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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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8bfe9b5c3a
This patch makes unflatten_device_tree() safe to call from any arch setup code with the following changes: - Make sure initial_boot_params actually points to a device tree blob before unflattening - Make sure the initial_boot_params->magic field is correct - If CONFIG_OF_FLATTREE is not set, then make unflatten_device_tree() an empty static inline function. This patch also adds some additional debug output to the top of unflatten_device_tree(). Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
108 lines
4.0 KiB
C
108 lines
4.0 KiB
C
/*
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* Definitions for working with the Flattened Device Tree data format
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*
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* Copyright 2009 Benjamin Herrenschmidt, IBM Corp
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* benh@kernel.crashing.org
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*/
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#ifndef _LINUX_OF_FDT_H
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#define _LINUX_OF_FDT_H
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#include <linux/types.h>
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#include <linux/init.h>
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/* Definitions used by the flattened device tree */
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#define OF_DT_HEADER 0xd00dfeed /* marker */
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#define OF_DT_BEGIN_NODE 0x1 /* Start of node, full name */
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#define OF_DT_END_NODE 0x2 /* End node */
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#define OF_DT_PROP 0x3 /* Property: name off, size,
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* content */
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#define OF_DT_NOP 0x4 /* nop */
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#define OF_DT_END 0x9
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#define OF_DT_VERSION 0x10
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#ifndef __ASSEMBLY__
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/*
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* This is what gets passed to the kernel by prom_init or kexec
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*
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* The dt struct contains the device tree structure, full pathes and
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* property contents. The dt strings contain a separate block with just
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* the strings for the property names, and is fully page aligned and
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* self contained in a page, so that it can be kept around by the kernel,
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* each property name appears only once in this page (cheap compression)
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*
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* the mem_rsvmap contains a map of reserved ranges of physical memory,
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* passing it here instead of in the device-tree itself greatly simplifies
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* the job of everybody. It's just a list of u64 pairs (base/size) that
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* ends when size is 0
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*/
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struct boot_param_header {
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__be32 magic; /* magic word OF_DT_HEADER */
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__be32 totalsize; /* total size of DT block */
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__be32 off_dt_struct; /* offset to structure */
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__be32 off_dt_strings; /* offset to strings */
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__be32 off_mem_rsvmap; /* offset to memory reserve map */
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__be32 version; /* format version */
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__be32 last_comp_version; /* last compatible version */
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/* version 2 fields below */
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__be32 boot_cpuid_phys; /* Physical CPU id we're booting on */
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/* version 3 fields below */
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__be32 dt_strings_size; /* size of the DT strings block */
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/* version 17 fields below */
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__be32 dt_struct_size; /* size of the DT structure block */
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};
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#if defined(CONFIG_OF_FLATTREE)
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/* TBD: Temporary export of fdt globals - remove when code fully merged */
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extern int __initdata dt_root_addr_cells;
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extern int __initdata dt_root_size_cells;
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extern struct boot_param_header *initial_boot_params;
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/* For scanning the flat device-tree at boot time */
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extern char *find_flat_dt_string(u32 offset);
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extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname,
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int depth, void *data),
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void *data);
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extern void *of_get_flat_dt_prop(unsigned long node, const char *name,
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unsigned long *size);
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extern int of_flat_dt_is_compatible(unsigned long node, const char *name);
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extern unsigned long of_get_flat_dt_root(void);
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extern void early_init_dt_scan_chosen_arch(unsigned long node);
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extern int early_init_dt_scan_chosen(unsigned long node, const char *uname,
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int depth, void *data);
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extern void early_init_dt_check_for_initrd(unsigned long node);
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extern int early_init_dt_scan_memory(unsigned long node, const char *uname,
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int depth, void *data);
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extern void early_init_dt_add_memory_arch(u64 base, u64 size);
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extern u64 early_init_dt_alloc_memory_arch(u64 size, u64 align);
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extern u64 dt_mem_next_cell(int s, __be32 **cellp);
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/*
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* If BLK_DEV_INITRD, the fdt early init code will call this function,
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* to be provided by the arch code. start and end are specified as
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* physical addresses.
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*/
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#ifdef CONFIG_BLK_DEV_INITRD
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extern void early_init_dt_setup_initrd_arch(unsigned long start,
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unsigned long end);
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#endif
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/* Early flat tree scan hooks */
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extern int early_init_dt_scan_root(unsigned long node, const char *uname,
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int depth, void *data);
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/* Other Prototypes */
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extern void unflatten_device_tree(void);
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extern void early_init_devtree(void *);
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#else /* CONFIG_OF_FLATTREE */
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static inline void unflatten_device_tree(void) {}
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#endif /* CONFIG_OF_FLATTREE */
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#endif /* __ASSEMBLY__ */
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#endif /* _LINUX_OF_FDT_H */
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