mirror of https://github.com/acidanthera/audk.git
77 lines
2.8 KiB
NASM
77 lines
2.8 KiB
NASM
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;------------------------------------------------------------------------------
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;
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; Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>
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; Portitions copyright (c) 2011, Apple Inc. All rights reserved.
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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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EXTERN CopyMem:PROC
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EXTERN ZeroMem:PROC
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.code
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;------------------------------------------------------------------------------
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; EFI_STATUS
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; EFIAPI
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; SecTemporaryRamSupport (
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; IN CONST EFI_PEI_SERVICES **PeiServices, // %rcx
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; IN EFI_PHYSICAL_ADDRESS TemporaryMemoryBase, // %rdx
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; IN EFI_PHYSICAL_ADDRESS PermanentMemoryBase, // %r8
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; IN UINTN CopySize // %r9
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; )
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;------------------------------------------------------------------------------
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SecTemporaryRamSupport PROC
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; Adjust callers %rbp to account for stack move
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sub rbp, rdx ; Calc offset of %rbp in Temp Memory
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add rbp, r8 ; add in permanent base to offset
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push rbp ; stack frame is for the debugger
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mov rbp, rsp
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push rdx ; Save TemporaryMemoryBase
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push r8 ; Save PermanentMemoryBase
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push r9 ; Save CopySize
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;
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; Copy all of temp RAM to permanent memory, including stack
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;
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; CopyMem (PermanentMemoryBase, TemporaryMemoryBase, CopySize);
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; %rcx, %rdx, %r8
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mov rcx, r8 ; Shift arguments
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mov r8, r9
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sub rsp, 028h ; Allocate register spill area & 16-byte align stack
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call CopyMem
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; Temp mem stack now copied to permanent location. %esp still in temp memory
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add rsp, 028h
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pop r9 ; CopySize (old stack)
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pop r8 ; PermanentMemoryBase (old stack)
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pop rdx ; TemporaryMemoryBase (old stack)
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mov rcx, rsp ; Move to new stack
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sub rcx, rdx ; Calc offset of stack in Temp Memory
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add rcx, r8 ; Calc PermanentMemoryBase address
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mov rsp, rcx ; Update stack
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; Stack now points to permanent memory
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; ZeroMem (TemporaryMemoryBase /* rcx */, CopySize /* rdx */);
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mov rcx, rdx
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mov rdx, r9
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sub rsp, 028h ; Allocate register spill area & 16-byte align stack
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call ZeroMem
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add rsp, 028h
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; This data comes off the NEW stack
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pop rbp
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ret
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SecTemporaryRamSupport ENDP
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END
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