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f0921f5098
Bring over the fdt from this commit: 430419c (origin/master) tests: fix some python warnings adding in the 'assumptions' series designed to reduce code size. Signed-off-by: Simon Glass <sjg@chromium.org>
138 lines
4.3 KiB
C
138 lines
4.3 KiB
C
/* SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause) */
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#ifndef LIBFDT_INTERNAL_H
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#define LIBFDT_INTERNAL_H
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/*
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* libfdt - Flat Device Tree manipulation
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* Copyright (C) 2006 David Gibson, IBM Corporation.
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*/
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#include <fdt.h>
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#define FDT_ALIGN(x, a) (((x) + (a) - 1) & ~((a) - 1))
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#define FDT_TAGALIGN(x) (FDT_ALIGN((x), FDT_TAGSIZE))
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int fdt_ro_probe_(const void *fdt);
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#define FDT_RO_PROBE(fdt) \
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{ \
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int totalsize_; \
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if (fdt_chk_basic()) { \
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totalsize_ = fdt_ro_probe_(fdt); \
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if (totalsize_ < 0) \
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return totalsize_; \
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} \
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}
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int fdt_check_node_offset_(const void *fdt, int offset);
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int fdt_check_prop_offset_(const void *fdt, int offset);
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const char *fdt_find_string_(const char *strtab, int tabsize, const char *s);
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int fdt_node_end_offset_(void *fdt, int nodeoffset);
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static inline const void *fdt_offset_ptr_(const void *fdt, int offset)
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{
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return (const char *)fdt + fdt_off_dt_struct(fdt) + offset;
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}
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static inline void *fdt_offset_ptr_w_(void *fdt, int offset)
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{
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return (void *)(uintptr_t)fdt_offset_ptr_(fdt, offset);
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}
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static inline const struct fdt_reserve_entry *fdt_mem_rsv_(const void *fdt, int n)
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{
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const struct fdt_reserve_entry *rsv_table =
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(const struct fdt_reserve_entry *)
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((const char *)fdt + fdt_off_mem_rsvmap(fdt));
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return rsv_table + n;
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}
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static inline struct fdt_reserve_entry *fdt_mem_rsv_w_(void *fdt, int n)
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{
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return (void *)(uintptr_t)fdt_mem_rsv_(fdt, n);
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}
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#define FDT_SW_MAGIC (~FDT_MAGIC)
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/**********************************************************************/
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/* Checking controls */
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/**********************************************************************/
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#ifndef FDT_ASSUME_MASK
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#define FDT_ASSUME_MASK 0
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#endif
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/*
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* Defines assumptions which can be enabled. Each of these can be enabled
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* individually. For maximum saftey, don't enable any assumptions!
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*
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* For minimal code size and no safety, use FDT_ASSUME_PERFECT at your own risk.
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* You should have another method of validating the device tree, such as a
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* signature or hash check before using libfdt.
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*
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* For situations where security is not a concern it may be safe to enable
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* FDT_ASSUME_FRIENDLY.
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*/
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enum {
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/*
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* This does essentially no checks. Only the latest device-tree
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* version is correctly handled. Incosistencies or errors in the device
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* tree may cause undefined behaviour or crashes.
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*
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* If an error occurs when modifying the tree it may leave the tree in
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* an intermediate (but valid) state. As an example, adding a property
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* where there is insufficient space may result in the property name
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* being added to the string table even though the property itself is
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* not added to the struct section.
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*
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* Only use this if you have a fully validated device tree with
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* the latest supported version and wish to minimise code size.
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*/
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FDT_ASSUME_PERFECT = 0xff,
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/*
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* This assumes that the device tree is sane. i.e. header metadata
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* and basic hierarchy are correct.
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*
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* These checks will be sufficient if you have a valid device tree with
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* no internal inconsistencies. With this assumption, libfdt will
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* generally not return -FDT_ERR_INTERNAL, -FDT_ERR_BADLAYOUT, etc.
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*/
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FDT_ASSUME_SANE = 1 << 0,
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/*
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* This disables checks for device-tree version and removes all code
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* which handles older versions.
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*
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* Only enable this if you know you have a device tree with the latest
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* version.
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*/
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FDT_ASSUME_LATEST = 1 << 1,
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/*
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* This disables any extensive checking of parameters and the device
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* tree, making various assumptions about correctness. Normal device
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* trees produced by libfdt and the compiler should be handled safely.
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* Malicious device trees and complete garbage may cause libfdt to
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* behave badly or crash.
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*/
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FDT_ASSUME_FRIENDLY = 1 << 2,
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};
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/** fdt_chk_basic() - see if basic checking of params and DT data is enabled */
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static inline bool fdt_chk_basic(void)
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{
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return !(FDT_ASSUME_MASK & FDT_ASSUME_SANE);
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}
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/** fdt_chk_version() - see if we need to handle old versions of the DT */
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static inline bool fdt_chk_version(void)
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{
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return !(FDT_ASSUME_MASK & FDT_ASSUME_LATEST);
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}
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/** fdt_chk_extra() - see if extra checking is enabled */
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static inline bool fdt_chk_extra(void)
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{
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return !(FDT_ASSUME_MASK & FDT_ASSUME_FRIENDLY);
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}
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#endif /* LIBFDT_INTERNAL_H */
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