lib/binman.c

   1 // SPDX-License-Identifier: Intel
   2 /*
   3  * Access to binman information at runtime
   4  *
   5  * Copyright 2019 Google LLC
   6  * Written by Simon Glass <sjg@chromium.org>
   7  */
   8
   9 #include <common.h>
  10 #include <binman.h>
  11 #include <dm.h>
  12 #include <log.h>
  13 #include <malloc.h>
  14 #include <mapmem.h>
  15
  16 /**
  17  * struct binman_info - Information needed by the binman library
  18  *
  19  * @image: Node describing the image we are running from
  20  * @rom_offset: Offset from an image_pos to the memory-mapped address, or
  21  *      ROM_OFFSET_NONE if the ROM is not memory-mapped. Can be positive or
  22  *      negative
  23  */
  24 struct binman_info {
  25         ofnode image;
  26         int rom_offset;
  27 };
  28
  29 #define ROM_OFFSET_NONE         (-1)
  30
  31 static struct binman_info *binman;
  32
  33 static int binman_entry_find_internal(ofnode node, const char *name,
  34                                       struct binman_entry *entry)
  35 {
  36         int ret;
  37
  38         if (!ofnode_valid(node))
  39                 node = binman->image;
  40         node = ofnode_find_subnode(node, name);
  41         if (!ofnode_valid(node))
  42                 return log_msg_ret("node", -ENOENT);
  43
  44         ret = ofnode_read_u32(node, "image-pos", &entry->image_pos);
  45         if (ret)
  46                 return log_msg_ret("import-pos", ret);
  47         ret = ofnode_read_u32(node, "size", &entry->size);
  48         if (ret)
  49                 return log_msg_ret("size", ret);
  50
  51         return 0;
  52 }
  53
  54 int binman_entry_find(const char *name, struct binman_entry *entry)
  55 {
  56         return binman_entry_find_internal(binman->image, name, entry);
  57 }
  58
  59 int binman_entry_map(ofnode parent, const char *name, void **bufp, int *sizep)
  60 {
  61         struct binman_entry entry;
  62         int ret;
  63
  64         if (binman->rom_offset == ROM_OFFSET_NONE)
  65                 return -EPERM;
  66         ret = binman_entry_find_internal(parent, name, &entry);
  67         if (ret)
  68                 return log_msg_ret("entry", ret);
  69         if (sizep)
  70                 *sizep = entry.size;
  71         *bufp = map_sysmem(entry.image_pos + binman->rom_offset, entry.size);
  72
  73         return 0;
  74 }
  75
  76 ofnode binman_section_find_node(const char *name)
  77 {
  78         return ofnode_find_subnode(binman->image, name);
  79 }
  80
  81 void binman_set_rom_offset(int rom_offset)
  82 {
  83         binman->rom_offset = rom_offset;
  84 }
  85
  86 int binman_init(void)
  87 {
  88         binman = malloc(sizeof(struct binman_info));
  89         if (!binman)
  90                 return log_msg_ret("space for binman", -ENOMEM);
  91         binman->image = ofnode_path("/binman");
  92         if (!ofnode_valid(binman->image))
  93                 return log_msg_ret("binman node", -EINVAL);
  94         binman->rom_offset = ROM_OFFSET_NONE;
  95
  96         return 0;
  97 }