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