| /* |
| * Copyright IBM Corp. 1999, 2009 |
| * |
| * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> |
| */ |
| |
| #ifndef __ASM_SWITCH_TO_H |
| #define __ASM_SWITCH_TO_H |
| |
| #include <linux/thread_info.h> |
| |
| extern struct task_struct *__switch_to(void *, void *); |
| extern void update_per_regs(struct task_struct *task); |
| |
| static inline void save_fp_regs(s390_fp_regs *fpregs) |
| { |
| asm volatile( |
| " std 0,%O0+8(%R0)\n" |
| " std 2,%O0+24(%R0)\n" |
| " std 4,%O0+40(%R0)\n" |
| " std 6,%O0+56(%R0)" |
| : "=Q" (*fpregs) : "Q" (*fpregs)); |
| if (!MACHINE_HAS_IEEE) |
| return; |
| asm volatile( |
| " stfpc %0\n" |
| " std 1,%O0+16(%R0)\n" |
| " std 3,%O0+32(%R0)\n" |
| " std 5,%O0+48(%R0)\n" |
| " std 7,%O0+64(%R0)\n" |
| " std 8,%O0+72(%R0)\n" |
| " std 9,%O0+80(%R0)\n" |
| " std 10,%O0+88(%R0)\n" |
| " std 11,%O0+96(%R0)\n" |
| " std 12,%O0+104(%R0)\n" |
| " std 13,%O0+112(%R0)\n" |
| " std 14,%O0+120(%R0)\n" |
| " std 15,%O0+128(%R0)\n" |
| : "=Q" (*fpregs) : "Q" (*fpregs)); |
| } |
| |
| static inline void restore_fp_regs(s390_fp_regs *fpregs) |
| { |
| asm volatile( |
| " ld 0,%O0+8(%R0)\n" |
| " ld 2,%O0+24(%R0)\n" |
| " ld 4,%O0+40(%R0)\n" |
| " ld 6,%O0+56(%R0)" |
| : : "Q" (*fpregs)); |
| if (!MACHINE_HAS_IEEE) |
| return; |
| asm volatile( |
| " lfpc %0\n" |
| " ld 1,%O0+16(%R0)\n" |
| " ld 3,%O0+32(%R0)\n" |
| " ld 5,%O0+48(%R0)\n" |
| " ld 7,%O0+64(%R0)\n" |
| " ld 8,%O0+72(%R0)\n" |
| " ld 9,%O0+80(%R0)\n" |
| " ld 10,%O0+88(%R0)\n" |
| " ld 11,%O0+96(%R0)\n" |
| " ld 12,%O0+104(%R0)\n" |
| " ld 13,%O0+112(%R0)\n" |
| " ld 14,%O0+120(%R0)\n" |
| " ld 15,%O0+128(%R0)\n" |
| : : "Q" (*fpregs)); |
| } |
| |
| static inline void save_access_regs(unsigned int *acrs) |
| { |
| asm volatile("stam 0,15,%0" : "=Q" (*acrs)); |
| } |
| |
| static inline void restore_access_regs(unsigned int *acrs) |
| { |
| asm volatile("lam 0,15,%0" : : "Q" (*acrs)); |
| } |
| |
| #define switch_to(prev,next,last) do { \ |
| if (prev->mm) { \ |
| save_fp_regs(&prev->thread.fp_regs); \ |
| save_access_regs(&prev->thread.acrs[0]); \ |
| } \ |
| if (next->mm) { \ |
| restore_fp_regs(&next->thread.fp_regs); \ |
| restore_access_regs(&next->thread.acrs[0]); \ |
| update_per_regs(next); \ |
| } \ |
| prev = __switch_to(prev,next); \ |
| } while (0) |
| |
| extern void account_vtime(struct task_struct *, struct task_struct *); |
| extern void account_tick_vtime(struct task_struct *); |
| |
| #define finish_arch_switch(prev) do { \ |
| set_fs(current->thread.mm_segment); \ |
| account_vtime(prev, current); \ |
| } while (0) |
| |
| #endif /* __ASM_SWITCH_TO_H */ |
