| /// @file | |
| /// IPF specific Processor Status Register accessing functions | |
| /// | |
| /// Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR> | |
| /// This program and the accompanying materials | |
| /// are licensed and made available under the terms and conditions of the BSD License | |
| /// which accompanies this distribution. The full text of the license may be found at | |
| /// http://opensource.org/licenses/bsd-license.php. | |
| /// | |
| /// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
| /// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
| /// | |
| /// Module Name: AccessPsr.s | |
| /// | |
| /// | |
| #define CpuModeMask 0x0000001008020000 | |
| #define CpuInVirtualMode 0x1 | |
| #define CpuInPhysicalMode 0x0 | |
| #define CpuInMixMode (0x0 - 0x1) | |
| //--------------------------------------------------------------------------------- | |
| //++ | |
| // AsmReadPsr | |
| // | |
| // This routine is used to read the current value of Processor Status Register (PSR). | |
| // | |
| // Arguments : | |
| // | |
| // On Entry : | |
| // | |
| // Return Value: The current PSR value. | |
| // | |
| //-- | |
| //---------------------------------------------------------------------------------- | |
| .text | |
| .type AsmReadPsr, @function | |
| .proc AsmReadPsr | |
| AsmReadPsr:: | |
| mov r8 = psr;; | |
| br.ret.dpnt b0;; | |
| .endp AsmReadPsr | |
| //--------------------------------------------------------------------------------- | |
| //++ | |
| // AsmWritePsr | |
| // | |
| // This routine is used to write the value of Processor Status Register (PSR). | |
| // | |
| // Arguments : | |
| // | |
| // On Entry : The value need to be written. | |
| // | |
| // Return Value: The value have been written. | |
| // | |
| //-- | |
| //---------------------------------------------------------------------------------- | |
| .text | |
| .type AsmWritePsr, @function | |
| .proc AsmWritePsr | |
| .regstk 1, 0, 0, 0 | |
| AsmWritePsr:: | |
| mov psr.l = in0 | |
| mov r8 = in0;; | |
| srlz.d;; | |
| srlz.i;; | |
| br.ret.dpnt b0;; | |
| .endp AsmWritePsr | |
| //--------------------------------------------------------------------------------- | |
| //++ | |
| // AsmCpuVirtual | |
| // | |
| // This routine is used to determines if the CPU is currently executing | |
| // in virtual, physical, or mixed mode. | |
| // | |
| // If the CPU is in virtual mode(PSR.RT=1, PSR.DT=1, PSR.IT=1), then 1 is returned. | |
| // If the CPU is in physical mode(PSR.RT=0, PSR.DT=0, PSR.IT=0), then 0 is returned. | |
| // If the CPU is not in physical mode or virtual mode, then it is in mixed mode, | |
| // and -1 is returned. | |
| // | |
| // Arguments: | |
| // | |
| // On Entry: None | |
| // | |
| // Return Value: The CPU mode flag | |
| // return 1 The CPU is in virtual mode. | |
| // return 0 The CPU is in physical mode. | |
| // return -1 The CPU is in mixed mode. | |
| // | |
| //-- | |
| //---------------------------------------------------------------------------------- | |
| .text | |
| .type AsmCpuVirtual, @function | |
| .proc AsmCpuVirtual | |
| AsmCpuVirtual:: | |
| mov r29 = psr | |
| movl r30 = CpuModeMask;; | |
| and r28 = r30, r29;; | |
| cmp.eq p6, p7 = r30, r28;; | |
| (p6) mov r8 = CpuInVirtualMode;; | |
| (p6) br.ret.dpnt b0;; | |
| (p7) cmp.eq p6, p7 = 0x0, r28;; | |
| (p6) mov r8 = CpuInPhysicalMode;; | |
| (p7) mov r8 = CpuInMixMode;; | |
| br.ret.dpnt b0;; | |
| .endp AsmCpuVirtual |