1 #ifndef _ASM_POWERPC_PROCESSOR_H 2 #define _ASM_POWERPC_PROCESSOR_H 3 4 /* 5 * Copyright (C) 2001 PPC 64 Team, IBM Corp 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 */ 12 13 #include <asm/reg.h> 14 15 #ifdef CONFIG_VSX 16 #define TS_FPRWIDTH 2 17 18 #ifdef __BIG_ENDIAN__ 19 #define TS_FPROFFSET 0 20 #define TS_VSRLOWOFFSET 1 21 #else 22 #define TS_FPROFFSET 1 23 #define TS_VSRLOWOFFSET 0 24 #endif 25 26 #else 27 #define TS_FPRWIDTH 1 28 #define TS_FPROFFSET 0 29 #endif 30 31 #ifdef CONFIG_PPC64 32 /* Default SMT priority is set to 3. Use 11- 13bits to save priority. */ 33 #define PPR_PRIORITY 3 34 #ifdef __ASSEMBLY__ 35 #define DEFAULT_PPR (PPR_PRIORITY << 50) 36 #else 37 #define DEFAULT_PPR ((u64)PPR_PRIORITY << 50) 38 #endif /* __ASSEMBLY__ */ 39 #endif /* CONFIG_PPC64 */ 40 41 #ifndef __ASSEMBLY__ 42 #include <linux/types.h> 43 #include <linux/thread_info.h> 44 #include <asm/ptrace.h> 45 #include <asm/hw_breakpoint.h> 46 47 /* We do _not_ want to define new machine types at all, those must die 48 * in favor of using the device-tree 49 * -- BenH. 50 */ 51 52 /* PREP sub-platform types. Unused */ 53 #define _PREP_Motorola 0x01 /* motorola prep */ 54 #define _PREP_Firm 0x02 /* firmworks prep */ 55 #define _PREP_IBM 0x00 /* ibm prep */ 56 #define _PREP_Bull 0x03 /* bull prep */ 57 58 /* CHRP sub-platform types. These are arbitrary */ 59 #define _CHRP_Motorola 0x04 /* motorola chrp, the cobra */ 60 #define _CHRP_IBM 0x05 /* IBM chrp, the longtrail and longtrail 2 */ 61 #define _CHRP_Pegasos 0x06 /* Genesi/bplan's Pegasos and Pegasos2 */ 62 #define _CHRP_briq 0x07 /* TotalImpact's briQ */ 63 64 #if defined(__KERNEL__) && defined(CONFIG_PPC32) 65 66 extern int _chrp_type; 67 68 #endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */ 69 70 /* Macros for adjusting thread priority (hardware multi-threading) */ 71 #define HMT_very_low() asm volatile("or 31,31,31 # very low priority") 72 #define HMT_low() asm volatile("or 1,1,1 # low priority") 73 #define HMT_medium_low() asm volatile("or 6,6,6 # medium low priority") 74 #define HMT_medium() asm volatile("or 2,2,2 # medium priority") 75 #define HMT_medium_high() asm volatile("or 5,5,5 # medium high priority") 76 #define HMT_high() asm volatile("or 3,3,3 # high priority") 77 78 #ifdef __KERNEL__ 79 80 #ifdef CONFIG_PPC64 81 #include <asm/task_size_64.h> 82 #else 83 #include <asm/task_size_32.h> 84 #endif 85 86 struct task_struct; 87 void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp); 88 void release_thread(struct task_struct *); 89 90 typedef struct { 91 unsigned long seg; 92 } mm_segment_t; 93 94 #define TS_FPR(i) fp_state.fpr[i][TS_FPROFFSET] 95 #define TS_CKFPR(i) ckfp_state.fpr[i][TS_FPROFFSET] 96 97 /* FP and VSX 0-31 register set */ 98 struct thread_fp_state { 99 u64 fpr[32][TS_FPRWIDTH] __attribute__((aligned(16))); 100 u64 fpscr; /* Floating point status */ 101 }; 102 103 /* Complete AltiVec register set including VSCR */ 104 struct thread_vr_state { 105 vector128 vr[32] __attribute__((aligned(16))); 106 vector128 vscr __attribute__((aligned(16))); 107 }; 108 109 struct debug_reg { 110 #ifdef CONFIG_PPC_ADV_DEBUG_REGS 111 /* 112 * The following help to manage the use of Debug Control Registers 113 * om the BookE platforms. 114 */ 115 uint32_t dbcr0; 116 uint32_t dbcr1; 117 #ifdef CONFIG_BOOKE 118 uint32_t dbcr2; 119 #endif 120 /* 121 * The stored value of the DBSR register will be the value at the 122 * last debug interrupt. This register can only be read from the 123 * user (will never be written to) and has value while helping to 124 * describe the reason for the last debug trap. Torez 125 */ 126 uint32_t dbsr; 127 /* 128 * The following will contain addresses used by debug applications 129 * to help trace and trap on particular address locations. 