projects / mirror_edk2.git / blame
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|---|---|---|
| 4134f2bd AB |
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 |