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1da177e4 LT |
1 | #ifndef _LINUX_MMAN_H |
2 | #define _LINUX_MMAN_H | |
3 | ||
9cdcb566 | 4 | #include <linux/mm.h> |
00a62ce9 | 5 | #include <linux/percpu_counter.h> |
9cdcb566 | 6 | |
60063497 | 7 | #include <linux/atomic.h> |
607ca46e | 8 | #include <uapi/linux/mman.h> |
9cdcb566 | 9 | |
1da177e4 LT |
10 | extern int sysctl_overcommit_memory; |
11 | extern int sysctl_overcommit_ratio; | |
49f0ce5f | 12 | extern unsigned long sysctl_overcommit_kbytes; |
00a62ce9 | 13 | extern struct percpu_counter vm_committed_as; |
1da177e4 | 14 | |
917d9290 TC |
15 | #ifdef CONFIG_SMP |
16 | extern s32 vm_committed_as_batch; | |
17 | #else | |
18 | #define vm_committed_as_batch 0 | |
19 | #endif | |
20 | ||
997071bc S |
21 | unsigned long vm_memory_committed(void); |
22 | ||
1da177e4 LT |
23 | static inline void vm_acct_memory(long pages) |
24 | { | |
917d9290 | 25 | __percpu_counter_add(&vm_committed_as, pages, vm_committed_as_batch); |
1da177e4 | 26 | } |
1da177e4 LT |
27 | |
28 | static inline void vm_unacct_memory(long pages) | |
29 | { | |
30 | vm_acct_memory(-pages); | |
31 | } | |
32 | ||
b845f313 DK |
33 | /* |
34 | * Allow architectures to handle additional protection bits | |
35 | */ | |
36 | ||
37 | #ifndef arch_calc_vm_prot_bits | |
38 | #define arch_calc_vm_prot_bits(prot) 0 | |
39 | #endif | |
40 | ||
41 | #ifndef arch_vm_get_page_prot | |
42 | #define arch_vm_get_page_prot(vm_flags) __pgprot(0) | |
43 | #endif | |
44 | ||
45 | #ifndef arch_validate_prot | |
46 | /* | |
47 | * This is called from mprotect(). PROT_GROWSDOWN and PROT_GROWSUP have | |
48 | * already been masked out. | |
49 | * | |
50 | * Returns true if the prot flags are valid | |
51 | */ | |
52 | static inline int arch_validate_prot(unsigned long prot) | |
53 | { | |
54 | return (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM)) == 0; | |
55 | } | |
56 | #define arch_validate_prot arch_validate_prot | |
57 | #endif | |
58 | ||
1da177e4 LT |
59 | /* |
60 | * Optimisation macro. It is equivalent to: | |
61 | * (x & bit1) ? bit2 : 0 | |
62 | * but this version is faster. | |
63 | * ("bit1" and "bit2" must be single bits) | |
64 | */ | |
65 | #define _calc_vm_trans(x, bit1, bit2) \ | |
66 | ((bit1) <= (bit2) ? ((x) & (bit1)) * ((bit2) / (bit1)) \ | |
67 | : ((x) & (bit1)) / ((bit1) / (bit2))) | |
68 | ||
69 | /* | |
70 | * Combine the mmap "prot" argument into "vm_flags" used internally. | |
71 | */ | |
72 | static inline unsigned long | |
73 | calc_vm_prot_bits(unsigned long prot) | |
74 | { | |
75 | return _calc_vm_trans(prot, PROT_READ, VM_READ ) | | |
76 | _calc_vm_trans(prot, PROT_WRITE, VM_WRITE) | | |
b845f313 DK |
77 | _calc_vm_trans(prot, PROT_EXEC, VM_EXEC) | |
78 | arch_calc_vm_prot_bits(prot); | |
1da177e4 LT |
79 | } |
80 | ||
81 | /* | |
82 | * Combine the mmap "flags" argument into "vm_flags" used internally. | |
83 | */ | |
84 | static inline unsigned long | |
85 | calc_vm_flag_bits(unsigned long flags) | |
86 | { | |
87 | return _calc_vm_trans(flags, MAP_GROWSDOWN, VM_GROWSDOWN ) | | |
88 | _calc_vm_trans(flags, MAP_DENYWRITE, VM_DENYWRITE ) | | |
09a9f1d2 | 89 | _calc_vm_trans(flags, MAP_LOCKED, VM_LOCKED ); |
1da177e4 | 90 | } |
00619bcc JM |
91 | |
92 | unsigned long vm_commit_limit(void); | |
1da177e4 | 93 | #endif /* _LINUX_MMAN_H */ |