linux/scripts/dtc/libfdt/libfdt_internal.h

/* SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause) */
#ifndef LIBFDT_INTERNAL_H
#define LIBFDT_INTERNAL_H
/*
 * libfdt - Flat Device Tree manipulation
 * Copyright (C) 2006 David Gibson, IBM Corporation.
 */
#include <fdt.h>

#define FDT_ALIGN(x, a) …
#define FDT_TAGALIGN(x) …

int32_t fdt_ro_probe_(const void *fdt);
#define FDT_RO_PROBE(fdt) …

int fdt_check_node_offset_(const void *fdt, int offset);
int fdt_check_prop_offset_(const void *fdt, int offset);
const char *fdt_find_string_(const char *strtab, int tabsize, const char *s);
int fdt_node_end_offset_(void *fdt, int nodeoffset);

static inline const void *fdt_offset_ptr_(const void *fdt, int offset)
{ … }

static inline void *fdt_offset_ptr_w_(void *fdt, int offset)
{ … }

static inline const struct fdt_reserve_entry *fdt_mem_rsv_(const void *fdt, int n)
{ … }
static inline struct fdt_reserve_entry *fdt_mem_rsv_w_(void *fdt, int n)
{ … }

/*
 * Internal helpers to access tructural elements of the device tree
 * blob (rather than for exaple reading integers from within property
 * values).  We assume that we are either given a naturally aligned
 * address for the platform or if we are not, we are on a platform
 * where unaligned memory reads will be handled in a graceful manner.
 * If not the external helpers fdtXX_ld() from libfdt.h can be used
 * instead.
 */
static inline uint32_t fdt32_ld_(const fdt32_t *p)
{ … }

static inline uint64_t fdt64_ld_(const fdt64_t *p)
{ … }

#define FDT_SW_MAGIC …

/**********************************************************************/
/* Checking controls                                                  */
/**********************************************************************/

#ifndef FDT_ASSUME_MASK
#define FDT_ASSUME_MASK …
#endif

/*
 * Defines assumptions which can be enabled. Each of these can be enabled
 * individually. For maximum safety, don't enable any assumptions!
 *
 * For minimal code size and no safety, use ASSUME_PERFECT at your own risk.
 * You should have another method of validating the device tree, such as a
 * signature or hash check before using libfdt.
 *
 * For situations where security is not a concern it may be safe to enable
 * ASSUME_SANE.
 */
enum { … };

/**
 * can_assume_() - check if a particular assumption is enabled
 *
 * @mask: Mask to check (ASSUME_...)
 * @return true if that assumption is enabled, else false
 */
static inline bool can_assume_(int mask)
{ … }

/** helper macros for checking assumptions */
#define can_assume(_assume) …

#endif /* LIBFDT_INTERNAL_H */