1 /// @file 2 /// IPF specific Processor Status Register accessing functions 3 /// 4 /// Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR> 5 /// This program and the accompanying materials 6 /// are licensed and made available under the terms and conditions of the BSD License 7 /// which accompanies this distribution. The full text of the license may be found at 8 /// http://opensource.org/licenses/bsd-license.php. 9 /// 10 /// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11 /// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12 /// 13 /// Module Name: AccessPsr.s 14 /// 15 /// 16 17 #define CpuModeMask 0x0000001008020000 18 19 #define CpuInVirtualMode 0x1 20 #define CpuInPhysicalMode 0x0 21 #define CpuInMixMode (0x0 - 0x1) 22 23 //--------------------------------------------------------------------------------- 24 //++ 25 // AsmReadPsr 26 // 27 // This routine is used to read the current value of Processor Status Register (PSR). 28 // 29 // Arguments : 30 // 31 // On Entry : 32 // 33 // Return Value: The current PSR value. 34 // 35 //-- 36 //---------------------------------------------------------------------------------- 37 .text 38 .type AsmReadPsr, @function 39 .proc AsmReadPsr 40 41 AsmReadPsr:: 42 mov r8 = psr;; 43 br.ret.dpnt b0;; 44 .endp AsmReadPsr 45 46 //--------------------------------------------------------------------------------- 47 //++ 48 // AsmWritePsr 49 // 50 // This routine is used to write the value of Processor Status Register (PSR). 51 // 52 // Arguments : 53 // 54 // On Entry : The value need to be written. 55 // 56 // Return Value: The value have been written. 57 // 58 //-- 59 //---------------------------------------------------------------------------------- 60 .text 61 .type AsmWritePsr, @function 62 .proc AsmWritePsr 63 .regstk 1, 0, 0, 0 64 65 AsmWritePsr:: 66 mov psr.l = in0 67 mov r8 = in0;; 68 srlz.d;; 69 srlz.i;; 70 br.ret.dpnt b0;; 71 .endp AsmWritePsr 72 73 //--------------------------------------------------------------------------------- 74 //++ 75 // AsmCpuVirtual 76 // 77 // This routine is used to determines if the CPU is currently executing 78 // in virtual, physical, or mixed mode. 79 // 80 // If the CPU is in virtual mode(PSR.RT=1, PSR.DT=1, PSR.IT=1), then 1 is returned. 81 // If the CPU is in physical mode(PSR.RT=0, PSR.DT=0, PSR.IT=0), then 0 is returned. 82 // If the CPU is not in physical mode or virtual mode, then it is in mixed mode, 83 // and -1 is returned. 84 // 85 // Arguments: 86 // 87 // On Entry: None 88 // 89 // Return Value: The CPU mode flag 90 // return 1 The CPU is in virtual mode. 91 // return 0 The CPU is in physical mode. 92 // return -1 The CPU is in mixed mode. 93 // 94 //-- 95 //---------------------------------------------------------------------------------- 96 .text 97 .type AsmCpuVirtual, @function 98 .proc AsmCpuVirtual 99 100 AsmCpuVirtual:: 101 mov r29 = psr 102 movl r30 = CpuModeMask;; 103 and r28 = r30, r29;; 104 cmp.eq p6, p7 = r30, r28;; 105 (p6) mov r8 = CpuInVirtualMode;; 106 (p6) br.ret.dpnt b0;; 107 (p7) cmp.eq p6, p7 = 0x0, r28;; 108 (p6) mov r8 = CpuInPhysicalMode;; 109 (p7) mov r8 = CpuInMixMode;; 110 br.ret.dpnt b0;; 111 .endp AsmCpuVirtual 112
