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a2a9d67a26
This allows kernel developer to embed a default bootconfig file in the kernel instead of embedding it in the initrd. This will be good for who are using the kernel without initrd, or who needs a default bootconfigs. This needs to set two kconfigs: CONFIG_BOOT_CONFIG_EMBED=y and set the file path to CONFIG_BOOT_CONFIG_EMBED_FILE. Note that you still need 'bootconfig' command line option to load the embedded bootconfig. Also if you boot using an initrd with a different bootconfig, the kernel will use the bootconfig in the initrd, instead of the default bootconfig. Link: https://lkml.kernel.org/r/164921227943.1090670.14035119557571329218.stgit@devnote2 Cc: Padmanabha Srinivasaiah <treasure4paddy@gmail.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Nick Desaulniers <ndesaulniers@google.com> Cc: Sami Tolvanen <samitolvanen@google.com> Cc: Nathan Chancellor <nathan@kernel.org> Cc: Masahiro Yamada <masahiroy@kernel.org> Cc: Linux Kbuild mailing list <linux-kbuild@vger.kernel.org> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
986 lines
22 KiB
C
986 lines
22 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Extra Boot Config
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* Masami Hiramatsu <mhiramat@kernel.org>
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*/
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#ifdef __KERNEL__
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#include <linux/bootconfig.h>
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#include <linux/bug.h>
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#include <linux/ctype.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/memblock.h>
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#include <linux/string.h>
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#ifdef CONFIG_BOOT_CONFIG_EMBED
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/* embedded_bootconfig_data is defined in bootconfig-data.S */
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extern __visible const char embedded_bootconfig_data[];
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extern __visible const char embedded_bootconfig_data_end[];
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const char * __init xbc_get_embedded_bootconfig(size_t *size)
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{
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*size = embedded_bootconfig_data_end - embedded_bootconfig_data;
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return (*size) ? embedded_bootconfig_data : NULL;
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}
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#endif
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#else /* !__KERNEL__ */
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/*
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* NOTE: This is only for tools/bootconfig, because tools/bootconfig will
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* run the parser sanity test.
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* This does NOT mean lib/bootconfig.c is available in the user space.
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* However, if you change this file, please make sure the tools/bootconfig
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* has no issue on building and running.
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*/
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#include <linux/bootconfig.h>
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#endif
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/*
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* Extra Boot Config (XBC) is given as tree-structured ascii text of
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* key-value pairs on memory.
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* xbc_parse() parses the text to build a simple tree. Each tree node is
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* simply a key word or a value. A key node may have a next key node or/and
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* a child node (both key and value). A value node may have a next value
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* node (for array).
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*/
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static struct xbc_node *xbc_nodes __initdata;
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static int xbc_node_num __initdata;
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static char *xbc_data __initdata;
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static size_t xbc_data_size __initdata;
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static struct xbc_node *last_parent __initdata;
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static const char *xbc_err_msg __initdata;
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static int xbc_err_pos __initdata;
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static int open_brace[XBC_DEPTH_MAX] __initdata;
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static int brace_index __initdata;
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#ifdef __KERNEL__
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static inline void * __init xbc_alloc_mem(size_t size)
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{
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return memblock_alloc(size, SMP_CACHE_BYTES);
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}
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static inline void __init xbc_free_mem(void *addr, size_t size)
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{
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memblock_free(addr, size);
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}
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#else /* !__KERNEL__ */
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static inline void *xbc_alloc_mem(size_t size)
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{
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return malloc(size);
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}
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static inline void xbc_free_mem(void *addr, size_t size)
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{
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free(addr);
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}
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#endif
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/**
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* xbc_get_info() - Get the information of loaded boot config
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* @node_size: A pointer to store the number of nodes.
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* @data_size: A pointer to store the size of bootconfig data.
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*
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* Get the number of used nodes in @node_size if it is not NULL,
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* and the size of bootconfig data in @data_size if it is not NULL.
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* Return 0 if the boot config is initialized, or return -ENODEV.
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*/
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int __init xbc_get_info(int *node_size, size_t *data_size)
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{
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if (!xbc_data)
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return -ENODEV;
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if (node_size)
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*node_size = xbc_node_num;
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if (data_size)
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*data_size = xbc_data_size;
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return 0;
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}
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static int __init xbc_parse_error(const char *msg, const char *p)
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{
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xbc_err_msg = msg;
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xbc_err_pos = (int)(p - xbc_data);
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return -EINVAL;
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}
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/**
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* xbc_root_node() - Get the root node of extended boot config
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*
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* Return the address of root node of extended boot config. If the
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* extended boot config is not initiized, return NULL.
