1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 #ifndef _ASM_POWERPC_PROCESSOR_H 3 #define _ASM_POWERPC_PROCESSOR_H 4 5 /* 6 * Copyright (C) 2001 PPC 64 Team, IBM Corp 7 */ 8 9 #include <asm/reg.h> 10 11 #ifdef CONFIG_VSX 12 #define TS_FPRWIDTH 2 13 14 #ifdef __BIG_ENDIAN__ 15 #define TS_FPROFFSET 0 16 #define TS_VSRLOWOFFSET 1 17 #else 18 #define TS_FPROFFSET 1 19 #define TS_VSRLOWOFFSET 0 20 #endif 21 22 #else 23 #define TS_FPRWIDTH 1 24 #define TS_FPROFFSET 0 25 #endif 26 27 #ifdef CONFIG_PPC64 28 /* Default SMT priority is set to 3. Use 11- 13bits to save priority. */ 29 #define PPR_PRIORITY 3 30 #ifdef __ASSEMBLY__ 31 #define DEFAULT_PPR (PPR_PRIORITY << 50) 32 #else 33 #define DEFAULT_PPR ((u64)PPR_PRIORITY << 50) 34 #endif /* __ASSEMBLY__ */ 35 #endif /* CONFIG_PPC64 */ 36 37 #ifndef __ASSEMBLY__ 38 #include <linux/types.h> 39 #include <linux/thread_info.h> 40 #include <asm/ptrace.h> 41 #include <asm/hw_breakpoint.h> 42 43 /* We do _not_ want to define new machine types at all, those must die 44 * in favor of using the device-tree 45 * -- BenH. 46 */ 47 48 /* PREP sub-platform types. Unused */ 49 #define _PREP_Motorola 0x01 /* motorola prep */ 50 #define _PREP_Firm 0x02 /* firmworks prep */ 51 #define _PREP_IBM 0x00 /* ibm prep */ 52 #define _PREP_Bull 0x03 /* bull prep */ 53 54 /* CHRP sub-platform types. These are arbitrary */ 55 #define _CHRP_Motorola 0x04 /* motorola chrp, the cobra */ 56 #define _CHRP_IBM 0x05 /* IBM chrp, the longtrail and longtrail 2 */ 57 #define _CHRP_Pegasos 0x06 /* Genesi/bplan's Pegasos and Pegasos2 */ 58 #define _CHRP_briq 0x07 /* TotalImpact's briQ */ 59 60 #if defined(__KERNEL__) && defined(CONFIG_PPC32) 61 62 extern int _chrp_type; 63 64 #endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */ 65 66 /* Macros for adjusting thread priority (hardware multi-threading) */ 67 #define HMT_very_low() asm volatile("or 31,31,31 # very low priority") 68 #define HMT_low() asm volatile("or 1,1,1 # low priority") 69 #define HMT_medium_low() asm volatile("or 6,6,6 # medium low priority") 70 #define HMT_medium() asm volatile("or 2,2,2 # medium priority") 71 #define HMT_medium_high() asm volatile("or 5,5,5 # medium high priority") 72 #define HMT_high() asm volatile("or 3,3,3 # high priority") 73 74 #ifdef __KERNEL__ 75 76 #ifdef CONFIG_PPC64 77 #include <asm/task_size_64.h> 78 #else 79 #include <asm/task_size_32.h> 80 #endif 81 82 struct task_struct; 83 void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp); 84 void release_thread(struct task_struct *); 85 86 typedef struct { 87 unsigned long seg; 88 } mm_segment_t; 89 90 #define TS_FPR(i) fp_state.fpr[i][TS_FPROFFSET] 91 #define TS_CKFPR(i) ckfp_state.fpr[i][TS_FPROFFSET] 92 93 /* FP and VSX 0-31 register set */ 94 struct thread_fp_state { 95 u64 fpr[32][TS_FPRWIDTH] __attribute__((aligned(16))); 96 u64 fpscr; /* Floating point status */ 97 }; 98 99 /* Complete AltiVec register set including VSCR */ 100 struct thread_vr_state { 101 vector128 vr[32] __attribute__((aligned(16))); 102 vector128 vscr __attribute__((aligned(16))); 103 }; 104 105 struct debug_reg { 106 #ifdef CONFIG_PPC_ADV_DEBUG_REGS 107 /* 108 * The following help to manage the use of Debug Control Registers 109 * om the BookE platforms. 110 */ 111 uint32_t dbcr0; 112 uint32_t dbcr1; 113 #ifdef CONFIG_BOOKE 114 uint32_t dbcr2; 115 #endif 116 /* 117 * The stored value of the DBSR register will be the value at the 118 * last debug interrupt. This register can only be read from the 119 * user (will never be written to) and has value while helping to 120 * describe the reason for the last debug trap. Torez 121 */ 122 uint32_t dbsr; 123 /* 124 * The following will contain addresses used by debug applications 125 * to help trace and trap on particular address locations. 126 * The bits in the Debug Control Registers above help define which 127 * of the following registers will contain valid data and/or addresses. 