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161 lines
3.9 KiB
161 lines
3.9 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#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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/* |
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* Arrange for legacy / undefined architecture specific flags to be |
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* ignored by mmap handling code. |
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*/ |
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#ifndef MAP_32BIT |
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#define MAP_32BIT 0 |
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#endif |
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#ifndef MAP_HUGE_2MB |
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#define MAP_HUGE_2MB 0 |
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#endif |
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#ifndef MAP_HUGE_1GB |
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#define MAP_HUGE_1GB 0 |
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#endif |
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#ifndef MAP_UNINITIALIZED |
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#define MAP_UNINITIALIZED 0 |
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#endif |
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#ifndef MAP_SYNC |
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#define MAP_SYNC 0 |
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#endif |
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/* |
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* The historical set of flags that all mmap implementations implicitly |
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* support when a ->mmap_validate() op is not provided in file_operations. |
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*/ |
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#define LEGACY_MAP_MASK (MAP_SHARED \ |
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| MAP_PRIVATE \ |
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| MAP_FIXED \ |
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| MAP_ANONYMOUS \ |
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| MAP_DENYWRITE \ |
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| MAP_EXECUTABLE \ |
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| MAP_UNINITIALIZED \ |
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| MAP_GROWSDOWN \ |
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| MAP_LOCKED \ |
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| MAP_NORESERVE \ |
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| MAP_POPULATE \ |
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| MAP_NONBLOCK \ |
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| MAP_STACK \ |
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| MAP_HUGETLB \ |
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| MAP_32BIT \ |
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| MAP_HUGE_2MB \ |
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| MAP_HUGE_1GB) |
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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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extern void mm_compute_batch(int overcommit_policy); |
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#else |
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#define vm_committed_as_batch 0 |
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static inline void mm_compute_batch(int overcommit_policy) |
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{ |
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} |
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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_batch(&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 and flag bits. The |
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* overriding macros must be defined in the arch-specific asm/mman.h file. |
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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, pkey) 0 |
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#endif |
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#ifndef arch_calc_vm_flag_bits |
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#define arch_calc_vm_flag_bits(flags) 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 bool arch_validate_prot(unsigned long prot, unsigned long addr) |
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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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#ifndef arch_validate_flags |
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/* |
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* This is called from mmap() and mprotect() with the updated vma->vm_flags. |
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* |
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* Returns true if the VM_* flags are valid. |
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*/ |
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static inline bool arch_validate_flags(unsigned long flags) |
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{ |
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return true; |
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} |
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#define arch_validate_flags arch_validate_flags |
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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)) ? 0 : \ |
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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, unsigned long pkey) |
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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, pkey); |
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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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_calc_vm_trans(flags, MAP_SYNC, VM_SYNC ) | |
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arch_calc_vm_flag_bits(flags); |
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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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