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;
; Copyright (c) 2014-2018, Linaro Limited. All rights reserved.
;
; This program and the accompanying materials are licensed and made available
; under the terms and conditions of the BSD License which accompanies this
; distribution. The full text of the license may be found at
; http:;opensource.org/licenses/bsd-license.php
;
; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
;
AREA IoLibMmio, CODE, READONLY
EXPORT MmioRead8Internal
EXPORT MmioWrite8Internal
EXPORT MmioRead16Internal
EXPORT MmioWrite16Internal
EXPORT MmioRead32Internal
EXPORT MmioWrite32Internal
EXPORT MmioRead64Internal
EXPORT MmioWrite64Internal
;
; Reads an 8-bit MMIO register.
;
; Reads the 8-bit MMIO register specified by Address. The 8-bit read value is
; returned. This function must guarantee that all MMIO read and write
; operations are serialized.
;
; @param Address The MMIO register to read.
;
; @return The value read.
;
MmioRead8Internal
ldrb w0, [x0]
dmb ld
ret
;
; Writes an 8-bit MMIO register.
;
; Writes the 8-bit MMIO register specified by Address with the value specified
; by Value and returns Value. This function must guarantee that all MMIO read
; and write operations are serialized.
;
; @param Address The MMIO register to write.
; @param Value The value to write to the MMIO register.
;
MmioWrite8Internal
dmb st
strb w1, [x0]
ret
;
; Reads a 16-bit MMIO register.
;
; Reads the 16-bit MMIO register specified by Address. The 16-bit read value is
; returned. This function must guarantee that all MMIO read and write
; operations are serialized.
;
; @param Address The MMIO register to read.
;
; @return The value read.
;
MmioRead16Internal
ldrh w0, [x0]
dmb ld
ret
;
; Writes a 16-bit MMIO register.
;
; Writes the 16-bit MMIO register specified by Address with the value specified
; by Value and returns Value. This function must guarantee that all MMIO read
; and write operations are serialized.
;
; @param Address The MMIO register to write.
; @param Value The value to write to the MMIO register.
;
MmioWrite16Internal
dmb st
strh w1, [x0]
ret
;
; Reads a 32-bit MMIO register.
;
; Reads the 32-bit MMIO register specified by Address. The 32-bit read value is
; returned. This function must guarantee that all MMIO read and write
; operations are serialized.
;
; @param Address The MMIO register to read.
;
; @return The value read.
;
MmioRead32Internal
ldr w0, [x0]
dmb ld
ret
;
; Writes a 32-bit MMIO register.
;
; Writes the 32-bit MMIO register specified by Address with the value specified
; by Value and returns Value. This function must guarantee that all MMIO read
; and write operations are serialized.
;
; @param Address The MMIO register to write.
; @param Value The value to write to the MMIO register.
;
MmioWrite32Internal
dmb st
str w1, [x0]
ret
;
; Reads a 64-bit MMIO register.
;
; Reads the 64-bit MMIO register specified by Address. The 64-bit read value is
; returned. This function must guarantee that all MMIO read and write
; operations are serialized.
;
; @param Address The MMIO register to read.
;
; @return The value read.
;
MmioRead64Internal
ldr x0, [x0]
dmb ld
ret
;
; Writes a 64-bit MMIO register.
;
; Writes the 64-bit MMIO register specified by Address with the value specified
; by Value and returns Value. This function must guarantee that all MMIO read
; and write operations are serialized.
;
; @param Address The MMIO register to write.
; @param Value The value to write to the MMIO register.
;
MmioWrite64Internal
dmb st
str x1, [x0]
ret
END
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