128 */ 129 unsigned long iac1; 130 unsigned long iac2; 131 #if CONFIG_PPC_ADV_DEBUG_IACS > 2 132 unsigned long iac3; 133 unsigned long iac4; 134 #endif 135 unsigned long dac1; 136 unsigned long dac2; 137 #if CONFIG_PPC_ADV_DEBUG_DVCS > 0 138 unsigned long dvc1; 139 unsigned long dvc2; 140 #endif 141 #endif 142 }; 143 144 struct thread_struct { 145 unsigned long ksp; /* Kernel stack pointer */ 146 147 #ifdef CONFIG_PPC64 148 unsigned long ksp_vsid; 149 #endif 150 struct pt_regs *regs; /* Pointer to saved register state */ 151 mm_segment_t addr_limit; /* for get_fs() validation */ 152 #ifdef CONFIG_BOOKE 153 /* BookE base exception scratch space; align on cacheline */ 154 unsigned long normsave[8] ____cacheline_aligned; 155 #endif 156 #ifdef CONFIG_PPC32 157 void *pgdir; /* root of page-table tree */ 158 unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */ 159 #ifdef CONFIG_PPC_RTAS 160 unsigned long rtas_sp; /* stack pointer for when in RTAS */ 161 #endif 162 #endif 163 #if defined(CONFIG_PPC_BOOK3S_32) && defined(CONFIG_PPC_KUAP) 164 unsigned long kuap; /* opened segments for user access */ 165 #endif 166 #ifdef CONFIG_VMAP_STACK 167 unsigned long srr0; 168 unsigned long srr1; 169 unsigned long dar; 170 unsigned long dsisr; 171 #endif 172 /* Debug Registers */ 173 struct debug_reg debug; 174 struct thread_fp_state fp_state; 175 struct thread_fp_state *fp_save_area; 176 int fpexc_mode; /* floating-point exception mode */ 177 unsigned int align_ctl; /* alignment handling control */ 178 #ifdef CONFIG_HAVE_HW_BREAKPOINT 179 struct perf_event *ptrace_bps[HBP_NUM]; 180 /* 181 * Helps identify source of single-step exception and subsequent 182 * hw-breakpoint enablement 183 */ 184 struct perf_event *last_hit_ubp; 185 #endif /* CONFIG_HAVE_HW_BREAKPOINT */ 186 struct arch_hw_breakpoint hw_brk; /* info on the hardware breakpoint */ 187 unsigned long trap_nr; /* last trap # on this thread */ 188 u8 load_slb; /* Ages out SLB preload cache entries */ 189 u8 load_fp; 190 #ifdef CONFIG_ALTIVEC 191 u8 load_vec; 192 struct thread_vr_state vr_state; 193 struct thread_vr_state *vr_save_area; 194 unsigned long vrsave; 195 int used_vr; /* set if process has used altivec */ 196 #endif /* CONFIG_ALTIVEC */ 197 #ifdef CONFIG_VSX 198 /* VSR status */ 199 int used_vsr; /* set if process has used VSX */ 200 #endif /* CONFIG_VSX */ 201 #ifdef CONFIG_SPE 202 unsigned long evr[32]; /* upper 32-bits of SPE regs */ 203 u64 acc; /* Accumulator */ 204 unsigned long spefscr; /* SPE & eFP status */ 205 unsigned long spefscr_last; /* SPEFSCR value on last prctl 206 call or trap return */ 207 int used_spe; /* set if process has used spe */ 208 #endif /* CONFIG_SPE */ 209 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 210 u8 load_tm; 211 u64 tm_tfhar; /* Transaction fail handler addr */ 212 u64 tm_texasr; /* Transaction exception & summary */ 213 u64 tm_tfiar; /* Transaction fail instr address reg */ 214 struct pt_regs ckpt_regs; /* Checkpointed registers */ 215 216 unsigned long tm_tar; 217 unsigned long tm_ppr; 218 unsigned long tm_dscr; 219 220 /* 221 * Checkpointed FP and VSX 0-31 register set. 222 * 223 * When a transaction is active/signalled/scheduled etc., *regs is the 224 * most recent set of/speculated GPRs with ckpt_regs being the older 225 * checkpointed regs to which we roll back if transaction aborts. 226 * 227 * These are analogous to how ckpt_regs and pt_regs work 228 */ 229 struct thread_fp_state ckfp_state; /* Checkpointed FP state */ 230 struct thread_vr_state ckvr_state; /* Checkpointed VR state */ 231 unsigned long ckvrsave; /* Checkpointed VRSAVE */ 232 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ 233 #ifdef CONFIG_PPC_MEM_KEYS 234 unsigned long amr; 235 unsigned long iamr; 236 unsigned long uamor; 237 #endif 238 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER 239 void* kvm_shadow_vcpu; /* KVM internal data */ 240 #endif /* CONFIG_KVM_BOOK3S_32_HANDLER */ 241 #if defined(CONFIG_KVM) && defined(CONFIG_BOOKE) 242 struct kvm_vcpu *kvm_vcpu; 243 #endif 244 #ifdef CONFIG_PPC64 245 unsigned long dscr; 246 unsigned long fscr; 247 /* 248 * This member element dscr_inherit indicates that the process 249 * has explicitly attempted and changed the DSCR register value 250 * for itself. Hence kernel wont use the default CPU DSCR value 251 * contained in the PACA structure anymore during process context 252 * switch. Once this variable is set, this behaviour will also be 253 * inherited to all the children of this process from that point 254 * onwards. 