108 lines
3.9 KiB
C
108 lines
3.9 KiB
C
/*
|
|
* Definitions for working with the Flattened Device Tree data format
|
|
*
|
|
* Copyright 2009 Benjamin Herrenschmidt, IBM Corp
|
|
* benh@kernel.crashing.org
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* version 2 as published by the Free Software Foundation.
|
|
*/
|
|
|
|
#ifndef _LINUX_OF_FDT_H
|
|
#define _LINUX_OF_FDT_H
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/init.h>
|
|
|
|
/* Definitions used by the flattened device tree */
|
|
#define OF_DT_HEADER 0xd00dfeed /* marker */
|
|
#define OF_DT_BEGIN_NODE 0x1 /* Start of node, full name */
|
|
#define OF_DT_END_NODE 0x2 /* End node */
|
|
#define OF_DT_PROP 0x3 /* Property: name off, size,
|
|
* content */
|
|
#define OF_DT_NOP 0x4 /* nop */
|
|
#define OF_DT_END 0x9
|
|
|
|
#define OF_DT_VERSION 0x10
|
|
|
|
#ifndef __ASSEMBLY__
|
|
/*
|
|
* This is what gets passed to the kernel by prom_init or kexec
|
|
*
|
|
* The dt struct contains the device tree structure, full pathes and
|
|
* property contents. The dt strings contain a separate block with just
|
|
* the strings for the property names, and is fully page aligned and
|
|
* self contained in a page, so that it can be kept around by the kernel,
|
|
* each property name appears only once in this page (cheap compression)
|
|
*
|
|
* the mem_rsvmap contains a map of reserved ranges of physical memory,
|
|
* passing it here instead of in the device-tree itself greatly simplifies
|
|
* the job of everybody. It's just a list of u64 pairs (base/size) that
|
|
* ends when size is 0
|
|
*/
|
|
struct boot_param_header {
|
|
__be32 magic; /* magic word OF_DT_HEADER */
|
|
__be32 totalsize; /* total size of DT block */
|
|
__be32 off_dt_struct; /* offset to structure */
|
|
__be32 off_dt_strings; /* offset to strings */
|
|
__be32 off_mem_rsvmap; /* offset to memory reserve map */
|
|
__be32 version; /* format version */
|
|
__be32 last_comp_version; /* last compatible version */
|
|
/* version 2 fields below */
|
|
__be32 boot_cpuid_phys; /* Physical CPU id we're booting on */
|
|
/* version 3 fields below */
|
|
__be32 dt_strings_size; /* size of the DT strings block */
|
|
/* version 17 fields below */
|
|
__be32 dt_struct_size; /* size of the DT structure block */
|
|
};
|
|
|
|
#if defined(CONFIG_OF_FLATTREE)
|
|
/* 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 struct boot_param_header *initial_boot_params;
|
|
|
|
/* For scanning the flat device-tree at boot time */
|
|
extern char *find_flat_dt_string(u32 offset);
|
|
extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname,
|
|
int depth, void *data),
|
|
void *data);
|
|
extern void *of_get_flat_dt_prop(unsigned long node, const char *name,
|
|
unsigned long *size);
|
|
extern int of_flat_dt_is_compatible(unsigned long node, const char *name);
|
|
extern unsigned long of_get_flat_dt_root(void);
|
|
|
|
extern int early_init_dt_scan_chosen(unsigned long node, const char *uname,
|
|
int depth, void *data);
|
|
extern void early_init_dt_check_for_initrd(unsigned long node);
|
|
extern int early_init_dt_scan_memory(unsigned long node, const char *uname,
|
|
int depth, void *data);
|
|
extern void early_init_dt_add_memory_arch(u64 base, u64 size);
|
|
extern u64 early_init_dt_alloc_memory_arch(u64 size, u64 align);
|
|
extern u64 dt_mem_next_cell(int s, __be32 **cellp);
|
|
|
|
/*
|
|
* If BLK_DEV_INITRD, the fdt early init code will call this function,
|
|
* to be provided by the arch code. start and end are specified as
|
|
* physical addresses.
|
|
*/
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
extern void early_init_dt_setup_initrd_arch(unsigned long start,
|
|
unsigned long end);
|
|
#endif
|
|
|
|
/* Early flat tree scan hooks */
|
|
extern int early_init_dt_scan_root(unsigned long node, const char *uname,
|
|
int depth, void *data);
|
|
|
|
/* Other Prototypes */
|
|
extern void unflatten_device_tree(void);
|
|
extern void early_init_devtree(void *);
|
|
#else /* CONFIG_OF_FLATTREE */
|
|
static inline void unflatten_device_tree(void) {}
|
|
#endif /* CONFIG_OF_FLATTREE */
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
#endif /* _LINUX_OF_FDT_H */
|