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git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/blob - arch/s390/include/asm/switch_to.h
2 * Copyright IBM Corp. 1999, 2009
4 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
7 #ifndef __ASM_SWITCH_TO_H
8 #define __ASM_SWITCH_TO_H
10 #include <linux/thread_info.h>
11 #include <asm/fpu/api.h>
12 #include <asm/ptrace.h>
13 #include <asm/guarded_storage.h>
15 extern struct task_struct
*__switch_to(void *, void *);
16 extern void update_cr_regs(struct task_struct
*task
);
18 static inline void save_access_regs(unsigned int *acrs
)
20 typedef struct { int _
[NUM_ACRS
]; } acrstype
;
22 asm volatile("stam 0,15,%0" : "=Q" (*(acrstype
*)acrs
));
25 static inline void restore_access_regs(unsigned int *acrs
)
27 typedef struct { int _
[NUM_ACRS
]; } acrstype
;
29 asm volatile("lam 0,15,%0" : : "Q" (*(acrstype
*)acrs
));
32 #define switch_to(prev,next,last) do { \
35 save_access_regs(&prev->thread.acrs[0]); \
36 save_ri_cb(prev->thread.ri_cb); \
37 save_gs_cb(prev->thread.gs_cb); \
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); \
46 prev = __switch_to(prev,next); \
49 #endif /* __ASM_SWITCH_TO_H */