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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _LINUX_MMAN_H |
3 | #define _LINUX_MMAN_H | |
4 | ||
9cdcb566 | 5 | #include <linux/mm.h> |
00a62ce9 | 6 | #include <linux/percpu_counter.h> |
9cdcb566 | 7 | |
60063497 | 8 | #include <linux/atomic.h> |
607ca46e | 9 | #include <uapi/linux/mman.h> |
9cdcb566 | 10 | |
1c972597 DW |
11 | /* |
12 | * Arrange for legacy / undefined architecture specific flags to be | |
b6fb293f | 13 | * ignored by mmap handling code. |
1c972597 DW |
14 | */ |
15 | #ifndef MAP_32BIT | |
16 | #define MAP_32BIT 0 | |
17 | #endif | |
18 | #ifndef MAP_HUGE_2MB | |
19 | #define MAP_HUGE_2MB 0 | |
20 | #endif | |
21 | #ifndef MAP_HUGE_1GB | |
22 | #define MAP_HUGE_1GB 0 | |
23 | #endif | |
24 | #ifndef MAP_UNINITIALIZED | |
25 | #define MAP_UNINITIALIZED 0 | |
26 | #endif | |
b6fb293f JK |
27 | #ifndef MAP_SYNC |
28 | #define MAP_SYNC 0 | |
29 | #endif | |
1c972597 DW |
30 | |
31 | /* | |
32 | * The historical set of flags that all mmap implementations implicitly | |
33 | * support when a ->mmap_validate() op is not provided in file_operations. | |
34 | */ | |
35 | #define LEGACY_MAP_MASK (MAP_SHARED \ | |
36 | | MAP_PRIVATE \ | |
37 | | MAP_FIXED \ | |
38 | | MAP_ANONYMOUS \ | |
39 | | MAP_DENYWRITE \ | |
40 | | MAP_EXECUTABLE \ | |
41 | | MAP_UNINITIALIZED \ | |
42 | | MAP_GROWSDOWN \ | |
43 | | MAP_LOCKED \ | |
44 | | MAP_NORESERVE \ | |
45 | | MAP_POPULATE \ | |
46 | | MAP_NONBLOCK \ | |
47 | | MAP_STACK \ | |
48 | | MAP_HUGETLB \ | |
49 | | MAP_32BIT \ | |
50 | | MAP_HUGE_2MB \ | |
51 | | MAP_HUGE_1GB) | |
52 | ||
1da177e4 LT |
53 | extern int sysctl_overcommit_memory; |
54 | extern int sysctl_overcommit_ratio; | |
49f0ce5f | 55 | extern unsigned long sysctl_overcommit_kbytes; |
00a62ce9 | 56 | extern struct percpu_counter vm_committed_as; |
1da177e4 | 57 | |
917d9290 TC |
58 | #ifdef CONFIG_SMP |
59 | extern s32 vm_committed_as_batch; | |
60 | #else | |
61 | #define vm_committed_as_batch 0 | |
62 | #endif | |
63 | ||
997071bc S |
64 | unsigned long vm_memory_committed(void); |
65 | ||
1da177e4 LT |
66 | static inline void vm_acct_memory(long pages) |
67 | { | |
104b4e51 | 68 | percpu_counter_add_batch(&vm_committed_as, pages, vm_committed_as_batch); |
1da177e4 | 69 | } |
1da177e4 LT |
70 | |
71 | static inline void vm_unacct_memory(long pages) | |
72 | { | |
73 | vm_acct_memory(-pages); | |
74 | } | |
75 | ||
b845f313 DK |
76 | /* |
77 | * Allow architectures to handle additional protection bits | |
78 | */ | |
79 | ||
80 | #ifndef arch_calc_vm_prot_bits | |
e6bfb709 | 81 | #define arch_calc_vm_prot_bits(prot, pkey) 0 |
b845f313 DK |
82 | #endif |
83 | ||
84 | #ifndef arch_vm_get_page_prot | |
85 | #define arch_vm_get_page_prot(vm_flags) __pgprot(0) | |
86 | #endif | |
87 | ||
88 | #ifndef arch_validate_prot | |
89 | /* | |
90 | * This is called from mprotect(). PROT_GROWSDOWN and PROT_GROWSUP have | |
91 | * already been masked out. | |
92 | * | |
93 | * Returns true if the prot flags are valid | |
94 | */ | |
9035cf9a | 95 | static inline bool arch_validate_prot(unsigned long prot, unsigned long addr) |
b845f313 DK |
96 | { |
97 | return (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM)) == 0; | |
98 | } | |
99 | #define arch_validate_prot arch_validate_prot | |
100 | #endif | |
101 | ||
1da177e4 LT |
102 | /* |
103 | * Optimisation macro. It is equivalent to: | |
104 | * (x & bit1) ? bit2 : 0 | |
105 | * but this version is faster. | |
106 | * ("bit1" and "bit2" must be single bits) | |
107 | */ | |
108 | #define _calc_vm_trans(x, bit1, bit2) \ | |
592e2545 | 109 | ((!(bit1) || !(bit2)) ? 0 : \ |
1da177e4 | 110 | ((bit1) <= (bit2) ? ((x) & (bit1)) * ((bit2) / (bit1)) \ |
592e2545 | 111 | : ((x) & (bit1)) / ((bit1) / (bit2)))) |
1da177e4 LT |
112 | |
113 | /* | |
114 | * Combine the mmap "prot" argument into "vm_flags" used internally. | |
115 | */ | |
116 | static inline unsigned long | |
e6bfb709 | 117 | calc_vm_prot_bits(unsigned long prot, unsigned long pkey) |
1da177e4 LT |
118 | { |
119 | return _calc_vm_trans(prot, PROT_READ, VM_READ ) | | |
120 | _calc_vm_trans(prot, PROT_WRITE, VM_WRITE) | | |
b845f313 | 121 | _calc_vm_trans(prot, PROT_EXEC, VM_EXEC) | |
e6bfb709 | 122 | arch_calc_vm_prot_bits(prot, pkey); |
1da177e4 LT |
123 | } |
124 | ||
125 | /* | |
126 | * Combine the mmap "flags" argument into "vm_flags" used internally. | |
127 | */ | |
128 | static inline unsigned long | |
129 | calc_vm_flag_bits(unsigned long flags) | |
130 | { | |
131 | return _calc_vm_trans(flags, MAP_GROWSDOWN, VM_GROWSDOWN ) | | |
132 | _calc_vm_trans(flags, MAP_DENYWRITE, VM_DENYWRITE ) | | |
b6fb293f JK |
133 | _calc_vm_trans(flags, MAP_LOCKED, VM_LOCKED ) | |
134 | _calc_vm_trans(flags, MAP_SYNC, VM_SYNC ); | |
1da177e4 | 135 | } |
00619bcc JM |
136 | |
137 | unsigned long vm_commit_limit(void); | |
1da177e4 | 138 | #endif /* _LINUX_MMAN_H */ |