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https://github.com/CloverHackyColor/CloverBootloader.git
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142 lines
3.7 KiB
ArmAsm
142 lines
3.7 KiB
ArmAsm
#
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# Copyright (c) 2014-2018, Linaro Limited. All rights reserved.
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#
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# SPDX-License-Identifier: BSD-2-Clause-Patent
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#
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#
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GCC_ASM_EXPORT(MmioRead8Internal)
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GCC_ASM_EXPORT(MmioWrite8Internal)
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GCC_ASM_EXPORT(MmioRead16Internal)
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GCC_ASM_EXPORT(MmioWrite16Internal)
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GCC_ASM_EXPORT(MmioRead32Internal)
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GCC_ASM_EXPORT(MmioWrite32Internal)
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GCC_ASM_EXPORT(MmioRead64Internal)
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GCC_ASM_EXPORT(MmioWrite64Internal)
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//
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// Reads an 8-bit MMIO register.
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//
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// Reads the 8-bit MMIO register specified by Address. The 8-bit read value is
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// returned. This function must guarantee that all MMIO read and write
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// operations are serialized.
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//
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// @param Address The MMIO register to read.
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//
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// @return The value read.
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//
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ASM_PFX(MmioRead8Internal):
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ldrb r0, [r0]
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dmb
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bx lr
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//
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// Writes an 8-bit MMIO register.
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//
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// Writes the 8-bit MMIO register specified by Address with the value specified
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// by Value and returns Value. This function must guarantee that all MMIO read
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// and write operations are serialized.
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//
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// @param Address The MMIO register to write.
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// @param Value The value to write to the MMIO register.
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//
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ASM_PFX(MmioWrite8Internal):
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dmb st
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strb r1, [r0]
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bx lr
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//
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// Reads a 16-bit MMIO register.
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//
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// Reads the 16-bit MMIO register specified by Address. The 16-bit read value is
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// returned. This function must guarantee that all MMIO read and write
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// operations are serialized.
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//
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// @param Address The MMIO register to read.
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//
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// @return The value read.
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//
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ASM_PFX(MmioRead16Internal):
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ldrh r0, [r0]
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dmb
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bx lr
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//
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// Writes a 16-bit MMIO register.
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//
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// Writes the 16-bit MMIO register specified by Address with the value specified
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// by Value and returns Value. This function must guarantee that all MMIO read
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// and write operations are serialized.
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//
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// @param Address The MMIO register to write.
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// @param Value The value to write to the MMIO register.
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//
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ASM_PFX(MmioWrite16Internal):
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dmb st
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strh r1, [r0]
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bx lr
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//
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// Reads a 32-bit MMIO register.
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//
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// Reads the 32-bit MMIO register specified by Address. The 32-bit read value is
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// returned. This function must guarantee that all MMIO read and write
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// operations are serialized.
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//
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// @param Address The MMIO register to read.
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//
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// @return The value read.
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//
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ASM_PFX(MmioRead32Internal):
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ldr r0, [r0]
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dmb
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bx lr
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//
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// Writes a 32-bit MMIO register.
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//
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// Writes the 32-bit MMIO register specified by Address with the value specified
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// by Value and returns Value. This function must guarantee that all MMIO read
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// and write operations are serialized.
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//
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// @param Address The MMIO register to write.
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// @param Value The value to write to the MMIO register.
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//
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ASM_PFX(MmioWrite32Internal):
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dmb st
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str r1, [r0]
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bx lr
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//
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// Reads a 64-bit MMIO register.
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//
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// Reads the 64-bit MMIO register specified by Address. The 64-bit read value is
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// returned. This function must guarantee that all MMIO read and write
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// operations are serialized.
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//
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// @param Address The MMIO register to read.
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//
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// @return The value read.
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//
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ASM_PFX(MmioRead64Internal):
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ldr r1, [r0, #4]
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ldr r0, [r0]
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dmb
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bx lr
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//
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// Writes a 64-bit MMIO register.
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//
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// Writes the 64-bit MMIO register specified by Address with the value specified
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// by Value and returns Value. This function must guarantee that all MMIO read
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// and write operations are serialized.
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//
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// @param Address The MMIO register to write.
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// @param Value The value to write to the MMIO register.
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//
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ASM_PFX(MmioWrite64Internal):
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dmb st
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str r2, [r0]
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str r3, [r0, #4]
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bx lr
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