MdePkg/Library/BaseLib/Ipf/ReadCr.s

   1 /// @file
   2 ///  IPF specific control register reading functions
   3 ///
   4 /// Copyright (c) 2008, 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 ///
  14 ///
  15
  16
  17
  18 //---------------------------------------------------------------------------------
  19 //++
  20 // AsmReadControlRegister
  21 //
  22 // Reads a 64-bit control register.
  23 //
  24 // Reads and returns the control register specified by Index.
  25 // If Index is invalid then 0xFFFFFFFFFFFFFFFF is returned.  This function is only available on IPF.
  26 //
  27 // Arguments :
  28 //
  29 // On Entry : The index of the control register to read.
  30 //
  31 // Return Value: The control register specified by Index.
  32 //
  33 //--
  34 //----------------------------------------------------------------------------------
  35 .text
  36 .type   AsmReadControlRegister, @function
  37 .proc   AsmReadControlRegister
  38 .regstk 1, 0, 0, 0
  39
  40 AsmReadControlRegister::
  41   //
  42   // CRs are defined in the ranges 0-25 and 64-81 (with some holes).
  43   // Compact this list by subtracting 32 from the top range.
  44   // 0-25, 64-81 -> 0-25, 32-49
  45   //
  46   mov  r15=2
  47   mov  r14=pr                    // save predicates
  48   cmp.leu  p6,p7=64,in0          // p6 = CR# >= 64
  49   ;;
  50   (p7)  cmp.leu  p7,p0=32,in0    // p7 = 32 <= CR# < 64
  51   (p6)  add  in0=-32,in0         // if (CR >= 64) CR# -= 32
  52   ;;
  53   (p7)  mov  r15=0               // if bad range (32-63)
  54   ;;
  55   mov  ret0=-1                   // in case of illegal CR #
  56   shl  r15=r15,in0               // r15 = 0x2 << CR#
  57   ;;
  58   mov  pr=r15,-1
  59   ;;
  60
  61   //
  62   // At this point the predicates contain a bit field of the
  63   // CR desired.  (The bit is the CR+1, since pr0 is always 1.)
  64   //
  65   .pred.rel "mutex",p1,p2,p3,p9,p17,p18,p20,p21,p22,p23,p24,p25,p26,\
  66     p33,p34,p35,p36,p37,p38,p39,p40,p41,p42,p43,p49,p50
  67   (p1)  mov  ret0=cr.dcr        // cr0
  68   (p2)  mov  ret0=cr.itm        // cr1
  69   (p3)  mov  ret0=cr.iva        // cr2
  70   (p9)  mov  ret0=cr.pta        // cr8
  71   (p17)  mov  ret0=cr.ipsr      // cr16
  72   (p18)  mov  ret0=cr.isr       // cr17
  73   (p20)  mov  ret0=cr.iip       // cr19
  74   (p21)  mov  ret0=cr.ifa       // cr20
  75   (p22)  mov  ret0=cr.itir      // cr21
  76   (p23)  mov  ret0=cr.iipa      // cr22
  77   (p24)  mov  ret0=cr.ifs       // cr23
  78   (p25)  mov  ret0=cr.iim       // cr24
  79   (p26)  mov  ret0=cr.iha       // cr25
  80
  81   // This is the translated (-32) range.
  82
  83   (p33)  mov  ret0=cr.lid       // cr64
  84   (p34)  mov  ret0=cr.ivr       // cr65
  85   (p35)  mov  ret0=cr.tpr       // cr66
  86   (p36)  mov  ret0=cr.eoi       // cr67
  87   (p37)  mov  ret0=cr.irr0      // cr68
  88   (p38)  mov  ret0=cr.irr1      // cr69
  89   (p39)  mov  ret0=cr.irr2      // cr70
  90   (p40)  mov  ret0=cr.irr3      // cr71
  91   (p41)  mov  ret0=cr.itv       // cr72
  92   (p42)  mov  ret0=cr.pmv       // cr73
  93   (p43)  mov  ret0=cr.cmcv      // cr74
  94   (p49)  mov  ret0=cr.lrr0      // cr80
  95   (p50)  mov  ret0=cr.lrr1      // cr81
  96
  97   //
  98   // Restore predicates and return.
  99   //
 100   mov  pr=r14,-1
 101   br.ret.sptk  b0
 102   .endp