/* 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)		(((x) + (a) - 1) & ~((a) - 1))#define FDT_TAGALIGN(x)		(FDT_ALIGN((x), FDT_TAGSIZE)) int32_t fdt_ro_probe_(const void *fdt);#define FDT_RO_PROBE(fdt)						\	{								\		if (!can_assume(VALID_DTB)) {				\			int32_t totalsize_;				\			if ((totalsize_ = fdt_ro_probe_(fdt)) < 0)	\				return totalsize_;			\		}							\	} 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_len_(const char *strtab, int tabsize, const char *s,				 int s_len);static inline const char *fdt_find_string_(const char *strtab, int tabsize,					   const char *s){	return fdt_find_string_len_(strtab, tabsize, s, strlen(s));} int fdt_node_end_offset_(void *fdt, int nodeoffset); static inline const void *fdt_offset_ptr_(const void *fdt, int offset){	return (const char *)fdt + fdt_off_dt_struct(fdt) + offset;} static inline void *fdt_offset_ptr_w_(void *fdt, int offset){	return (void *)(uintptr_t)fdt_offset_ptr_(fdt, offset);} static inline const struct fdt_reserve_entry *fdt_mem_rsv_(const void *fdt, int n){	const struct fdt_reserve_entry *rsv_table =		(const struct fdt_reserve_entry *)		((const char *)fdt + fdt_off_mem_rsvmap(fdt)); 	return rsv_table + n;}static inline struct fdt_reserve_entry *fdt_mem_rsv_w_(void *fdt, int n){	return (void *)(uintptr_t)fdt_mem_rsv_(fdt, n);} /* * Internal helpers to access structural elements of the device tree * blob (rather than for example 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){	return fdt32_to_cpu(*p);} static inline uint64_t fdt64_ld_(const fdt64_t *p){	return fdt64_to_cpu(*p);} #define FDT_SW_MAGIC		(~FDT_MAGIC) /**********************************************************************//* Checking controls                                                  *//**********************************************************************/ #ifndef FDT_ASSUME_MASK#define FDT_ASSUME_MASK 0#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_PERFECT. */enum {	/*	 * This does essentially no checks. Only the latest device-tree	 * version is correctly handled. Inconsistencies or errors in the device	 * tree may cause undefined behaviour or crashes. Invalid parameters	 * passed to libfdt may do the same.	 *	 * If an error occurs when modifying the tree it may leave the tree in	 * an intermediate (but valid) state. As an example, adding a property	 * where there is insufficient space may result in the property name	 * being added to the string table even though the property itself is	 * not added to the struct section.	 *	 * Only use this if you have a fully validated device tree with	 * the latest supported version and wish to minimise code size.	 */	ASSUME_PERFECT		= 0xff, 	/*	 * This assumes that the device tree is sane. i.e. header metadata	 * and basic hierarchy are correct.	 *	 * With this assumption enabled, normal device trees produced by libfdt	 * and the compiler should be handled safely. Malicious device trees and	 * complete garbage may cause libfdt to behave badly or crash. Truncated	 * device trees (e.g. those only partially loaded) can also cause	 * problems.	 *	 * Note: Only checks that relate exclusively to the device tree itself	 * (not the parameters passed to libfdt) are disabled by this	 * assumption. This includes checking headers, tags and the like.	 */	ASSUME_VALID_DTB	= 1 << 0, 	/*	 * This builds on ASSUME_VALID_DTB and further assumes that libfdt	 * functions are called with valid parameters, i.e. not trigger	 * FDT_ERR_BADOFFSET or offsets that are out of bounds. It disables any	 * extensive checking of parameters and the device tree, making various	 * assumptions about correctness.	 *	 * It doesn't make sense to enable this assumption unless	 * ASSUME_VALID_DTB is also enabled.	 */	ASSUME_VALID_INPUT	= 1 << 1, 	/*	 * This disables checks for device-tree version and removes all code	 * which handles older versions.	 *	 * Only enable this if you know you have a device tree with the latest	 * version.	 */	ASSUME_LATEST		= 1 << 2, 	/*	 * This assumes that it is OK for a failed addition to the device tree,	 * due to lack of space or some other problem, to skip any rollback	 * steps (such as dropping the property name from the string table).	 * This is safe to enable in most circumstances, even though it may	 * leave the tree in a sub-optimal state.	 */	ASSUME_NO_ROLLBACK	= 1 << 3, 	/*	 * This assumes that the device tree components appear in a 'convenient'	 * order, i.e. the memory reservation block first, then the structure	 * block and finally the string block.	 *	 * This order is not specified by the device-tree specification,	 * but is expected by libfdt. The device-tree compiler always created	 * device trees with this order.	 *	 * This assumption disables a check in fdt_open_into() and removes the	 * ability to fix the problem there. This is safe if you know that the	 * device tree is correctly ordered. See fdt_blocks_misordered_().	 */	ASSUME_LIBFDT_ORDER	= 1 << 4, 	/*	 * This assumes that libfdt itself does not have any internal bugs. It	 * drops certain checks that should never be needed unless libfdt has an	 * undiscovered bug.	 *	 * This can generally be considered safe to enable.	 */	ASSUME_LIBFDT_FLAWLESS	= 1 << 5,}; /** * 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){	return FDT_ASSUME_MASK & mask;} /** helper macros for checking assumptions */#define can_assume(_assume)	can_assume_(ASSUME_ ## _assume) #endif /* LIBFDT_INTERNAL_H */