1 /*
2 * Copyright 2004-2009 Analog Devices Inc.
3 * Tony Kou (tonyko@lineo.ca)
4 *
5 * Licensed under the GPL-2 or later
6 */
7
8 #ifndef _BLACKFIN_SWITCH_TO_H
9 #define _BLACKFIN_SWITCH_TO_H
10
11 #define prepare_to_switch() do { } while(0)
12
13 /*
14 * switch_to(n) should switch tasks to task ptr, first checking that
15 * ptr isn't the current task, in which case it does nothing.
16 */
17
18 #include <asm/l1layout.h>
19 #include <asm/mem_map.h>
20
21 asmlinkage struct task_struct *resume(struct task_struct *prev, struct task_struct *next);
22
23 #ifndef CONFIG_SMP
24 #define switch_to(prev,next,last) \
25 do { \
26 memcpy (&task_thread_info(prev)->l1_task_info, L1_SCRATCH_TASK_INFO, \
27 sizeof *L1_SCRATCH_TASK_INFO); \
28 memcpy (L1_SCRATCH_TASK_INFO, &task_thread_info(next)->l1_task_info, \
29 sizeof *L1_SCRATCH_TASK_INFO); \
30 (last) = resume (prev, next); \
31 } while (0)
32 #else
33 #define switch_to(prev, next, last) \
34 do { \
35 (last) = resume(prev, next); \
36 } while (0)
37 #endif
38
39 #endif /* _BLACKFIN_SWITCH_TO_H */
40
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