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#include <linux/suspend.h>

#include <linux/utsname.h>

struct swsusp_info {

        struct new_utsname      uts;

        u32                     version_code;

        unsigned long           num_physpages;

        int                     cpus;

        unsigned long           image_pages;

        unsigned long           pages;

        unsigned long           size;

} __attribute__((aligned(PAGE_SIZE)));

#ifdef CONFIG_HIBERNATION

#ifdef CONFIG_ARCH_HIBERNATION_HEADER

/* Maximum size of architecture specific data in a hibernation header */

#define MAX_ARCH_HEADER_SIZE    (sizeof(struct new_utsname) + 4)

extern int arch_hibernation_header_save(void *addr, unsigned int max_size);

extern int arch_hibernation_header_restore(void *addr);

static inline int init_header_complete(struct swsusp_info *info)

{

        return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE);

}

static inline char *check_image_kernel(struct swsusp_info *info)

{

        return arch_hibernation_header_restore(info) ?

                        "architecture specific data" : NULL;

}

#endif /* CONFIG_ARCH_HIBERNATION_HEADER */

/*

 * Keep some memory free so that I/O operations can succeed without paging

 * [Might this be more than 4 MB?]

 */

#define PAGES_FOR_IO    ((4096 * 1024) >> PAGE_SHIFT)

/*

 * Keep 1 MB of memory free so that device drivers can allocate some pages in

 * their .suspend() routines without breaking the suspend to disk.

 */

#define SPARE_PAGES     ((1024 * 1024) >> PAGE_SHIFT)

/* kernel/power/disk.c */

extern int hibernation_snapshot(int platform_mode);

extern int hibernation_restore(int platform_mode);

extern int hibernation_platform_enter(void);

#endif

extern int pfn_is_nosave(unsigned long);

extern struct mutex pm_mutex;

#define power_attr(_name) \

static struct subsys_attribute _name##_attr = { \

        .attr   = {                             \

                .name = __stringify(_name),     \

                .mode = 0644,                   \

        },                                      \

        .show   = _name##_show,                 \

        .store  = _name##_store,                \

}

extern struct kset power_subsys;

/* Preferred image size in bytes (default 500 MB) */

extern unsigned long image_size;

extern int in_suspend;

extern dev_t swsusp_resume_device;

extern sector_t swsusp_resume_block;

extern asmlinkage int swsusp_arch_suspend(void);

extern asmlinkage int swsusp_arch_resume(void);

extern int create_basic_memory_bitmaps(void);

extern void free_basic_memory_bitmaps(void);

extern unsigned int count_data_pages(void);

/**

 *      Auxiliary structure used for reading the snapshot image data and

 *      metadata from and writing them to the list of page backup entries

 *      (PBEs) which is the main data structure of swsusp.

 *

 *      Using struct snapshot_handle we can transfer the image, including its

 *      metadata, as a continuous sequence of bytes with the help of

 *      snapshot_read_next() and snapshot_write_next().

 *

 *      The code that writes the image to a storage or transfers it to

 *      the user land is required to use snapshot_read_next() for this

 *      purpose and it should not make any assumptions regarding the internal

 *      structure of the image.  Similarly, the code that reads the image from

 *      a storage or transfers it from the user land is required to use

 *      snapshot_write_next().

 *

 *      This may allow us to change the internal structure of the image

 *      in the future with considerably less effort.

 */

struct snapshot_handle {

        loff_t          offset; /* number of the last byte ready for reading

                                 * or writing in the sequence

                                 */

        unsigned int    cur;    /* number of the block of PAGE_SIZE bytes the

                                 * next operation will refer to (ie. current)

                                 */

        unsigned int    cur_offset;     /* offset with respect to the current

                                         * block (for the next operation)

                                         */

        unsigned int    prev;   /* number of the block of PAGE_SIZE bytes that

                                 * was the current one previously

                                 */

        void            *buffer;        /* address of the block to read from

                                         * or write to

                                         */

        unsigned int    buf_offset;     /* location to read from or write to,

                                         * given as a displacement from 'buffer'

                                         */

        int             sync_read;      /* Set to one to notify the caller of

                                         * snapshot_write_next() that it may

                                         * need to call wait_on_bio_chain()

                                         */

};

