1 /* 2 * Copyright IBM Corp. 1999, 2009 3 * 4 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> 5 */ 6 7 #ifndef __ASM_SWITCH_TO_H 8 #define __ASM_SWITCH_TO_H 9 10 #include <linux/thread_info.h> 11 #include <asm/fpu/api.h> 12 #include <asm/ptrace.h> 13 14 extern struct task_struct *__switch_to(void *, void *); 15 extern void update_cr_regs(struct task_struct *task); 16 17 static inline void save_access_regs(unsigned int *acrs) 18 { 19 typedef struct { int _[NUM_ACRS]; } acrstype; 20 21 asm volatile("stam 0,15,%0" : "=Q" (*(acrstype *)acrs)); 22 } 23 24 static inline void restore_access_regs(unsigned int *acrs) 25 { 26 typedef struct { int _[NUM_ACRS]; } acrstype; 27 28 asm volatile("lam 0,15,%0" : : "Q" (*(acrstype *)acrs)); 29 } 30 31 #define switch_to(prev,next,last) do { \ 32 if (prev->mm) { \ 33 save_fpu_regs(); \ 34 save_access_regs(&prev->thread.acrs[0]); \ 35 save_ri_cb(prev->thread.ri_cb); \ 36 } \ 37 if (next->mm) { \ 38 update_cr_regs(next); \ 39 set_cpu_flag(CIF_FPU); \ 40 restore_access_regs(&next->thread.acrs[0]); \ 41 restore_ri_cb(next->thread.ri_cb, prev->thread.ri_cb); \ 42 } \ 43 prev = __switch_to(prev,next); \ 44 } while (0) 45 46 #endif /* __ASM_SWITCH_TO_H */ 47