HOME

#ifndef _ASM_GENERIC_SECTIONS_H_
#define _ASM_GENERIC_SECTIONS_H_

/* References to section boundaries */

#include <linux/types.h>

extern char _text[], _stext[], _etext[];
extern char _data[], _sdata[], _edata[];
extern char __bss_start[], __bss_stop[];
extern char __init_begin[], __init_end[];
extern char _sinittext[], _einittext[];
extern char _end[];
extern char __per_cpu_load[], __per_cpu_start[], __per_cpu_end[];
extern char __kprobes_text_start[], __kprobes_text_end[];
extern char __entry_text_start[], __entry_text_end[];
extern char __irqentry_text_start[], __irqentry_text_end[];
extern char __initdata_begin[], __initdata_end[];
extern char __start_rodata[], __end_rodata[];

/* Start and end of .ctors section - used for constructor calls. */
extern char __ctors_start[], __ctors_end[];

/* function descriptor handling (if any).  Override
 * in asm/sections.h */
#ifndef dereference_function_descriptor
#define dereference_function_descriptor(p) (p)
#endif

/* random extra sections (if any).  Override
 * in asm/sections.h */
#ifndef arch_is_kernel_text
static inline int arch_is_kernel_text(unsigned long addr)
{
	return 0;
}
#endif

#ifndef arch_is_kernel_data
static inline int arch_is_kernel_data(unsigned long addr)
{
	return 0;
}
#endif

/**
 * memory_contains - checks if an object is contained within a memory region
 * @begin: virtual address of the beginning of the memory region
 * @end: virtual address of the end of the memory region
 * @virt: virtual address of the memory object
 * @size: size of the memory object
 *
 * Returns: true if the object specified by @virt and @size is entirely
 * contained within the memory region defined by @begin and @end, false
 * otherwise.
 */
static inline bool memory_contains(void *begin, void *end, void *virt,
				   size_t size)
{
	return virt >= begin && virt + size <= end;
}

/**
 * memory_intersects - checks if the region occupied by an object intersects
 *                     with another memory region
 * @begin: virtual address of the beginning of the memory regien
 * @end: virtual address of the end of the memory region
 * @virt: virtual address of the memory object
 * @size: size of the memory object
 *
 * Returns: true if an object's memory region, specified by @virt and @size,
 * intersects with the region specified by @begin and @end, false otherwise.
 */
static inline bool memory_intersects(void *begin, void *end, void *virt,
				     size_t size)
{
	void *vend = virt + size;

	return (virt >= begin && virt < end) || (vend >= begin && vend < end);
}

/**
 * init_section_contains - checks if an object is contained within the init
 *                         section
 * @virt: virtual address of the memory object
 * @size: size of the memory object
 *
 * Returns: true if the object specified by @virt and @size is entirely
 * contained within the init section, false otherwise.
 */
static inline bool init_section_contains(void *virt, size_t size)
{
	return memory_contains(__init_begin, __init_end, virt, size);
}

/**
 * init_section_intersects - checks if the region occupied by an object
 *                           intersects with the init section
 * @virt: virtual address of the memory object
 * @size: size of the memory object
 *
 * Returns: true if an object's memory region, specified by @virt and @size,
 * intersects with the init section, false otherwise.
 */
static inline bool init_section_intersects(void *virt, size_t size)
{
	return memory_intersects(__init_begin, __init_end, virt, size);
}

#endif /* _ASM_GENERIC_SECTIONS_H_ */