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*/
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struct xbc_node * __init xbc_root_node(void)
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{
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if (unlikely(!xbc_data))
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return NULL;
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return xbc_nodes;
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}
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/**
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* xbc_node_index() - Get the index of XBC node
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* @node: A target node of getting index.
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*
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* Return the index number of @node in XBC node list.
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*/
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int __init xbc_node_index(struct xbc_node *node)
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{
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return node - &xbc_nodes[0];
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}
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/**
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* xbc_node_get_parent() - Get the parent XBC node
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* @node: An XBC node.
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*
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* Return the parent node of @node. If the node is top node of the tree,
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* return NULL.
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*/
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struct xbc_node * __init xbc_node_get_parent(struct xbc_node *node)
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{
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return node->parent == XBC_NODE_MAX ? NULL : &xbc_nodes[node->parent];
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}
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/**
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* xbc_node_get_child() - Get the child XBC node
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* @node: An XBC node.
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*
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* Return the first child node of @node. If the node has no child, return
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* NULL.
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*/
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struct xbc_node * __init xbc_node_get_child(struct xbc_node *node)
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{
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return node->child ? &xbc_nodes[node->child] : NULL;
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}
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/**
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* xbc_node_get_next() - Get the next sibling XBC node
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* @node: An XBC node.
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*
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* Return the NEXT sibling node of @node. If the node has no next sibling,
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* return NULL. Note that even if this returns NULL, it doesn't mean @node
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* has no siblings. (You also has to check whether the parent's child node
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* is @node or not.)
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*/
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struct xbc_node * __init xbc_node_get_next(struct xbc_node *node)
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{
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return node->next ? &xbc_nodes[node->next] : NULL;
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}
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/**
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* xbc_node_get_data() - Get the data of XBC node
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* @node: An XBC node.
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*
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* Return the data (which is always a null terminated string) of @node.
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* If the node has invalid data, warn and return NULL.
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*/
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const char * __init xbc_node_get_data(struct xbc_node *node)
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{
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int offset = node->data & ~XBC_VALUE;
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if (WARN_ON(offset >= xbc_data_size))
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return NULL;
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return xbc_data + offset;
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}
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static bool __init
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xbc_node_match_prefix(struct xbc_node *node, const char **prefix)
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{
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const char *p = xbc_node_get_data(node);
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int len = strlen(p);
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if (strncmp(*prefix, p, len))
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return false;
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p = *prefix + len;
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if (*p == '.')
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p++;
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else if (*p != '\0')
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return false;
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*prefix = p;
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return true;
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}
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/**
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* xbc_node_find_subkey() - Find a subkey node which matches given key
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* @parent: An XBC node.
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* @key: A key string.
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*
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* Search a key node under @parent which matches @key. The @key can contain
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* several words jointed with '.'. If @parent is NULL, this searches the
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* node from whole tree. Return NULL if no node is matched.
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*/
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struct xbc_node * __init
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xbc_node_find_subkey(struct xbc_node *parent, const char *key)
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{
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struct xbc_node *node;
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if (parent)
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node = xbc_node_get_subkey(parent);
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else
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node = xbc_root_node();
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while (node && xbc_node_is_key(node)) {
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if (!xbc_node_match_prefix(node, &key))
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node = xbc_node_get_next(node);
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else if (*key != '\0')
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node = xbc_node_get_subkey(node);
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else
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break;
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}
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return node;
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}
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/**
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* xbc_node_find_value() - Find a value node which matches given key
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* @parent: An XBC node.
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* @key: A key string.
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* @vnode: A container pointer of found XBC node.
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*
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* Search a value node under @parent whose (parent) key node matches @key,
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* store it in *@vnode, and returns the value string.
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* The @key can contain several words jointed with '.'. If @parent is NULL,
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* this searches the node from whole tree. Return the value string if a
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* matched key found, return NULL if no node is matched.
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* Note that this returns 0-length string and stores NULL in *@vnode if the
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* key has no value. And also it will return the value of the first entry if
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* the value is an array.
