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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | #ifndef _LINUX_MMAN_H |
| 2 | #define _LINUX_MMAN_H |
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| 3 | |||
| 4 | #include <linux/config.h> |
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| 5 | #include <linux/mm.h> |
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| 6 | |||
| 7 | #include <asm/atomic.h> |
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| 8 | #include <asm/mman.h> |
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| 9 | |||
| 10 | #define MREMAP_MAYMOVE 1 |
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| 11 | #define MREMAP_FIXED 2 |
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| 12 | |||
| 13 | extern int sysctl_overcommit_memory; |
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| 14 | extern int sysctl_overcommit_ratio; |
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| 15 | extern atomic_t vm_committed_space; |
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| 16 | |||
| 17 | #ifdef CONFIG_SMP |
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| 18 | extern void vm_acct_memory(long pages); |
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| 19 | #else |
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| 20 | static inline void vm_acct_memory(long pages) |
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| 21 | { |
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| 22 | atomic_add(pages, &vm_committed_space); |
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| 23 | } |
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| 24 | #endif |
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| 25 | |||
| 26 | static inline void vm_unacct_memory(long pages) |
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| 27 | { |
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| 28 | vm_acct_memory(-pages); |
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| 29 | } |
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| 30 | |||
| 31 | /* |
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| 32 | * Optimisation macro. It is equivalent to: |
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| 33 | * (x & bit1) ? bit2 : 0 |
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| 34 | * but this version is faster. |
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| 35 | * ("bit1" and "bit2" must be single bits) |
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| 36 | */ |
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| 37 | #define _calc_vm_trans(x, bit1, bit2) \ |
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| 38 | ((bit1) <= (bit2) ? ((x) & (bit1)) * ((bit2) / (bit1)) \ |
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| 39 | : ((x) & (bit1)) / ((bit1) / (bit2))) |
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| 40 | |||
| 41 | /* |
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| 42 | * Combine the mmap "prot" argument into "vm_flags" used internally. |
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| 43 | */ |
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| 44 | static inline unsigned long |
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| 45 | calc_vm_prot_bits(unsigned long prot) |
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| 46 | { |
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| 47 | return _calc_vm_trans(prot, PROT_READ, VM_READ ) | |
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| 48 | _calc_vm_trans(prot, PROT_WRITE, VM_WRITE) | |
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| 49 | _calc_vm_trans(prot, PROT_EXEC, VM_EXEC ); |
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| 50 | } |
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| 51 | |||
| 52 | /* |
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| 53 | * Combine the mmap "flags" argument into "vm_flags" used internally. |
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| 54 | */ |
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| 55 | static inline unsigned long |
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| 56 | calc_vm_flag_bits(unsigned long flags) |
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| 57 | { |
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| 58 | return _calc_vm_trans(flags, MAP_GROWSDOWN, VM_GROWSDOWN ) | |
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| 59 | _calc_vm_trans(flags, MAP_DENYWRITE, VM_DENYWRITE ) | |
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| 60 | _calc_vm_trans(flags, MAP_EXECUTABLE, VM_EXECUTABLE) | |
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| 61 | _calc_vm_trans(flags, MAP_LOCKED, VM_LOCKED ); |
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| 62 | } |
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| 63 | |||
| 64 | #endif /* _LINUX_MMAN_H */ |