do early platform specific actions
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bl ASM_PFX(ArmPlatformPeiBootAction)
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_SetSVCMode:
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// Check if we can install the stack at the top of the System Memory or if we need
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// to install the stacks at the bottom of the Firmware Device (case the FD is located
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// at the top of the DRAM)
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_SystemMemoryEndInit:
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ldr x1, mSystemMemoryEnd
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_SetupStackPosition:
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// r1 = SystemMemoryTop
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// Calculate Top of the Firmware Device
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MOV64 (x2, FixedPcdGet64(PcdFdBaseAddress))
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MOV32 (x3, FixedPcdGet32(PcdFdSize) - 1)
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sub x3, x3, #1
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add x3, x3, x2 // x3 = FdTop = PcdFdBaseAddress + PcdFdSize
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// UEFI Memory Size (stacks are allocated in this region)
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MOV32 (x4, FixedPcdGet32(PcdSystemMemoryUefiRegionSize))
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//
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// Reserve the memory for the UEFI region (contain stacks on its top)
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//
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// Calculate how much space there is between the top of the Firmware and the Top of the System Memory
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subs x0, x1, x3 // x0 = SystemMemoryTop - FdTop
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b.mi _SetupStack // Jump if negative (FdTop > SystemMemoryTop). Case when the PrePi is in XIP memory outside of the DRAM
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cmp x0, x4
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b.ge _SetupStack
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// Case the top of stacks is the FdBaseAddress
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mov x1, x2
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_SetupStack:
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// x1 contains the top of the stack (and the UEFI Memory)
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// Because the 'push' instruction is equivalent to 'stmdb' (decrement before), we need to increment
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// one to the top of the stack. We check if incrementing one does not overflow (case of DRAM at the
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// top of the memory space)
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adds x11, x1, #1
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b.cs _SetupOverflowStack
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_SetupAlignedStack:
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mov x1, x11
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b _GetBaseUefiMemory
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_SetupOverflowStack:
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// Case memory at the top of the address space. Ensure the top of the stack is EFI_PAGE_SIZE
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// aligned (4KB)
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and x1, x1, ~EFI_PAGE_MASK
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_GetBaseUefiMemory:
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// Calculate the Base of the UEFI Memory
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sub x11, x1, x4
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_GetStackBase:
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// r1 = The top of the stack
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mov sp, x1
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// Stack for the primary core = PrimaryCoreStack
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MOV32 (x2, FixedPcdGet32(PcdCPUCorePrimaryStackSize))
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sub x12, x1, x2
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// Get ID of this CPU in multi-core system
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bl ASM_PFX(ArmReadMpidr)
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mov x1, x11
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mov x2, x12
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// Move sec startup address into a data register
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// Ensure we're jumping to FV version of the code (not boot remapped alias)
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ldr x4, =ASM_PFX(CEntryPoint)
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// Set the frame pointer to NULL so any backtraces terminate here
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mov x29, xzr
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// Jump to PrePiCore C code
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// x0 = MpId
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// x1 = UefiMemoryBase
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// x2 = StacksBase
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blr x4
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_NeverReturn:
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b _NeverReturn
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