MdePkg/Library/BaseIoLibIntrinsic/Arm/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 GCC_ASM_EXPORT(MmioRead8Internal)
  15 GCC_ASM_EXPORT(MmioWrite8Internal)
  16 GCC_ASM_EXPORT(MmioRead16Internal)
  17 GCC_ASM_EXPORT(MmioWrite16Internal)
  18 GCC_ASM_EXPORT(MmioRead32Internal)
  19 GCC_ASM_EXPORT(MmioWrite32Internal)
  20 GCC_ASM_EXPORT(MmioRead64Internal)
  21 GCC_ASM_EXPORT(MmioWrite64Internal)
  22
  23 //
  24 //  Reads an 8-bit MMIO register.
  25 //
  26 //  Reads the 8-bit MMIO register specified by Address. The 8-bit read value is
  27 //  returned. This function must guarantee that all MMIO read and write
  28 //  operations are serialized.
  29 //
  30 //  @param  Address The MMIO register to read.
  31 //
  32 //  @return The value read.
  33 //
  34 ASM_PFX(MmioRead8Internal):
  35   ldrb    r0, [r0]
  36   dmb
  37   bx      lr
  38
  39 //
  40 //  Writes an 8-bit MMIO register.
  41 //
  42 //  Writes the 8-bit MMIO register specified by Address with the value specified
  43 //  by Value and returns Value. This function must guarantee that all MMIO read
  44 //  and write operations are serialized.
  45 //
  46 //  @param  Address The MMIO register to write.
  47 //  @param  Value   The value to write to the MMIO register.
  48 //
  49 ASM_PFX(MmioWrite8Internal):
  50   dmb     st
  51   strb    r1, [r0]
  52   bx      lr
  53
  54 //
  55 //  Reads a 16-bit MMIO register.
  56 //
  57 //  Reads the 16-bit MMIO register specified by Address. The 16-bit read value is
  58 //  returned. This function must guarantee that all MMIO read and write
  59 //  operations are serialized.
  60 //
  61 //  @param  Address The MMIO register to read.
  62 //
  63 //  @return The value read.
  64 //
  65 ASM_PFX(MmioRead16Internal):
  66   ldrh    r0, [r0]
  67   dmb
  68   bx      lr
  69
  70 //
  71 //  Writes a 16-bit MMIO register.
  72 //
  73 //  Writes the 16-bit MMIO register specified by Address with the value specified
  74 //  by Value and returns Value. This function must guarantee that all MMIO read
  75 //  and write operations are serialized.
  76 //
  77 //  @param  Address The MMIO register to write.
  78 //  @param  Value   The value to write to the MMIO register.
  79 //
  80 ASM_PFX(MmioWrite16Internal):
  81   dmb     st
  82   strh    r1, [r0]
  83   bx      lr
  84
  85 //
  86 //  Reads a 32-bit MMIO register.
  87 //
  88 //  Reads the 32-bit MMIO register specified by Address. The 32-bit read value is
  89 //  returned. This function must guarantee that all MMIO read and write
  90 //  operations are serialized.
  91 //
  92 //  @param  Address The MMIO register to read.
  93 //
  94 //  @return The value read.
  95 //
  96 ASM_PFX(MmioRead32Internal):
  97   ldr     r0, [r0]
  98   dmb
  99   bx      lr
 100
 101 //
 102 //  Writes a 32-bit MMIO register.
 103 //
 104 //  Writes the 32-bit MMIO register specified by Address with the value specified
 105 //  by Value and returns Value. This function must guarantee that all MMIO read
 106 //  and write operations are serialized.
 107 //
 108 //  @param  Address The MMIO register to write.
 109 //  @param  Value   The value to write to the MMIO register.
 110 //
 111 ASM_PFX(MmioWrite32Internal):
 112   dmb     st
 113   str     r1, [r0]
 114   bx      lr
 115
 116 //
 117 //  Reads a 64-bit MMIO register.
 118 //
 119 //  Reads the 64-bit MMIO register specified by Address. The 64-bit read value is
 120 //  returned. This function must guarantee that all MMIO read and write
 121 //  operations are serialized.
 122 //
 123 //  @param  Address The MMIO register to read.
 124 //
 125 //  @return The value read.
 126 //
 127 ASM_PFX(MmioRead64Internal):
 128   ldrd    r0, r1, [r0]
 129   dmb
 130   bx      lr
 131
 132 //
 133 //  Writes a 64-bit MMIO register.
 134 //
 135 //  Writes the 64-bit MMIO register specified by Address with the value specified
 136 //  by Value and returns Value. This function must guarantee that all MMIO read
 137 //  and write operations are serialized.
 138 //
 139 //  @param  Address The MMIO register to write.
 140 //  @param  Value   The value to write to the MMIO register.
 141 //
 142 ASM_PFX(MmioWrite64Internal):
 143   dmb     st
 144   strd    r2, r3, [r0]
 145   bx      lr