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146 lines
3.6 KiB
NASM
146 lines
3.6 KiB
NASM
;
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; Copyright (c) 2014-2018, Linaro Limited. All rights reserved.
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;
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; SPDX-License-Identifier: BSD-2-Clause-Patent
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;
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AREA IoLibMmio, CODE, READONLY
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EXPORT MmioRead8Internal
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EXPORT MmioWrite8Internal
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EXPORT MmioRead16Internal
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EXPORT MmioWrite16Internal
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EXPORT MmioRead32Internal
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EXPORT MmioWrite32Internal
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EXPORT MmioRead64Internal
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EXPORT MmioWrite64Internal
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;
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; Reads an 8-bit MMIO register.
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;
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; Reads the 8-bit MMIO register specified by Address. The 8-bit read value is
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; returned. This function must guarantee that all MMIO read and write
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; operations are serialized.
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;
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; @param Address The MMIO register to read.
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;
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; @return The value read.
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;
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MmioRead8Internal
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ldrb r0, [r0]
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dmb
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bx lr
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;
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; Writes an 8-bit MMIO register.
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;
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; Writes the 8-bit MMIO register specified by Address with the value specified
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; by Value and returns Value. This function must guarantee that all MMIO read
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; and write operations are serialized.
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;
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; @param Address The MMIO register to write.
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; @param Value The value to write to the MMIO register.
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;
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MmioWrite8Internal
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dmb st
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strb r1, [r0]
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bx lr
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;
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; Reads a 16-bit MMIO register.
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;
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; Reads the 16-bit MMIO register specified by Address. The 16-bit read value is
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; returned. This function must guarantee that all MMIO read and write
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; operations are serialized.
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;
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; @param Address The MMIO register to read.
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;
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; @return The value read.
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;
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MmioRead16Internal
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ldrh r0, [r0]
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dmb
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bx lr
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;
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; Writes a 16-bit MMIO register.
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;
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; Writes the 16-bit MMIO register specified by Address with the value specified
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; by Value and returns Value. This function must guarantee that all MMIO read
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; and write operations are serialized.
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;
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; @param Address The MMIO register to write.
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; @param Value The value to write to the MMIO register.
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;
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MmioWrite16Internal
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dmb st
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strh r1, [r0]
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bx lr
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;
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; Reads a 32-bit MMIO register.
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;
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; Reads the 32-bit MMIO register specified by Address. The 32-bit read value is
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; returned. This function must guarantee that all MMIO read and write
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; operations are serialized.
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;
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; @param Address The MMIO register to read.
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;
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; @return The value read.
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;
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MmioRead32Internal
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ldr r0, [r0]
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dmb
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bx lr
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;
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; Writes a 32-bit MMIO register.
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;
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; Writes the 32-bit MMIO register specified by Address with the value specified
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; by Value and returns Value. This function must guarantee that all MMIO read
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; and write operations are serialized.
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;
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; @param Address The MMIO register to write.
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; @param Value The value to write to the MMIO register.
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;
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MmioWrite32Internal
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dmb st
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str r1, [r0]
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bx lr
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;
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; Reads a 64-bit MMIO register.
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;
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; Reads the 64-bit MMIO register specified by Address. The 64-bit read value is
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; returned. This function must guarantee that all MMIO read and write
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; operations are serialized.
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;
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; @param Address The MMIO register to read.
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;
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; @return The value read.
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;
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MmioRead64Internal
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ldr r1, [r0, #4]
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ldr r0, [r0]
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dmb
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bx lr
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;
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; Writes a 64-bit MMIO register.
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;
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; Writes the 64-bit MMIO register specified by Address with the value specified
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; by Value and returns Value. This function must guarantee that all MMIO read
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; and write operations are serialized.
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;
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; @param Address The MMIO register to write.
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; @param Value The value to write to the MMIO register.
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;
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MmioWrite64Internal
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dmb st
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str r2, [r0]
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str r3, [r0, #4]
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bx lr
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END
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