include/linux/bootconfig.h

Source file repositories/reference/linux-study-clean/include/linux/bootconfig.h

File Facts

System
Linux kernel
Corpus path
include/linux/bootconfig.h
Extension
.h
Size
9665 bytes
Lines
312
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct xbc_node {
	uint16_t next;
	uint16_t child;
	uint16_t parent;
	uint16_t 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	8192
#define XBC_KEYLEN_MAX	256
#define XBC_DEPTH_MAX	16

/* Node tree access raw APIs */
struct xbc_node * __init xbc_root_node(void);
uint16_t __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->child != 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.
 * Note that the leaf node can have subkey nodes in addition to the
 * value node.
 */
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_subkey(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.

Annotation

Implementation Notes