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*/
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const char * __init
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xbc_node_find_value(struct xbc_node *parent, const char *key,
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struct xbc_node **vnode)
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{
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struct xbc_node *node = xbc_node_find_subkey(parent, key);
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if (!node || !xbc_node_is_key(node))
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return NULL;
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node = xbc_node_get_child(node);
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if (node && !xbc_node_is_value(node))
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return NULL;
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if (vnode)
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*vnode = node;
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return node ? xbc_node_get_data(node) : "";
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}
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/**
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* xbc_node_compose_key_after() - Compose partial key string of the XBC node
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* @root: Root XBC node
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* @node: Target XBC node.
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* @buf: A buffer to store the key.
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* @size: The size of the @buf.
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*
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* Compose the partial key of the @node into @buf, which is starting right
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* after @root (@root is not included.) If @root is NULL, this returns full
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* key words of @node.
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* Returns the total length of the key stored in @buf. Returns -EINVAL
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* if @node is NULL or @root is not the ancestor of @node or @root is @node,
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* or returns -ERANGE if the key depth is deeper than max depth.
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* This is expected to be used with xbc_find_node() to list up all (child)
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* keys under given key.
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*/
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int __init xbc_node_compose_key_after(struct xbc_node *root,
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struct xbc_node *node,
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char *buf, size_t size)
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{
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uint16_t keys[XBC_DEPTH_MAX];
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int depth = 0, ret = 0, total = 0;
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if (!node || node == root)
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return -EINVAL;
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if (xbc_node_is_value(node))
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node = xbc_node_get_parent(node);
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while (node && node != root) {
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keys[depth++] = xbc_node_index(node);
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if (depth == XBC_DEPTH_MAX)
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return -ERANGE;
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node = xbc_node_get_parent(node);
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}
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if (!node && root)
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return -EINVAL;
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while (--depth >= 0) {
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node = xbc_nodes + keys[depth];
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ret = snprintf(buf, size, "%s%s", xbc_node_get_data(node),
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depth ? "." : "");
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if (ret < 0)
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return ret;
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if (ret > size) {
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size = 0;
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} else {
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size -= ret;
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buf += ret;
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}
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total += ret;
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}
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return total;
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}
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/**
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* xbc_node_find_next_leaf() - Find the next leaf node under given node
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* @root: An XBC root node
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* @node: An XBC node which starts from.
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*
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* Search the next leaf node (which means the terminal key node) of @node
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* under @root node (including @root node itself).
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* Return the next node or NULL if next leaf node is not found.
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*/
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struct xbc_node * __init xbc_node_find_next_leaf(struct xbc_node *root,
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struct xbc_node *node)
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{
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struct xbc_node *next;
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if (unlikely(!xbc_data))
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return NULL;
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if (!node) { /* First try */
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node = root;
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if (!node)
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node = xbc_nodes;
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} else {
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/* Leaf node may have a subkey */
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next = xbc_node_get_subkey(node);
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if (next) {
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node = next;
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goto found;
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}
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if (node == root) /* @root was a leaf, no child node. */
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return NULL;
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while (!node->next) {
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node = xbc_node_get_parent(node);
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if (node == root)
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return NULL;
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/* User passed a node which is not uder parent */
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if (WARN_ON(!node))
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return NULL;
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}
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node = xbc_node_get_next(node);
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}
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found:
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while (node && !xbc_node_is_leaf(node))
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node = xbc_node_get_child(node);
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return node;
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}
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/**
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* xbc_node_find_next_key_value() - Find the next key-value pair nodes
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* @root: An XBC root node
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* @leaf: A container pointer of XBC node which starts from.
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*
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* Search the next leaf node (which means the terminal key node) of *@leaf
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* under @root node. Returns the value and update *@leaf if next leaf node
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* is found, or NULL if no next leaf node is found.
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* Note that this returns 0-length string if the key has no value, or
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* the value of the first entry if the value is an array.
