158 lines
4.8 KiB
C
158 lines
4.8 KiB
C
#ifndef _LINUX_MM_H
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#define _LINUX_MM_H
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#define PAGE_SIZE 4096
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#define PAGE_SHIFT 12
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#include <linux/fs.h>
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#include <linux/kernel.h>
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/*
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* Linux kernel virtual memory manager primitives.
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* The idea being to have a "virtual" mm in the same way
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* we have a virtual fs - giving a cleaner interface to the
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* mm details, and allowing different kinds of memory mappings
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* (from shared memory to executable loading to arbitrary
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* mmap() functions).
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*/
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/*
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* This struct defines a memory VMM memory area. There is one of these
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* per VM-area/task. A VM area is any part of the process virtual memory
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* space that has a special rule for the page-fault handlers (ie a shared
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* library, the executable area etc).
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*/
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struct vm_area_struct {
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struct task_struct * vm_task; /* VM area parameters */
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unsigned long vm_start;
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unsigned long vm_end;
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struct vm_area_struct * vm_next; /* linked list */
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struct vm_area_struct * vm_share; /* linked list */
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struct inode * vm_inode;
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unsigned long vm_offset;
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struct vm_operations_struct * vm_ops;
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};
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/*
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* These are the virtual MM functions - opening of an area, closing it (needed to
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* keep files on disk up-to-date etc), pointer to the functions called when a
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* no-page or a wp-page exception occurs, and the function which decides on sharing
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* of pages between different processes.
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*/
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struct vm_operations_struct {
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void (*open)(struct vm_area_struct * area);
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void (*close)(struct vm_area_struct * area);
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void (*nopage)(struct vm_area_struct * area, unsigned long address);
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void (*wppage)(struct vm_area_struct * area, unsigned long address);
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int (*share)(struct vm_area_struct * old, struct vm_area_struct * new, unsigned long address);
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};
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/*
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* BAD_PAGE is the page that is used for page faults when linux
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* is out-of-memory. Older versions of linux just did a
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* do_exit(), but using this instead means there is less risk
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* for a process dying in kernel mode, possibly leaving a inode
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* unused etc..
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*
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* BAD_PAGETABLE is the accompanying page-table: it is initialized
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* to point to BAD_PAGE entries.
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*/
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extern unsigned long inline __bad_page(void)
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{
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extern char empty_bad_page[PAGE_SIZE];
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__asm__ __volatile__("cld ; rep ; stosl"
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::"a" (0),
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"D" ((long) empty_bad_page),
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"c" (1024)
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:"di","cx");
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return (unsigned long) empty_bad_page;
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}
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#define BAD_PAGE __bad_page()
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extern unsigned long inline __bad_pagetable(void)
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{
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extern char empty_bad_page_table[PAGE_SIZE];
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__asm__ __volatile__("cld ; rep ; stosl"
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::"a" (7+BAD_PAGE),
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"D" ((long) empty_bad_page_table),
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"c" (1024)
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:"di","cx");
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return (unsigned long) empty_bad_page_table;
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}
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#define BAD_PAGETABLE __bad_pagetable()
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extern volatile short free_page_ptr; /* used by malloc and tcp/ip. */
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extern int nr_free_pages;
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extern unsigned long free_page_list;
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extern int nr_secondary_pages;
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extern unsigned long secondary_page_list;
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#define MAX_SECONDARY_PAGES 10
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extern void rw_swap_page(int rw, unsigned int nr, char * buf);
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#define read_swap_page(nr,buf) \
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rw_swap_page(READ,(nr),(buf))
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#define write_swap_page(nr,buf) \
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rw_swap_page(WRITE,(nr),(buf))
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/* mmap.c */
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/* memory.c */
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extern unsigned long get_free_page(int priority);
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extern unsigned long put_dirty_page(struct task_struct * tsk,unsigned long page,
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unsigned long address);
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extern void free_page(unsigned long addr);
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extern void free_page_tables(struct task_struct * tsk);
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extern void clear_page_tables(struct task_struct * tsk);
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extern int copy_page_tables(struct task_struct * new);
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extern int unmap_page_range(unsigned long from, unsigned long size);
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extern int remap_page_range(unsigned long from, unsigned long to, unsigned long size,
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int permiss);
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extern void write_verify(unsigned long address);
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extern void do_wp_page(unsigned long error_code, unsigned long address,
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struct task_struct *tsk, unsigned long user_esp);
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extern void do_no_page(unsigned long error_code, unsigned long address,
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struct task_struct *tsk, unsigned long user_esp);
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extern unsigned long paging_init(unsigned long start_mem, unsigned long end_mem);
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extern void mem_init(unsigned long low_start_mem,
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unsigned long start_mem, unsigned long end_mem);
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extern void show_mem(void);
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extern void do_page_fault(unsigned long *esp, unsigned long error_code);
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extern void oom(struct task_struct * task);
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/* swap.c */
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extern void swap_free(unsigned int page_nr);
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extern void swap_duplicate(unsigned int page_nr);
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extern void swap_in(unsigned long *table_ptr);
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#define invalidate() \
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__asm__ __volatile__("movl %%cr3,%%eax\n\tmovl %%eax,%%cr3":::"ax")
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extern unsigned long high_memory;
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#define MAP_NR(addr) ((addr) >> PAGE_SHIFT)
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#define MAP_PAGE_RESERVED (1<<15)
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extern unsigned short * mem_map;
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#define PAGE_DIRTY 0x40
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#define PAGE_ACCESSED 0x20
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#define PAGE_USER 0x04
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#define PAGE_RW 0x02
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#define PAGE_PRESENT 0x01
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#define GFP_BUFFER 0x00
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#define GFP_ATOMIC 0x01
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#define GFP_USER 0x02
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#define GFP_KERNEL 0x03
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#endif
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