diff options
Diffstat (limited to 'kernel/arch/blackfin/include/asm/switch_to.h')
| -rw-r--r-- | kernel/arch/blackfin/include/asm/switch_to.h | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/kernel/arch/blackfin/include/asm/switch_to.h b/kernel/arch/blackfin/include/asm/switch_to.h new file mode 100644 index 000000000..aaf671be9 --- /dev/null +++ b/kernel/arch/blackfin/include/asm/switch_to.h @@ -0,0 +1,39 @@ +/* + * Copyright 2004-2009 Analog Devices Inc. + * Tony Kou (tonyko@lineo.ca) + * + * Licensed under the GPL-2 or later + */ + +#ifndef _BLACKFIN_SWITCH_TO_H +#define _BLACKFIN_SWITCH_TO_H + +#define prepare_to_switch() do { } while(0) + +/* + * switch_to(n) should switch tasks to task ptr, first checking that + * ptr isn't the current task, in which case it does nothing. + */ + +#include <asm/l1layout.h> +#include <asm/mem_map.h> + +asmlinkage struct task_struct *resume(struct task_struct *prev, struct task_struct *next); + +#ifndef CONFIG_SMP +#define switch_to(prev,next,last) \ +do { \ + memcpy (&task_thread_info(prev)->l1_task_info, L1_SCRATCH_TASK_INFO, \ + sizeof *L1_SCRATCH_TASK_INFO); \ + memcpy (L1_SCRATCH_TASK_INFO, &task_thread_info(next)->l1_task_info, \ + sizeof *L1_SCRATCH_TASK_INFO); \ + (last) = resume (prev, next); \ +} while (0) +#else +#define switch_to(prev, next, last) \ +do { \ + (last) = resume(prev, next); \ +} while (0) +#endif + +#endif /* _BLACKFIN_SWITCH_TO_H */ |