| /* 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_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 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 */ |