1 /// @file 2 /// IPF specific Machine Specific Registers accessing functions. 3 /// This implementation uses raw data to prepresent the assembly instruction of 4 /// mov msr[]= and mov =msr[]. 5 /// 6 /// Copyright (c) 2008, Intel Corporation. All rights reserved.<BR> 7 /// This program and the accompanying materials 8 /// are licensed and made available under the terms and conditions of the BSD License 9 /// which accompanies this distribution. The full text of the license may be found at 10 /// http://opensource.org/licenses/bsd-license.php. 11 /// 12 /// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 13 /// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 14 /// 15 /// 16 /// 17 18 19 //--------------------------------------------------------------------------------- 20 //++ 21 // AsmReadMsr 22 // 23 // Reads the current value of a Machine Specific Register (MSR). 24 // 25 // Reads and returns the current value of the Machine Specific Register specified by Index. No 26 // parameter checking is performed on Index, and if the Index value is beyond the implemented MSR 27 // register range, a Reserved Register/Field fault may occur. The caller must either guarantee that 28 // Index is valid, or the caller must set up fault handlers to catch the faults. This function is 29 // only available on IPF. 30 // 31 // Arguments : 32 // 33 // On Entry : The 8-bit Machine Specific Register index to read. 34 // 35 // Return Value: The current value of the Machine Specific Register specified by Index. 36 // 37 //-- 38 //---------------------------------------------------------------------------------- 39 .text 40 .type AsmReadMsr, @function 41 .proc AsmReadMsr 42 .regstk 1, 0, 0, 0 43 44 AsmReadMsr:: 45 // 46 // The follow 16 bytes stand for the bundle of 47 // mov r8=msr[in0];; 48 // since MSFT tool chain does not support mov =msr[] instruction 49 // 50 data1 0x0D 51 data1 0x40 52 data1 0x00 53 data1 0x40 54 data1 0x16 55 data1 0x04 56 data1 0x00 57 data1 0x00 58 data1 0x00 59 data1 0x02 60 data1 0x00 61 data1 0x00 62 data1 0x00 63 data1 0x00 64 data1 0x04 65 data1 0x00 66 br.ret.sptk b0;; 67 .endp AsmReadMsr 68 69 //--------------------------------------------------------------------------------- 70 //++ 71 // AsmWriteMsr 72 // 73 // Writes the current value of a Machine Specific Register (MSR). 74 // 75 // Writes Value to the Machine Specific Register specified by Index. Value is returned. No 76 // parameter checking is performed on Index, and if the Index value is beyond the implemented MSR 77 // register range, a Reserved Register/Field fault may occur. The caller must either guarantee that 78 // Index is valid, or the caller must set up fault handlers to catch the faults. This function is 79 // only available on IPF. 80 // 81 // Arguments : 82 // 83 // On Entry : The 8-bit Machine Specific Register index to write. 84 // The 64-bit value to write to the Machine Specific Register. 85 // 86 // Return Value: The 64-bit value to write to the Machine Specific Register. 87 // 88 //-- 89 //---------------------------------------------------------------------------------- 90 .text 91 .type AsmWriteMsr, @function 92 .proc AsmWriteMsr 93 .regstk 2, 0, 0, 0 94 95 AsmWriteMsr:: 96 // 97 // The follow 16 bytes stand for the bundle of 98 // mov msr[in0] = in1 99 // mov r8 = in1;; 100 // since MSFT tool chain does not support mov msr[]= instruction 101 // 102 data1 0x0D 103 data1 0x00 104 data1 0x84 105 data1 0x40 106 data1 0x06 107 data1 0x04 108 data1 0x00 109 data1 0x00 110 data1 0x00 111 data1 0x02 112 data1 0x00 113 data1 0x00 114 data1 0x01 115 data1 0x08 116 data1 0x01 117 data1 0x84 118 srlz.d;; 119 br.ret.sptk b0;; 120 .endp AsmWriteMsr 121 122
