zone.h

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enum zone_type {
        ZONE_BASE,
        ZONE_NORMAL, 
        ZONE_HIMEM,
        ZONE_SYSTEM,
        ZONE_MAX,
};

struct zone {
        struct list_head head; 
        struct node *node; 
        enum zone_type type; 
        struct page_allocator *handle;

        struct list_head page_list;
        struct list_head managed_page_list;
};

extern int create_zone(struct node *node,
                enum zone_type zone, off_t base, size_t size);

extern struct zone *find_zone(enum zone_type zone);
extern struct zone *find_zone_by_addr(void *pma);

extern int destroy_zone(struct zone *zone);