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