1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright IBM Corp. 1999, 2009 4 * 5 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> 6 */ 7 8 #ifndef __ASM_SWITCH_TO_H 9 #define __ASM_SWITCH_TO_H 10 11 #include <linux/thread_info.h> 12 #include <asm/fpu/api.h> 13 #include <asm/ptrace.h> 14 #include <asm/guarded_storage.h> 15 16 extern struct task_struct *__switch_to(void *, void *); 17 extern void update_cr_regs(struct task_struct *task); 18 19 static inline void save_access_regs(unsigned int *acrs) 20 { 21 typedef struct { int _[NUM_ACRS]; } acrstype; 22 23 asm volatile("stam 0,15,%0" : "=Q" (*(acrstype *)acrs)); 24 } 25 26 static inline void restore_access_regs(unsigned int *acrs) 27 { 28 typedef struct { int _[NUM_ACRS]; } acrstype; 29 30 asm volatile("lam 0,15,%0" : : "Q" (*(acrstype *)acrs)); 31 } 32 33 #define switch_to(prev,next,last) do { \ 34 if (prev->mm) { \ 35 save_fpu_regs(); \ 36 save_access_regs(&prev->thread.acrs[0]); \ 37 save_ri_cb(prev->thread.ri_cb); \ 38 save_gs_cb(prev->thread.gs_cb); \ 39 } \ 40 update_cr_regs(next); \ 41 if (next->mm) { \ 42 set_cpu_flag(CIF_FPU); \ 43 restore_access_regs(&next->thread.acrs[0]); \ 44 restore_ri_cb(next->thread.ri_cb, prev->thread.ri_cb); \ 45 restore_gs_cb(next->thread.gs_cb); \ 46 } \ 47 prev = __switch_to(prev,next); \ 48 } while (0) 49 50 #endif /* __ASM_SWITCH_TO_H */ 51