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 #include <asm/ptrace.h> 12 13 extern struct task_struct *__switch_to(void *, void *); 14 extern void update_cr_regs(struct task_struct *task); 15 16 static inline int test_fp_ctl(u32 fpc) 17 { 18 u32 orig_fpc; 19 int rc; 20 21 if (!MACHINE_HAS_IEEE) 22 return 0; 23 24 asm volatile( 25 " efpc %1\n" 26 " sfpc %2\n" 27 "0: sfpc %1\n" 28 " la %0,0\n" 29 "1:\n" 30 EX_TABLE(0b,1b) 31 : "=d" (rc), "=d" (orig_fpc) 32 : "d" (fpc), "0" (-EINVAL)); 33 return rc; 34 } 35 36 static inline void save_fp_ctl(u32 *fpc) 37 { 38 if (!MACHINE_HAS_IEEE) 39 return; 40 41 asm volatile( 42 " stfpc %0\n" 43 : "+Q" (*fpc)); 44 } 45 46 static inline int restore_fp_ctl(u32 *fpc) 47 { 48 int rc; 49 50 if (!MACHINE_HAS_IEEE) 51 return 0; 52 53 asm volatile( 54 " lfpc %1\n" 55 "0: la %0,0\n" 56 "1:\n" 57 EX_TABLE(0b,1b) 58 : "=d" (rc) : "Q" (*fpc), "0" (-EINVAL)); 59 return rc; 60 } 61 62 static inline void save_fp_regs(freg_t *fprs) 63 { 64 asm volatile("std 0,%0" : "=Q" (fprs[0])); 65 asm volatile("std 2,%0" : "=Q" (fprs[2])); 66 asm volatile("std 4,%0" : "=Q" (fprs[4])); 67 asm volatile("std 6,%0" : "=Q" (fprs[6])); 68 if (!MACHINE_HAS_IEEE) 69 return; 70 asm volatile("std 1,%0" : "=Q" (fprs[1])); 71 asm volatile("std 3,%0" : "=Q" (fprs[3])); 72 asm volatile("std 5,%0" : "=Q" (fprs[5])); 73 asm volatile("std 7,%0" : "=Q" (fprs[7])); 74 asm volatile("std 8,%0" : "=Q" (fprs[8])); 75 asm volatile("std 9,%0" : "=Q" (fprs[9])); 76 asm volatile("std 10,%0" : "=Q" (fprs[10])); 77 asm volatile("std 11,%0" : "=Q" (fprs[11])); 78 asm volatile("std 12,%0" : "=Q" (fprs[12])); 79 asm volatile("std 13,%0" : "=Q" (fprs[13])); 80 asm volatile("std 14,%0" : "=Q" (fprs[14])); 81 asm volatile("std 15,%0" : "=Q" (fprs[15])); 82 } 83 84 static inline void restore_fp_regs(freg_t *fprs) 85 { 86 asm volatile("ld 0,%0" : : "Q" (fprs[0])); 87 asm volatile("ld 2,%0" : : "Q" (fprs[2])); 88 asm volatile("ld 4,%0" : : "Q" (fprs[4])); 89 asm volatile("ld 6,%0" : : "Q" (fprs[6])); 90 if (!MACHINE_HAS_IEEE) 91 return; 92 asm volatile("ld 1,%0" : : "Q" (fprs[1])); 93 asm volatile("ld 3,%0" : : "Q" (fprs[3])); 94 asm volatile("ld 5,%0" : : "Q" (fprs[5])); 95 asm volatile("ld 7,%0" : : "Q" (fprs[7])); 96 asm volatile("ld 8,%0" : : "Q" (fprs[8])); 97 asm volatile("ld 9,%0" : : "Q" (fprs[9])); 98 asm volatile("ld 10,%0" : : "Q" (fprs[10])); 99 asm volatile("ld 11,%0" : : "Q" (fprs[11])); 100 asm volatile("ld 12,%0" : : "Q" (fprs[12])); 101 asm volatile("ld 13,%0" : : "Q" (fprs[13])); 102 asm volatile("ld 14,%0" : : "Q" (fprs[14])); 103 asm volatile("ld 15,%0" : : "Q" (fprs[15])); 104 } 105 106 static inline void save_vx_regs(__vector128 *vxrs) 107 { 108 typedef struct { __vector128 _[__NUM_VXRS]; } addrtype; 109 110 asm volatile( 111 " la 1,%0\n" 112 " .word 0xe70f,0x1000,0x003e\n" /* vstm 0,15,0(1) */ 113 " .word 0xe70f,0x1100,0x0c3e\n" /* vstm 16,31,256(1) */ 114 : "=Q" (*(addrtype *) vxrs) : : "1"); 115 } 116 117 static inline void save_vx_regs_safe(__vector128 *vxrs) 118 { 119 unsigned long cr0, flags; 120 121 flags = arch_local_irq_save(); 122 __ctl_store(cr0, 0, 0); 123 __ctl_set_bit(0, 17); 124 __ctl_set_bit(0, 18); 125 save_vx_regs(vxrs); 126 __ctl_load(cr0, 0, 0); 127 arch_local_irq_restore(flags); 128 } 129 130 static inline void restore_vx_regs(__vector128 *vxrs) 131 { 132 typedef struct { __vector128 _[__NUM_VXRS]; } addrtype; 133 134 asm volatile( 135 " la 1,%0\n" 136 " .word 0xe70f,0x1000,0x0036\n" /* vlm 0,15,0(1) */ 137 " .word 0xe70f,0x1100,0x0c36\n" /* vlm 16,31,256(1) */ 138 : : "Q" (*(addrtype *) vxrs) : "1"); 139 } 140 141 static inline void save_fp_vx_regs(struct task_struct *task) 142 { 143 #ifdef CONFIG_64BIT 144 if (task->thread.vxrs) 145 save_vx_regs(task->thread.vxrs); 146 else 147 #endif 148 save_fp_regs(task->thread.fp_regs.fprs); 149 } 150 151 static inline void restore_fp_vx_regs(struct task_struct *task) 152 { 153 #ifdef CONFIG_64BIT 154 if (task->thread.vxrs) 155 restore_vx_regs(task->thread.vxrs); 156 else 157 #endif 158 restore_fp_regs(task->thread.fp_regs.fprs); 159 } 160 161 static inline void save_access_regs(unsigned int *acrs) 162 { 163 typedef struct { int _[NUM_ACRS]; } acrstype; 164 165 asm volatile("stam 0,15,%0" : "=Q" (*(acrstype *)acrs)); 166 } 167 168 static inline void restore_access_regs(unsigned int *acrs) 169 { 170 typedef struct { int _[NUM_ACRS]; } acrstype; 171 172 asm volatile("lam 0,15,%0" : : "Q" (*(acrstype *)acrs)); 173 } 174 175 #define switch_to(prev,next,last) do { \ 176 if (prev->mm) { \ 177 save_fp_ctl(&prev->thread.fp_regs.fpc); \ 178 save_fp_vx_regs(prev); \ 179 save_access_regs(&prev->thread.acrs[0]); \ 180 save_ri_cb(prev->thread.ri_cb); \ 181 } \ 182 if (next->mm) { \ 183 update_cr_regs(next); \ 184 restore_fp_ctl(&next->thread.fp_regs.fpc); \ 185 restore_fp_vx_regs(next); \ 186 restore_access_regs(&next->thread.acrs[0]); \ 187 restore_ri_cb(next->thread.ri_cb, prev->thread.ri_cb); \ 188 } \ 189 prev = __switch_to(prev,next); \ 190 } while (0) 191 192 #endif /* __ASM_SWITCH_TO_H */ 193