David Howells | a0616cd | 2012-03-28 18:30:02 +0100 | [diff] [blame] | 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 | |
| 12 | extern struct task_struct *__switch_to(void *, void *); |
| 13 | extern void update_per_regs(struct task_struct *task); |
| 14 | |
| 15 | static inline void save_fp_regs(s390_fp_regs *fpregs) |
| 16 | { |
| 17 | asm volatile( |
| 18 | " std 0,%O0+8(%R0)\n" |
| 19 | " std 2,%O0+24(%R0)\n" |
| 20 | " std 4,%O0+40(%R0)\n" |
| 21 | " std 6,%O0+56(%R0)" |
| 22 | : "=Q" (*fpregs) : "Q" (*fpregs)); |
| 23 | if (!MACHINE_HAS_IEEE) |
| 24 | return; |
| 25 | asm volatile( |
| 26 | " stfpc %0\n" |
| 27 | " std 1,%O0+16(%R0)\n" |
| 28 | " std 3,%O0+32(%R0)\n" |
| 29 | " std 5,%O0+48(%R0)\n" |
| 30 | " std 7,%O0+64(%R0)\n" |
| 31 | " std 8,%O0+72(%R0)\n" |
| 32 | " std 9,%O0+80(%R0)\n" |
| 33 | " std 10,%O0+88(%R0)\n" |
| 34 | " std 11,%O0+96(%R0)\n" |
| 35 | " std 12,%O0+104(%R0)\n" |
| 36 | " std 13,%O0+112(%R0)\n" |
| 37 | " std 14,%O0+120(%R0)\n" |
| 38 | " std 15,%O0+128(%R0)\n" |
| 39 | : "=Q" (*fpregs) : "Q" (*fpregs)); |
| 40 | } |
| 41 | |
| 42 | static inline void restore_fp_regs(s390_fp_regs *fpregs) |
| 43 | { |
| 44 | asm volatile( |
| 45 | " ld 0,%O0+8(%R0)\n" |
| 46 | " ld 2,%O0+24(%R0)\n" |
| 47 | " ld 4,%O0+40(%R0)\n" |
| 48 | " ld 6,%O0+56(%R0)" |
| 49 | : : "Q" (*fpregs)); |
| 50 | if (!MACHINE_HAS_IEEE) |
| 51 | return; |
| 52 | asm volatile( |
| 53 | " lfpc %0\n" |
| 54 | " ld 1,%O0+16(%R0)\n" |
| 55 | " ld 3,%O0+32(%R0)\n" |
| 56 | " ld 5,%O0+48(%R0)\n" |
| 57 | " ld 7,%O0+64(%R0)\n" |
| 58 | " ld 8,%O0+72(%R0)\n" |
| 59 | " ld 9,%O0+80(%R0)\n" |
| 60 | " ld 10,%O0+88(%R0)\n" |
| 61 | " ld 11,%O0+96(%R0)\n" |
| 62 | " ld 12,%O0+104(%R0)\n" |
| 63 | " ld 13,%O0+112(%R0)\n" |
| 64 | " ld 14,%O0+120(%R0)\n" |
| 65 | " ld 15,%O0+128(%R0)\n" |
| 66 | : : "Q" (*fpregs)); |
| 67 | } |
| 68 | |
| 69 | static inline void save_access_regs(unsigned int *acrs) |
| 70 | { |
| 71 | asm volatile("stam 0,15,%0" : "=Q" (*acrs)); |
| 72 | } |
| 73 | |
| 74 | static inline void restore_access_regs(unsigned int *acrs) |
| 75 | { |
| 76 | asm volatile("lam 0,15,%0" : : "Q" (*acrs)); |
| 77 | } |
| 78 | |
| 79 | #define switch_to(prev,next,last) do { \ |
| 80 | if (prev->mm) { \ |
| 81 | save_fp_regs(&prev->thread.fp_regs); \ |
| 82 | save_access_regs(&prev->thread.acrs[0]); \ |
| 83 | } \ |
| 84 | if (next->mm) { \ |
| 85 | restore_fp_regs(&next->thread.fp_regs); \ |
| 86 | restore_access_regs(&next->thread.acrs[0]); \ |
| 87 | update_per_regs(next); \ |
| 88 | } \ |
| 89 | prev = __switch_to(prev,next); \ |
| 90 | } while (0) |
| 91 | |
| 92 | extern void account_vtime(struct task_struct *, struct task_struct *); |
| 93 | extern void account_tick_vtime(struct task_struct *); |
| 94 | |
| 95 | #define finish_arch_switch(prev) do { \ |
| 96 | set_fs(current->thread.mm_segment); \ |
| 97 | account_vtime(prev, current); \ |
| 98 | } while (0) |
| 99 | |
| 100 | #endif /* __ASM_SWITCH_TO_H */ |