Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/include/asm-mips64/system.h
Version:
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1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999 by Ralf Baechle 7 * Modified further for R[236]000 by Paul M. Antoine, 1996 8 * Copyright (C) 1999 Silicon Graphics 9 */ 10 #ifndef _ASM_SYSTEM_H 11 #define _ASM_SYSTEM_H 12 13 #include <linux/config.h> 14 #include <asm/sgidefs.h> 15 16 #include <linux/kernel.h> 17 18 #include <asm/addrspace.h> 19 #include <asm/ptrace.h> 20 21 __asm__ ( 22 ".macro\t__sti\n\t" 23 ".set\tpush\n\t" 24 ".set\treorder\n\t" 25 ".set\tnoat\n\t" 26 "mfc0\t$1,$12\n\t" 27 "ori\t$1,0x1f\n\t" 28 "xori\t$1,0x1e\n\t" 29 "mtc0\t$1,$12\n\t" 30 ".set\tpop\n\t" 31 ".endm"); 32 33 extern __inline__ void 34 __sti(void) 35 { 36 __asm__ __volatile__( 37 "__sti" 38 : /* no outputs */ 39 : /* no inputs */ 40 : "memory"); 41 } 42 43 /* 44 * For cli() we have to insert nops to make sure that the new value 45 * has actually arrived in the status register before the end of this 46 * macro. 47 * R4000/R4400 need three nops, the R4600 two nops and the R10000 needs 48 * no nops at all. 49 */ 50 __asm__ ( 51 ".macro\t__cli\n\t" 52 ".set\tpush\n\t" 53 ".set\treorder\n\t" 54 ".set\tnoat\n\t" 55 "mfc0\t$1,$12\n\t" 56 "ori\t$1,1\n\t" 57 "xori\t$1,1\n\t" 58 ".set\tnoreorder\n\t" 59 "mtc0\t$1,$12\n\t" 60 "sll\t$0, $0, 1\t\t\t# nop\n\t" 61 "sll\t$0, $0, 1\t\t\t# nop\n\t" 62 "sll\t$0, $0, 1\t\t\t# nop\n\t" 63 ".set\tpop\n\t" 64 ".endm"); 65 66 extern __inline__ void 67 __cli(void) 68 { 69 __asm__ __volatile__( 70 "__cli" 71 : /* no outputs */ 72 : /* no inputs */ 73 : "memory"); 74 } 75 76 __asm__ ( 77 ".macro\t__save_flags flags\n\t" 78 ".set\tpush\n\t" 79 ".set\treorder\n\t" 80 "mfc0\t\\flags, $12\n\t" 81 ".set\tpop\n\t" 82 ".endm"); 83 84 #define __save_flags(x) \ 85 __asm__ __volatile__( \ 86 "__save_flags %0" \ 87 : "=r" (x)) 88 89 __asm__ ( 90 ".macro\t__save_and_cli result\n\t" 91 ".set\tpush\n\t" 92 ".set\treorder\n\t" 93 ".set\tnoat\n\t" 94 "mfc0\t\\result, $12\n\t" 95 "ori\t$1, \\result, 1\n\t" 96 "xori\t$1, 1\n\t" 97 ".set\tnoreorder\n\t" 98 "mtc0\t$1, $12\n\t" 99 "sll\t$0, $0, 1\t\t\t# nop\n\t" 100 "sll\t$0, $0, 1\t\t\t# nop\n\t" 101 "sll\t$0, $0, 1\t\t\t# nop\n\t" 102 ".set\tpop\n\t" 103 ".endm"); 104 105 #define __save_and_cli(x) \ 106 __asm__ __volatile__( \ 107 "__save_and_cli\t%0" \ 108 : "=r" (x) \ 109 : /* no inputs */ \ 110 : "memory") 111 112 __asm__ ( 113 ".macro\t__save_and_sti result\n\t" 114 ".set\tpush\n\t" 115 ".set\treorder\n\t" 116 ".set\tnoat\n\t" 117 "mfc0\t\\result, $12\n\t" 118 "ori\t$1, \\result, 1\n\t" 119 ".set\tnoreorder\n\t" 120 "mtc0\t$1, $12\n\t" 121 ".set\tpop\n\t" 122 ".endm"); 123 124 #define __save_and_sti(x) \ 125 __asm__ __volatile__( \ 126 "__save_and_sti\t%0" \ 127 : "=r" (x) \ 128 : /* no inputs */ \ 129 : "memory") 130 131 __asm__(".macro\t__restore_flags flags\n\t" 132 ".set\tnoreorder\n\t" 133 ".set\tnoat\n\t" 134 "mfc0\t$1, $12\n\t" 135 "andi\t\\flags, 1\n\t" 136 "ori\t$1, 1\n\t" 137 "xori\t$1, 1\n\t" 138 "or\t\\flags, $1\n\t" 139 "mtc0\t\\flags, $12\n\t" 140 "sll\t$0, $0, 1\t\t\t# nop\n\t" 141 "sll\t$0, $0, 1\t\t\t# nop\n\t" 142 "sll\t$0, $0, 1\t\t\t# nop\n\t" 143 ".set\tat\n\t" 144 ".set\treorder\n\t" 145 ".endm"); 146 147 #define __restore_flags(flags) \ 148 do { \ 149 unsigned long __tmp1; \ 150 \ 151 __asm__ __volatile__( \ 152 "__restore_flags\t%0" \ 153 : "=r" (__tmp1) \ 154 : "" (flags) \ 155 : "memory"); \ 156 } while(0) 157 158 #ifdef CONFIG_SMP 159 160 extern void __global_cli(void); 161 extern void __global_sti(void); 162 extern unsigned long __global_save_flags(void); 163 extern void __global_restore_flags(unsigned long); 164 #define cli() __global_cli() 165 #define sti() __global_sti() 166 #define save_flags(x) ((x)=__global_save_flags()) 167 #define restore_flags(x) __global_restore_flags(x) 168 #define save_and_cli(x) do { save_flags(x); cli(); } while(0) 169 #define save_and_sti(x) do { save_flags(x); sti(); } while(0) 