130 * The bits in the Debug Control Registers above help define which 131 * of the following registers will contain valid data and/or addresses. 132 */ 133 unsigned long iac1; 134 unsigned long iac2; 135 #if CONFIG_PPC_ADV_DEBUG_IACS > 2 136 unsigned long iac3; 137 unsigned long iac4; 138 #endif 139 unsigned long dac1; 140 unsigned long dac2; 141 #if CONFIG_PPC_ADV_DEBUG_DVCS > 0 142 unsigned long dvc1; 143 unsigned long dvc2; 144 #endif 145 #endif 146 }; 147 148 struct thread_struct { 149 unsigned long ksp; /* Kernel stack pointer */ 150 151 #ifdef CONFIG_PPC64 152 unsigned long ksp_vsid; 153 #endif 154 struct pt_regs *regs; /* Pointer to saved register state */ 155 mm_segment_t addr_limit; /* for get_fs() validation */ 156 #ifdef CONFIG_BOOKE 157 /* BookE base exception scratch space; align on cacheline */ 158 unsigned long normsave[8] ____cacheline_aligned; 159 #endif 160 #ifdef CONFIG_PPC32 161 void *pgdir; /* root of page-table tree */ 162 unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */ 163 #ifdef CONFIG_PPC_RTAS 164 unsigned long rtas_sp; /* stack pointer for when in RTAS */ 165 #endif 166 #endif 167 #if defined(CONFIG_PPC_BOOK3S_32) && defined(CONFIG_PPC_KUAP) 168 unsigned long kuap; /* opened segments for user access */ 169 #endif 170 /* Debug Registers */ 171 struct debug_reg debug; 172 struct thread_fp_state fp_state; 173 struct thread_fp_state *fp_save_area; 174 int fpexc_mode; /* floating-point exception mode */ 175 unsigned int align_ctl; /* alignment handling control */ 176 #ifdef CONFIG_HAVE_HW_BREAKPOINT 177 struct perf_event *ptrace_bps[HBP_NUM]; 178 /* 179 * Helps identify source of single-step exception and subsequent 180 * hw-breakpoint enablement 181 */ 182 struct perf_event *last_hit_ubp; 183 #endif /* CONFIG_HAVE_HW_BREAKPOINT */ 184 struct arch_hw_breakpoint hw_brk; /* info on the hardware breakpoint */ 185 unsigned long trap_nr; /* last trap # on this thread */ 186 u8 load_slb; /* Ages out SLB preload cache entries */ 187 u8 load_fp; 188 #ifdef CONFIG_ALTIVEC 189 u8 load_vec; 190 struct thread_vr_state vr_state; 191 struct thread_vr_state *vr_save_area; 192 unsigned long vrsave; 193 int used_vr; /* set if process has used altivec */ 194 #endif /* CONFIG_ALTIVEC */ 195 #ifdef CONFIG_VSX 196 /* VSR status */ 197 int used_vsr; /* set if process has used VSX */ 198 #endif /* CONFIG_VSX */ 199 #ifdef CONFIG_SPE 200 unsigned long evr[32]; /* upper 32-bits of SPE regs */ 201 u64 acc; /* Accumulator */ 202 unsigned long spefscr; /* SPE & eFP status */ 203 unsigned long spefscr_last; /* SPEFSCR value on last prctl 204 call or trap return */ 205 int used_spe; /* set if process has used spe */ 206 #endif /* CONFIG_SPE */ 207 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 208 u8 load_tm; 209 u64 tm_tfhar; /* Transaction fail handler addr */ 210 u64 tm_texasr; /* Transaction exception & summary */ 211 u64 tm_tfiar; /* Transaction fail instr address reg */ 212 struct pt_regs ckpt_regs; /* Checkpointed registers */ 213 214 unsigned long tm_tar; 215 unsigned long tm_ppr; 216 unsigned long tm_dscr; 217 218 /* 219 * Checkpointed FP and VSX 0-31 register set. 220 * 221 * When a transaction is active/signalled/scheduled etc., *regs is the 222 * most recent set of/speculated GPRs with ckpt_regs being the older 223 * checkpointed regs to which we roll back if transaction aborts. 