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#
# Copyright (c) 2014-2018, Linaro Limited. All rights reserved.
#
# SPDX-License-Identifier: BSD-2-Clause-Patent
#
#
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 r0, [r0]
dmb
bx lr
//
// 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 r1, [r0]
bx lr
//
// 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 r0, [r0]
dmb
bx lr
//
// 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 r1, [r0]
bx lr
//
// 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 r0, [r0]
dmb
bx lr
//
// 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 r1, [r0]
bx lr
//
// 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 r1, [r0, #4]
ldr r0, [r0]
dmb
bx lr
//
// 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 r2, [r0]
str r3, [r0, #4]
bx lr
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