MdePkg/Library/BaseLib/Ipf/AccessMsr.s File Reference


Detailed Description

IPF specific Machine Specific Registers accessing functions.
Copyright (c) 2008, Intel Corporation. All rights reserved.

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AsmReadMsr
Reads the current value of a Machine Specific Register (MSR).
Reads and returns the current value of the Machine Specific Register specified by Index. No
parameter checking is performed on Index, and if the Index value is beyond the implemented MSR
register range, a Reserved Register/Field fault may occur. The caller must either guarantee that
Index is valid, or the caller must set up fault handlers to catch the faults. This function is
only available on IPF.
Arguments :
On Entry : The 8-bit Machine Specific Register index to read.
Return Value: The current value of the Machine Specific Register specified by Index.
.text
.type AsmReadMsr,
.proc AsmReadMsr
.regstk 1, 0, 0, 0

AsmReadMsr::
mov r8=msr[in0];;
br.ret.sptk b0;;
.endp AsmReadMsr

AsmWriteMsr
Writes the current value of a Machine Specific Register (MSR).
Writes Value to the Machine Specific Register specified by Index. Value is returned. No
parameter checking is performed on Index, and if the Index value is beyond the implemented MSR
register range, a Reserved Register/Field fault may occur. The caller must either guarantee that
Index is valid, or the caller must set up fault handlers to catch the faults. This function is
only available on IPF.
Arguments :
On Entry : The 8-bit Machine Specific Register index to write.
The 64-bit value to write to the Machine Specific Register.
Return Value: The 64-bit value to write to the Machine Specific Register.
.text
.type AsmWriteMsr,
.proc AsmWriteMsr
.regstk 2, 0, 0, 0

AsmWriteMsr::
mov msr[in0] = in1
mov r8 = in1;;
srlz.d;;
br.ret.sptk b0;;
.endp AsmWriteMsr



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