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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 | save_ri_cb(prev->thread.ri_cb); \ | |
84 | } \ | |
85 | if (next->mm) { \ | |
86 | restore_fp_regs(&next->thread.fp_regs); \ | |
87 | restore_access_regs(&next->thread.acrs[0]); \ | |
88 | restore_ri_cb(next->thread.ri_cb, prev->thread.ri_cb); \ | |
89 | update_per_regs(next); \ | |
90 | } \ | |
91 | prev = __switch_to(prev,next); \ | |
92 | } while (0) | |
93 | ||
94 | #define finish_arch_switch(prev) do { \ | |
95 | set_fs(current->thread.mm_segment); \ | |
96 | } while (0) | |
97 | ||
98 | #endif /* __ASM_SWITCH_TO_H */ |