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*/
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const char * __init xbc_node_find_next_key_value(struct xbc_node *root,
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struct xbc_node **leaf)
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{
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/* tip must be passed */
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if (WARN_ON(!leaf))
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return NULL;
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*leaf = xbc_node_find_next_leaf(root, *leaf);
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if (!*leaf)
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return NULL;
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if ((*leaf)->child)
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return xbc_node_get_data(xbc_node_get_child(*leaf));
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else
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return ""; /* No value key */
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}
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/* XBC parse and tree build */
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static int __init xbc_init_node(struct xbc_node *node, char *data, uint32_t flag)
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{
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unsigned long offset = data - xbc_data;
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if (WARN_ON(offset >= XBC_DATA_MAX))
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return -EINVAL;
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node->data = (uint16_t)offset | flag;
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node->child = 0;
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node->next = 0;
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return 0;
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}
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static struct xbc_node * __init xbc_add_node(char *data, uint32_t flag)
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{
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struct xbc_node *node;
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if (xbc_node_num == XBC_NODE_MAX)
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return NULL;
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node = &xbc_nodes[xbc_node_num++];
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if (xbc_init_node(node, data, flag) < 0)
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return NULL;
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return node;
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}
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static inline __init struct xbc_node *xbc_last_sibling(struct xbc_node *node)
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{
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while (node->next)
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node = xbc_node_get_next(node);
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return node;
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}
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static inline __init struct xbc_node *xbc_last_child(struct xbc_node *node)
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{
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while (node->child)
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node = xbc_node_get_child(node);
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return node;
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}
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static struct xbc_node * __init __xbc_add_sibling(char *data, uint32_t flag, bool head)
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{
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struct xbc_node *sib, *node = xbc_add_node(data, flag);
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if (node) {
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if (!last_parent) {
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/* Ignore @head in this case */
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node->parent = XBC_NODE_MAX;
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sib = xbc_last_sibling(xbc_nodes);
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sib->next = xbc_node_index(node);
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} else {
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node->parent = xbc_node_index(last_parent);
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if (!last_parent->child || head) {
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node->next = last_parent->child;
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last_parent->child = xbc_node_index(node);
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} else {
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sib = xbc_node_get_child(last_parent);
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sib = xbc_last_sibling(sib);
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sib->next = xbc_node_index(node);
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}
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}
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} else
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xbc_parse_error("Too many nodes", data);
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return node;
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}
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static inline struct xbc_node * __init xbc_add_sibling(char *data, uint32_t flag)
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{
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return __xbc_add_sibling(data, flag, false);
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}
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static inline struct xbc_node * __init xbc_add_head_sibling(char *data, uint32_t flag)
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{
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return __xbc_add_sibling(data, flag, true);
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}
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static inline __init struct xbc_node *xbc_add_child(char *data, uint32_t flag)
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{
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struct xbc_node *node = xbc_add_sibling(data, flag);
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if (node)
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last_parent = node;
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return node;
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}
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|
|
static inline __init bool xbc_valid_keyword(char *key)
|
|
{
|
|
if (key[0] == '\0')
|
|
return false;
|
|
|
|
while (isalnum(*key) || *key == '-' || *key == '_')
|
|
key++;
|
|
|
|
return *key == '\0';
|
|
}
|
|
|
|
static char *skip_comment(char *p)
|
|
{
|
|
char *ret;
|
|
|
|
ret = strchr(p, '\n');
|
|
if (!ret)
|
|
ret = p + strlen(p);
|
|
else
|
|
ret++;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static char *skip_spaces_until_newline(char *p)
|
|
{
|
|
while (isspace(*p) && *p != '\n')
|
|
p++;
|
|
return p;
|
|
}
|
|
|
|
static int __init __xbc_open_brace(char *p)
|
|
{
|
|
/* Push the last key as open brace */
|
|
open_brace[brace_index++] = xbc_node_index(last_parent);
|
|
if (brace_index >= XBC_DEPTH_MAX)
|
|
return xbc_parse_error("Exceed max depth of braces", p);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init __xbc_close_brace(char *p)
|
|
{
|
|
brace_index--;
|
|
if (!last_parent || brace_index < 0 ||
|
|
(open_brace[brace_index] != xbc_node_index(last_parent)))
|
|
return xbc_parse_error("Unexpected closing brace", p);
|
|
|
|
if (brace_index == 0)
|
|
last_parent = NULL;
|
|
else
|
|
last_parent = &xbc_nodes[open_brace[brace_index - 1]];
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Return delimiter or error, no node added. As same as lib/cmdline.c,
|
|
* you can use " around spaces, but can't escape " for value.
