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#ifndef _LINUX_MM_H
#define _LINUX_MM_H
#include <asm/page.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/string.h>
#define VERIFY_READ 0
#define VERIFY_WRITE 1
extern int verify_area(int, const void *, unsigned long);
/*
* Linux kernel virtual memory manager primitives.
* The idea being to have a "virtual" mm in the same way
* we have a virtual fs - giving a cleaner interface to the
* mm details, and allowing different kinds of memory mappings
* (from shared memory to executable loading to arbitrary
* mmap() functions).
*/
/*
* This struct defines a memory VMM memory area. There is one of these
* per VM-area/task. A VM area is any part of the process virtual memory
* space that has a special rule for the page-fault handlers (ie a shared
* library, the executable area etc).
*/
struct vm_area_struct {
struct task_struct * vm_task; /* VM area parameters */
unsigned long vm_start;
unsigned long vm_end;
unsigned short vm_page_prot;
unsigned short vm_flags;
struct vm_area_struct * vm_next; /* linked list */
struct vm_area_struct * vm_share; /* linked list */
struct vm_operations_struct * vm_ops;
unsigned long vm_offset;
struct inode * vm_inode;
unsigned long vm_pte; /* shared mem */
};
/*
* vm_flags..
*/
#define VM_READ 0x0001 /* currently active flags */
#define VM_WRITE 0x0002
#define VM_EXEC 0x0004
#define VM_SHARED 0x0008
#define VM_MAYREAD 0x0010 /* limits for mprotect() etc */
#define VM_MAYWRITE 0x0020
#define VM_MAYEXEC 0x0040
#define VM_MAYSHARE 0x0080
#define VM_GROWSDOWN 0x0100 /* general info on the segment */
#define VM_GROWSUP 0x0200
#define VM_SHM 0x0400
#define VM_DENYWRITE 0x0800 /* ETXTBSY on write attempts.. */
#define VM_EXECUTABLE 0x1000
#define VM_STACK_FLAGS 0x0177
/*
* These are the virtual MM functions - opening of an area, closing it (needed to
* keep files on disk up-to-date etc), pointer to the functions called when a
* no-page or a wp-page exception occurs, and the function which decides on sharing
* of pages between different processes.
*/
struct vm_operations_struct {
void (*open)(struct vm_area_struct * area);
void (*close)(struct vm_area_struct * area);
unsigned long (*nopage)(struct vm_area_struct * area, unsigned long address,
unsigned long page, int error_code);
unsigned long (*wppage)(struct vm_area_struct * area, unsigned long address,
unsigned long page);
int (*share)(struct vm_area_struct * from, struct vm_area_struct * to, unsigned long address);
int (*unmap)(struct vm_area_struct *area, unsigned long, size_t);
void (*swapout)(struct vm_area_struct *, unsigned long *);
unsigned long (*swapin)(struct vm_area_struct *, unsigned long);
};
extern unsigned long __bad_page(void);
extern unsigned long __bad_pagetable(void);
extern unsigned long __zero_page(void);
#define BAD_PAGETABLE __bad_pagetable()
#define BAD_PAGE __bad_page()
#define ZERO_PAGE __zero_page()
/* planning stage.. */
#define P_DIRTY 0x0001
#define P_LOCKED 0x0002
#define P_UPTODATE 0x0004
#define P_RESERVED 0x8000
struct page_info {
unsigned short flags;
unsigned short count;
struct inode * inode;
unsigned long offset;
struct page_info * next_same_inode;
struct page_info * prev_same_inode;
struct page_info * next_hash;
struct page_info * prev_hash;
struct wait_queue *wait;
};
/* end of planning stage */
#ifdef __KERNEL__
/*
* Free area management
*/
extern int nr_swap_pages;
extern int nr_free_pages;
extern int min_free_pages;
#define NR_MEM_LISTS 6
struct mem_list {
struct mem_list * next;
struct mem_list * prev;
};
extern struct mem_list free_area_list[NR_MEM_LISTS];
extern unsigned char * free_area_map[NR_MEM_LISTS];
/*
* This is timing-critical - most of the time in getting a new page
* goes to clearing the page. If you want a page without the clearing
* overhead, just use __get_free_page() directly..
