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

   1 #------------------------------------------------------------------------------
   2 #*
   3 #*   Copyright (c) 2008 - 2010, 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(EfiWriteMsr)
  30 .globl ASM_PFX(EfiGetEflags)
  31 .globl ASM_PFX(EfiDisableInterrupts)
  32 .globl ASM_PFX(EfiEnableInterrupts)
  33 .globl ASM_PFX(EfiCpuidExt)
  34
  35 .text
  36
  37
  38 #------------------------------------------------------------------------------
  39 #  VOID
  40 #  EfiHalt (
  41 #    VOID
  42 #    )
  43 #------------------------------------------------------------------------------
  44 ASM_PFX(EfiHalt):
  45     hlt
  46     retq
  47
  48
  49 #------------------------------------------------------------------------------
  50 #  VOID
  51 #  EfiWbinvd (
  52 #    VOID
  53 #    )
  54 #------------------------------------------------------------------------------
  55 ASM_PFX(EfiWbinvd):
  56     wbinvd
  57     retq
  58
  59
  60 #------------------------------------------------------------------------------
  61 #  VOID
  62 #  EfiInvd (
  63 #    VOID
  64 #    )
  65 #------------------------------------------------------------------------------
  66 ASM_PFX(EfiInvd):
  67     invd
  68     retq
  69
  70 #------------------------------------------------------------------------------
  71 #  VOID
  72 #  EfiCpuid (
  73 #    IN   UINT32              RegisterInEax,          // rcx
  74 #    OUT  EFI_CPUID_REGISTER  *Reg           OPTIONAL // rdx
  75 #    )
  76 #------------------------------------------------------------------------------
  77 ASM_PFX(EfiCpuid):
  78       push   %rbx
  79       mov    %rdx,%r8
  80       mov    %rcx,%rax
  81       cpuid
  82       cmp    $0x0,%r8
  83       je     _Exit
  84       mov    %eax,(%r8)
  85       mov    %ebx,0x4(%r8)
  86       mov    %ecx,0x8(%r8)
  87       mov    %edx,0xc(%r8)
  88 _Exit:
  89       pop    %rbx
  90       retq
  91
  92 #------------------------------------------------------------------------------
  93 #  UINT64
  94 #  EfiReadMsr (
  95 #    IN   UINT32  Index,  // rcx
  96 #    )
  97 #------------------------------------------------------------------------------
  98 ASM_PFX(EfiReadMsr):
  99       rdmsr
 100       shl    $0x20,%rdx
 101       or     %rdx,%rax
 102       retq
 103
 104 #------------------------------------------------------------------------------
 105 #  VOID
 106 #  EfiWriteMsr (
 107 #    IN   UINT32  Index,  // rcx
 108 #    IN   UINT64  Value   // rdx
 109 #    )
 110 #------------------------------------------------------------------------------
 111 ASM_PFX(EfiWriteMsr):
 112       mov    %rdx,%rax
 113       sar    $0x20,%rdx
 114       wrmsr
 115       retq
 116
 117 #------------------------------------------------------------------------------
 118 # UINT64
 119 # EfiReadTsc (
 120 #   VOID
 121 #   );
 122 #------------------------------------------------------------------------------
 123 ASM_PFX(EfiReadTsc):
 124       rdtsc
 125       shl    $0x20,%rax
 126       shrd   $0x20,%rdx,%rax
 127       retq
 128
 129 #------------------------------------------------------------------------------
 130 # VOID
 131 # EfiDisableCache (
 132 #   VOID
 133 #   );
 134 #------------------------------------------------------------------------------
 135 ASM_PFX(EfiDisableCache):
 136 # added a check to see if cache is already disabled. If it is, then skip.
 137       mov    %cr0,%rax
 138       and    $0x60000000,%rax
 139       cmp    $0x0,%rax
 140       jne    1f
 141       mov    %cr0,%rax
 142       or     $0x60000000,%rax
 143       mov    %rax,%cr0
 144       wbinvd
 145 1:
 146       retq
 147
 148 #------------------------------------------------------------------------------
 149 # VOID
 150 # EfiEnableCache (
 151 #   VOID
 152 #   );
 153 #------------------------------------------------------------------------------
 154 ASM_PFX(EfiEnableCache):
 155       wbinvd
 156       mov    %cr0,%rax
 157       and    $0xffffffff9fffffff,%rax
 158       mov    %rax,%cr0
 159       retq
 160
 161 #------------------------------------------------------------------------------
 162 # UINTN
 163 # EfiGetEflags (
 164 #   VOID
 165 #   );
 166 #------------------------------------------------------------------------------
 167 ASM_PFX(EfiGetEflags):
 168       pushfq
 169       pop    %rax
 170       retq
 171
 172 #------------------------------------------------------------------------------
 173 # VOID
 174 # EfiDisableInterrupts (
 175 #   VOID
 176 #   );
 177 #------------------------------------------------------------------------------
 178 ASM_PFX(EfiDisableInterrupts):
 179     cli
 180     ret
 181
 182 #------------------------------------------------------------------------------
 183 # VOID
 184 # EfiEnableInterrupts (
 185 #   VOID
 186 #   );
 187 #------------------------------------------------------------------------------
 188 ASM_PFX(EfiEnableInterrupts):
 189     sti
 190     ret
 191 #------------------------------------------------------------------------------
 192 #  VOID
 193 #  EfiCpuidExt (
 194 #    IN   UINT32              RegisterInEax,
 195 #    IN   UINT32              CacheLevel,
 196 #    OUT  EFI_CPUID_REGISTER  *Regs
 197 #    )
 198 #------------------------------------------------------------------------------
 199 ASM_PFX(EfiCpuidExt):
 200       push   %rbx
 201       mov    %rcx,%rax
 202       mov    %rdx,%rcx
 203       cpuid
 204       mov    %eax,(%r8)
 205       mov    %ebx,0x4(%r8)
 206       mov    %ecx,0x8(%r8)
 207       mov    %edx,0xc(%r8)
 208       pop    %rbx
 209       retq