MdePkg/Library/BaseIoLibIntrinsic/AArch64/ArmVirtMmio.S

   1 #
   2 #  Copyright (c) 2014-2018, Linaro Limited. All rights reserved.
   3 #
   4 #  This program and the accompanying materials are licensed and made available
   5 #  under the terms and conditions of the BSD License which accompanies this
   6 #  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 #
  13
  14 .text
  15 .align 3
  16
  17 GCC_ASM_EXPORT(MmioRead8Internal)
  18 GCC_ASM_EXPORT(MmioWrite8Internal)
  19 GCC_ASM_EXPORT(MmioRead16Internal)
  20 GCC_ASM_EXPORT(MmioWrite16Internal)
  21 GCC_ASM_EXPORT(MmioRead32Internal)
  22 GCC_ASM_EXPORT(MmioWrite32Internal)
  23 GCC_ASM_EXPORT(MmioRead64Internal)
  24 GCC_ASM_EXPORT(MmioWrite64Internal)
  25
  26 //
  27 //  Reads an 8-bit MMIO register.
  28 //
  29 //  Reads the 8-bit MMIO register specified by Address. The 8-bit read value is
  30 //  returned. This function must guarantee that all MMIO read and write
  31 //  operations are serialized.
  32 //
  33 //  @param  Address The MMIO register to read.
  34 //
  35 //  @return The value read.
  36 //
  37 ASM_PFX(MmioRead8Internal):
  38   ldrb    w0, [x0]
  39   dmb     ld
  40   ret
  41
  42 //
  43 //  Writes an 8-bit MMIO register.
  44 //
  45 //  Writes the 8-bit MMIO register specified by Address with the value specified
  46 //  by Value and returns Value. This function must guarantee that all MMIO read
  47 //  and write operations are serialized.
  48 //
  49 //  @param  Address The MMIO register to write.
  50 //  @param  Value   The value to write to the MMIO register.
  51 //
  52 ASM_PFX(MmioWrite8Internal):
  53   dmb     st
  54   strb    w1, [x0]
  55   ret
  56
  57 //
  58 //  Reads a 16-bit MMIO register.
  59 //
  60 //  Reads the 16-bit MMIO register specified by Address. The 16-bit read value is
  61 //  returned. This function must guarantee that all MMIO read and write
  62 //  operations are serialized.
  63 //
  64 //  @param  Address The MMIO register to read.
  65 //
  66 //  @return The value read.
  67 //
  68 ASM_PFX(MmioRead16Internal):
  69   ldrh    w0, [x0]
  70   dmb     ld
  71   ret
  72
  73 //
  74 //  Writes a 16-bit MMIO register.
  75 //
  76 //  Writes the 16-bit MMIO register specified by Address with the value specified
  77 //  by Value and returns Value. This function must guarantee that all MMIO read
  78 //  and write operations are serialized.
  79 //
  80 //  @param  Address The MMIO register to write.
  81 //  @param  Value   The value to write to the MMIO register.
  82 //
  83 ASM_PFX(MmioWrite16Internal):
  84   dmb     st
  85   strh    w1, [x0]
  86   ret
  87
  88 //
  89 //  Reads a 32-bit MMIO register.
  90 //
  91 //  Reads the 32-bit MMIO register specified by Address. The 32-bit read value is
  92 //  returned. This function must guarantee that all MMIO read and write
  93 //  operations are serialized.
  94 //
  95 //  @param  Address The MMIO register to read.
  96 //
  97 //  @return The value read.
  98 //
  99 ASM_PFX(MmioRead32Internal):
 100   ldr     w0, [x0]
 101   dmb     ld
 102   ret
 103
 104 //
 105 //  Writes a 32-bit MMIO register.
 106 //
 107 //  Writes the 32-bit MMIO register specified by Address with the value specified
 108 //  by Value and returns Value. This function must guarantee that all MMIO read
 109 //  and write operations are serialized.
 110 //
 111 //  @param  Address The MMIO register to write.
 112 //  @param  Value   The value to write to the MMIO register.
 113 //
 114 ASM_PFX(MmioWrite32Internal):
 115   dmb     st
 116   str     w1, [x0]
 117   ret
 118
 119 //
 120 //  Reads a 64-bit MMIO register.
 121 //
 122 //  Reads the 64-bit MMIO register specified by Address. The 64-bit read value is
 123 //  returned. This function must guarantee that all MMIO read and write
 124 //  operations are serialized.
 125 //
 126 //  @param  Address The MMIO register to read.
 127 //
 128 //  @return The value read.
 129 //
 130 ASM_PFX(MmioRead64Internal):
 131   ldr     x0, [x0]
 132   dmb     ld
 133   ret
 134
 135 //
 136 //  Writes a 64-bit MMIO register.
 137 //
 138 //  Writes the 64-bit MMIO register specified by Address with the value specified
 139 //  by Value and returns Value. This function must guarantee that all MMIO read
 140 //  and write operations are serialized.
 141 //
 142 //  @param  Address The MMIO register to write.
 143 //  @param  Value   The value to write to the MMIO register.
 144 //
 145 ASM_PFX(MmioWrite64Internal):
 146   dmb     st
 147   str     x1, [x0]
 148   ret