arch/powerpc/include/asm/processor.h

   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         /* Debug Registers */
 167         struct debug_reg debug;
 168         struct thread_fp_state  fp_state;
 169         struct thread_fp_state  *fp_save_area;
 170         int             fpexc_mode;     /* floating-point exception mode */
 171         unsigned int    align_ctl;      /* alignment handling control */
 172 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 173         struct perf_event *ptrace_bps[HBP_NUM];
 174         /*
 175          * Helps identify source of single-step exception and subsequent
 176          * hw-breakpoint enablement
 177          */
 178         struct perf_event *last_hit_ubp;
 179 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
 180         struct arch_hw_breakpoint hw_brk; /* info on the hardware breakpoint */
 181         unsigned long   trap_nr;        /* last trap # on this thread */
 182         u8 load_slb;                    /* Ages out SLB preload cache entries */
 183         u8 load_fp;
 184 #ifdef CONFIG_ALTIVEC
 185         u8 load_vec;
 186         struct thread_vr_state vr_state;
 187         struct thread_vr_state *vr_save_area;
 188         unsigned long   vrsave;
 189         int             used_vr;        /* set if process has used altivec */
 190 #endif /* CONFIG_ALTIVEC */
 191 #ifdef CONFIG_VSX
 192         /* VSR status */
 193         int             used_vsr;       /* set if process has used VSX */
 194 #endif /* CONFIG_VSX */
 195 #ifdef CONFIG_SPE
 196         unsigned long   evr[32];        /* upper 32-bits of SPE regs */
 197         u64             acc;            /* Accumulator */
 198         unsigned long   spefscr;        /* SPE & eFP status */
 199         unsigned long   spefscr_last;   /* SPEFSCR value on last prctl
 200                                            call or trap return */
 201         int             used_spe;       /* set if process has used spe */
 202 #endif /* CONFIG_SPE */
 203 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 204         u8      load_tm;
 205         u64             tm_tfhar;       /* Transaction fail handler addr */
 206         u64             tm_texasr;      /* Transaction exception & summary */
 207         u64             tm_tfiar;       /* Transaction fail instr address reg */
 208         struct pt_regs  ckpt_regs;      /* Checkpointed registers */
 209
 210         unsigned long   tm_tar;
 211         unsigned long   tm_ppr;
 212         unsigned long   tm_dscr;
 213
 214         /*
 215          * Checkpointed FP and VSX 0-31 register set.
 216          *
 217          * When a transaction is active/signalled/scheduled etc., *regs is the
 218          * most recent set of/speculated GPRs with ckpt_regs being the older
 219          * checkpointed regs to which we roll back if transaction aborts.
 220          *
 221          * These are analogous to how ckpt_regs and pt_regs work
 222          */
 223         struct thread_fp_state ckfp_state; /* Checkpointed FP state */
 224         struct thread_vr_state ckvr_state; /* Checkpointed VR state */
 225         unsigned long   ckvrsave; /* Checkpointed VRSAVE */
 226 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
 227 #ifdef CONFIG_PPC_MEM_KEYS
 228         unsigned long   amr;
 229         unsigned long   iamr;
 230         unsigned long   uamor;
 231 #endif
 232 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
 233         void*           kvm_shadow_vcpu; /* KVM internal data */
 234 #endif /* CONFIG_KVM_BOOK3S_32_HANDLER */
 235 #if defined(CONFIG_KVM) && defined(CONFIG_BOOKE)
 236         struct kvm_vcpu *kvm_vcpu;
 237 #endif
 238 #ifdef CONFIG_PPC64
 239         unsigned long   dscr;
 240         unsigned long   fscr;
 241         /*
 242          * This member element dscr_inherit indicates that the process
 243          * has explicitly attempted and changed the DSCR register value
 244          * for itself. Hence kernel wont use the default CPU DSCR value
 245          * contained in the PACA structure anymore during process context
 246          * switch. Once this variable is set, this behaviour will also be
 247          * inherited to all the children of this process from that point
 248          * onwards.