|
|
*/
|
|
static int __init __xbc_parse_value(char **__v, char **__n)
|
|
{
|
|
char *p, *v = *__v;
|
|
int c, quotes = 0;
|
|
|
|
v = skip_spaces(v);
|
|
while (*v == '#') {
|
|
v = skip_comment(v);
|
|
v = skip_spaces(v);
|
|
}
|
|
if (*v == '"' || *v == '\'') {
|
|
quotes = *v;
|
|
v++;
|
|
}
|
|
p = v - 1;
|
|
while ((c = *++p)) {
|
|
if (!isprint(c) && !isspace(c))
|
|
return xbc_parse_error("Non printable value", p);
|
|
if (quotes) {
|
|
if (c != quotes)
|
|
continue;
|
|
quotes = 0;
|
|
*p++ = '\0';
|
|
p = skip_spaces_until_newline(p);
|
|
c = *p;
|
|
if (c && !strchr(",;\n#}", c))
|
|
return xbc_parse_error("No value delimiter", p);
|
|
if (*p)
|
|
p++;
|
|
break;
|
|
}
|
|
if (strchr(",;\n#}", c)) {
|
|
*p++ = '\0';
|
|
v = strim(v);
|
|
break;
|
|
}
|
|
}
|
|
if (quotes)
|
|
return xbc_parse_error("No closing quotes", p);
|
|
if (c == '#') {
|
|
p = skip_comment(p);
|
|
c = '\n'; /* A comment must be treated as a newline */
|
|
}
|
|
*__n = p;
|
|
*__v = v;
|
|
|
|
return c;
|
|
}
|
|
|
|
static int __init xbc_parse_array(char **__v)
|
|
{
|
|
struct xbc_node *node;
|
|
char *next;
|
|
int c = 0;
|
|
|
|
if (last_parent->child)
|
|
last_parent = xbc_node_get_child(last_parent);
|
|
|
|
do {
|
|
c = __xbc_parse_value(__v, &next);
|
|
if (c < 0)
|
|
return c;
|
|
|
|
node = xbc_add_child(*__v, XBC_VALUE);
|
|
if (!node)
|
|
return -ENOMEM;
|
|
*__v = next;
|
|
} while (c == ',');
|
|
node->child = 0;
|
|
|
|
return c;
|
|
}
|
|
|
|
static inline __init
|
|
struct xbc_node *find_match_node(struct xbc_node *node, char *k)
|
|
{
|
|
while (node) {
|
|
if (!strcmp(xbc_node_get_data(node), k))
|
|
break;
|
|
node = xbc_node_get_next(node);
|
|
}
|
|
return node;
|
|
}
|
|
|
|
static int __init __xbc_add_key(char *k)
|
|
{
|
|
struct xbc_node *node, *child;
|
|
|
|
if (!xbc_valid_keyword(k))
|
|
return xbc_parse_error("Invalid keyword", k);
|
|
|
|
if (unlikely(xbc_node_num == 0))
|
|
goto add_node;
|
|
|
|
if (!last_parent) /* the first level */
|
|
node = find_match_node(xbc_nodes, k);
|
|
else {
|
|
child = xbc_node_get_child(last_parent);
|
|
/* Since the value node is the first child, skip it. */
|
|
if (child && xbc_node_is_value(child))
|
|
child = xbc_node_get_next(child);
|
|
node = find_match_node(child, k);
|
|
}
|
|
|
|
if (node)
|
|
last_parent = node;
|
|
else {
|
|
add_node:
|
|
node = xbc_add_child(k, XBC_KEY);
|
|
if (!node)
|
|
return -ENOMEM;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int __init __xbc_parse_keys(char *k)
|
|
{
|
|
char *p;
|
|
int ret;
|
|
|
|
k = strim(k);
|
|
while ((p = strchr(k, '.'))) {
|
|
*p++ = '\0';
|
|
ret = __xbc_add_key(k);
|
|
if (ret)
|
|
return ret;
|
|
k = p;
|
|
}
|
|
|
|
return __xbc_add_key(k);
|
|
}
|
|
|
|
static int __init xbc_parse_kv(char **k, char *v, int op)
|
|
{
|
|
struct xbc_node *prev_parent = last_parent;
|
|
struct xbc_node *child;
|
|
char *next;
|
|
int c, ret;
|
|
|
|
ret = __xbc_parse_keys(*k);
|
|
if (ret)
|
|
return ret;
|
|
|
|
c = __xbc_parse_value(&v, &next);
|
|
if (c < 0)
|
|
return c;
|
|
|
|
child = xbc_node_get_child(last_parent);
|
|
if (child && xbc_node_is_value(child)) {
|
|
if (op == '=')
|
|
return xbc_parse_error("Value is redefined", v);
|
|
if (op == ':') {
|
|
unsigned short nidx = child->next;
