arch/powerpc/boot/flatdevtree.h

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  15  */
  16
  17 #ifndef FLATDEVTREE_H
  18 #define FLATDEVTREE_H
  19
  20 #include "flatdevtree_env.h"
  21
  22 /* Definitions used by the flattened device tree */
  23 #define OF_DT_HEADER            0xd00dfeed      /* marker */
  24 #define OF_DT_BEGIN_NODE        0x1     /* Start of node, full name */
  25 #define OF_DT_END_NODE          0x2     /* End node */
  26 #define OF_DT_PROP              0x3     /* Property: name off, size, content */
  27 #define OF_DT_NOP               0x4     /* nop */
  28 #define OF_DT_END               0x9
  29
  30 #define OF_DT_VERSION           0x10
  31
  32 struct boot_param_header {
  33         u32 magic;              /* magic word OF_DT_HEADER */
  34         u32 totalsize;          /* total size of DT block */
  35         u32 off_dt_struct;      /* offset to structure */
  36         u32 off_dt_strings;     /* offset to strings */
  37         u32 off_mem_rsvmap;     /* offset to memory reserve map */
  38         u32 version;            /* format version */
  39         u32 last_comp_version;  /* last compatible version */
  40         /* version 2 fields below */
  41         u32 boot_cpuid_phys;    /* Physical CPU id we're booting on */
  42         /* version 3 fields below */
  43         u32 dt_strings_size;    /* size of the DT strings block */
  44 };
  45
  46 struct ft_reserve {
  47         u64 start;
  48         u64 len;
  49 };
  50
  51 struct ft_region {
  52         char *start;
  53         unsigned long size;
  54 };
  55
  56 enum ft_rgn_id {
  57         FT_RSVMAP,
  58         FT_STRUCT,
  59         FT_STRINGS,
  60         FT_N_REGION
  61 };
  62
  63 #define FT_MAX_DEPTH    50
  64
  65 struct ft_cxt {
  66         struct boot_param_header *bph;
  67         int max_size;           /* maximum size of tree */
  68         int isordered;          /* everything in standard order */
  69         void *(*realloc)(void *, unsigned long);
  70         char *str_anchor;
  71         char *p;                /* current insertion point in structs */
  72         struct ft_region rgn[FT_N_REGION];
  73         void *genealogy[FT_MAX_DEPTH+1];
  74         char **node_tbl;
  75         unsigned int node_max;
  76         unsigned int nodes_used;
  77 };
  78
  79 char *ft_begin_node(struct ft_cxt *cxt, const char *name);
  80 void ft_end_node(struct ft_cxt *cxt);
  81
  82 void ft_begin_tree(struct ft_cxt *cxt);
  83 void ft_end_tree(struct ft_cxt *cxt);
  84
  85 void ft_nop(struct ft_cxt *cxt);
  86 int ft_prop(struct ft_cxt *cxt, const char *name,
  87             const void *data, unsigned int sz);
  88 int ft_prop_str(struct ft_cxt *cxt, const char *name, const char *str);
  89 int ft_prop_int(struct ft_cxt *cxt, const char *name, unsigned int val);
  90 void ft_begin(struct ft_cxt *cxt, void *blob, unsigned int max_size,
  91               void *(*realloc_fn)(void *, unsigned long));
  92 int ft_open(struct ft_cxt *cxt, void *blob, unsigned int max_size,
  93                 unsigned int max_find_device,
  94                 void *(*realloc_fn)(void *, unsigned long));
  95 int ft_add_rsvmap(struct ft_cxt *cxt, u64 physaddr, u64 size);
  96
  97 void ft_dump_blob(const void *bphp);
  98 void ft_merge_blob(struct ft_cxt *cxt, void *blob);
  99 void *ft_find_device(struct ft_cxt *cxt, const void *top,
 100                      const char *srch_path);
 101 void *ft_find_descendent(struct ft_cxt *cxt, void *top, const char *srch_path);
 102 int ft_get_prop(struct ft_cxt *cxt, const void *phandle, const char *propname,
 103                 void *buf, const unsigned int buflen);
 104 int ft_set_prop(struct ft_cxt *cxt, const void *phandle, const char *propname,
 105                 const void *buf, const unsigned int buflen);
 106 void *ft_get_parent(struct ft_cxt *cxt, const void *phandle);
 107 void *ft_find_node_by_prop_value(struct ft_cxt *cxt, const void *prev,
 108                                  const char *propname, const char *propval,
 109                                  int proplen);
 110 void *ft_create_node(struct ft_cxt *cxt, const void *parent, const char *name);
 111 char *ft_get_path(struct ft_cxt *cxt, const void *phandle, char *buf, int len);
 112
 113 #endif /* FLATDEVTREE_H */