150 lines
3.7 KiB
C
Executable File
150 lines
3.7 KiB
C
Executable File
#ifndef _LINUX_MMZONE_H
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#define _LINUX_MMZONE_H
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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#include <linux/config.h>
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#include <linux/spinlock.h>
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#include <linux/list.h>
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/*
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* Free memory management - zoned buddy allocator.
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*/
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#ifdef CONFIG_FORCE_MAX_ZONEORDER
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#define MAX_ORDER CONFIG_FORCE_MAX_ZONEORDER
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#elif defined(CONFIG_NO_MMU_LARGE_ALLOCS)
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#define MAX_ORDER 11
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#else
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#define MAX_ORDER 10
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#endif
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typedef struct free_area_struct {
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struct list_head free_list;
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unsigned long *map;
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} free_area_t;
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struct pglist_data;
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/*
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* On machines where it is needed (eg PCs) we divide physical memory
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* into multiple physical zones. On a PC we have 3 zones:
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*
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* ZONE_DMA < 16 MB ISA DMA capable memory
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* ZONE_NORMAL 16-896 MB direct mapped by the kernel
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* ZONE_HIGHMEM > 896 MB only page cache and user processes
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*/
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typedef struct zone_struct {
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/*
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* Commonly accessed fields:
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*/
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spinlock_t lock;
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unsigned long free_pages;
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unsigned long pages_min, pages_low, pages_high;
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int need_balance;
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/*
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* free areas of different sizes
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*/
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free_area_t free_area[MAX_ORDER];
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/*
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* Discontig memory support fields.
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*/
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struct pglist_data *zone_pgdat;
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struct page *zone_mem_map;
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unsigned long zone_start_paddr;
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unsigned long zone_start_mapnr;
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/*
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* rarely used fields:
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*/
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char *name;
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unsigned long size;
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} zone_t;
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#define ZONE_DMA 0
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#define ZONE_NORMAL 1
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#define ZONE_HIGHMEM 2
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#define MAX_NR_ZONES 3
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/*
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* One allocation request operates on a zonelist. A zonelist
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* is a list of zones, the first one is the 'goal' of the
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* allocation, the other zones are fallback zones, in decreasing
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* priority.
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*
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* Right now a zonelist takes up less than a cacheline. We never
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* modify it apart from boot-up, and only a few indices are used,
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* so despite the zonelist table being relatively big, the cache
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* footprint of this construct is very small.
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*/
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typedef struct zonelist_struct {
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zone_t * zones [MAX_NR_ZONES+1]; // NULL delimited
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} zonelist_t;
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#define GFP_ZONEMASK 0x0f
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/*
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* The pg_data_t structure is used in machines with CONFIG_DISCONTIGMEM
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* (mostly NUMA machines?) to denote a higher-level memory zone than the
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* zone_struct denotes.
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*
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* On NUMA machines, each NUMA node would have a pg_data_t to describe
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* it's memory layout.
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*
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* XXX: we need to move the global memory statistics (active_list, ...)
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* into the pg_data_t to properly support NUMA.
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*/
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struct bootmem_data;
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typedef struct pglist_data {
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zone_t node_zones[MAX_NR_ZONES];
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zonelist_t node_zonelists[GFP_ZONEMASK+1];
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int nr_zones;
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struct page *node_mem_map;
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unsigned long *valid_addr_bitmap;
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struct bootmem_data *bdata;
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unsigned long node_start_paddr;
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unsigned long node_start_mapnr;
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unsigned long node_size;
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int node_id;
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struct pglist_data *node_next;
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} pg_data_t;
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extern int numnodes;
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extern pg_data_t *pgdat_list;
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#define memclass(pgzone, classzone) (((pgzone)->zone_pgdat == (classzone)->zone_pgdat) \
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&& ((pgzone) <= (classzone)))
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/*
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* The following two are not meant for general usage. They are here as
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* prototypes for the discontig memory code.
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*/
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struct page;
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extern void show_free_areas_core(pg_data_t *pgdat);
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extern void free_area_init_core(int nid, pg_data_t *pgdat, struct page **gmap,
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unsigned long *zones_size, unsigned long paddr, unsigned long *zholes_size,
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struct page *pmap);
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extern pg_data_t contig_page_data;
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#ifndef CONFIG_DISCONTIGMEM
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#define NODE_DATA(nid) (&contig_page_data)
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#define NODE_MEM_MAP(nid) mem_map
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#else /* !CONFIG_DISCONTIGMEM */
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#include <asm/mmzone.h>
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#endif /* !CONFIG_DISCONTIGMEM */
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#define MAP_ALIGN(x) ((((x) % sizeof(mem_map_t)) == 0) ? (x) : ((x) + \
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sizeof(mem_map_t) - ((x) % sizeof(mem_map_t))))
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#endif /* !__ASSEMBLY__ */
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#endif /* __KERNEL__ */
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#endif /* _LINUX_MMZONE_H */
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