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Line 56... Line 56...
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  */
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    __u8 buddy_order;   /**< buddy system block order */
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    __u8 buddy_order;   /**< buddy system block order */
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    link_t buddy_link;  /**< link to the next free block inside one order */
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    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 */
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    void *parent;           /**< If allocated by slab, this points there */
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}frame_t;
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} frame_t;
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typedef struct {
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typedef struct {
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    SPINLOCK_DECLARE(lock); /**< this lock protects everything below */
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    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 */
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    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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80
 
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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;
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    return v;
943
}
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}
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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.
948
 * Decrement frame reference count.
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 * If it drops to zero, move the frame structure to free list.
949
 * 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.
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 */
952
 */
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void frame_free(pfn_t pfn)
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void frame_free(pfn_t pfn)
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{
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{
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    ipl_t ipl;
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    ipl_t ipl;
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    zone_t *zone;
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    zone_t *zone;
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968
    spinlock_unlock(&zone->lock);
968
    spinlock_unlock(&zone->lock);
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    interrupts_restore(ipl);
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    interrupts_restore(ipl);
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}
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}
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;