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- /* SPDX-License-Identifier: GPL-2.0 */
- /*
- * Definitions for working with the Flattened Device Tree data format
- *
- * Copyright 2009 Benjamin Herrenschmidt, IBM Corp
- * [email protected]
- */
- #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 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);
- /*
- * early_init_dt_scan_chosen - scan the device tree for ramdisk and bootargs
- *
- * The boot arguments will be placed into the memory pointed to by @data.
- * That memory should be COMMAND_LINE_SIZE big and initialized to be a valid
- * (possibly empty) string. Logic for what will be in @data after this
- * function finishes:
- *
- * - CONFIG_CMDLINE_FORCE=true
- * CONFIG_CMDLINE
- * - CONFIG_CMDLINE_EXTEND=true, @data is non-empty string
- * @data + dt bootargs (even if dt bootargs are empty)
- * - CONFIG_CMDLINE_EXTEND=true, @data is empty string
- * CONFIG_CMDLINE + dt bootargs (even if dt bootargs are empty)
- * - CMDLINE_FROM_BOOTLOADER=true, dt bootargs=non-empty:
- * dt bootargs
- * - CMDLINE_FROM_BOOTLOADER=true, dt bootargs=empty, @data is non-empty string
- * @data is left unchanged
- * - CMDLINE_FROM_BOOTLOADER=true, dt bootargs=empty, @data is empty string
- * CONFIG_CMDLINE (or "" if that's not defined)
- */
- 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 *params);
- extern bool early_init_dt_verify(void *params);
- 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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