atomic.c
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1 #include "config.h"
2 #include <atomic.h>
3 
4 #ifdef CONF_ATOMIC
5 
12 void atomic_inc(atomic_t* counter);
13 __asm__("\n\
14 .text\n\
15 .globl _atomic_inc\n\
16  _atomic_inc:\n\
17  stc ccr, r1h ; save flags\n\
18  orc #0x80, ccr ; disable all but NMI\n\
19  mov.b @r0, r1l\n\
20  inc r1l\n\
21  mov.b r1l, @r0\n\
22  ldc r1h, ccr ; restore flags\n\
23  rts\n\
24 ");
25 
33 void atomic_dec(atomic_t* counter);
34 __asm__("\n\
35 .text\n\
36 .globl _atomic_dec\n\
37  _atomic_dec:\n\
38  stc ccr, r1h\n\
39  orc #0x80, ccr\n\
40  mov.b @r0, r1l\n\
41  dec r1l\n\
42  mov.b r1l, @r0\n\
43  ldc r1h, ccr\n\
44  rts\n\
45 ");
46 #endif
kernel configuration file
volatile unsigned char atomic_t
The data type that allows for atomic count operations.
Definition: atomic.h:43
Interface: critical section management.
void atomic_inc(atomic_t *counter)
increment atomic counter without interruption.
__asm__("\n\ .text\n\ .globl _atomic_inc\n\ _atomic_inc:\n\ stc ccr, r1h ; save flags\n\ orc #0x80, ccr ; disable all but NMI\n\ mov.b @r0, r1l\n\ inc r1l\n\ mov.b r1l, @r0\n\ ldc r1h, ccr ; restore flags\n\ rts\n\ ")
void atomic_dec(atomic_t *counter)
decrement atomic counter without interruption.

brickOS is released under the Mozilla Public License.
Original code copyright 1998-2005 by the authors.

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