232 lines
7.1 KiB
C
232 lines
7.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_XBC_H
|
|
#define _LINUX_XBC_H
|
|
/*
|
|
* Extra Boot Config
|
|
* Copyright (C) 2019 Linaro Ltd.
|
|
* Author: Masami Hiramatsu <mhiramat@kernel.org>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/types.h>
|
|
|
|
#define BOOTCONFIG_MAGIC "#BOOTCONFIG\n"
|
|
#define BOOTCONFIG_MAGIC_LEN 12
|
|
#define BOOTCONFIG_ALIGN_SHIFT 2
|
|
#define BOOTCONFIG_ALIGN (1 << BOOTCONFIG_ALIGN_SHIFT)
|
|
#define BOOTCONFIG_ALIGN_MASK (BOOTCONFIG_ALIGN - 1)
|
|
|
|
/* XBC tree node */
|
|
struct xbc_node {
|
|
u16 next;
|
|
u16 child;
|
|
u16 parent;
|
|
u16 data;
|
|
} __attribute__ ((__packed__));
|
|
|
|
#define XBC_KEY 0
|
|
#define XBC_VALUE (1 << 15)
|
|
/* Maximum size of boot config is 32KB - 1 */
|
|
#define XBC_DATA_MAX (XBC_VALUE - 1)
|
|
|
|
#define XBC_NODE_MAX 1024
|
|
#define XBC_KEYLEN_MAX 256
|
|
#define XBC_DEPTH_MAX 16
|
|
|
|
/* Node tree access raw APIs */
|
|
struct xbc_node * __init xbc_root_node(void);
|
|
int __init xbc_node_index(struct xbc_node *node);
|
|
struct xbc_node * __init xbc_node_get_parent(struct xbc_node *node);
|
|
struct xbc_node * __init xbc_node_get_child(struct xbc_node *node);
|
|
struct xbc_node * __init xbc_node_get_next(struct xbc_node *node);
|
|
const char * __init xbc_node_get_data(struct xbc_node *node);
|
|
|
|
/**
|
|
* xbc_node_is_value() - Test the node is a value node
|
|
* @node: An XBC node.
|
|
*
|
|
* Test the @node is a value node and return true if a value node, false if not.
|
|
*/
|
|
static inline __init bool xbc_node_is_value(struct xbc_node *node)
|
|
{
|
|
return node->data & XBC_VALUE;
|
|
}
|
|
|
|
/**
|
|
* xbc_node_is_key() - Test the node is a key node
|
|
* @node: An XBC node.
|
|
*
|
|
* Test the @node is a key node and return true if a key node, false if not.
|
|
*/
|
|
static inline __init bool xbc_node_is_key(struct xbc_node *node)
|
|
{
|
|
return !xbc_node_is_value(node);
|
|
}
|
|
|
|
/**
|
|
* xbc_node_is_array() - Test the node is an arraied value node
|
|
* @node: An XBC node.
|
|
*
|
|
* Test the @node is an arraied value node.
|
|
*/
|
|
static inline __init bool xbc_node_is_array(struct xbc_node *node)
|
|
{
|
|
return xbc_node_is_value(node) && node->next != 0;
|
|
}
|
|
|
|
/**
|
|
* xbc_node_is_leaf() - Test the node is a leaf key node
|
|
* @node: An XBC node.
|
|
*
|
|
* Test the @node is a leaf key node which is a key node and has a value node
|
|
* or no child. Returns true if it is a leaf node, or false if not.
|
|
*/
|
|
static inline __init bool xbc_node_is_leaf(struct xbc_node *node)
|
|
{
|
|
return xbc_node_is_key(node) &&
|
|
(!node->child || xbc_node_is_value(xbc_node_get_child(node)));
|
|
}
|
|
|
|
/* Tree-based key-value access APIs */
|
|
struct xbc_node * __init xbc_node_find_child(struct xbc_node *parent,
|
|
const char *key);
|
|
|
|
const char * __init xbc_node_find_value(struct xbc_node *parent,
|
|
const char *key,
|
|
struct xbc_node **vnode);
|
|
|
|
struct xbc_node * __init xbc_node_find_next_leaf(struct xbc_node *root,
|
|
struct xbc_node *leaf);
|
|
|
|
const char * __init xbc_node_find_next_key_value(struct xbc_node *root,
|
|
struct xbc_node **leaf);
|
|
|
|
/**
|
|
* xbc_find_value() - Find a value which matches the key
|
|
* @key: Search key
|
|
* @vnode: A container pointer of XBC value node.
|
|
*
|
|
* Search a value whose key matches @key from whole of XBC tree and return
|
|
* the value if found. Found value node is stored in *@vnode.
|
|
* Note that this can return 0-length string and store NULL in *@vnode for
|
|
* key-only (non-value) entry.
