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12 #ifndef _ASM_SWITCH_TO_H
13 #define _ASM_SWITCH_TO_H
14
15 #include <asm/cpu-features.h>
16 #include <asm/watch.h>
17 #include <asm/dsp.h>
18 #include <asm/cop2.h>
19 #include <asm/fpu.h>
20
21 struct task_struct;
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31
32 extern asmlinkage struct task_struct *resume(struct task_struct *prev,
33 struct task_struct *next, struct thread_info *next_ti);
34
35 extern unsigned int ll_bit;
36 extern struct task_struct *ll_task;
37
38 #ifdef CONFIG_MIPS_MT_FPAFF
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52 #define __mips_mt_fpaff_switch_to(prev) \
53 do { \
54 struct thread_info *__prev_ti = task_thread_info(prev); \
55 \
56 if (cpu_has_fpu && \
57 test_ti_thread_flag(__prev_ti, TIF_FPUBOUND) && \
58 (!(KSTK_STATUS(prev) & ST0_CU1))) { \
59 clear_ti_thread_flag(__prev_ti, TIF_FPUBOUND); \
60 prev->cpus_mask = prev->thread.user_cpus_allowed; \
61 } \
62 next->thread.emulated_fp = 0; \
63 } while(0)
64
65 #else
66 #define __mips_mt_fpaff_switch_to(prev) do { (void) (prev); } while (0)
67 #endif
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72
73 #define __clear_r6_hw_ll_bit() do { \
74 if (cpu_has_mips_r6) \
75 write_c0_lladdr(0); \
76 } while (0)
77
78 #define __clear_software_ll_bit() do { \
79 if (!__builtin_constant_p(cpu_has_llsc) || !cpu_has_llsc) \
80 ll_bit = 0; \
81 } while (0)
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86
87 #ifdef CONFIG_MIPS_FP_SUPPORT
88 # define __sanitize_fcr31(next) \
89 do { \
90 unsigned long fcr31 = mask_fcr31_x(next->thread.fpu.fcr31); \
91 void __user *pc; \
92 \
93 if (unlikely(fcr31)) { \
94 pc = (void __user *)task_pt_regs(next)->cp0_epc; \
95 next->thread.fpu.fcr31 &= ~fcr31; \
96 force_fcr31_sig(fcr31, pc, next); \
97 } \
98 } while (0)
99 #else
100 # define __sanitize_fcr31(next)
101 #endif
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108
109 #define switch_to(prev, next, last) \
110 do { \
111 __mips_mt_fpaff_switch_to(prev); \
112 lose_fpu_inatomic(1, prev); \
113 if (tsk_used_math(next)) \
114 __sanitize_fcr31(next); \
115 if (cpu_has_dsp) { \
116 __save_dsp(prev); \
117 __restore_dsp(next); \
118 } \
119 if (cop2_present) { \
120 set_c0_status(ST0_CU2); \
121 if ((KSTK_STATUS(prev) & ST0_CU2)) { \
122 if (cop2_lazy_restore) \
123 KSTK_STATUS(prev) &= ~ST0_CU2; \
124 cop2_save(prev); \
125 } \
126 if (KSTK_STATUS(next) & ST0_CU2 && \
127 !cop2_lazy_restore) { \
128 cop2_restore(next); \
129 } \
130 clear_c0_status(ST0_CU2); \
131 } \
132 __clear_r6_hw_ll_bit(); \
133 __clear_software_ll_bit(); \
134 if (cpu_has_userlocal) \
135 write_c0_userlocal(task_thread_info(next)->tp_value); \
136 __restore_watch(next); \
137 (last) = resume(prev, next, task_thread_info(next)); \
138 } while (0)
139
140 #endif