tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
21asmlinkage struct task_struct *resume(struct task_struct *prev, struct task_struct *next);
22
23#ifndef CONFIG_SMP
24#define switch_to(prev,next,last) \
25do { \
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) \
34do { \
35 (last) = resume(prev, next); \
36} while (0)
37#endif
38
39#endif /* _BLACKFIN_SWITCH_TO_H */