|
|
*/
|
|
static inline const char * __init
|
|
xbc_find_value(const char *key, struct xbc_node **vnode)
|
|
{
|
|
return xbc_node_find_value(NULL, key, vnode);
|
|
}
|
|
|
|
/**
|
|
* xbc_find_node() - Find a node which matches the key
|
|
* @key: Search key
|
|
*
|
|
* Search a (key) node whose key matches @key from whole of XBC tree and
|
|
* return the node if found. If not found, returns NULL.
|
|
*/
|
|
static inline struct xbc_node * __init xbc_find_node(const char *key)
|
|
{
|
|
return xbc_node_find_child(NULL, key);
|
|
}
|
|
|
|
/**
|
|
* xbc_array_for_each_value() - Iterate value nodes on an array
|
|
* @anode: An XBC arraied value node
|
|
* @value: A value
|
|
*
|
|
* Iterate array value nodes and values starts from @anode. This is expected to
|
|
* be used with xbc_find_value() and xbc_node_find_value(), so that user can
|
|
* process each array entry node.
|
|
*/
|
|
#define xbc_array_for_each_value(anode, value) \
|
|
for (value = xbc_node_get_data(anode); anode != NULL ; \
|
|
anode = xbc_node_get_next(anode), \
|
|
value = anode ? xbc_node_get_data(anode) : NULL)
|
|
|
|
/**
|
|
* xbc_node_for_each_child() - Iterate child nodes
|
|
* @parent: An XBC node.
|
|
* @child: Iterated XBC node.
|
|
*
|
|
* Iterate child nodes of @parent. Each child nodes are stored to @child.
|
|
*/
|
|
#define xbc_node_for_each_child(parent, child) \
|
|
for (child = xbc_node_get_child(parent); child != NULL ; \
|
|
child = xbc_node_get_next(child))
|
|
|
|
/**
|
|
* xbc_node_for_each_array_value() - Iterate array entries of geven key
|
|
* @node: An XBC node.
|
|
* @key: A key string searched under @node
|
|
* @anode: Iterated XBC node of array entry.
|
|
* @value: Iterated value of array entry.
|
|
*
|
|
* Iterate array entries of given @key under @node. Each array entry node
|
|
* is stroed to @anode and @value. If the @node doesn't have @key node,
|
|
* it does nothing.
|
|
* Note that even if the found key node has only one value (not array)
|
|
* this executes block once. Hoever, if the found key node has no value
|
|
* (key-only node), this does nothing. So don't use this for testing the
|
|
* key-value pair existence.
|
|
*/
|
|
#define xbc_node_for_each_array_value(node, key, anode, value) \
|
|
for (value = xbc_node_find_value(node, key, &anode); value != NULL; \
|
|
anode = xbc_node_get_next(anode), \
|
|
value = anode ? xbc_node_get_data(anode) : NULL)
|
|
|
|
/**
|
|
* xbc_node_for_each_key_value() - Iterate key-value pairs under a node
|
|
* @node: An XBC node.
|
|
* @knode: Iterated key node
|
|
* @value: Iterated value string
|
|
*
|
|
* Iterate key-value pairs under @node. Each key node and value string are
|
|
* stored in @knode and @value respectively.
|
|
*/
|
|
#define xbc_node_for_each_key_value(node, knode, value) \
|
|
for (knode = NULL, value = xbc_node_find_next_key_value(node, &knode);\
|
|
knode != NULL; value = xbc_node_find_next_key_value(node, &knode))
|
|
|
|
/**
|
|
* xbc_for_each_key_value() - Iterate key-value pairs
|
|
* @knode: Iterated key node
|
|
* @value: Iterated value string
|
|
*
|
|
* Iterate key-value pairs in whole XBC tree. Each key node and value string
|
|
* are stored in @knode and @value respectively.
|
|
*/
|
|
#define xbc_for_each_key_value(knode, value) \
|
|
xbc_node_for_each_key_value(NULL, knode, value)
|
|
|
|
/* Compose partial key */
|
|
int __init xbc_node_compose_key_after(struct xbc_node *root,
|
|
struct xbc_node *node, char *buf, size_t size);
|
|
|
|
/**
|
|
* xbc_node_compose_key() - Compose full key string of the XBC node
|
|
* @node: An XBC node.
|
|
* @buf: A buffer to store the key.
|
|
* @size: The size of the @buf.
|
|
*
|
|
* Compose the full-length key of the @node into @buf. Returns the total
|
|
* length of the key stored in @buf. Or returns -EINVAL if @node is NULL,
|
|
* and -ERANGE if the key depth is deeper than max depth.
|
|
*/
|
|
static inline int __init xbc_node_compose_key(struct xbc_node *node,
|
|
char *buf, size_t size)
|
|
{
|
|
return xbc_node_compose_key_after(NULL, node, buf, size);
|
|
}
|
|
|
|
/* XBC node initializer */
|
|
int __init xbc_init(char *buf, const char **emsg, int *epos);
|
|
|
|
|
|
/* XBC cleanup data structures */
|
|
void __init xbc_destroy_all(void);
|
|
|
|
/* Debug dump functions */
|
|
void __init xbc_debug_dump(void);
|
|
|
|
#endif
|