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- /* SPDX-License-Identifier: GPL-2.0 */
- #ifndef _LINUX_MMAN_H
- #define _LINUX_MMAN_H
- #include <linux/mm.h>
- #include <linux/percpu_counter.h>
- #include <linux/atomic.h>
- #include <uapi/linux/mman.h>
- /*
- * Arrange for legacy / undefined architecture specific flags to be
- * ignored by mmap handling code.
- */
- #ifndef MAP_32BIT
- #define MAP_32BIT 0
- #endif
- #ifndef MAP_HUGE_2MB
- #define MAP_HUGE_2MB 0
- #endif
- #ifndef MAP_HUGE_1GB
- #define MAP_HUGE_1GB 0
- #endif
- #ifndef MAP_UNINITIALIZED
- #define MAP_UNINITIALIZED 0
- #endif
- #ifndef MAP_SYNC
- #define MAP_SYNC 0
- #endif
- /*
- * The historical set of flags that all mmap implementations implicitly
- * support when a ->mmap_validate() op is not provided in file_operations.
- *
- * MAP_EXECUTABLE and MAP_DENYWRITE are completely ignored throughout the
- * kernel.
- */
- #define LEGACY_MAP_MASK (MAP_SHARED \
- | MAP_PRIVATE \
- | MAP_FIXED \
- | MAP_ANONYMOUS \
- | MAP_DENYWRITE \
- | MAP_EXECUTABLE \
- | MAP_UNINITIALIZED \
- | MAP_GROWSDOWN \
- | MAP_LOCKED \
- | MAP_NORESERVE \
- | MAP_POPULATE \
- | MAP_NONBLOCK \
- | MAP_STACK \
- | MAP_HUGETLB \
- | MAP_32BIT \
- | MAP_HUGE_2MB \
- | MAP_HUGE_1GB)
- extern int sysctl_overcommit_memory;
- extern int sysctl_overcommit_ratio;
- extern unsigned long sysctl_overcommit_kbytes;
- extern struct percpu_counter vm_committed_as;
- #ifdef CONFIG_SMP
- extern s32 vm_committed_as_batch;
- extern void mm_compute_batch(int overcommit_policy);
- #else
- #define vm_committed_as_batch 0
- static inline void mm_compute_batch(int overcommit_policy)
- {
- }
- #endif
- unsigned long vm_memory_committed(void);
- static inline void vm_acct_memory(long pages)
- {
- percpu_counter_add_batch(&vm_committed_as, pages, vm_committed_as_batch);
- }
- static inline void vm_unacct_memory(long pages)
- {
- vm_acct_memory(-pages);
- }
- /*
- * Allow architectures to handle additional protection and flag bits. The
- * overriding macros must be defined in the arch-specific asm/mman.h file.
- */
- #ifndef arch_calc_vm_prot_bits
- #define arch_calc_vm_prot_bits(prot, pkey) 0
- #endif
- #ifndef arch_calc_vm_flag_bits
- #define arch_calc_vm_flag_bits(flags) 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 bool arch_validate_prot(unsigned long prot, unsigned long addr)
- {
- return (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM)) == 0;
- }
- #define arch_validate_prot arch_validate_prot
- #endif
- #ifndef arch_validate_flags
- /*
- * This is called from mmap() and mprotect() with the updated vma->vm_flags.
- *
- * Returns true if the VM_* flags are valid.
- */
- static inline bool arch_validate_flags(unsigned long flags)
- {
- return true;
- }
- #define arch_validate_flags arch_validate_flags
- #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)) ? 0 : \
- ((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, unsigned long pkey)
- {
- 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, pkey);
- }
- /*
- * 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_LOCKED, VM_LOCKED ) |
- _calc_vm_trans(flags, MAP_SYNC, VM_SYNC ) |
- arch_calc_vm_flag_bits(flags);
- }
- unsigned long vm_commit_limit(void);
- #endif /* _LINUX_MMAN_H */
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