1 /* 2 * Copyright (C) 2004-2006 Atmel Corporation 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 */ 8 #ifndef __ASM_AVR32_SWITCH_TO_H 9 #define __ASM_AVR32_SWITCH_TO_H 10 11 /* 12 * Help PathFinder and other Nexus-compliant debuggers keep track of 13 * the current PID by emitting an Ownership Trace Message each time we 14 * switch task. 15 */ 16 #ifdef CONFIG_OWNERSHIP_TRACE 17 #include <asm/ocd.h> 18 #define ocd_switch(prev, next) \ 19 do { \ 20 ocd_write(PID, prev->pid); \ 21 ocd_write(PID, next->pid); \ 22 } while(0) 23 #else 24 #define ocd_switch(prev, next) 25 #endif 26 27 /* 28 * switch_to(prev, next, last) should switch from task `prev' to task 29 * `next'. `prev' will never be the same as `next'. 30 * 31 * We just delegate everything to the __switch_to assembly function, 32 * which is implemented in arch/avr32/kernel/switch_to.S 33 * 34 * mb() tells GCC not to cache `current' across this call. 35 */ 36 struct cpu_context; 37 struct task_struct; 38 extern struct task_struct *__switch_to(struct task_struct *, 39 struct cpu_context *, 40 struct cpu_context *); 41 #define switch_to(prev, next, last) \ 42 do { \ 43 ocd_switch(prev, next); \ 44 last = __switch_to(prev, &prev->thread.cpu_context + 1, \ 45 &next->thread.cpu_context); \ 46 } while (0) 47 48 49 #endif /* __ASM_AVR32_SWITCH_TO_H */ 50