GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

2026-09-06 03:52:57 +08:00
commit b1928b41c0
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+/* 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 */