|
|
|
|
xbc_init_node(child, v, XBC_VALUE);
|
|
child->next = nidx; /* keep subkeys */
|
|
goto array;
|
|
}
|
|
/* op must be '+' */
|
|
last_parent = xbc_last_child(child);
|
|
}
|
|
/* The value node should always be the first child */
|
|
if (!xbc_add_head_sibling(v, XBC_VALUE))
|
|
return -ENOMEM;
|
|
|
|
array:
|
|
if (c == ',') { /* Array */
|
|
c = xbc_parse_array(&next);
|
|
if (c < 0)
|
|
return c;
|
|
}
|
|
|
|
last_parent = prev_parent;
|
|
|
|
if (c == '}') {
|
|
ret = __xbc_close_brace(next - 1);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
*k = next;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init xbc_parse_key(char **k, char *n)
|
|
{
|
|
struct xbc_node *prev_parent = last_parent;
|
|
int ret;
|
|
|
|
*k = strim(*k);
|
|
if (**k != '\0') {
|
|
ret = __xbc_parse_keys(*k);
|
|
if (ret)
|
|
return ret;
|
|
last_parent = prev_parent;
|
|
}
|
|
*k = n;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init xbc_open_brace(char **k, char *n)
|
|
{
|
|
int ret;
|
|
|
|
ret = __xbc_parse_keys(*k);
|
|
if (ret)
|
|
return ret;
|
|
*k = n;
|
|
|
|
return __xbc_open_brace(n - 1);
|
|
}
|
|
|
|
static int __init xbc_close_brace(char **k, char *n)
|
|
{
|
|
int ret;
|
|
|
|
ret = xbc_parse_key(k, n);
|
|
if (ret)
|
|
return ret;
|
|
/* k is updated in xbc_parse_key() */
|
|
|
|
return __xbc_close_brace(n - 1);
|
|
}
|
|
|
|
static int __init xbc_verify_tree(void)
|
|
{
|
|
int i, depth, len, wlen;
|
|
struct xbc_node *n, *m;
|
|
|
|
/* Brace closing */
|
|
if (brace_index) {
|
|
n = &xbc_nodes[open_brace[brace_index]];
|
|
return xbc_parse_error("Brace is not closed",
|
|
xbc_node_get_data(n));
|
|
}
|
|
|
|
/* Empty tree */
|
|
if (xbc_node_num == 0) {
|
|
xbc_parse_error("Empty config", xbc_data);
|
|
return -ENOENT;
|
|
}
|
|
|
|
for (i = 0; i < xbc_node_num; i++) {
|
|
if (xbc_nodes[i].next > xbc_node_num) {
|
|
return xbc_parse_error("No closing brace",
|
|
xbc_node_get_data(xbc_nodes + i));
|
|
}
|
|
}
|
|
|
|
/* Key tree limitation check */
|
|
n = &xbc_nodes[0];
|
|
depth = 1;
|
|
len = 0;
|
|
|
|
while (n) {
|
|
wlen = strlen(xbc_node_get_data(n)) + 1;
|
|
len += wlen;
|
|
if (len > XBC_KEYLEN_MAX)
|
|
return xbc_parse_error("Too long key length",
|
|
xbc_node_get_data(n));
|
|
|
|
m = xbc_node_get_child(n);
|
|
if (m && xbc_node_is_key(m)) {
|
|
n = m;
|
|
depth++;
|
|
if (depth > XBC_DEPTH_MAX)
|
|
return xbc_parse_error("Too many key words",
|
|
xbc_node_get_data(n));
|
|
continue;
|
|
}
|
|
len -= wlen;
|
|
m = xbc_node_get_next(n);
|
|
while (!m) {
|
|
n = xbc_node_get_parent(n);
|
|
if (!n)
|
|
break;
|
|
len -= strlen(xbc_node_get_data(n)) + 1;
|
|
depth--;
|
|
m = xbc_node_get_next(n);
|
|
}
|
|
n = m;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Need to setup xbc_data and xbc_nodes before call this. */
|
|
static int __init xbc_parse_tree(void)
|
|
{
|
|
char *p, *q;
|
|
int ret = 0, c;
|
|
|
|
last_parent = NULL;
|
|
p = xbc_data;
|
|
do {
|
|
q = strpbrk(p, "{}=+;:\n#");
|
|
if (!q) {
|
|
p = skip_spaces(p);
|
|
if (*p != '\0')
|
|
ret = xbc_parse_error("No delimiter", p);
|
|
break;
|
|
}
|
|
|
|
c = *q;
|
|
*q++ = '\0';
|
|
switch (c) {
|
|
case ':':
|
|
case '+':
|
|
if (*q++ != '=') {
|
|
ret = xbc_parse_error(c == '+' ?
