mirror of https://github.com/acidanthera/audk.git
67 lines
2.3 KiB
ArmAsm
67 lines
2.3 KiB
ArmAsm
#------------------------------------------------------------------------------
|
|
#
|
|
# Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
|
|
# Portions copyright (c) 2011, Apple Inc. All rights reserved.
|
|
# SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
#
|
|
#------------------------------------------------------------------------------
|
|
|
|
|
|
|
|
// EFI_STATUS
|
|
// EFIAPI
|
|
// SecTemporaryRamSupport (
|
|
// IN CONST EFI_PEI_SERVICES **PeiServices, // %rcx
|
|
// IN EFI_PHYSICAL_ADDRESS TemporaryMemoryBase, // %rdx
|
|
// IN EFI_PHYSICAL_ADDRESS PermanentMemoryBase, // %r8
|
|
// IN UINTN CopySize // %r9
|
|
// )
|
|
//
|
|
ASM_GLOBAL ASM_PFX(SecTemporaryRamSupport)
|
|
ASM_PFX(SecTemporaryRamSupport):
|
|
// Adjust callers %rbp to account for stack move
|
|
subq %rdx, %rbp // Calc offset of %rbp in Temp Memory
|
|
addq %r8, %rbp // add in permanent base to offset
|
|
|
|
pushq %rbp // stack frame is for the debugger
|
|
movq %rsp, %rbp
|
|
|
|
pushq %rdx // Save TemporaryMemoryBase
|
|
pushq %r8 // Save PermanentMemoryBase
|
|
pushq %r9 // Save CopySize
|
|
|
|
//
|
|
// Copy all of temp RAM to permanent memory, including stack
|
|
//
|
|
// CopyMem (PermanentMemoryBase, TemporaryMemoryBase, CopySize);
|
|
// %rcx, %rdx, %r8
|
|
movq %r8, %rcx // Shift arguments
|
|
movq %r9, %r8
|
|
subq $0x28, %rsp // Allocate register spill area & 16-byte align stack
|
|
call ASM_PFX(CopyMem)
|
|
// Temp mem stack now copied to permanent location. %esp still in temp memory
|
|
addq $0x28, %rsp
|
|
|
|
popq %r9 // CopySize (old stack)
|
|
popq %r8 // PermanentMemoryBase (old stack)
|
|
popq %rdx // TemporaryMemoryBase (old stack)
|
|
|
|
movq %rsp, %rcx // Move to new stack
|
|
subq %rdx, %rcx // Calc offset of stack in Temp Memory
|
|
addq %r8, %rcx // Calc PermanentMemoryBase address
|
|
movq %rcx, %rsp // Update stack
|
|
// Stack now points to permanent memory
|
|
|
|
// ZeroMem (TemporaryMemoryBase /* rcx */, CopySize /* rdx */);
|
|
movq %rdx, %rcx
|
|
movq %r9, %rdx
|
|
subq $0x28, %rsp // Allocate register spill area & 16-byte align stack
|
|
call ASM_PFX(ZeroMem)
|
|
addq $0x28, %rsp
|
|
|
|
// This data comes off the NEW stack
|
|
popq %rbp
|
|
ret
|
|
|
|
|