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93 lines
2.3 KiB
93 lines
2.3 KiB
#ifndef _LINUX_MMAN_H |
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#define _LINUX_MMAN_H |
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#include <linux/mm.h> |
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#include <linux/percpu_counter.h> |
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#include <linux/atomic.h> |
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#include <uapi/linux/mman.h> |
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extern int sysctl_overcommit_memory; |
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extern int sysctl_overcommit_ratio; |
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extern unsigned long sysctl_overcommit_kbytes; |
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extern struct percpu_counter vm_committed_as; |
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#ifdef CONFIG_SMP |
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extern s32 vm_committed_as_batch; |
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#else |
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#define vm_committed_as_batch 0 |
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#endif |
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unsigned long vm_memory_committed(void); |
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static inline void vm_acct_memory(long pages) |
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{ |
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__percpu_counter_add(&vm_committed_as, pages, vm_committed_as_batch); |
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} |
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static inline void vm_unacct_memory(long pages) |
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{ |
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vm_acct_memory(-pages); |
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} |
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/* |
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* Allow architectures to handle additional protection bits |
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*/ |
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#ifndef arch_calc_vm_prot_bits |
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#define arch_calc_vm_prot_bits(prot) 0 |
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#endif |
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#ifndef arch_vm_get_page_prot |
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#define arch_vm_get_page_prot(vm_flags) __pgprot(0) |
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#endif |
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#ifndef arch_validate_prot |
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/* |
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* This is called from mprotect(). PROT_GROWSDOWN and PROT_GROWSUP have |
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* already been masked out. |
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* |
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* Returns true if the prot flags are valid |
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*/ |
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static inline int arch_validate_prot(unsigned long prot) |
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{ |
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return (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM)) == 0; |
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} |
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#define arch_validate_prot arch_validate_prot |
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#endif |
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/* |
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* Optimisation macro. It is equivalent to: |
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* (x & bit1) ? bit2 : 0 |
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* but this version is faster. |
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* ("bit1" and "bit2" must be single bits) |
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*/ |
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#define _calc_vm_trans(x, bit1, bit2) \ |
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((bit1) <= (bit2) ? ((x) & (bit1)) * ((bit2) / (bit1)) \ |
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: ((x) & (bit1)) / ((bit1) / (bit2))) |
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/* |
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* Combine the mmap "prot" argument into "vm_flags" used internally. |
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*/ |
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static inline unsigned long |
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calc_vm_prot_bits(unsigned long prot) |
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{ |
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return _calc_vm_trans(prot, PROT_READ, VM_READ ) | |
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_calc_vm_trans(prot, PROT_WRITE, VM_WRITE) | |
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_calc_vm_trans(prot, PROT_EXEC, VM_EXEC) | |
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arch_calc_vm_prot_bits(prot); |
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} |
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/* |
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* Combine the mmap "flags" argument into "vm_flags" used internally. |
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*/ |
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static inline unsigned long |
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calc_vm_flag_bits(unsigned long flags) |
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{ |
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return _calc_vm_trans(flags, MAP_GROWSDOWN, VM_GROWSDOWN ) | |
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_calc_vm_trans(flags, MAP_DENYWRITE, VM_DENYWRITE ) | |
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_calc_vm_trans(flags, MAP_LOCKED, VM_LOCKED ); |
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} |
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unsigned long vm_commit_limit(void); |
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#endif /* _LINUX_MMAN_H */
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