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40 | * |
40 | * |
41 | * @param val Where to add. |
41 | * @param val Where to add. |
42 | * @param i Value to be added. |
42 | * @param i Value to be added. |
43 | * |
43 | * |
44 | * @return Value after addition. |
44 | * @return Value after addition. |
- | 45 | * |
|
45 | */ |
46 | */ |
46 | static inline long atomic_add(atomic_t *val, int i) |
47 | static inline long atomic_add(atomic_t *val, int i) |
47 | { |
48 | { |
48 | int ret; |
49 | int ret; |
49 | volatile long *mem = &(val->count); |
50 | volatile long *mem = &(val->count); |
50 | 51 | ||
51 | asm volatile ( |
52 | asm volatile ( |
52 | "1:\n" |
53 | "1:\n" |
53 | "ldr r2, [%1] \n" |
54 | "ldr r2, [%[mem]]\n" |
54 | "add r3, r2, %2 \n" |
55 | "add r3, r2, %[i]\n" |
55 | "str r3, %0 \n" |
56 | "str r3, %[ret]\n" |
56 | "swp r3, r3, [%1] \n" |
57 | "swp r3, r3, [%[mem]]\n" |
57 | "cmp r3, r2 \n" |
58 | "cmp r3, r2\n" |
58 | "bne 1b \n" |
59 | "bne 1b\n" |
59 | - | ||
60 | : "=m" (ret) |
60 | : [ret] "=m" (ret) |
61 | : "r" (mem), "r" (i) |
61 | : [mem] "r" (mem), [i] "r" (i) |
62 | : "r3", "r2" |
62 | : "r3", "r2" |
63 | ); |
63 | ); |
64 | 64 | ||
65 | return ret; |
65 | return ret; |
66 | } |
66 | } |