diff options
Diffstat (limited to 'arch/avr32/include/asm/switch_to.h')
| -rw-r--r-- | arch/avr32/include/asm/switch_to.h | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/arch/avr32/include/asm/switch_to.h b/arch/avr32/include/asm/switch_to.h new file mode 100644 index 000000000000..9a8e9d5208d4 --- /dev/null +++ b/arch/avr32/include/asm/switch_to.h @@ -0,0 +1,46 @@ +/* + * Copyright (C) 2004-2006 Atmel Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#ifndef __ASM_AVR32_SWITCH_TO_H +#define __ASM_AVR32_SWITCH_TO_H + +/* + * Help PathFinder and other Nexus-compliant debuggers keep track of + * the current PID by emitting an Ownership Trace Message each time we + * switch task. + */ +#ifdef CONFIG_OWNERSHIP_TRACE +#include <asm/ocd.h> +#define finish_arch_switch(prev) \ + do { \ + ocd_write(PID, prev->pid); \ + ocd_write(PID, current->pid); \ + } while(0) +#endif + +/* + * switch_to(prev, next, last) should switch from task `prev' to task + * `next'. `prev' will never be the same as `next'. + * + * We just delegate everything to the __switch_to assembly function, + * which is implemented in arch/avr32/kernel/switch_to.S + * + * mb() tells GCC not to cache `current' across this call. + */ +struct cpu_context; +struct task_struct; +extern struct task_struct *__switch_to(struct task_struct *, + struct cpu_context *, + struct cpu_context *); +#define switch_to(prev, next, last) \ + do { \ + last = __switch_to(prev, &prev->thread.cpu_context + 1, \ + &next->thread.cpu_context); \ + } while (0) + + +#endif /* __ASM_AVR32_SWITCH_TO_H */ |