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 #include <asm/guarded_storage.h> 14 15 extern struct task_struct *__switch_to(void *, void *); 16 extern void update_cr_regs(struct task_struct *task); 17 18 static inline void save_access_regs(unsigned int *acrs) 19 { 20 typedef struct { int _[NUM_ACRS]; } acrstype; 21 22 asm volatile("stam 0,15,%0" : "=Q" (*(acrstype *)acrs)); 23 } 24 25 static inline void restore_access_regs(unsigned int *acrs) 26 { 27 typedef struct { int _[NUM_ACRS]; } acrstype; 28 29 asm volatile("lam 0,15,%0" : : "Q" (*(acrstype *)acrs)); 30 } 31 32 #define switch_to(prev,next,last) do { \ 33 if (prev->mm) { \ 34 save_fpu_regs(); \ 35 save_access_regs(&prev->thread.acrs[0]); \ 36 save_ri_cb(prev->thread.ri_cb); \ 37 save_gs_cb(prev->thread.gs_cb); \ 38 } \ 39 if (next->mm) { \ 40 update_cr_regs(next); \ 41 set_cpu_flag(CIF_FPU); \ 42 restore_access_regs(&next->thread.acrs[0]); \ 43 restore_ri_cb(next->thread.ri_cb, prev->thread.ri_cb); \ 44 restore_gs_cb(next->thread.gs_cb); \ 45 } \ 46 prev = __switch_to(prev,next); \ 47 } while (0) 48 49 #endif /* __ASM_SWITCH_TO_H */ 50