255 */ 256 int dscr_inherit; 257 unsigned long tidr; 258 #endif 259 #ifdef CONFIG_PPC_BOOK3S_64 260 unsigned long tar; 261 unsigned long ebbrr; 262 unsigned long ebbhr; 263 unsigned long bescr; 264 unsigned long siar; 265 unsigned long sdar; 266 unsigned long sier; 267 unsigned long mmcr2; 268 unsigned mmcr0; 269 270 unsigned used_ebb; 271 unsigned int used_vas; 272 #endif 273 }; 274 275 #define ARCH_MIN_TASKALIGN 16 276 277 #define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack) 278 #define INIT_SP_LIMIT ((unsigned long)&init_stack) 279 280 #ifdef CONFIG_SPE 281 #define SPEFSCR_INIT \ 282 .spefscr = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE, \ 283 .spefscr_last = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE, 284 #else 285 #define SPEFSCR_INIT 286 #endif 287 288 #ifdef CONFIG_PPC32 289 #define INIT_THREAD { \ 290 .ksp = INIT_SP, \ 291 .ksp_limit = INIT_SP_LIMIT, \ 292 .addr_limit = KERNEL_DS, \ 293 .pgdir = swapper_pg_dir, \ 294 .fpexc_mode = MSR_FE0 | MSR_FE1, \ 295 SPEFSCR_INIT \ 296 } 297 #else 298 #define INIT_THREAD { \ 299 .ksp = INIT_SP, \ 300 .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \ 301 .addr_limit = KERNEL_DS, \ 302 .fpexc_mode = 0, \ 303 .fscr = FSCR_TAR | FSCR_EBB \ 304 } 305 #endif 306 307 #define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.regs) 308 309 unsigned long get_wchan(struct task_struct *p); 310 311 #define KSTK_EIP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0) 312 #define KSTK_ESP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0) 313 314 /* Get/set floating-point exception mode */ 315 #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr)) 316 #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val)) 317 318 extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr); 319 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val); 320 321 #define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr)) 322 #define SET_ENDIAN(tsk, val) set_endian((tsk), (val)) 323 324 extern int get_endian(struct task_struct *tsk, unsigned long adr); 325 extern int set_endian(struct task_struct *tsk, unsigned int val); 326 327 #define GET_UNALIGN_CTL(tsk, adr) get_unalign_ctl((tsk), (adr)) 328 #define SET_UNALIGN_CTL(tsk, val) set_unalign_ctl((tsk), (val)) 329 330 extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr); 331 extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val); 332 333 extern void load_fp_state(struct thread_fp_state *fp); 334 extern void store_fp_state(struct thread_fp_state *fp); 335 extern void load_vr_state(struct thread_vr_state *vr); 336 extern void store_vr_state(struct thread_vr_state *vr); 337 338 static inline unsigned int __unpack_fe01(unsigned long msr_bits) 339 { 340 return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8); 341 } 342 343 static inline unsigned long __pack_fe01(unsigned int fpmode) 344 { 345 return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1); 346 } 347 348 #ifdef CONFIG_PPC64 349 #define cpu_relax() do { HMT_low(); HMT_medium(); barrier(); } while (0) 350 351 #define spin_begin() HMT_low() 352 353 #define spin_cpu_relax() barrier() 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 #ifdef CONFIG_PPC_970_NAP 422 extern void power4_idle_nap(void); 423 #endif 424 425 extern unsigned long cpuidle_disable; 426 enum idle_boot_override {IDLE_NO_OVERRIDE = 0, IDLE_POWERSAVE_OFF}; 427 428 extern int powersave_nap; /* set if nap mode can be used in idle loop */ 429 430 extern void power7_idle_type(unsigned long type); 431 extern void power9_idle_type(unsigned long stop_psscr_val, 432 unsigned long stop_psscr_mask); 433 434 extern void flush_instruction_cache(void); 435 extern void hard_reset_now(void); 436 extern void poweroff_now(void); 437 extern int fix_alignment(struct pt_regs *); 438 extern void cvt_fd(float *from, double *to); 439 extern void cvt_df(double *from, float *to); 440 extern void _nmask_and_or_msr(unsigned long nmask, unsigned long or_val); 441 442 #ifdef CONFIG_PPC64 443 /* 444 * We handle most unaligned accesses in hardware. On the other hand 445 * unaligned DMA can be very expensive on some ppc64 IO chips (it does 446 * powers of 2 writes until it reaches sufficient alignment). 447 * 448 * Based on this we disable the IP header alignment in network drivers. 449 */ 450 #define NET_IP_ALIGN 0 451 #endif 452 453 #endif /* __KERNEL__ */ 454 #endif /* __ASSEMBLY__ */ 455 #endif /* _ASM_POWERPC_PROCESSOR_H */ 456