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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.
#
#
.text
.align 3
GCC_ASM_EXPORT(MmioRead8Internal)
GCC_ASM_EXPORT(MmioWrite8Internal)
GCC_ASM_EXPORT(MmioRead16Internal)
GCC_ASM_EXPORT(MmioWrite16Internal)
GCC_ASM_EXPORT(MmioRead32Internal)
GCC_ASM_EXPORT(MmioWrite32Internal)
GCC_ASM_EXPORT(MmioRead64Internal)
GCC_ASM_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.
//
ASM_PFX(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.
//
ASM_PFX(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.
//
ASM_PFX(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.
//
ASM_PFX(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.
//
ASM_PFX(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.
//
ASM_PFX(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.
//
ASM_PFX(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.
//
ASM_PFX(MmioWrite64Internal):
dmb st
str x1, [x0]
ret
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