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