#ifndef _LINUX_MMAN_H #define _LINUX_MMAN_H #include <asm/mman.h> #define MREMAP_MAYMOVE 1 #define MREMAP_FIXED 2 #define OVERCOMMIT_GUESS 0 #define OVERCOMMIT_ALWAYS 1 #define OVERCOMMIT_NEVER 2 #ifdef __KERNEL__ #include <linux/mm.h> #include <linux/percpu_counter.h> #include <linux/atomic.h> extern int sysctl_overcommit_memory; extern int sysctl_overcommit_ratio; extern struct percpu_counter vm_committed_as; static inline void vm_acct_memory(long pages) { percpu_counter_add(&vm_committed_as, pages); } static inline void vm_unacct_memory(long pages) { vm_acct_memory(-pages); } /* * Allow architectures to handle additional protection bits */ #ifndef arch_calc_vm_prot_bits #define arch_calc_vm_prot_bits(prot) 0 #endif #ifndef arch_vm_get_page_prot #define arch_vm_get_page_prot(vm_flags) __pgprot(0) #endif #ifndef arch_validate_prot /* * This is called from mprotect(). PROT_GROWSDOWN and PROT_GROWSUP have * already been masked out. * * Returns true if the prot flags are valid */ static inline int arch_validate_prot(unsigned long prot) { return (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM)) == 0; } #define arch_validate_prot arch_validate_prot #endif /* * Optimisation macro. It is equivalent to: * (x & bit1) ? bit2 : 0 * but this version is faster. * ("bit1" and "bit2" must be single bits) */ #define _calc_vm_trans(x, bit1, bit2) \ ((bit1) <= (bit2) ? ((x) & (bit1)) * ((bit2) / (bit1)) \ : ((x) & (bit1)) / ((bit1) / (bit2))) /* * Combine the mmap "prot" argument into "vm_flags" used internally. */ static inline unsigned long calc_vm_prot_bits(unsigned long prot) { return _calc_vm_trans(prot, PROT_READ, VM_READ ) | _calc_vm_trans(prot, PROT_WRITE, VM_WRITE) | _calc_vm_trans(prot, PROT_EXEC, VM_EXEC) | arch_calc_vm_prot_bits(prot); } /* * Combine the mmap "flags" argument into "vm_flags" used internally. */ static inline unsigned long calc_vm_flag_bits(unsigned long flags) { return _calc_vm_trans(flags, MAP_GROWSDOWN, VM_GROWSDOWN ) | _calc_vm_trans(flags, MAP_DENYWRITE, VM_DENYWRITE ) | _calc_vm_trans(flags, MAP_EXECUTABLE, VM_EXECUTABLE) | _calc_vm_trans(flags, MAP_LOCKED, VM_LOCKED ); } #endif /* __KERNEL__ */ #endif /* _LINUX_MMAN_H */