93f81bd490
repo: https://github.com/T-head-Semi/opensbi commit: 89182b257c8798e15e4c685c1af0c2862d528d2a Change-Id: I7b39d66729e0108661a6f4c9e28acbdb303684ea
78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
// SPDX-License-Identifier: BSD-2-Clause
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/*
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* fdt_fixup.h - Flat Device Tree manipulation helper routines
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* Implement platform specific DT fixups on top of libfdt.
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*
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* Copyright (C) 2020 Bin Meng <bmeng.cn@gmail.com>
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*/
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#ifndef __FDT_FIXUP_H__
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#define __FDT_FIXUP_H__
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/**
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* Fix up the CPU node in the device tree
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*
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* This routine updates the "status" property of a CPU node in the device tree
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* to "disabled" if that hart is in disabled state in OpenSBI.
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*
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* It is recommended that platform codes call this helper in their final_init()
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*
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* @param fdt: device tree blob
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*/
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void fdt_cpu_fixup(void *fdt);
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/**
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* Fix up the PLIC node in the device tree
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*
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* This routine updates the "interrupt-extended" property of the PLIC node in
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* the device tree to hide the M-mode external interrupt from CPUs.
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*
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* It is recommended that platform codes call this helper in their final_init()
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*
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* @param fdt: device tree blob
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*/
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void fdt_plic_fixup(void *fdt);
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/**
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* Fix up the reserved memory node in the device tree
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*
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* This routine inserts a child node of the reserved memory node in the device
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* tree that describes the protected memory region done by OpenSBI via PMP.
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*
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* It is recommended that platform codes call this helper in their final_init()
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*
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* @param fdt: device tree blob
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* @return zero on success and -ve on failure
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*/
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int fdt_reserved_memory_fixup(void *fdt);
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/**
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* Fix up the reserved memory subnodes in the device tree
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*
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* This routine adds the no-map property to the reserved memory subnodes so
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* that the OS does not map those PMP protected memory regions.
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*
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* Platform codes must call this helper in their final_init() after fdt_fixups()
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* if the OS should not map the PMP protected reserved regions.
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*
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* @param fdt: device tree blob
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* @return zero on success and -ve on failure
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*/
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int fdt_reserved_memory_nomap_fixup(void *fdt);
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/**
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* General device tree fix-up
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*
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* This routine do all required device tree fix-ups for a typical platform.
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* It fixes up the PLIC node and the reserved memory node in the device tree
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* by calling the corresponding helper routines to accomplish the task.
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*
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* It is recommended that platform codes call this helper in their final_init()
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*
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* @param fdt: device tree blob
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*/
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void fdt_fixups(void *fdt);
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#endif /* __FDT_FIXUP_H__ */
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