mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-11-30 12:43:41 +01:00
144 lines
3.5 KiB
NASM
144 lines
3.5 KiB
NASM
;
|
|
; Copyright (c) 2014-2018, Linaro Limited. All rights reserved.
|
|
;
|
|
; SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
;
|
|
|
|
|
|
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
|