source: cmedia/trunk/Include/Linux/mm.h@ 559

Last change on this file since 559 was 354, checked in by stevenhl, 17 years ago

Import untested baseline cmedia sources, work products and binaries
Binaries and work products should be deleted from repository.
once new builds are verified to work.
File size: 4.1 KB
Line 
1/* $Id: mm.h,v 1.2 2000/07/23 16:21:55 sandervl Exp $ */
2
3#ifndef _LINUX_MM_H
4#define _LINUX_MM_H
5
6#include <linux/sched.h>
7#include <linux/errno.h>
8#include <asm/page.h>
9#include <asm/atomic.h>
10
11/*
12 * GFP bitmasks..
13 */
14#define __GFP_WAIT 0x01
15#define __GFP_LOW 0x02
16#define __GFP_MED 0x04
17#define __GFP_HIGH 0x08
18#define __GFP_IO 0x10
19#define __GFP_SWAP 0x20
20#ifdef CONFIG_HIGHMEM
21#define __GFP_HIGHMEM 0x40
22#else
23#define __GFP_HIGHMEM 0x0 /* noop */
24#endif
25
26#define __GFP_DMA 0x80
27
28#define GFP_BUFFER (__GFP_LOW | __GFP_WAIT)
29#define GFP_ATOMIC (__GFP_HIGH)
30#define GFP_USER (__GFP_LOW | __GFP_WAIT | __GFP_IO)
31#define GFP_HIGHUSER (GFP_USER | __GFP_HIGHMEM)
32#define GFP_KERNEL (__GFP_MED | __GFP_WAIT | __GFP_IO)
33#define GFP_NFS (__GFP_HIGH | __GFP_WAIT | __GFP_IO)
34#define GFP_KSWAPD (__GFP_IO | __GFP_SWAP)
35
36/* Flag - indicates that the buffer will be suitable for DMA. Ignored on some
37 platforms, used as appropriate on others */
38
39#define GFP_DMA __GFP_DMA
40
41/* Flag - indicates that the buffer can be taken from high memory which is not
42 directly addressable by the kernel */
43
44#define GFP_HIGHMEM __GFP_HIGHMEM
45
46/*
47 * This struct defines a memory VMM memory area. There is one of these
48 * per VM-area/task. A VM area is any part of the process virtual memory
49 * space that has a special rule for the page-fault handlers (ie a shared
50 * library, the executable area etc).
51 */
52struct vm_area_struct {
53 struct mm_struct * vm_mm; /* VM area parameters */
54 unsigned long vm_start;
55 unsigned long vm_end;
56
57 /* linked list of VM areas per task, sorted by address */
58 struct vm_area_struct *vm_next;
59
60 pgprot_t vm_page_prot;
61 unsigned short vm_flags;
62
63 /* AVL tree of VM areas per task, sorted by address */
64 short vm_avl_height;
65 struct vm_area_struct * vm_avl_left;
66 struct vm_area_struct * vm_avl_right;
67
68 /* For areas with inode, the list inode->i_mmap, for shm areas,
69 * the list of attaches, otherwise unused.
70 */
71 struct vm_area_struct *vm_next_share;
72 struct vm_area_struct **vm_pprev_share;
73
74 struct vm_operations_struct * vm_ops;
75 unsigned long vm_pgoff; /* offset in PAGE_SIZE units, *not* PAGE_CACHE_SIZE */
76 struct file * vm_file;
77 void * vm_private_data; /* was vm_pte (shared mem) */
78};
79
80/*
81 * vm_flags..
82 */
83#define VM_READ 0x0001 /* currently active flags */
84#define VM_WRITE 0x0002
85#define VM_EXEC 0x0004
86#define VM_SHARED 0x0008
87
88#define VM_MAYREAD 0x0010 /* limits for mprotect() etc */
89#define VM_MAYWRITE 0x0020
90#define VM_MAYEXEC 0x0040
91#define VM_MAYSHARE 0x0080
92
93#define VM_GROWSDOWN 0x0100 /* general info on the segment */
94#define VM_GROWSUP 0x0200
95#define VM_SHM 0x0400 /* shared memory area, don't swap out */
96#define VM_DENYWRITE 0x0800 /* ETXTBSY on write attempts.. */
97
98#define VM_EXECUTABLE 0x1000
99#define VM_LOCKED 0x2000
100#define VM_IO 0x4000 /* Memory mapped I/O or similar */
101
102#define VM_STACK_FLAGS 0x0177
103
104/* Page flag bit values */
105#define PG_locked 0
106#define PG_error 1
107#define PG_referenced 2
108#define PG_uptodate 3
109#define PG_decr_after 5
110#define PG_DMA 7
111#define PG_slab 8
112#define PG_swap_cache 9
113#define PG_skip 10
114#define PG_swap_entry 11
115#define PG_highmem 12
116 /* bits 21-30 unused */
117#define PG_reserved 31
118
119typedef struct page {
120 unsigned long index;
121 atomic_t count;
122 unsigned long flags; /* atomic flags, some possibly updated asynchronously */
123 unsigned long virtual; /* nonzero if kmapped */
124} mem_map_t;
125
126extern mem_map_t * mem_map;
127
128#define free_page(addr) free_pages((addr),0)
129extern int free_pages(unsigned long addr, unsigned long order);
130
131#define virt_to_bus virt_to_phys
132extern unsigned long virt_to_phys(void * address);
133
134extern void * phys_to_virt(unsigned long address);
135
136#define __get_free_page(gfp_mask) __get_free_pages((gfp_mask),0)
137#define __get_dma_pages(gfp_mask, order) __get_free_pages((gfp_mask) | GFP_DMA,(order))
138
139extern void *__get_free_pages(int gfp_mask, unsigned long order);
140extern struct page * alloc_pages(int gfp_mask, unsigned long order);
141
142extern int remap_page_range(unsigned long from, unsigned long to, unsigned long size, pgprot_t prot);
143
144#endif
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