EdkCompatibilityPkg/Foundation/Cpu/Pentium/CpuIA32Lib/X64/Cpu.S

   1 #------------------------------------------------------------------------------
   2 #*
   3 #*   Copyright (c) 2008, Intel Corporation. All rights reserved.<BR>
   4 #*   This program and the accompanying materials
   5 #*   are licensed and made available under the terms and conditions of the BSD License
   6 #*   which accompanies this distribution.  The full text of the license may be found at
   7 #*   http://opensource.org/licenses/bsd-license.php
   8 #*
   9 #*   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 #*   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11 #*
  12 #*   Module Name:
  13 #*
  14 #*    Cpu.asm
  15 #*
  16 #*   Abstract:
  17 #*
  18 #------------------------------------------------------------------------------
  19 #include <EfiBind.h>
  20
  21 .globl ASM_PFX(EfiHalt)
  22 .globl ASM_PFX(EfiWbinvd)
  23 .globl ASM_PFX(EfiInvd)
  24 .globl ASM_PFX(EfiCpuid)
  25 .globl ASM_PFX(EfiReadTsc)
  26 .globl ASM_PFX(EfiDisableCache)
  27 .globl ASM_PFX(EfiEnableCache)
  28 .globl ASM_PFX(EfiReadMsr)
  29 .globl ASM_PFX(EfiGetEflags)
  30 .globl ASM_PFX(EfiDisableInterrupts)
  31 .globl ASM_PFX(EfiEnableInterrupts)
  32 .globl ASM_PFX(EfiCpuidExt)
  33
  34 .text
  35
  36
  37 #------------------------------------------------------------------------------
  38 #  VOID
  39 #  EfiHalt (
  40 #    VOID
  41 #    )
  42 #------------------------------------------------------------------------------
  43 ASM_PFX(EfiHalt):
  44     hlt
  45     retq
  46
  47
  48 #------------------------------------------------------------------------------
  49 #  VOID
  50 #  EfiWbinvd (
  51 #    VOID
  52 #    )
  53 #------------------------------------------------------------------------------
  54 ASM_PFX(EfiWbinvd):
  55     wbinvd
  56     retq
  57
  58
  59 #------------------------------------------------------------------------------
  60 #  VOID
  61 #  EfiInvd (
  62 #    VOID
  63 #    )
  64 #------------------------------------------------------------------------------
  65 ASM_PFX(EfiInvd):
  66     invd
  67     retq
  68
  69 #------------------------------------------------------------------------------
  70 #  VOID
  71 #  EfiCpuid (
  72 #    IN   UINT32              RegisterInEax,          // rcx
  73 #    OUT  EFI_CPUID_REGISTER  *Reg           OPTIONAL // rdx
  74 #    )
  75 #------------------------------------------------------------------------------
  76 ASM_PFX(EfiCpuid):
  77       push   %rbx
  78       mov    %rdx,%r8
  79       mov    %rcx,%rax
  80       cpuid
  81       cmp    $0x0,%r8
  82       je     _Exit
  83       mov    %eax,(%r8)
  84       mov    %ebx,0x4(%r8)
  85       mov    %ecx,0x8(%r8)
  86       mov    %edx,0xc(%r8)
  87 _Exit:
  88       pop    %rbx
  89       retq
  90
  91 #------------------------------------------------------------------------------
  92 #  UINT64
  93 #  EfiReadMsr (
  94 #    IN   UINT32  Index,  // rcx
  95 #    )
  96 #------------------------------------------------------------------------------
  97 ASM_PFX(EfiReadMsr):
  98       rdmsr
  99       shl    $0x20,%rdx
 100       or     %rdx,%rax
 101       retq
 102
 103 #------------------------------------------------------------------------------
 104 #  VOID
 105 #  EfiWriteMsr (
 106 #    IN   UINT32  Index,  // rcx
 107 #    IN   UINT64  Value   // rdx
 108 #    )
 109 #------------------------------------------------------------------------------
 110 ASM_PFX(EfiWriteMsr):
 111       mov    %rdx,%rax
 112       sar    $0x20,%rdx
 113       wrmsr
 114       retq
 115
 116 #------------------------------------------------------------------------------
 117 # UINT64
 118 # EfiReadTsc (
 119 #   VOID
 120 #   );
 121 #------------------------------------------------------------------------------
 122 ASM_PFX(EfiReadTsc):
 123       rdtsc
 124       shl    $0x20,%rax
 125       shrd   $0x20,%rdx,%rax
 126       retq
 127
 128 #------------------------------------------------------------------------------
 129 # VOID
 130 # EfiDisableCache (
 131 #   VOID
 132 #   );
 133 #------------------------------------------------------------------------------
 134 ASM_PFX(EfiDisableCache):
 135 # added a check to see if cache is already disabled. If it is, then skip.
 136       mov    %cr0,%rax
 137       and    $0x60000000,%rax
 138       cmp    $0x0,%rax
 139       jne    1f
 140       mov    %cr0,%rax
 141       or     $0x60000000,%rax
 142       mov    %rax,%cr0
 143       wbinvd
 144 1:
 145       retq
 146
 147 #------------------------------------------------------------------------------
 148 # VOID
 149 # EfiEnableCache (
 150 #   VOID
 151 #   );
 152 #------------------------------------------------------------------------------
 153 ASM_PFX(EfiEnableCache):
 154       invd
 155       mov    %cr0,%rax
 156       and    $0xffffffff9fffffff,%rax
 157       mov    %rax,%cr0
 158       retq
 159
 160 #------------------------------------------------------------------------------
 161 # UINTN
 162 # EfiGetEflags (
 163 #   VOID
 164 #   );
 165 #------------------------------------------------------------------------------
 166 ASM_PFX(EfiGetEflags):
 167       pushfq
 168       pop    %rax
 169       retq
 170
 171 #------------------------------------------------------------------------------
 172 # VOID
 173 # EfiDisableInterrupts (
 174 #   VOID
 175 #   );
 176 #------------------------------------------------------------------------------
 177 ASM_PFX(EfiDisableInterrupts):
 178     cli
 179     ret
 180
 181 #------------------------------------------------------------------------------
 182 # VOID
 183 # EfiEnableInterrupts (
 184 #   VOID
 185 #   );
 186 #------------------------------------------------------------------------------
 187 ASM_PFX(EfiEnableInterrupts):
 188     sti
 189     ret
 190 #------------------------------------------------------------------------------
 191 #  VOID
 192 #  EfiCpuidExt (
 193 #    IN   UINT32              RegisterInEax,
 194 #    IN   UINT32              CacheLevel,
 195 #    OUT  EFI_CPUID_REGISTER  *Regs
 196 #    )
 197 #------------------------------------------------------------------------------
 198 ASM_PFX(EfiCpuidExt):
 199       push   %rbx
 200       mov    %rcx,%rax
 201       mov    %rdx,%rcx
 202       cpuid
 203       mov    %eax,(%r8)
 204       mov    %ebx,0x4(%r8)
 205       mov    %ecx,0x8(%r8)
 206       mov    %edx,0xc(%r8)
 207       pop    %rbx
 208       retq