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56 
typedef struct {
 56 
typedef struct {
57 
    count_t refcount;   /**< tracking of shared frames  */
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    count_t refcount;   /**< tracking of shared frames  */
58 
    __u8 buddy_order;   /**< buddy system block order */
 58 
    __u8 buddy_order;   /**< buddy system block order */
59 
    link_t buddy_link;  /**< link to the next free block inside one order */
 59 
    link_t buddy_link;  /**< link to the next free block inside one order */
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    void *parent;           /**< If allocated by slab, this points there */
 60 
    void *parent;           /**< If allocated by slab, this points there */
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}frame_t;
 61 
} frame_t;
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 62 
 
63 
typedef struct {
 63 
typedef struct {
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    SPINLOCK_DECLARE(lock); /**< this lock protects everything below */
 64 
    SPINLOCK_DECLARE(lock); /**< this lock protects everything below */
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    pfn_t base; /**< frame_no of the first frame in the frames array */
 65 
    pfn_t base;     /**< frame_no of the first frame in the frames array */
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    count_t count;          /**< Size of zone */
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    count_t count;          /**< Size of zone */
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    frame_t *frames;    /**< array of frame_t structures in this zone */
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    frame_t *frames;    /**< array of frame_t structures in this zone */
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    count_t free_count; /**< number of free frame_t structures */
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    count_t free_count; /**< number of free frame_t structures */
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    count_t busy_count; /**< number of busy frame_t structures */
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    count_t busy_count; /**< number of busy frame_t structures */
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    buddy_system_t * buddy_system; /**< buddy system for the zone */
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    buddy_system_t * buddy_system; /**< buddy system for the zone */
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    int flags;
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    int flags;
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}zone_t;
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} zone_t;
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/*
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/*
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 * The zoneinfo.lock must be locked when accessing zoneinfo structure.
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 * The zoneinfo.lock must be locked when accessing zoneinfo structure.
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 * Some of the attributes in zone_t structures are 'read-only'
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 * Some of the attributes in zone_t structures are 'read-only'
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 */
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 */
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struct {
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struct {
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    SPINLOCK_DECLARE(lock);
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    SPINLOCK_DECLARE(lock);
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    int count;
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    int count;
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    zone_t *info[ZONES_MAX];
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    zone_t *info[ZONES_MAX];
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}zones;
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} zones;
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/*********************************/
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/*********************************/
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/* Helper functions */
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/* Helper functions */
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static inline index_t frame_index(zone_t *zone, frame_t *frame)
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static inline index_t frame_index(zone_t *zone, frame_t *frame)
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    return v;
 942 
    return v;
943 
}
 943 
}
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 944 
 
945 
/** Free a frame.
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/** Free a frame.
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 *
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 *
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 * Find respective frame structure for supplied addr.
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 * Find respective frame structure for supplied PFN.
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 * Decrement frame reference count.
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 * Decrement frame reference count.
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 * If it drops to zero, move the frame structure to free list.
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 * If it drops to zero, move the frame structure to free list.
950 
 *
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 *
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 * @param frame Frame no to be freed.
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 * @param frame Frame number to be freed.
952 
 */
 952 
 */
953 
void frame_free(pfn_t pfn)
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void frame_free(pfn_t pfn)
954 
{
 954 
{
955 
    ipl_t ipl;
 955 
    ipl_t ipl;
956 
    zone_t *zone;
 956 
    zone_t *zone;
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 967 
   
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    spinlock_unlock(&zone->lock);
 968 
    spinlock_unlock(&zone->lock);
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    interrupts_restore(ipl);
 969 
    interrupts_restore(ipl);
970 
}
 970 
}
971 
 
 971 
 
- 
 
 972 
/** Add reference to frame.
- 
 
 973 
 *
- 
 
 974 
 * Find respective frame structure for supplied PFN and
- 
 
 975 
 * increment frame reference count.
- 
 
 976 
 *
- 
 
 977 
 * @param frame Frame no to be freed.
- 
 
 978 
 */
- 
 
 979 
void frame_reference_add(pfn_t pfn)
- 
 
 980 
{
- 
 
 981 
    ipl_t ipl;
- 
 
 982 
    zone_t *zone;
- 
 
 983 
    frame_t *frame;
972 
 
 984 
 
- 
 
 985 
    ipl = interrupts_disable();
- 
 
 986 
   
- 
 
 987 
    /*
- 
 
 988 
     * First, find host frame zone for addr.
- 
 
 989 
     */
- 
 
 990 
    zone = find_zone_and_lock(pfn,NULL);
- 
 
 991 
    ASSERT(zone);
- 
 
 992 
   
- 
 
 993 
    frame = &zone->frames[pfn-zone->base];
- 
 
 994 
    frame->refcount++;
- 
 
 995 
   
- 
 
 996 
    spinlock_unlock(&zone->lock);
- 
 
 997 
    interrupts_restore(ipl);
- 
 
 998 
}
973 
 
 999 
 
974 
/** Mark given range unavailable in frame zones */
 1000 
/** Mark given range unavailable in frame zones */
975 
void frame_mark_unavailable(pfn_t start, count_t count)
 1001 
void frame_mark_unavailable(pfn_t start, count_t count)
976 
{
 1002 
{
977 
    int i;
 1003 
    int i;