224 * 225 * These are analogous to how ckpt_regs and pt_regs work 226 */ 227 struct thread_fp_state ckfp_state; /* Checkpointed FP state */ 228 struct thread_vr_state ckvr_state; /* Checkpointed VR state */ 229 unsigned long ckvrsave; /* Checkpointed VRSAVE */ 230 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ 231 #ifdef CONFIG_PPC_MEM_KEYS 232 unsigned long amr; 233 unsigned long iamr; 234 unsigned long uamor; 235 #endif 236 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER 237 void* kvm_shadow_vcpu; /* KVM internal data */ 238 #endif /* CONFIG_KVM_BOOK3S_32_HANDLER */ 239 #if defined(CONFIG_KVM) && defined(CONFIG_BOOKE) 240 struct kvm_vcpu *kvm_vcpu; 241 #endif 242 #ifdef CONFIG_PPC64 243 unsigned long dscr; 244 unsigned long fscr; 245 /* 246 * This member element dscr_inherit indicates that the process 247 * has explicitly attempted and changed the DSCR register value 248 * for itself. Hence kernel wont use the default CPU DSCR value 249 * contained in the PACA structure anymore during process context 250 * switch. Once this variable is set, this behaviour will also be 251 * inherited to all the children of this process from that point 252 * onwards. 253 */ 254 int dscr_inherit; 255 unsigned long tidr; 256 #endif 257 #ifdef CONFIG_PPC_BOOK3S_64 258 unsigned long tar; 259 unsigned long ebbrr; 260 unsigned long ebbhr; 261 unsigned long bescr; 262 unsigned long siar; 263 unsigned long sdar; 264 unsigned long sier; 265 unsigned long mmcr2; 266 unsigned mmcr0; 267 268 unsigned used_ebb; 269 unsigned int used_vas; 270 #endif 271 }; 272 273 #define ARCH_MIN_TASKALIGN 16 274 275 #define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack) 276 #define INIT_SP_LIMIT ((unsigned long)&init_stack) 277 278 #ifdef CONFIG_SPE 279 #define SPEFSCR_INIT \ 280 .spefscr = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE, \ 281 .spefscr_last = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE, 282 #else 283 #define SPEFSCR_INIT 284 #endif 285 286 #ifdef CONFIG_PPC32 287 #define INIT_THREAD { \ 288 .ksp = INIT_SP, \ 289 .ksp_limit = INIT_SP_LIMIT, \ 290 .addr_limit = KERNEL_DS, \ 291 .pgdir = swapper_pg_dir, \ 292 .fpexc_mode = MSR_FE0 | MSR_FE1, \ 293 SPEFSCR_INIT \ 294 } 295 #else 296 #define INIT_THREAD { \ 297 .ksp = INIT_SP, \ 298 .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \ 299 .addr_limit = KERNEL_DS, \ 300 .fpexc_mode = 0, \ 301 .fscr = FSCR_TAR | FSCR_EBB \ 302 } 303 #endif 304 305 #define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.regs) 306 307 unsigned long get_wchan(struct task_struct *p); 308 309 #define KSTK_EIP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0) 310 #define KSTK_ESP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0) 311 312 /* Get/set floating-point exception mode */ 313 #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr)) 314 #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val)) 315 316 extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr); 317 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val); 318 319 #define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr)) 320 #define SET_ENDIAN(tsk, val) set_endian((tsk), (val)) 321 322 extern int get_endian(struct task_struct *tsk, unsigned long adr); 323 extern int set_endian(struct task_struct *tsk, unsigned int val); 324 325 #define GET_UNALIGN_CTL(tsk, adr) get_unalign_ctl((tsk), (adr)) 326 #define SET_UNALIGN_CTL(tsk, val) set_unalign_ctl((tsk), (val)) 327 328 extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr); 329 extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val); 