196 lines
6.5 KiB
C
196 lines
6.5 KiB
C
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#ifndef _LINUX_MM_H
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#define _LINUX_MM_H
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#include <linux/page.h>
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#include <linux/sched.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#define VERIFY_READ 0
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#define VERIFY_WRITE 1
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int __verify_write(unsigned long addr, unsigned long count);
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extern inline int verify_area(int type, void * addr, unsigned long size)
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{
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if (TASK_SIZE <= (unsigned long) addr)
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return -EFAULT;
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if (size > TASK_SIZE - (unsigned long) addr)
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return -EFAULT;
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if (wp_works_ok || type == VERIFY_READ || !size)
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return 0;
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return __verify_write((unsigned long) addr,size);
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}
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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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unsigned short vm_page_prot;
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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)(int error_code,
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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 * from, struct vm_area_struct * to, unsigned long address);
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int (*unmap)(struct vm_area_struct *area, unsigned long, size_t);
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};
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extern unsigned long __bad_page(void);
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extern unsigned long __bad_pagetable(void);
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extern unsigned long __zero_page(void);
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#define BAD_PAGETABLE __bad_pagetable()
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#define BAD_PAGE __bad_page()
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#define ZERO_PAGE __zero_page()
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extern volatile short free_page_ptr; /* used by malloc and tcp/ip. */
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extern int nr_swap_pages;
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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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/*
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* This is timing-critical - most of the time in getting a new page
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* goes to clearing the page. If you want a page without the clearing
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* overhead, just use __get_free_page() directly..
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*/
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extern unsigned long __get_free_page(int priority);
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extern inline unsigned long get_free_page(int priority)
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{
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unsigned long page;
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page = __get_free_page(priority);
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if (page)
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__asm__ __volatile__("rep ; stosl"
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: /* no outputs */ \
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:"a" (0),"c" (1024),"D" (page)
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:"di","cx");
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return page;
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}
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/* memory.c */
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extern void free_page(unsigned long addr);
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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_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 * to);
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extern int clone_page_tables(struct task_struct * to);
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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, int mask);
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extern int zeromap_page_range(unsigned long from, unsigned long size, int mask);
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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 oom(struct task_struct * task);
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extern void si_meminfo(struct sysinfo * val);
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/* vmalloc.c */
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extern void * vmalloc(unsigned long size);
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extern void vfree(void * addr);
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extern int vread(char *buf, char *addr, int count);
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/* swap.c */
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extern void swap_free(unsigned long page_nr);
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extern unsigned long swap_duplicate(unsigned long page_nr);
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extern void swap_in(unsigned long *table_ptr);
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extern void si_swapinfo(struct sysinfo * val);
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extern void rw_swap_page(int rw, unsigned long nr, char * buf);
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/* mmap.c */
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extern int do_mmap(struct file * file, unsigned long addr, unsigned long len,
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unsigned long prot, unsigned long flags, unsigned long off);
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typedef int (*map_mergep_fnp)(const struct vm_area_struct *,
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const struct vm_area_struct *, void *);
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extern void merge_segments(struct vm_area_struct *, map_mergep_fnp, void *);
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extern void insert_vm_struct(struct task_struct *, struct vm_area_struct *);
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extern int ignoff_mergep(const struct vm_area_struct *,
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const struct vm_area_struct *, void *);
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extern int do_munmap(unsigned long, size_t);
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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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#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_PRESENT 0x001
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#define PAGE_RW 0x002
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#define PAGE_USER 0x004
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#define PAGE_PWT 0x008 /* 486 only - not used currently */
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#define PAGE_PCD 0x010 /* 486 only - not used currently */
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#define PAGE_ACCESSED 0x020
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#define PAGE_DIRTY 0x040
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#define PAGE_COW 0x200 /* implemented in software (one of the AVL bits) */
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#define PAGE_PRIVATE (PAGE_PRESENT | PAGE_RW | PAGE_USER | PAGE_ACCESSED | PAGE_COW)
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#define PAGE_SHARED (PAGE_PRESENT | PAGE_RW | PAGE_USER | PAGE_ACCESSED)
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#define PAGE_COPY (PAGE_PRESENT | PAGE_USER | PAGE_ACCESSED | PAGE_COW)
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#define PAGE_READONLY (PAGE_PRESENT | PAGE_USER | PAGE_ACCESSED)
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#define PAGE_TABLE (PAGE_PRESENT | PAGE_RW | PAGE_USER | PAGE_ACCESSED)
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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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/* vm_ops not present page codes */
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#define SHM_SWP_TYPE 0x41
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extern void shm_no_page (ulong *);
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#endif
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