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https://github.com/CloverHackyColor/CloverBootloader.git
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117 lines
3.5 KiB
ArmAsm
117 lines
3.5 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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// Get ID of this CPU in multi-core system
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bl ASM_PFX(ArmReadMpidr)
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// Keep a copy of the MpId register value
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mov x10, x0
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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 Mpcore Stacks
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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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// Stack for the secondary core = Number of Cores - 1
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MOV32 (x1, (FixedPcdGet32(PcdCoreCount) - 1) * FixedPcdGet32(PcdCPUCoreSecondaryStackSize))
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sub x12, x12, x1
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// x12 = The base of the MpCore Stacks (primary stack & secondary stacks)
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mov x0, x12
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mov x1, x10
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//ArmPlatformStackSet(StackBase, MpId, PrimaryStackSize, SecondaryStackSize)
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MOV32 (x2, FixedPcdGet32(PcdCPUCorePrimaryStackSize))
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MOV32 (x3, FixedPcdGet32(PcdCPUCoreSecondaryStackSize))
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bl ASM_PFX(ArmPlatformStackSet)
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// Is it the Primary Core ?
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mov x0, x10
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bl ASM_PFX(ArmPlatformIsPrimaryCore)
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cmp x0, #1
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bne _PrepareArguments
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_PrepareArguments:
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mov x0, x10
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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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