slab: Support 'no-touch' caches
[akaros.git] / kern / include / bitmask.h
1 #pragma once
2
3 #include <arch/bitmask.h>
4
5 static inline bool BITMASK_IS_SET_IN_RANGE(uint8_t* m, size_t beg, size_t end)
6 {
7         for(size_t i=beg; i<end; i++) {
8                 if(!GET_BITMASK_BIT(m, i))
9                         return FALSE;
10         }
11         return TRUE;
12 }
13
14 static inline bool BITMASK_IS_CLR_IN_RANGE(uint8_t* m, size_t beg, size_t end)
15 {
16         for(size_t i=beg; i<end; i++) {
17                 if(GET_BITMASK_BIT(m, i))
18                         return FALSE;
19         }
20         return TRUE;
21 }
22
23 static inline void SET_BITMASK_RANGE(uint8_t* m, size_t beg, size_t end)
24 {
25         for(size_t i=beg; i<end; i++) {
26                 SET_BITMASK_BIT(m, i);
27         }
28 }
29
30 static inline void CLR_BITMASK_RANGE(uint8_t* m, size_t beg, size_t end)
31 {
32         for(size_t i=beg; i<end; i++) {
33                 CLR_BITMASK_BIT(m, i);
34         }
35 }
36
37 /* Runs *work on every bit in the bitmask, passing *work the value of the bit
38  * that is set.  Optionally clears the bit from the bitmask.
39  *
40  * We need this to be a macro, so that the calling code doesn't need the
41  * address for work_fn.  This matters for code that has nested functions that
42  * use local variables, since taking the address of work_fn will force the
43  * compiler to put the function on the stack and incur icache coherency
44  * overheads. */
45 #define BITMASK_FOREACH_SET(name, size, work_fn, clear)                        \
46 {                                                                              \
47         for (int i = 0; i < (size); i++) {                                         \
48                 bool present = GET_BITMASK_BIT((name), i);                             \
49                 if (present && (clear))                                                \
50                         CLR_BITMASK_BIT_ATOMIC((name), i);                                 \
51                 if (present)                                                           \
52                         (work_fn)(i);                                                      \
53         }                                                                          \
54 }