138 lines
4.3 KiB
C
138 lines
4.3 KiB
C
/* 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))
|
|
|
|
int fdt_ro_probe_(const void *fdt);
|
|
#define FDT_RO_PROBE(fdt) \
|
|
{ \
|
|
int totalsize_; \
|
|
if (fdt_chk_basic()) { \
|
|
totalsize_ = fdt_ro_probe_(fdt); \
|
|
if (totalsize_ < 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_(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)
|
|
{
|
|
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);
|
|
}
|
|
|
|
#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 saftey, don't enable any assumptions!
|
|
*
|
|
* For minimal code size and no safety, use FDT_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
|
|
* FDT_ASSUME_FRIENDLY.
|
|
*/
|
|
enum {
|
|
/*
|
|
* This does essentially no checks. Only the latest device-tree
|
|
* version is correctly handled. Incosistencies or errors in the device
|
|
* tree may cause undefined behaviour or crashes.
|
|
*
|
|
* 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.
|
|
*/
|
|
FDT_ASSUME_PERFECT = 0xff,
|
|
|
|
/*
|
|
* This assumes that the device tree is sane. i.e. header metadata
|
|
* and basic hierarchy are correct.
|
|
*
|
|
* These checks will be sufficient if you have a valid device tree with
|
|
* no internal inconsistencies. With this assumption, libfdt will
|
|
* generally not return -FDT_ERR_INTERNAL, -FDT_ERR_BADLAYOUT, etc.
|
|
*/
|
|
FDT_ASSUME_SANE = 1 << 0,
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
FDT_ASSUME_LATEST = 1 << 1,
|
|
|
|
/*
|
|
* This disables any extensive checking of parameters and the device
|
|
* tree, making various assumptions about correctness. 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.
|
|
*/
|
|
FDT_ASSUME_FRIENDLY = 1 << 2,
|
|
};
|
|
|
|
/** fdt_chk_basic() - see if basic checking of params and DT data is enabled */
|
|
static inline bool fdt_chk_basic(void)
|
|
{
|
|
return !(FDT_ASSUME_MASK & FDT_ASSUME_SANE);
|
|
}
|
|
|
|
/** fdt_chk_version() - see if we need to handle old versions of the DT */
|
|
static inline bool fdt_chk_version(void)
|
|
{
|
|
return !(FDT_ASSUME_MASK & FDT_ASSUME_LATEST);
|
|
}
|
|
|
|
/** fdt_chk_extra() - see if extra checking is enabled */
|
|
static inline bool fdt_chk_extra(void)
|
|
{
|
|
return !(FDT_ASSUME_MASK & FDT_ASSUME_FRIENDLY);
|
|
}
|
|
|
|
#endif /* LIBFDT_INTERNAL_H */
|