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Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
152 lines
3.4 KiB
C
152 lines
3.4 KiB
C
// SPDX-License-Identifier: Intel
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/*
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* Access to binman information at runtime
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*
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* Copyright 2019 Google LLC
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#include <common.h>
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#include <binman.h>
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#include <dm.h>
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#include <log.h>
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#include <malloc.h>
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#include <mapmem.h>
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/**
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* struct binman_info - Information needed by the binman library
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*
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* @image: Node describing the image we are running from
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* @rom_offset: Offset from an image_pos to the memory-mapped address, or
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* ROM_OFFSET_NONE if the ROM is not memory-mapped. Can be positive or
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* negative
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*/
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struct binman_info {
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ofnode image;
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int rom_offset;
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};
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#define ROM_OFFSET_NONE (-1)
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static struct binman_info *binman;
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/**
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* find_image_node() - Find the top-level binman node
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*
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* Finds the binman node which can be used to load entries. The correct node
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* depends on whether multiple-images is in use.
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*
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* @nodep: Returns the node found, on success
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* Return: 0 if OK, , -EINVAL if there is no /binman node, -ECHILD if multiple
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* images are being used but the first image is not available
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*/
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static int find_image_node(ofnode *nodep)
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{
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ofnode node;
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node = ofnode_path("/binman");
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if (!ofnode_valid(node))
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return log_msg_ret("binman node", -EINVAL);
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if (ofnode_read_bool(node, "multiple-images")) {
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node = ofnode_first_subnode(node);
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if (!ofnode_valid(node))
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return log_msg_ret("first image", -ECHILD);
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}
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*nodep = node;
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return 0;
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}
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static int binman_entry_find_internal(ofnode node, const char *name,
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struct binman_entry *entry)
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{
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int ret;
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if (!ofnode_valid(node))
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node = binman->image;
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node = ofnode_find_subnode(node, name);
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if (!ofnode_valid(node))
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return log_msg_ret("node", -ENOENT);
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ret = ofnode_read_u32(node, "image-pos", &entry->image_pos);
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if (ret)
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return log_msg_ret("image-pos", ret);
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ret = ofnode_read_u32(node, "size", &entry->size);
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if (ret)
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return log_msg_ret("size", ret);
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return 0;
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}
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int binman_entry_find(const char *name, struct binman_entry *entry)
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{
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return binman_entry_find_internal(binman->image, name, entry);
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}
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int binman_entry_map(ofnode parent, const char *name, void **bufp, int *sizep)
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{
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struct binman_entry entry;
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int ret;
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if (binman->rom_offset == ROM_OFFSET_NONE)
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return -EPERM;
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ret = binman_entry_find_internal(parent, name, &entry);
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if (ret)
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return log_msg_ret("entry", ret);
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if (sizep)
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*sizep = entry.size;
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*bufp = map_sysmem(entry.image_pos + binman->rom_offset, entry.size);
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return 0;
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}
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ofnode binman_section_find_node(const char *name)
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{
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return ofnode_find_subnode(binman->image, name);
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}
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void binman_set_rom_offset(int rom_offset)
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{
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binman->rom_offset = rom_offset;
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}
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int binman_get_rom_offset(void)
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{
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return binman->rom_offset;
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}
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int binman_select_subnode(const char *name)
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{
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ofnode node;
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int ret;
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ret = find_image_node(&node);
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if (ret)
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return log_msg_ret("main", -ENOENT);
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node = ofnode_find_subnode(node, name);
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if (!ofnode_valid(node))
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return log_msg_ret("node", -ENOENT);
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binman->image = node;
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log_info("binman: Selected image subnode '%s'\n",
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ofnode_get_name(binman->image));
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return 0;
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}
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int binman_init(void)
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{
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int ret;
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binman = malloc(sizeof(struct binman_info));
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if (!binman)
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return log_msg_ret("space for binman", -ENOMEM);
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ret = find_image_node(&binman->image);
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if (ret)
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return log_msg_ret("node", -ENOENT);
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binman_set_rom_offset(ROM_OFFSET_NONE);
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log_debug("binman: Selected image node '%s'\n",
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ofnode_get_name(binman->image));
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return 0;
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}
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