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Diffstat (limited to 'scripts/dtc/libfdt/libfdt_internal.h')
| -rw-r--r-- | scripts/dtc/libfdt/libfdt_internal.h | 202 |
1 files changed, 0 insertions, 202 deletions
diff --git a/scripts/dtc/libfdt/libfdt_internal.h b/scripts/dtc/libfdt/libfdt_internal.h deleted file mode 100644 index 0e103ca..0000000 --- a/scripts/dtc/libfdt/libfdt_internal.h +++ /dev/null @@ -1,202 +0,0 @@ -/* 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 */ |