59e0bb0cbd
2. Add AsmReadMsr() & AsmWriteMsr() for IPF architecture 3. update AsmCpuMisc.s to only support GCC tool chain to avoid symbol collision. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7034 6f19259b-4bc3-4df7-8a09-765794883524
80 lines
2.8 KiB
ArmAsm
80 lines
2.8 KiB
ArmAsm
/// @file
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/// IPF specific Machine Specific Registers accessing functions.
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///
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/// Copyright (c) 2008, Intel Corporation
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/// All rights reserved. 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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mov r8=msr[in0];;
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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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mov msr[in0] = in1
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mov r8 = in1;;
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srlz.d;;
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br.ret.sptk b0;;
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.endp AsmWriteMsr
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