|
|
"Wrong '+' operator" :
|
|
"Wrong ':' operator",
|
|
q - 2);
|
|
break;
|
|
}
|
|
fallthrough;
|
|
case '=':
|
|
ret = xbc_parse_kv(&p, q, c);
|
|
break;
|
|
case '{':
|
|
ret = xbc_open_brace(&p, q);
|
|
break;
|
|
case '#':
|
|
q = skip_comment(q);
|
|
fallthrough;
|
|
case ';':
|
|
case '\n':
|
|
ret = xbc_parse_key(&p, q);
|
|
break;
|
|
case '}':
|
|
ret = xbc_close_brace(&p, q);
|
|
break;
|
|
}
|
|
} while (!ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* xbc_exit() - Clean up all parsed bootconfig
|
|
*
|
|
* This clears all data structures of parsed bootconfig on memory.
|
|
* If you need to reuse xbc_init() with new boot config, you can
|
|
* use this.
|
|
*/
|
|
void __init xbc_exit(void)
|
|
{
|
|
xbc_free_mem(xbc_data, xbc_data_size);
|
|
xbc_data = NULL;
|
|
xbc_data_size = 0;
|
|
xbc_node_num = 0;
|
|
xbc_free_mem(xbc_nodes, sizeof(struct xbc_node) * XBC_NODE_MAX);
|
|
xbc_nodes = NULL;
|
|
brace_index = 0;
|
|
}
|
|
|
|
/**
|
|
* xbc_init() - Parse given XBC file and build XBC internal tree
|
|
* @data: The boot config text original data
|
|
* @size: The size of @data
|
|
* @emsg: A pointer of const char * to store the error message
|
|
* @epos: A pointer of int to store the error position
|
|
*
|
|
* This parses the boot config text in @data. @size must be smaller
|
|
* than XBC_DATA_MAX.
|
|
* Return the number of stored nodes (>0) if succeeded, or -errno
|
|
* if there is any error.
|
|
* In error cases, @emsg will be updated with an error message and
|
|
* @epos will be updated with the error position which is the byte offset
|
|
* of @buf. If the error is not a parser error, @epos will be -1.
|
|
*/
|
|
int __init xbc_init(const char *data, size_t size, const char **emsg, int *epos)
|
|
{
|
|
int ret;
|
|
|
|
if (epos)
|
|
*epos = -1;
|
|
|
|
if (xbc_data) {
|
|
if (emsg)
|
|
*emsg = "Bootconfig is already initialized";
|
|
return -EBUSY;
|
|
}
|
|
if (size > XBC_DATA_MAX || size == 0) {
|
|
if (emsg)
|
|
*emsg = size ? "Config data is too big" :
|
|
"Config data is empty";
|
|
return -ERANGE;
|
|
}
|
|
|
|
xbc_data = xbc_alloc_mem(size + 1);
|
|
if (!xbc_data) {
|
|
if (emsg)
|
|
*emsg = "Failed to allocate bootconfig data";
|
|
return -ENOMEM;
|
|
}
|
|
memcpy(xbc_data, data, size);
|
|
xbc_data[size] = '\0';
|
|
xbc_data_size = size + 1;
|
|
|
|
xbc_nodes = xbc_alloc_mem(sizeof(struct xbc_node) * XBC_NODE_MAX);
|
|
if (!xbc_nodes) {
|
|
if (emsg)
|
|
*emsg = "Failed to allocate bootconfig nodes";
|
|
xbc_exit();
|
|
return -ENOMEM;
|
|
}
|
|
memset(xbc_nodes, 0, sizeof(struct xbc_node) * XBC_NODE_MAX);
|
|
|
|
ret = xbc_parse_tree();
|
|
if (!ret)
|
|
ret = xbc_verify_tree();
|
|
|
|
if (ret < 0) {
|
|
if (epos)
|
|
*epos = xbc_err_pos;
|
|
if (emsg)
|
|
*emsg = xbc_err_msg;
|
|
xbc_exit();
|
|
} else
|
|
ret = xbc_node_num;
|
|
|
|
return ret;
|
|
}
|