diff options
Diffstat (limited to 'MdePkg/Library/BaseIoLibIntrinsic/Arm/ArmVirtMmio.S')
| -rw-r--r-- | MdePkg/Library/BaseIoLibIntrinsic/Arm/ArmVirtMmio.S | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseIoLibIntrinsic/Arm/ArmVirtMmio.S b/MdePkg/Library/BaseIoLibIntrinsic/Arm/ArmVirtMmio.S new file mode 100644 index 000000000000..0bc606285171 --- /dev/null +++ b/MdePkg/Library/BaseIoLibIntrinsic/Arm/ArmVirtMmio.S @@ -0,0 +1,141 @@ +# +# 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 |