1 f15cbe6fSPaul Mundt #ifndef __ASM_SH_ATOMIC_LLSC_H 2 f15cbe6fSPaul Mundt #define __ASM_SH_ATOMIC_LLSC_H 3 f15cbe6fSPaul Mundt 4 f15cbe6fSPaul Mundt /* 5 f15cbe6fSPaul Mundt * SH-4A note: 6 f15cbe6fSPaul Mundt * 7 f15cbe6fSPaul Mundt * We basically get atomic_xxx_return() for free compared with 8 f15cbe6fSPaul Mundt * atomic_xxx(). movli.l/movco.l require r0 due to the instruction 9 f15cbe6fSPaul Mundt * encoding, so the retval is automatically set without having to 10 f15cbe6fSPaul Mundt * do any special work. 11 f15cbe6fSPaul Mundt */ 12 *c6470150SPeter Zijlstra /* 13 *c6470150SPeter Zijlstra * To get proper branch prediction for the main line, we must branch 14 *c6470150SPeter Zijlstra * forward to code at the end of this object's .text section, then 15 *c6470150SPeter Zijlstra * branch back to restart the operation. 16 *c6470150SPeter Zijlstra */ 17 f15cbe6fSPaul Mundt 18 *c6470150SPeter Zijlstra #define ATOMIC_OP(op) \ 19 *c6470150SPeter Zijlstra static inline void atomic_##op(int i, atomic_t *v) \ 20 *c6470150SPeter Zijlstra { \ 21 *c6470150SPeter Zijlstra unsigned long tmp; \ 22 *c6470150SPeter Zijlstra \ 23 *c6470150SPeter Zijlstra __asm__ __volatile__ ( \ 24 *c6470150SPeter Zijlstra "1: movli.l @%2, %0 ! atomic_" #op "\n" \ 25 *c6470150SPeter Zijlstra " " #op " %1, %0 \n" \ 26 *c6470150SPeter Zijlstra " movco.l %0, @%2 \n" \ 27 *c6470150SPeter Zijlstra " bf 1b \n" \ 28 *c6470150SPeter Zijlstra : "=&z" (tmp) \ 29 *c6470150SPeter Zijlstra : "r" (i), "r" (&v->counter) \ 30 *c6470150SPeter Zijlstra : "t"); \ 31 f15cbe6fSPaul Mundt } 32 f15cbe6fSPaul Mundt 33 *c6470150SPeter Zijlstra #define ATOMIC_OP_RETURN(op) \ 34 *c6470150SPeter Zijlstra static inline int atomic_##op##_return(int i, atomic_t *v) \ 35 *c6470150SPeter Zijlstra { \ 36 *c6470150SPeter Zijlstra unsigned long temp; \ 37 *c6470150SPeter Zijlstra \ 38 *c6470150SPeter Zijlstra __asm__ __volatile__ ( \ 39 *c6470150SPeter Zijlstra "1: movli.l @%2, %0 ! atomic_" #op "_return \n" \ 40 *c6470150SPeter Zijlstra " " #op " %1, %0 \n" \ 41 *c6470150SPeter Zijlstra " movco.l %0, @%2 \n" \ 42 *c6470150SPeter Zijlstra " bf 1b \n" \ 43 *c6470150SPeter Zijlstra " synco \n" \ 44 *c6470150SPeter Zijlstra : "=&z" (temp) \ 45 *c6470150SPeter Zijlstra : "r" (i), "r" (&v->counter) \ 46 *c6470150SPeter Zijlstra : "t"); \ 47 *c6470150SPeter Zijlstra \ 48 *c6470150SPeter Zijlstra return temp; \ 49 f15cbe6fSPaul Mundt } 50 f15cbe6fSPaul Mundt 51 *c6470150SPeter Zijlstra #define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) 52 *c6470150SPeter Zijlstra 53 *c6470150SPeter Zijlstra ATOMIC_OPS(add) 54 *c6470150SPeter Zijlstra ATOMIC_OPS(sub) 55 *c6470150SPeter Zijlstra 56 *c6470150SPeter Zijlstra #undef ATOMIC_OPS 57 *c6470150SPeter Zijlstra #undef ATOMIC_OP_RETURN 58 *c6470150SPeter Zijlstra #undef ATOMIC_OP 59 *c6470150SPeter Zijlstra 60 f15cbe6fSPaul Mundt static inline void atomic_clear_mask(unsigned int mask, atomic_t *v) 61 f15cbe6fSPaul Mundt { 62 f15cbe6fSPaul Mundt unsigned long tmp; 63 f15cbe6fSPaul Mundt 64 f15cbe6fSPaul Mundt __asm__ __volatile__ ( 65 f15cbe6fSPaul Mundt "1: movli.l @%2, %0 ! atomic_clear_mask \n" 66 f15cbe6fSPaul Mundt " and %1, %0 \n" 67 f15cbe6fSPaul Mundt " movco.l %0, @%2 \n" 68 f15cbe6fSPaul Mundt " bf 1b \n" 69 f15cbe6fSPaul Mundt : "=&z" (tmp) 70 f15cbe6fSPaul Mundt : "r" (~mask), "r" (&v->counter) 71 f15cbe6fSPaul Mundt : "t"); 72 f15cbe6fSPaul Mundt } 73 f15cbe6fSPaul Mundt 74 f15cbe6fSPaul Mundt static inline void atomic_set_mask(unsigned int mask, atomic_t *v) 75 f15cbe6fSPaul Mundt { 76 f15cbe6fSPaul Mundt unsigned long tmp; 77 f15cbe6fSPaul Mundt 78 f15cbe6fSPaul Mundt __asm__ __volatile__ ( 79 f15cbe6fSPaul Mundt "1: movli.l @%2, %0 ! atomic_set_mask \n" 80 f15cbe6fSPaul Mundt " or %1, %0 \n" 81 f15cbe6fSPaul Mundt " movco.l %0, @%2 \n" 82 f15cbe6fSPaul Mundt " bf 1b \n" 83 f15cbe6fSPaul Mundt : "=&z" (tmp) 84 f15cbe6fSPaul Mundt : "r" (mask), "r" (&v->counter) 85 f15cbe6fSPaul Mundt : "t"); 86 f15cbe6fSPaul Mundt } 87 f15cbe6fSPaul Mundt 88 f15cbe6fSPaul Mundt #endif /* __ASM_SH_ATOMIC_LLSC_H */ 89