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#------------------------------------------------------------------------------
#
# Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
# Portitions copyright (c) 2011, Apple Inc. All rights reserved.
# This program and the accompanying materials
# are licensed and made available under the terms and conditions of the BSD License
# which accompanies this distribution. The full text of the license may be found at
# http://opensource.org/licenses/bsd-license.php.
#
# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#
#------------------------------------------------------------------------------
// 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
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