projects / mirror_edk2.git / blame
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1 | /// Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>\r |
| 2 | /// This program and the accompanying materials\r | |
| c7f33ca4 | 3 | /// are licensed and made available under the terms and conditions of the BSD License\r |
| 4 | /// which accompanies this distribution. The full text of the license may be found at\r | |
| 5 | /// http://opensource.org/licenses/bsd-license.php\r | |
| 6 | ///\r | |
| 7 | /// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
| 8 | /// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 9 | ///\r | |
| 10 | /// Module Name: AccessPsr.s\r | |
| 11 | ///\r | |
| 12 | ///\r | |
| 13 | /// IPF specific Processor Status Register accessing functions\r | |
| 14 | ///\r | |
| 15 | \r | |
| 16 | #define CpuModeMask 0x0000001008020000\r | |
| 17 | \r | |
| 18 | #define CpuInVirtualMode 0x1\r | |
| 19 | #define CpuInPhysicalMode 0x0\r | |
| 20 | #define CpuInMixMode (0x0 - 0x1)\r | |
| 21 | \r | |
| 22 | //---------------------------------------------------------------------------------\r | |
| 23 | //++\r | |
| 24 | // AsmReadPsr\r | |
| 25 | //\r | |
| 26 | // This routine is used to read the current value of Processor Status Register (PSR).\r | |
| 27 | //\r | |
| 28 | // Arguments :\r | |
| 29 | //\r | |
| 30 | // On Entry :\r | |
| 31 | //\r | |
| 32 | // Return Value: The current PSR value.\r | |
| 33 | //\r | |
| 34 | //--\r | |
| 35 | //----------------------------------------------------------------------------------\r | |
| 36 | .text\r | |
| 37 | .type AsmReadPsr, @function\r | |
| 38 | .proc AsmReadPsr\r | |
| 39 | \r | |
| 40 | AsmReadPsr::\r | |
| 41 | mov r8 = psr;;\r | |
| 42 | br.ret.dpnt b0;;\r | |
| 43 | .endp AsmReadPsr\r | |
| 44 | \r | |
| 45 | //---------------------------------------------------------------------------------\r | |
| 46 | //++\r | |
| 47 | // AsmWritePsr\r | |
| 48 | //\r | |
| 49 | // This routine is used to write the value of Processor Status Register (PSR).\r | |
| 50 | //\r | |
| 51 | // Arguments :\r | |
| 52 | //\r | |
| 53 | // On Entry : The value need to be written.\r | |
| 54 | //\r | |
| 55 | // Return Value: The value have been written.\r | |
| 56 | //\r | |
| 57 | //--\r | |
| 58 | //----------------------------------------------------------------------------------\r | |
| 59 | .text\r | |
| 60 | .type AsmWritePsr, @function\r | |
| 61 | .proc AsmWritePsr\r | |
| 62 | .regstk 1, 0, 0, 0\r | |
| 63 | \r | |
| 64 | AsmWritePsr::\r | |
| 65 | mov psr.l = in0\r | |
| 66 | mov r8 = in0;;\r | |
| 67 | srlz.d;;\r | |
| 68 | srlz.i;;\r | |
| 69 | br.ret.dpnt b0;;\r | |
| 70 | .endp AsmWritePsr\r | |
| 71 | \r | |
| 72 | //---------------------------------------------------------------------------------\r | |
| 73 | //++\r | |
| 74 | // AsmCpuVirtual\r | |
| 75 | //\r | |
| 76 | // This routine is used to determines if the CPU is currently executing\r | |
| 77 | // in virtual, physical, or mixed mode.\r | |
| 78 | //\r | |
| 79 | // If the CPU is in virtual mode(PSR.RT=1, PSR.DT=1, PSR.IT=1), then 1 is returned.\r | |
| 80 | // If the CPU is in physical mode(PSR.RT=0, PSR.DT=0, PSR.IT=0), then 0 is returned.\r | |
| 81 | // If the CPU is not in physical mode or virtual mode, then it is in mixed mode,\r | |
| 82 | // and -1 is returned.\r | |
| 83 | //\r | |
| 84 | // Arguments:\r | |
| 85 | //\r | |
| 86 | // On Entry: None\r | |
| 87 | //\r | |
| 88 | // Return Value: The CPU mode flag\r | |
| 89 | // return 1 The CPU is in virtual mode.\r | |
| 90 | // return 0 The CPU is in physical mode.\r | |
| 91 | // return -1 The CPU is in mixed mode.\r | |
| 92 | //\r | |
| 93 | //--\r | |
| 94 | //----------------------------------------------------------------------------------\r | |
| 95 | .text\r | |
| 96 | .type AsmCpuVirtual, @function\r | |
| 97 | .proc AsmCpuVirtual\r | |
| 98 | \r | |
| 99 | AsmCpuVirtual::\r | |
| 100 | mov r29 = psr\r | |
| 101 | movl r30 = CpuModeMask;;\r | |
| 102 | and r28 = r30, r29;;\r | |
| 103 | cmp.eq p6, p7 = r30, r28;;\r | |
| 104 | (p6) mov r8 = CpuInVirtualMode;;\r | |
| 105 | (p7) cmp.eq p6, p7 = 0x0, r28;;\r | |
| 106 | (p6) mov r8 = CpuInPhysicalMode;;\r | |
| 107 | (p7) mov r8 = CpuInMixMode;;\r | |
| 108 | br.ret.dpnt b0;;\r | |
| 109 | .endp AsmCpuVirtual |