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  • uspace/lib/c/arch/arm32/src/atomic.c

    rae787807 r56210a7  
    3838volatile unsigned *ras_page;
    3939
    40 unsigned long long __atomic_load_8(const volatile void *mem0, int model)
    41 {
    42         const volatile unsigned long long *mem = mem0;
    43 
    44         (void) model;
    45 
    46         unsigned long long ret;
    47 
    48         /*
    49          * The following instructions between labels 1 and 2 constitute a
    50          * Restartable Atomic Seqeunce. Should the sequence be non-atomic,
    51          * the kernel will restart it.
    52          */
    53         asm volatile (
    54             "1:\n"
    55             "   adr %[ret], 1b\n"
    56             "   str %[ret], %[rp0]\n"
    57             "   adr %[ret], 2f\n"
    58             "   str %[ret], %[rp1]\n"
    59 
    60             "   ldrd %[ret], %[addr]\n"
    61             "2:\n"
    62             : [ret] "=&r" (ret),
    63               [rp0] "=m" (ras_page[0]),
    64               [rp1] "=m" (ras_page[1])
    65             : [addr] "m" (*mem)
    66         );
    67 
    68         ras_page[0] = 0;
    69         ras_page[1] = 0xffffffff;
    70 
    71         return ret;
    72 }
    73 
    74 void __atomic_store_8(volatile void *mem0, unsigned long long val, int model)
    75 {
    76         volatile unsigned long long *mem = mem0;
    77 
    78         (void) model;
    79 
    80         /* scratch register */
    81         unsigned tmp;
    82 
    83         /*
    84          * The following instructions between labels 1 and 2 constitute a
    85          * Restartable Atomic Seqeunce. Should the sequence be non-atomic,
    86          * the kernel will restart it.
    87          */
    88         asm volatile (
    89             "1:\n"
    90             "   adr %[tmp], 1b\n"
    91             "   str %[tmp], %[rp0]\n"
    92             "   adr %[tmp], 2f\n"
    93             "   str %[tmp], %[rp1]\n"
    94 
    95             "   strd %[imm], %[addr]\n"
    96             "2:\n"
    97             : [tmp] "=&r" (tmp),
    98               [rp0] "=m" (ras_page[0]),
    99               [rp1] "=m" (ras_page[1]),
    100               [addr] "=m" (*mem)
    101             : [imm] "r" (val)
    102         );
    103 
    104         ras_page[0] = 0;
    105         ras_page[1] = 0xffffffff;
    106 }
    107 
    10840bool __atomic_compare_exchange_4(volatile void *mem0, void *expected0,
    10941    unsigned desired, bool weak, int success, int failure)
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