1 #------------------------------------------------------------------------------ 2 # 3 # Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR> 4 # Portitions copyright (c) 2011, Apple Inc. All rights reserved. 5 # This program and the accompanying materials 6 # are licensed and made available under the terms and conditions of the BSD License 7 # which accompanies this distribution. The full text of the license may be found at 8 # http://opensource.org/licenses/bsd-license.php. 9 # 10 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12 # 13 #------------------------------------------------------------------------------ 14 15 16 17 // EFI_STATUS 18 // EFIAPI 19 // SecTemporaryRamSupport ( 20 // IN CONST EFI_PEI_SERVICES **PeiServices, // %rcx 21 // IN EFI_PHYSICAL_ADDRESS TemporaryMemoryBase, // %rdx 22 // IN EFI_PHYSICAL_ADDRESS PermanentMemoryBase, // %r8 23 // IN UINTN CopySize // %r9 24 // ) 25 // 26 ASM_GLOBAL ASM_PFX(SecTemporaryRamSupport) 27 ASM_PFX(SecTemporaryRamSupport): 28 // Adjust callers %rbp to account for stack move 29 subq %rdx, %rbp // Calc offset of %rbp in Temp Memory 30 addq %r8, %rbp // add in permanent base to offset 31 32 pushq %rbp // stack frame is for the debugger 33 movq %rsp, %rbp 34 35 pushq %rdx // Save TemporaryMemoryBase 36 pushq %r8 // Save PermanentMemoryBase 37 pushq %r9 // Save CopySize 38 39 // 40 // Copy all of temp RAM to permanent memory, including stack 41 // 42 // CopyMem (PermanentMemoryBase, TemporaryMemoryBase, CopySize); 43 // %rcx, %rdx, %r8 44 movq %r8, %rcx // Shift arguments 45 movq %r9, %r8 46 subq $0x28, %rsp // Allocate register spill area & 16-byte align stack 47 call ASM_PFX(CopyMem) 48 // Temp mem stack now copied to permanent location. %esp still in temp memory 49 addq $0x28, %rsp 50 51 popq %r9 // CopySize (old stack) 52 popq %r8 // PermanentMemoryBase (old stack) 53 popq %rdx // TemporaryMemoryBase (old stack) 54 55 movq %rsp, %rcx // Move to new stack 56 subq %rdx, %rcx // Calc offset of stack in Temp Memory 57 addq %r8, %rcx // Calc PermanentMemoryBase address 58 movq %rcx, %rsp // Update stack 59 // Stack now points to permanent memory 60 61 // ZeroMem (TemporaryMemoryBase /* rcx */, CopySize /* rdx */); 62 movq %rdx, %rcx 63 movq %r9, %rdx 64 subq $0x28, %rsp // Allocate register spill area & 16-byte align stack 65 call ASM_PFX(ZeroMem) 66 addq $0x28, %rsp 67 68 // This data comes off the NEW stack 69 popq %rbp 70 ret 71 72 73
