mirror of https://github.com/acidanthera/audk.git
122 lines
3.6 KiB
ArmAsm
122 lines
3.6 KiB
ArmAsm
/// @file
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/// IPF specific Machine Specific Registers accessing functions.
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/// This implementation uses raw data to prepresent the assembly instruction of
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/// mov msr[]= and mov =msr[].
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///
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/// Copyright (c) 2008, Intel Corporation. All rights reserved.<BR>
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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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///
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//---------------------------------------------------------------------------------
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//++
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// AsmReadMsr
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//
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// Reads the current value of a Machine Specific Register (MSR).
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//
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// Reads and returns the current value of the Machine Specific Register specified by Index. No
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// parameter checking is performed on Index, and if the Index value is beyond the implemented MSR
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// register range, a Reserved Register/Field fault may occur. The caller must either guarantee that
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// Index is valid, or the caller must set up fault handlers to catch the faults. This function is
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// only available on IPF.
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//
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// Arguments :
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//
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// On Entry : The 8-bit Machine Specific Register index to read.
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//
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// Return Value: The current value of the Machine Specific Register specified by Index.
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//
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//--
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//----------------------------------------------------------------------------------
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.text
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.type AsmReadMsr, @function
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.proc AsmReadMsr
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.regstk 1, 0, 0, 0
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AsmReadMsr::
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//
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// The follow 16 bytes stand for the bundle of
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// mov r8=msr[in0];;
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// since MSFT tool chain does not support mov =msr[] instruction
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//
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data1 0x0D
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data1 0x40
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data1 0x00
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data1 0x40
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data1 0x16
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data1 0x04
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data1 0x00
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data1 0x00
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data1 0x00
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data1 0x02
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data1 0x00
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data1 0x00
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data1 0x00
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data1 0x00
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data1 0x04
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data1 0x00
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br.ret.sptk b0;;
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.endp AsmReadMsr
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//---------------------------------------------------------------------------------
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//++
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// AsmWriteMsr
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//
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// Writes the current value of a Machine Specific Register (MSR).
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//
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// Writes Value to the Machine Specific Register specified by Index. Value is returned. No
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// parameter checking is performed on Index, and if the Index value is beyond the implemented MSR
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// register range, a Reserved Register/Field fault may occur. The caller must either guarantee that
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// Index is valid, or the caller must set up fault handlers to catch the faults. This function is
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// only available on IPF.
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//
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// Arguments :
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//
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// On Entry : The 8-bit Machine Specific Register index to write.
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// The 64-bit value to write to the Machine Specific Register.
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//
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// Return Value: The 64-bit value to write to the Machine Specific Register.
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//
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//--
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//----------------------------------------------------------------------------------
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.text
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.type AsmWriteMsr, @function
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.proc AsmWriteMsr
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.regstk 2, 0, 0, 0
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AsmWriteMsr::
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//
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// The follow 16 bytes stand for the bundle of
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// mov msr[in0] = in1
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// mov r8 = in1;;
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// since MSFT tool chain does not support mov msr[]= instruction
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//
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data1 0x0D
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data1 0x00
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data1 0x84
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data1 0x40
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data1 0x06
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data1 0x04
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data1 0x00
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data1 0x00
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data1 0x00
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data1 0x02
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data1 0x00
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data1 0x00
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data1 0x01
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data1 0x08
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data1 0x01
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data1 0x84
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srlz.d;;
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br.ret.sptk b0;;
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.endp AsmWriteMsr
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