832709565e
ArmVirtQemuKernel and ArmVirtXen use essentially the same code to retrieve DRAM information from the DT /memory node at early boot, and invoke it via the ArmPlatformPeiBootAction () hook exposed by ArmPlatformLib. Let's move this code into the PrePi implementation these platforms share between them (and not with any other platforms) so we can eliminate another dependency on the messy ArmPlatformLib. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Laszlo Ersek <lersek@redhat.com>
216 lines
7.1 KiB
ArmAsm
216 lines
7.1 KiB
ArmAsm
//
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// Copyright (c) 2011-2013, ARM Limited. All rights reserved.
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// Copyright (c) 2015-2016, Linaro Limited. All rights reserved.
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//
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// This program and the accompanying materials
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// are licensed and made available under the terms and conditions of the BSD License
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// which accompanies this distribution. The full text of the license may be found at
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// http://opensource.org/licenses/bsd-license.php
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//
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// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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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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//
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// We are built as a ET_DYN PIE executable, so we need to process all
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// relative relocations regardless of whether or not we are executing from
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// the same offset we were linked at. This is only possible if we are
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// running from RAM.
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//
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adr x8, __reloc_base
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adr x9, __reloc_start
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adr x10, __reloc_end
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.Lreloc_loop:
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cmp x9, x10
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bhs .Lreloc_done
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//
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// AArch64 uses the ELF64 RELA format, which means each entry in the
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// relocation table consists of
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//
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// UINT64 offset : the relative offset of the value that needs to
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// be relocated
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// UINT64 info : relocation type and symbol index (the latter is
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// not used for R_AARCH64_RELATIVE relocations)
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// UINT64 addend : value to be added to the value being relocated
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//
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ldp x11, x12, [x9], #24 // read offset into x11 and info into x12
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cmp x12, #0x403 // check info == R_AARCH64_RELATIVE?
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bne .Lreloc_loop // not a relative relocation? then skip
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ldr x12, [x9, #-8] // read addend into x12
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add x12, x12, x8 // add reloc base to addend to get relocated value
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str x12, [x11, x8] // write relocated value at offset
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b .Lreloc_loop
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.Lreloc_done:
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bl ASM_PFX(DiscoverDramFromDt)
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// Get ID of this CPU in Multicore 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 x20, x0
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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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_SetupStackPosition:
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// Compute Top of System Memory
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ldr x1, PcdGet64 (PcdSystemMemoryBase)
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ldr x2, PcdGet64 (PcdSystemMemorySize)
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sub x2, x2, #1
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add x1, x1, x2 // x1 = SystemMemoryTop = PcdSystemMemoryBase + PcdSystemMemorySize
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// Calculate Top of the Firmware Device
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ldr x2, PcdGet64 (PcdFdBaseAddress)
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MOV32 (w3, FixedPcdGet32 (PcdFdSize) - 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 x21, x1, #1
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b.cs _SetupOverflowStack
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_SetupAlignedStack:
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mov x1, x21
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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 x21, 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 x22, 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 x22, x22, x1
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// x22 = The base of the MpCore Stacks (primary stack & secondary stacks)
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mov x0, x22
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mov x1, x20
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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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mov x0, x20
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mov x1, x21
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mov x2, x22
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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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bl ASM_PFX(CEntryPoint)
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_NeverReturn:
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b _NeverReturn
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// VOID
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// DiscoverDramFromDt (
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// VOID *DeviceTreeBaseAddress, // passed by loader in x0
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// VOID *ImageBase // passed by FDF trampoline in x1
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// );
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ASM_PFX(DiscoverDramFromDt):
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//
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// If we are booting from RAM using the Linux kernel boot protocol, x0 will
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// point to the DTB image in memory. Otherwise, use the default value defined
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// by the platform.
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//
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cbnz x0, 0f
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ldr x0, PcdGet64 (PcdDeviceTreeInitialBaseAddress)
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0:mov x29, x30 // preserve LR
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mov x28, x0 // preserve DTB pointer
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mov x27, x1 // preserve base of image pointer
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//
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// The base of the runtime image has been preserved in x1. Check whether
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// the expected magic number can be found in the header.
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//
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ldr w8, .LArm64LinuxMagic
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ldr w9, [x1, #0x38]
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cmp w8, w9
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bne .Lout
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//
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//
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// OK, so far so good. We have confirmed that we likely have a DTB and are
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// booting via the arm64 Linux boot protocol. Update the base-of-image PCD
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// to the actual relocated value, and add the shift of PcdFdBaseAddress to
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// PcdFvBaseAddress as well
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//
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adr x8, PcdGet64 (PcdFdBaseAddress)
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adr x9, PcdGet64 (PcdFvBaseAddress)
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ldr x6, [x8]
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ldr x7, [x9]
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sub x7, x7, x6
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add x7, x7, x1
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str x1, [x8]
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str x7, [x9]
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//
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// Discover the memory size and offset from the DTB, and record in the
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// respective PCDs. This will also return false if a corrupt DTB is
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// encountered. Since we are calling a C function, use the window at the
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// beginning of the FD image as a temp stack.
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//
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adr x1, PcdGet64 (PcdSystemMemoryBase)
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adr x2, PcdGet64 (PcdSystemMemorySize)
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mov sp, x7
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bl FindMemnode
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cbz x0, .Lout
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//
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// Copy the DTB to the slack space right after the 64 byte arm64/Linux style
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// image header at the base of this image (defined in the FDF), and record the
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// pointer in PcdDeviceTreeInitialBaseAddress.
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//
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adr x8, PcdGet64 (PcdDeviceTreeInitialBaseAddress)
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add x27, x27, #0x40
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str x27, [x8]
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mov x0, x27
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mov x1, x28
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bl CopyFdt
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.Lout:
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ret x29
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.LArm64LinuxMagic:
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.byte 0x41, 0x52, 0x4d, 0x64
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