Vlv2TbltDevicePkg/Library/CpuIA32Lib/IA32/CpuIA32.c

   1 /** @file
   2
   3   Copyright (c) 2004  - 2014, Intel Corporation. All rights reserved.<BR>
   4
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7
   8
   9 Module Name:
  10
  11
  12   CpuIA32.c
  13
  14 Abstract:
  15
  16 --*/
  17
  18 #include <Library/CpuIA32.h>
  19
  20 VOID
  21 EfiHalt (VOID)
  22 {
  23   __asm {
  24     hlt
  25   }
  26 }
  27
  28 VOID
  29 EfiWbinvd (VOID)
  30 {
  31   __asm {
  32     wbinvd
  33   }
  34 }
  35
  36 VOID
  37 EfiInvd (VOID)
  38 {
  39   __asm {
  40     invd
  41   }
  42 }
  43
  44 VOID
  45 EfiCpuid (IN UINT32 RegisterInEax,
  46           OUT EFI_CPUID_REGISTER *Reg OPTIONAL)
  47 {
  48   __asm {
  49     pushad
  50
  51     mov    eax, RegisterInEax
  52     cpuid
  53     cmp    Reg, 0
  54     je     _Exit
  55     mov    edi, DWORD PTR Reg
  56
  57     mov    DWORD PTR [edi].RegEax, eax   ; Reg->RegEax
  58     mov    DWORD PTR [edi].RegEbx, ebx   ; Reg->RegEbx
  59     mov    DWORD PTR [edi].RegEcx, ecx   ; Reg->RegEcx
  60     mov    DWORD PTR [edi].RegEdx, edx   ; Reg->RegEdx
  61
  62 _Exit:
  63      popad
  64   }
  65 }
  66
  67 UINT64
  68 EfiReadMsr (IN UINT32 Index)
  69 {
  70   __asm {
  71     mov    ecx, Index
  72     rdmsr
  73   }
  74 }
  75
  76 VOID
  77 EfiWriteMsr (
  78   IN   UINT32  Index,
  79   IN   UINT64  Value
  80   )
  81 {
  82   __asm {
  83     mov    ecx, Index
  84     mov    eax, DWORD PTR Value[0]
  85     mov    edx, DWORD PTR Value[4]
  86     wrmsr
  87   }
  88 }
  89
  90 UINT64
  91 EfiReadTsc (VOID)
  92 {
  93   __asm {
  94     rdtsc
  95   }
  96 }
  97
  98 VOID
  99 EfiDisableCache (VOID)
 100 {
 101   __asm {
 102     mov   eax, cr0
 103     bswap eax
 104     and   al, 60h
 105     cmp   al, 60h
 106     je    Exit
 107     mov   eax, cr0
 108     or    eax, 060000000h
 109     mov   cr0, eax
 110     wbinvd
 111 Exit:
 112   }
 113 }
 114
 115 VOID
 116 EfiEnableCache (VOID)
 117 {
 118   __asm {
 119     wbinvd
 120     mov   eax, cr0
 121     and   eax, 09fffffffh
 122     mov   cr0, eax
 123   }
 124 }
 125
 126 UINT32
 127 EfiGetEflags (
 128   VOID
 129   )
 130 {
 131   __asm {
 132     pushfd
 133     pop  eax
 134   }
 135 }
 136
 137 VOID
 138 EfiDisableInterrupts (VOID)
 139 {
 140   __asm {
 141     cli
 142   }
 143 }
 144
 145 VOID
 146 EfiEnableInterrupts (
 147   VOID
 148   )
 149 {
 150   __asm {
 151     sti
 152   }
 153 }
 154
 155 VOID
 156 EfiCpuidExt (
 157   IN   UINT32              RegisterInEax,
 158   IN   UINT32              CacheLevel,
 159   OUT  EFI_CPUID_REGISTER  *Regs
 160   )
 161 {
 162   __asm {
 163     pushad
 164
 165     mov    eax, RegisterInEax
 166     mov    ecx, CacheLevel
 167     cpuid
 168     mov    edi, DWORD PTR Regs
 169
 170     mov    DWORD PTR [edi].RegEax, eax   ; Reg->RegEax
 171     mov    DWORD PTR [edi].RegEbx, ebx   ; Reg->RegEbx
 172     mov    DWORD PTR [edi].RegEcx, ecx   ; Reg->RegEcx
 173     mov    DWORD PTR [edi].RegEdx, edx   ; Reg->RegEdx
 174
 175     popad
 176   }
 177 }