[linux-2.6-block.git] / kernel / kexec_internal.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef LINUX_KEXEC_INTERNAL_H
#define LINUX_KEXEC_INTERNAL_H

#include <linux/kexec.h>

struct kexec_segment;

struct kimage *do_kimage_alloc_init(void);
int sanity_check_segment_list(struct kimage *image);
void kimage_free_page_list(struct list_head *list);
void kimage_free(struct kimage *image);
int kimage_load_segment(struct kimage *image, struct kexec_segment *segment);
void kimage_terminate(struct kimage *image);
int kimage_is_destination_range(struct kimage *image,
				unsigned long start, unsigned long end);

/*
 * Whatever is used to serialize accesses to the kexec_crash_image needs to be
 * NMI safe, as __crash_kexec() can happen during nmi_panic(), so here we use a
 * "simple" atomic variable that is acquired with a cmpxchg().
 */
extern atomic_t __kexec_lock;
static inline bool kexec_trylock(void)
{
	int old = 0;
	return atomic_try_cmpxchg_acquire(&__kexec_lock, &old, 1);
}
static inline void kexec_unlock(void)
{
	atomic_set_release(&__kexec_lock, 0);
}

#ifdef CONFIG_KEXEC_FILE
#include <linux/purgatory.h>
void kimage_file_post_load_cleanup(struct kimage *image);
extern char kexec_purgatory[];
extern size_t kexec_purgatory_size;
#else /* CONFIG_KEXEC_FILE */
static inline void kimage_file_post_load_cleanup(struct kimage *image) { }
#endif /* CONFIG_KEXEC_FILE */

struct kexec_buf;

#ifdef CONFIG_KEXEC_HANDOVER
int kho_locate_mem_hole(struct kexec_buf *kbuf,
			int (*func)(struct resource *, void *));
int kho_fill_kimage(struct kimage *image);
#else
static inline int kho_locate_mem_hole(struct kexec_buf *kbuf,
				      int (*func)(struct resource *, void *))
{
	return 1;
}

static inline int kho_fill_kimage(struct kimage *image) { return 0; }
#endif /* CONFIG_KEXEC_HANDOVER */
#endif /* LINUX_KEXEC_INTERNAL_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
a43cac0d DY	2	#ifndef LINUX_KEXEC_INTERNAL_H
	3	#define LINUX_KEXEC_INTERNAL_H
	4
	5	#include <linux/kexec.h>
	6
2c44b67e BH	7	struct kexec_segment;
2c44b67e BH	8
a43cac0d DY	9	struct kimage *do_kimage_alloc_init(void);
	10	int sanity_check_segment_list(struct kimage *image);
	11	void kimage_free_page_list(struct list_head *list);
	12	void kimage_free(struct kimage *image);
	13	int kimage_load_segment(struct kimage image, struct kexec_segment segment);
	14	void kimage_terminate(struct kimage *image);
	15	int kimage_is_destination_range(struct kimage *image,
	16	unsigned long start, unsigned long end);
	17
05c62574 VS	18	/*
	19	* Whatever is used to serialize accesses to the kexec_crash_image needs to be
	20	* NMI safe, as __crash_kexec() can happen during nmi_panic(), so here we use a
	21	* "simple" atomic variable that is acquired with a cmpxchg().
	22	*/
	23	extern atomic_t __kexec_lock;
	24	static inline bool kexec_trylock(void)
	25	{
acf02be3 UB	26	int old = 0;
acf02be3 UB	27	return atomic_try_cmpxchg_acquire(&__kexec_lock, &old, 1);
05c62574 VS	28	}
	29	static inline void kexec_unlock(void)
	30	{
	31	atomic_set_release(&__kexec_lock, 0);
	32	}
a43cac0d DY	33
a43cac0d DY	34	#ifdef CONFIG_KEXEC_FILE
40c50c1f	35	#include <linux/purgatory.h>
a43cac0d	36	void kimage_file_post_load_cleanup(struct kimage *image);
e2ae8ab4 KC	37	extern char kexec_purgatory[];
e2ae8ab4 KC	38	extern size_t kexec_purgatory_size;
a43cac0d DY	39	#else /* CONFIG_KEXEC_FILE */
	40	static inline void kimage_file_post_load_cleanup(struct kimage *image) { }
	41	#endif /* CONFIG_KEXEC_FILE */
3bdecc3c AG	42
	43	struct kexec_buf;
	44
	45	#ifdef CONFIG_KEXEC_HANDOVER
	46	int kho_locate_mem_hole(struct kexec_buf *kbuf,
	47	int (func)(struct resource , void *));
	48	int kho_fill_kimage(struct kimage *image);
	49	#else
	50	static inline int kho_locate_mem_hole(struct kexec_buf *kbuf,
	51	int (func)(struct resource , void *))
	52	{
	53	return 1;
	54	}
	55
	56	static inline int kho_fill_kimage(struct kimage *image) { return 0; }
	57	#endif /* CONFIG_KEXEC_HANDOVER */
a43cac0d	58	#endif /* LINUX_KEXEC_INTERNAL_H */