git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2589 6f19259b...

[mirror_edk2.git] / MdePkg / Library / BaseLib / Ipf / AccessPsr.s

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