/* This macro returns the address from/to which the caller of

 * snapshot_read_next()/snapshot_write_next() is allowed to

 * read/write data after the function returns

 */

#define data_of(handle) ((handle).buffer + (handle).buf_offset)

extern unsigned int snapshot_additional_pages(struct zone *zone);

extern int snapshot_read_next(struct snapshot_handle *handle, size_t count);

extern int snapshot_write_next(struct snapshot_handle *handle, size_t count);

extern void snapshot_write_finalize(struct snapshot_handle *handle);

extern int snapshot_image_loaded(struct snapshot_handle *handle);

/*

 * This structure is used to pass the values needed for the identification

 * of the resume swap area from a user space to the kernel via the

 * SNAPSHOT_SET_SWAP_AREA ioctl

 */

struct resume_swap_area {

        loff_t offset;

        u_int32_t dev;

} __attribute__((packed));

#define SNAPSHOT_IOC_MAGIC      '3'

#define SNAPSHOT_FREEZE                 _IO(SNAPSHOT_IOC_MAGIC, 1)

#define SNAPSHOT_UNFREEZE               _IO(SNAPSHOT_IOC_MAGIC, 2)

#define SNAPSHOT_ATOMIC_SNAPSHOT        _IOW(SNAPSHOT_IOC_MAGIC, 3, void *)

#define SNAPSHOT_ATOMIC_RESTORE         _IO(SNAPSHOT_IOC_MAGIC, 4)

#define SNAPSHOT_FREE                   _IO(SNAPSHOT_IOC_MAGIC, 5)

#define SNAPSHOT_SET_IMAGE_SIZE         _IOW(SNAPSHOT_IOC_MAGIC, 6, unsigned long)

#define SNAPSHOT_AVAIL_SWAP             _IOR(SNAPSHOT_IOC_MAGIC, 7, void *)

#define SNAPSHOT_GET_SWAP_PAGE          _IOR(SNAPSHOT_IOC_MAGIC, 8, void *)

#define SNAPSHOT_FREE_SWAP_PAGES        _IO(SNAPSHOT_IOC_MAGIC, 9)

#define SNAPSHOT_SET_SWAP_FILE          _IOW(SNAPSHOT_IOC_MAGIC, 10, unsigned int)

#define SNAPSHOT_S2RAM                  _IO(SNAPSHOT_IOC_MAGIC, 11)

#define SNAPSHOT_PMOPS                  _IOW(SNAPSHOT_IOC_MAGIC, 12, unsigned int)

#define SNAPSHOT_SET_SWAP_AREA          _IOW(SNAPSHOT_IOC_MAGIC, 13, \

                                                        struct resume_swap_area)

#define SNAPSHOT_IOC_MAXNR      13

#define PMOPS_PREPARE   1

#define PMOPS_ENTER     2

#define PMOPS_FINISH    3

/* If unset, the snapshot device cannot be open. */

extern atomic_t snapshot_device_available;

extern sector_t alloc_swapdev_block(int swap);

extern void free_all_swap_pages(int swap);

extern int swsusp_swap_in_use(void);

/*

 * Flags that can be passed from the hibernatig hernel to the "boot" kernel in

 * the image header.

 */

#define SF_PLATFORM_MODE        1

/* kernel/power/disk.c */

extern int swsusp_check(void);

extern int swsusp_shrink_memory(void);

extern void swsusp_free(void);

extern int swsusp_resume(void);

extern int swsusp_read(unsigned int *flags_p);

extern int swsusp_write(unsigned int flags);

extern void swsusp_close(void);

struct timeval;

/* kernel/power/swsusp.c */

extern void swsusp_show_speed(struct timeval *, struct timeval *,

                                unsigned int, char *);

#ifdef CONFIG_SUSPEND

/* kernel/power/main.c */

extern int suspend_devices_and_enter(suspend_state_t state);

#else /* !CONFIG_SUSPEND */

static inline int suspend_devices_and_enter(suspend_state_t state)

{

        return -ENOSYS;

}

#endif /* !CONFIG_SUSPEND */

/* kernel/power/common.c */

extern struct blocking_notifier_head pm_chain_head;

static inline int pm_notifier_call_chain(unsigned long val)

{

        return (blocking_notifier_call_chain(&pm_chain_head, val, NULL)

                        == NOTIFY_BAD) ? -EINVAL : 0;

}