Vlv2TbltDevicePkg/Library/CpuIA32Lib/X64/Cpu.S

   1 #
   2 #
   3 # Copyright (c)  1999  - 2014, Intel Corporation. All rights reserved
   4 #
   5 # This program and the accompanying materials are licensed and made available under
   6 # the terms and conditions of the BSD License that accompanies this distribution.
   7 # 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 #*   Module Name:
  16 #*
  17 #*    Cpu.asm
  18 #*
  19 #*   Abstract:
  20 #*
  21 #------------------------------------------------------------------------------
  22 ##include <EfiBind.h>
  23
  24 .globl ASM_PFX(EfiHalt)
  25 .globl ASM_PFX(EfiWbinvd)
  26 .globl ASM_PFX(EfiInvd)
  27 .globl ASM_PFX(EfiCpuid)
  28 .globl ASM_PFX(EfiReadTsc)
  29 .globl ASM_PFX(EfiDisableCache)
  30 .globl ASM_PFX(EfiEnableCache)
  31 .globl ASM_PFX(EfiReadMsr)
  32 .globl ASM_PFX(EfiWriteMsr)
  33 .globl ASM_PFX(EfiGetEflags)
  34 .globl ASM_PFX(EfiDisableInterrupts)
  35 .globl ASM_PFX(EfiEnableInterrupts)
  36 .globl ASM_PFX(EfiCpuidExt)
  37
  38 .text
  39
  40
  41 #------------------------------------------------------------------------------
  42 #  VOID
  43 #  EfiHalt (
  44 #    VOID
  45 #    )
  46 #------------------------------------------------------------------------------
  47 ASM_PFX(EfiHalt):
  48     hlt
  49     retq
  50
  51
  52 #------------------------------------------------------------------------------
  53 #  VOID
  54 #  EfiWbinvd (
  55 #    VOID
  56 #    )
  57 #------------------------------------------------------------------------------
  58 ASM_PFX(EfiWbinvd):
  59     wbinvd
  60     retq
  61
  62
  63 #------------------------------------------------------------------------------
  64 #  VOID
  65 #  EfiInvd (
  66 #    VOID
  67 #    )
  68 #------------------------------------------------------------------------------
  69 ASM_PFX(EfiInvd):
  70     invd
  71     retq
  72
  73 #------------------------------------------------------------------------------
  74 #  VOID
  75 #  EfiCpuid (
  76 #    IN   UINT32              RegisterInEax,          // rcx
  77 #    OUT  EFI_CPUID_REGISTER  *Reg           OPTIONAL // rdx
  78 #    )
  79 #------------------------------------------------------------------------------
  80 ASM_PFX(EfiCpuid):
  81       push   %rbx
  82       mov    %rdx,%r8
  83       mov    %rcx,%rax
  84       cpuid
  85       cmp    $0x0,%r8
  86       je     _Exit
  87       mov    %eax,(%r8)
  88       mov    %ebx,0x4(%r8)
  89       mov    %ecx,0x8(%r8)
  90       mov    %edx,0xc(%r8)
  91 _Exit:
  92       pop    %rbx
  93       retq
  94
  95 #------------------------------------------------------------------------------
  96 #  UINT64
  97 #  EfiReadMsr (
  98 #    IN   UINT32  Index,  // rcx
  99 #    )
 100 #------------------------------------------------------------------------------
 101 ASM_PFX(EfiReadMsr):
 102       rdmsr
 103       shl    $0x20,%rdx
 104       or     %rdx,%rax
 105       retq
 106
 107 #------------------------------------------------------------------------------
 108 #  VOID
 109 #  EfiWriteMsr (
 110 #    IN   UINT32  Index,  // rcx
 111 #    IN   UINT64  Value   // rdx
 112 #    )
 113 #------------------------------------------------------------------------------
 114 ASM_PFX(EfiWriteMsr):
 115       mov    %rdx,%rax
 116       sar    $0x20,%rdx
 117       wrmsr
 118       retq
 119
 120 #------------------------------------------------------------------------------
 121 # UINT64
 122 # EfiReadTsc (
 123 #   VOID
 124 #   );
 125 #------------------------------------------------------------------------------
 126 ASM_PFX(EfiReadTsc):
 127       rdtsc
 128       shl    $0x20,%rax
 129       shrd   $0x20,%rdx,%rax
 130       retq
 131
 132 #------------------------------------------------------------------------------
 133 # VOID
 134 # EfiDisableCache (
 135 #   VOID
 136 #   );
 137 #------------------------------------------------------------------------------
 138 ASM_PFX(EfiDisableCache):
 139 # added a check to see if cache is already disabled. If it is, then skip.
 140       mov    %cr0,%rax
 141       and    $0x60000000,%rax
 142       cmp    $0x0,%rax
 143       jne    1f
 144       mov    %cr0,%rax
 145       or     $0x60000000,%rax
 146       mov    %rax,%cr0
 147       wbinvd
 148 1:
 149       retq
 150
 151 #------------------------------------------------------------------------------
 152 # VOID
 153 # EfiEnableCache (
 154 #   VOID
 155 #   );
 156 #------------------------------------------------------------------------------
 157 ASM_PFX(EfiEnableCache):
 158       wbinvd
 159       mov    %cr0,%rax
 160       and    $0xffffffff9fffffff,%rax
 161       mov    %rax,%cr0
 162       retq
 163
 164 #------------------------------------------------------------------------------
 165 # UINTN
 166 # EfiGetEflags (
 167 #   VOID
 168 #   );
 169 #------------------------------------------------------------------------------
 170 ASM_PFX(EfiGetEflags):
 171       pushfq
 172       pop    %rax
 173       retq
 174
 175 #------------------------------------------------------------------------------
 176 # VOID
 177 # EfiDisableInterrupts (
 178 #   VOID
 179 #   );
 180 #------------------------------------------------------------------------------
 181 ASM_PFX(EfiDisableInterrupts):
 182     cli
 183     ret
 184
 185 #------------------------------------------------------------------------------
 186 # VOID
 187 # EfiEnableInterrupts (
 188 #   VOID
 189 #   );
 190 #------------------------------------------------------------------------------
 191 ASM_PFX(EfiEnableInterrupts):
 192     sti
 193     ret
 194 #------------------------------------------------------------------------------
 195 #  VOID
 196 #  EfiCpuidExt (
 197 #    IN   UINT32              RegisterInEax,
 198 #    IN   UINT32              CacheLevel,
 199 #    OUT  EFI_CPUID_REGISTER  *Regs
 200 #    )
 201 #------------------------------------------------------------------------------
 202 ASM_PFX(EfiCpuidExt):
 203       push   %rbx
 204       mov    %rcx,%rax
 205       mov    %rdx,%rcx
 206       cpuid
 207       mov    %eax,(%r8)
 208       mov    %ebx,0x4(%r8)
 209       mov    %ecx,0x8(%r8)
 210       mov    %edx,0xc(%r8)
 211       pop    %rbx
 212       retq