170 171 #else 172 173 #define cli() __cli() 174 #define sti() __sti() 175 #define save_flags(x) __save_flags(x) 176 #define restore_flags(x) __restore_flags(x) 177 #define save_and_cli(x) __save_and_cli(x) 178 #define save_and_sti(x) __save_and_sti(x) 179 180 #endif /* CONFIG_SMP */ 181 182 /* For spinlocks etc */ 183 #define local_irq_save(x) __save_and_cli(x) 184 #define local_irq_set(x) __save_and_sti(x) 185 #define local_irq_restore(x) __restore_flags(x) 186 #define local_irq_disable() __cli() 187 #define local_irq_enable() __sti() 188 189 #define __sync() \ 190 __asm__ __volatile__( \ 191 ".set push\n\t" \ 192 ".set noreorder\n\t" \ 193 "sync\n\t" \ 194 ".set pop" \ 195 : /* no output */ \ 196 : /* no input */ \ 197 : "memory") 198 199 #define fast_wmb() __sync() 200 #define fast_rmb() __sync() 201 #define fast_mb() __sync() 202 #define fast_iob() \ 203 do { \ 204 __sync(); \ 205 __asm__ __volatile__( \ 206 ".set push\n\t" \ 207 ".set noreorder\n\t" \ 208 "lw $0,%0\n\t" \ 209 "nop\n\t" \ 210 ".set pop" \ 211 : /* no output */ \ 212 : "m" (*(int *)KSEG1) \ 213 : "memory"); \ 214 } while (0) 215 216 #define wmb() fast_wmb() 217 #define rmb() fast_rmb() 218 #define mb() fast_mb() 219 #define iob() fast_iob() 220 221 #ifdef CONFIG_SMP 222 #define smp_mb() mb() 223 #define smp_rmb() rmb() 224 #define smp_wmb() wmb() 225 #else 226 #define smp_mb() barrier() 227 #define smp_rmb() barrier() 228 #define smp_wmb() barrier() 229 #endif 230 231 #define set_mb(var, value) \ 232 do { var = value; mb(); } while (0) 233 234 #define set_wmb(var, value) \ 235 do { var = value; wmb(); } while (0) 236 237 /* 238 * switch_to(n) should switch tasks to task nr n, first 239 * checking that n isn't the current task, in which case it does nothing. 240 */ 241 extern asmlinkage void *resume(void *last, void *next); 242 243 #define prepare_to_switch() do { } while(0) 244 245 struct task_struct; 246 247 #define switch_to(prev,next,last) \ 248 do { \ 249 (last) = resume(prev, next); \ 250 } while(0) 251 252 extern __inline__ unsigned long xchg_u32(volatile int * m, unsigned long val) 253 { 254 unsigned long dummy; 255 256 __asm__ __volatile__( 257 ".set\tpush\t\t\t\t# xchg_u32\n\t" 258 ".set\tnoreorder\n\t" 259 ".set\tnomacro\n\t" 260 "ll\t%0, %3\n" 261 "1:\tmove\t%2, %z4\n\t" 262 "sc\t%2, %1\n\t" 263 "beqzl\t%2, 1b\n\t" 264 " ll\t%0, %3\n\t" 265 "sync\n\t" 266 ".set\tpop" 267 : "=&r" (val), "=m" (*m), "=&r" (dummy) 268 : "R" (*m), "Jr" (val) 269 : "memory"); 270 271 return val; 272 } 273 274 extern __inline__ unsigned long xchg_u64(volatile int * m, unsigned long val) 275 { 276 unsigned long dummy; 277 278 __asm__ __volatile__( 279 ".set\tpush\t\t\t\t# xchg_u64\n\t" 280 ".set\tnoreorder\n\t" 281 ".set\tnomacro\n\t" 282 "lld\t%0, %3\n" 283 "1:\tmove\t%2, %z4\n\t" 284 "scd\t%2, %1\n\t" 285 "beqzl\t%2, 1b\n\t" 286 " lld\t%0, %3\n\t" 287 "sync\n\t" 288 ".set\tpop" 289 : "=&r" (val), "=m" (*m), "=&r" (dummy) 290 : "R" (*m), "Jr" (val) 291 : "memory"); 292 293 return val; 294 } 295 296 #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr)))) 297 #define tas(ptr) (xchg((ptr),1)) 298 299 300 static inline unsigned long __xchg(unsigned long x, volatile void * ptr, 301 int size) 302 { 303 switch (size) { 304 case 4: 305 return xchg_u32(ptr, x); 306 case 8: 307 return xchg_u64(ptr, x); 308 } 309 return x; 310 } 311 312 extern void *set_except_vector(int n, void *addr); 313 extern void per_cpu_trap_init(void); 314 315 extern void __die(const char *, struct pt_regs *, const char *file, 316 const char *func, unsigned long line) __attribute__((noreturn)); 317 extern void __die_if_kernel(const char *, struct pt_regs *, const char *file, 318 const char *func, unsigned long line); 319 320 #define die(msg, regs) \ 321 __die(msg, regs, __FILE__ ":", __FUNCTION__, __LINE__) 322 #define die_if_kernel(msg, regs) \ 323 __die_if_kernel(msg, regs, __FILE__ ":", __FUNCTION__, __LINE__) 324 325 #endif /* _ASM_SYSTEM_H */
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