330 331 extern void load_fp_state(struct thread_fp_state *fp); 332 extern void store_fp_state(struct thread_fp_state *fp); 333 extern void load_vr_state(struct thread_vr_state *vr); 334 extern void store_vr_state(struct thread_vr_state *vr); 335 336 static inline unsigned int __unpack_fe01(unsigned long msr_bits) 337 { 338 return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8); 339 } 340 341 static inline unsigned long __pack_fe01(unsigned int fpmode) 342 { 343 return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1); 344 } 345 346 #ifdef CONFIG_PPC64 347 #define cpu_relax() do { HMT_low(); HMT_medium(); barrier(); } while (0) 348 349 #define spin_begin() HMT_low() 350 351 #define spin_cpu_relax() barrier() 352 353 #define spin_cpu_yield() spin_cpu_relax() 354 355 #define spin_end() HMT_medium() 356 357 #define spin_until_cond(cond) \ 358 do { \ 359 if (unlikely(!(cond))) { \ 360 spin_begin(); \ 361 do { \ 362 spin_cpu_relax(); \ 363 } while (!(cond)); \ 364 spin_end(); \ 365 } \ 366 } while (0) 367 368 #else 369 #define cpu_relax() barrier() 370 #endif 371 372 /* Check that a certain kernel stack pointer is valid in task_struct p */ 373 int validate_sp(unsigned long sp, struct task_struct *p, 374 unsigned long nbytes); 375 376 /* 377 * Prefetch macros. 378 */ 379 #define ARCH_HAS_PREFETCH 380 #define ARCH_HAS_PREFETCHW 381 #define ARCH_HAS_SPINLOCK_PREFETCH 382 383 static inline void prefetch(const void *x) 384 { 385 if (unlikely(!x)) 386 return; 387 388 __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x)); 389 } 390 391 static inline void prefetchw(const void *x) 392 { 393 if (unlikely(!x)) 394 return; 395 396 __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x)); 397 } 398 399 #define spin_lock_prefetch(x) prefetchw(x) 400 401 #define HAVE_ARCH_PICK_MMAP_LAYOUT 402 403 #ifdef CONFIG_PPC64 404 static inline unsigned long get_clean_sp(unsigned long sp, int is_32) 405 { 406 if (is_32) 407 return sp & 0x0ffffffffUL; 408 return sp; 409 } 410 #else 411 static inline unsigned long get_clean_sp(unsigned long sp, int is_32) 412 { 413 return sp; 414 } 415 #endif 416 417 /* asm stubs */ 418 extern unsigned long isa300_idle_stop_noloss(unsigned long psscr_val); 419 extern unsigned long isa300_idle_stop_mayloss(unsigned long psscr_val); 420 extern unsigned long isa206_idle_insn_mayloss(unsigned long type); 421 422 extern unsigned long cpuidle_disable; 423 enum idle_boot_override {IDLE_NO_OVERRIDE = 0, IDLE_POWERSAVE_OFF}; 424 425 extern int powersave_nap; /* set if nap mode can be used in idle loop */ 426 427 extern void power7_idle_type(unsigned long type); 428 extern void power9_idle_type(unsigned long stop_psscr_val, 429 unsigned long stop_psscr_mask); 430 431 extern void flush_instruction_cache(void); 432 extern void hard_reset_now(void); 433 extern void poweroff_now(void); 434 extern int fix_alignment(struct pt_regs *); 435 extern void cvt_fd(float *from, double *to); 436 extern void cvt_df(double *from, float *to); 437 extern void _nmask_and_or_msr(unsigned long nmask, unsigned long or_val); 438 439 #ifdef CONFIG_PPC64 440 /* 441 * We handle most unaligned accesses in hardware. On the other hand 442 * unaligned DMA can be very expensive on some ppc64 IO chips (it does 443 * powers of 2 writes until it reaches sufficient alignment). 444 * 445 * Based on this we disable the IP header alignment in network drivers. 446 */ 447 #define NET_IP_ALIGN 0 448 #endif 449 450 #endif /* __KERNEL__ */ 451 #endif /* __ASSEMBLY__ */ 452 #endif /* _ASM_POWERPC_PROCESSOR_H */ 453