*/
#define __get_free_page(priority) __get_free_pages((priority),0)
extern unsigned long __get_free_pages(int priority, unsigned long gfporder);
extern inline unsigned long get_free_page(int priority)
{
unsigned long page;
page = __get_free_page(priority);
if (page)
memset((void *)page, 0, 4096);
return page;
}
/* memory.c & swap.c*/
#define free_page(addr) free_pages((addr),0)
extern void free_pages(unsigned long addr, unsigned long order);
extern void show_free_areas(void);
extern unsigned long put_dirty_page(struct task_struct * tsk,unsigned long page,
unsigned long address);
extern void free_page_tables(struct task_struct * tsk);
extern void clear_page_tables(struct task_struct * tsk);
extern int copy_page_tables(struct task_struct * to);
extern int clone_page_tables(struct task_struct * to);
extern int unmap_page_range(unsigned long from, unsigned long size);
extern int remap_page_range(unsigned long from, unsigned long to, unsigned long size, int mask);
extern int zeromap_page_range(unsigned long from, unsigned long size, int mask);
extern void do_wp_page(struct vm_area_struct * vma, unsigned long address,
unsigned long error_code);
extern void do_no_page(struct vm_area_struct * vma, unsigned long address,
unsigned long error_code);
extern unsigned long paging_init(unsigned long start_mem, unsigned long end_mem);
extern void show_mem(void);
extern void oom(struct task_struct * task);
extern void si_meminfo(struct sysinfo * val);
/* vmalloc.c */
extern void * vmalloc(unsigned long size);
extern void vfree(void * addr);
extern int vread(char *buf, char *addr, int count);
/* swap.c */
extern void swap_free(unsigned long page_nr);
extern unsigned long swap_duplicate(unsigned long page_nr);
extern unsigned long swap_in(unsigned long entry);
extern void si_swapinfo(struct sysinfo * val);
extern void rw_swap_page(int rw, unsigned long nr, char * buf);
/* mmap.c */
extern int do_mmap(struct file * file, unsigned long addr, unsigned long len,
unsigned long prot, unsigned long flags, unsigned long off);
extern void merge_segments(struct vm_area_struct *);
extern void insert_vm_struct(struct task_struct *, struct vm_area_struct *);
extern int do_munmap(unsigned long, size_t);
extern unsigned long get_unmapped_area(unsigned long);
#define read_swap_page(nr,buf) \
rw_swap_page(READ,(nr),(buf))
#define write_swap_page(nr,buf) \
rw_swap_page(WRITE,(nr),(buf))
extern unsigned long high_memory;
#define MAP_NR(addr) ((addr) >> PAGE_SHIFT)
#define MAP_PAGE_RESERVED (1<<15)
extern unsigned short * mem_map;
#define GFP_BUFFER 0x00
#define GFP_ATOMIC 0x01
#define GFP_USER 0x02
#define GFP_KERNEL 0x03
#define GFP_NOBUFFER 0x04
#define GFP_NFS 0x05
/* Flag - indicates that the buffer will be suitable for DMA. Ignored on some
platforms, used as appropriate on others */
#define GFP_DMA 0x80
/*
* vm_ops not present page codes for shared memory.
*
* Will go away eventually..
*/
#define SHM_SWP_TYPE 0x41
extern void shm_no_page (ulong *);
/*
* swap cache stuff (in swap.c)
*/
#define SWAP_CACHE_INFO
extern unsigned long * swap_cache;
#ifdef SWAP_CACHE_INFO
extern unsigned long swap_cache_add_total;
extern unsigned long swap_cache_add_success;
extern unsigned long swap_cache_del_total;
extern unsigned long swap_cache_del_success;
extern unsigned long swap_cache_find_total;
extern unsigned long swap_cache_find_success;
#endif
extern inline unsigned long in_swap_cache(unsigned long addr)
{
return swap_cache[addr >> PAGE_SHIFT];
}
/*
* Include machine dependend stuff
*/
#include <asm/mm.h>
#endif /* __KERNEL__ */
#endif
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