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of_fdt.h
/* SPDX-License-Identifier: GPL-2.0 */ /* * Definitions for working with the Flattened Device Tree data format * * Copyright 2009 Benjamin Herrenschmidt, IBM Corp * benh@kernel.crashing.org */ #ifndef _LINUX_OF_FDT_H #define _LINUX_OF_FDT_H #include <linux/types.h> #include <linux/init.h> #include <linux/errno.h> /* Definitions used by the flattened device tree */ #define OF_DT_HEADER 0xd00dfeed /* marker */ #ifndef __ASSEMBLY__ #if defined(CONFIG_OF_FLATTREE) struct device_node; /* For scanning an arbitrary device-tree at any time */ extern void *of_fdt_unflatten_tree(const unsigned long *blob, struct device_node *dad, struct device_node **mynodes); /* TBD: Temporary export of fdt globals - remove when code fully merged */ extern int __initdata dt_root_addr_cells; extern int __initdata dt_root_size_cells; extern void *initial_boot_params; extern phys_addr_t initial_boot_params_pa; extern char __dtb_start[]; extern char __dtb_end[]; /* Other Prototypes */ extern u64 of_flat_dt_translate_address(unsigned long node); extern void of_fdt_limit_memory(int limit); #endif /* CONFIG_OF_FLATTREE */ #ifdef CONFIG_OF_EARLY_FLATTREE /* For scanning the flat device-tree at boot time */ extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname, int depth, void *data), void *data); extern int of_scan_flat_dt_subnodes(unsigned long node, int (*it)(unsigned long node, const char *uname, void *data), void *data); extern int of_get_flat_dt_subnode_by_name(unsigned long node, const char *uname); extern const void *of_get_flat_dt_prop(unsigned long node, const char *name, int *size); extern int of_flat_dt_is_compatible(unsigned long node, const char *name); extern unsigned long of_get_flat_dt_root(void); extern uint32_t of_get_flat_dt_phandle(unsigned long node); extern int early_init_dt_scan_chosen(char *cmdline); extern int early_init_dt_scan_memory(void); extern void early_init_dt_check_for_usable_mem_range(void); extern int early_init_dt_scan_chosen_stdout(void); extern void early_init_fdt_scan_reserved_mem(void); extern void early_init_fdt_reserve_self(void); extern void early_init_dt_add_memory_arch(u64 base, u64 size); extern u64 dt_mem_next_cell(int s, const __be32 **cellp); /* Early flat tree scan hooks */ extern int early_init_dt_scan_root(void); extern bool early_init_dt_scan(void *dt_virt, phys_addr_t dt_phys); extern bool early_init_dt_verify(void *dt_virt, phys_addr_t dt_phys); extern void early_init_dt_scan_nodes(void); extern const char *of_flat_dt_get_machine_name(void); extern const void *of_flat_dt_match_machine(const void *default_match, const void * (*get_next_compat)(const char * const**)); /* Other Prototypes */ extern void unflatten_device_tree(void); extern void unflatten_and_copy_device_tree(void); extern void early_init_devtree(void *); extern void early_get_first_memblock_info(void *, phys_addr_t *); #else /* CONFIG_OF_EARLY_FLATTREE */ static inline void early_init_dt_check_for_usable_mem_range(void) {} static inline int early_init_dt_scan_chosen_stdout(void) { return -ENODEV; } static inline void early_init_fdt_scan_reserved_mem(void) {} static inline void early_init_fdt_reserve_self(void) {} static inline const char *of_flat_dt_get_machine_name(void) { return NULL; } static inline void unflatten_device_tree(void) {} static inline void unflatten_and_copy_device_tree(void) {} #endif /* CONFIG_OF_EARLY_FLATTREE */ #endif /* __ASSEMBLY__ */ #endif /* _LINUX_OF_FDT_H */
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