mirror of https://github.com/acidanthera/audk.git
51 lines
1.5 KiB
ArmAsm
51 lines
1.5 KiB
ArmAsm
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## @file
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#
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# Copyright (c) 2013-2015 Intel Corporation.
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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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#VOID
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#AsmTransferControl (
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# IN UINT32 S3WakingVector,
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# IN UINT32 AcpiLowMemoryBase
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# );
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#-----------------------------------------
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ASM_GLOBAL ASM_PFX(AsmTransferControl)
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ASM_PFX(AsmTransferControl):
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# S3WakingVector :DWORD
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# AcpiLowMemoryBase :DWORD
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pushl %ebp
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movl %esp,%ebp
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leal LABLE, %eax
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pushl $0x28 # CS
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pushl %eax
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movl 8(%ebp),%ecx
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shrdl $20,%ecx,%ebx
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andl $0xf,%ecx
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movw %cx,%bx
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movl %ebx, jmp_addr
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lret
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LABLE:
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.byte 0xb8,0x30,0 # mov ax, 30h as selector
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movw %ax,%ds
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movw %ax,%es
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movw %ax,%fs
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movw %ax,%gs
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movw %ax,%ss
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movl %cr0, %eax # Get control register 0
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.byte 0x66
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.byte 0x83,0xe0,0xfe # and eax, 0fffffffeh ; Clear PE bit (bit #0)
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.byte 0xf,0x22,0xc0 # mov cr0, eax ; Activate real mode
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.byte 0xea # jmp far @jmp_addr
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jmp_addr:
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.long 0
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