 249          */
 250         int             dscr_inherit;
 251         unsigned long   tidr;
 252 #endif
 253 #ifdef CONFIG_PPC_BOOK3S_64
 254         unsigned long   tar;
 255         unsigned long   ebbrr;
 256         unsigned long   ebbhr;
 257         unsigned long   bescr;
 258         unsigned long   siar;
 259         unsigned long   sdar;
 260         unsigned long   sier;
 261         unsigned long   mmcr2;
 262         unsigned        mmcr0;
 263
 264         unsigned        used_ebb;
 265         unsigned int    used_vas;
 266 #endif
 267 };
 268
 269 #define ARCH_MIN_TASKALIGN 16
 270
 271 #define INIT_SP         (sizeof(init_stack) + (unsigned long) &init_stack)
 272 #define INIT_SP_LIMIT   ((unsigned long)&init_stack)
 273
 274 #ifdef CONFIG_SPE
 275 #define SPEFSCR_INIT \
 276         .spefscr = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE, \
 277         .spefscr_last = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE,
 278 #else
 279 #define SPEFSCR_INIT
 280 #endif
 281
 282 #ifdef CONFIG_PPC32
 283 #define INIT_THREAD { \
 284         .ksp = INIT_SP, \
 285         .ksp_limit = INIT_SP_LIMIT, \
 286         .addr_limit = KERNEL_DS, \
 287         .pgdir = swapper_pg_dir, \
 288         .fpexc_mode = MSR_FE0 | MSR_FE1, \
 289         SPEFSCR_INIT \
 290 }
 291 #else
 292 #define INIT_THREAD  { \
 293         .ksp = INIT_SP, \
 294         .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
 295         .addr_limit = KERNEL_DS, \
 296         .fpexc_mode = 0, \
 297         .fscr = FSCR_TAR | FSCR_EBB \
 298 }
 299 #endif
 300
 301 #define task_pt_regs(tsk)       ((struct pt_regs *)(tsk)->thread.regs)
 302
 303 unsigned long get_wchan(struct task_struct *p);
 304
 305 #define KSTK_EIP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
 306 #define KSTK_ESP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
 307
 308 /* Get/set floating-point exception mode */
 309 #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
 310 #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
 311
 312 extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
 313 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
 314
 315 #define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr))
 316 #define SET_ENDIAN(tsk, val) set_endian((tsk), (val))
 317
 318 extern int get_endian(struct task_struct *tsk, unsigned long adr);
 319 extern int set_endian(struct task_struct *tsk, unsigned int val);
 320
 321 #define GET_UNALIGN_CTL(tsk, adr)       get_unalign_ctl((tsk), (adr))
 322 #define SET_UNALIGN_CTL(tsk, val)       set_unalign_ctl((tsk), (val))
 323
 324 extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
 325 extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
 326
 327 extern void load_fp_state(struct thread_fp_state *fp);
 328 extern void store_fp_state(struct thread_fp_state *fp);
 329 extern void load_vr_state(struct thread_vr_state *vr);
 330 extern void store_vr_state(struct thread_vr_state *vr);
 331
 332 static inline unsigned int __unpack_fe01(unsigned long msr_bits)
 333 {
 334         return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
 335 }
 336
 337 static inline unsigned long __pack_fe01(unsigned int fpmode)
 338 {
 339         return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
 340 }
 341
 342 #ifdef CONFIG_PPC64
 343 #define cpu_relax()     do { HMT_low(); HMT_medium(); barrier(); } while (0)
 344
 345 #define spin_begin()    HMT_low()
 346
 347 #define spin_cpu_relax()        barrier()
 348
 349 #define spin_cpu_yield()        spin_cpu_relax()
 350
 351 #define spin_end()      HMT_medium()
 352
 353 #define spin_until_cond(cond)                                   \
 354 do {                                                            \
 355         if (unlikely(!(cond))) {                                \
 356                 spin_begin();                                   \
 357                 do {                                            \
 358                         spin_cpu_relax();                       \
 359                 } while (!(cond));                              \
 360                 spin_end();                                     \
 361         }                                                       \
 362 } while (0)
 363
 364 #else
 365 #define cpu_relax()     barrier()
 366 #endif
 367
 368 /* Check that a certain kernel stack pointer is valid in task_struct p */
 369 int validate_sp(unsigned long sp, struct task_struct *p,
 370                        unsigned long nbytes);
 371
 372 /*
 373  * Prefetch macros.
 374  */
 375 #define ARCH_HAS_PREFETCH
 376 #define ARCH_HAS_PREFETCHW
 377 #define ARCH_HAS_SPINLOCK_PREFETCH
 378
 379 static inline void prefetch(const void *x)
 380 {
 381         if (unlikely(!x))
 382                 return;
 383
 384         __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
 385 }
 386
 387 static inline void prefetchw(const void *x)
 388 {
 389         if (unlikely(!x))
 390                 return;
 391
 392         __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
 393 }
 394
 395 #define spin_lock_prefetch(x)   prefetchw(x)
 396
 397 #define HAVE_ARCH_PICK_MMAP_LAYOUT
 398
 399 #ifdef CONFIG_PPC64
 400 static inline unsigned long get_clean_sp(unsigned long sp, int is_32)
 401 {
 402         if (is_32)
 403                 return sp & 0x0ffffffffUL;
 404         return sp;
 405 }
 406 #else
 407 static inline unsigned long get_clean_sp(unsigned long sp, int is_32)
 408 {
 409         return sp;
 410 }
 411 #endif
 412
 413 /* asm stubs */
 414 extern unsigned long isa300_idle_stop_noloss(unsigned long psscr_val);
 415 extern unsigned long isa300_idle_stop_mayloss(unsigned long psscr_val);
 416 extern unsigned long isa206_idle_insn_mayloss(unsigned long type);
 417
 418 extern unsigned long cpuidle_disable;
 419 enum idle_boot_override {IDLE_NO_OVERRIDE = 0, IDLE_POWERSAVE_OFF};
 420
 421 extern int powersave_nap;       /* set if nap mode can be used in idle loop */
 422
 423 extern void power7_idle_type(unsigned long type);
 424 extern void power9_idle_type(unsigned long stop_psscr_val,
 425                               unsigned long stop_psscr_mask);
 426
 427 extern void flush_instruction_cache(void);
 428 extern void hard_reset_now(void);
 429 extern void poweroff_now(void);
 430 extern int fix_alignment(struct pt_regs *);
 431 extern void cvt_fd(float *from, double *to);
 432 extern void cvt_df(double *from, float *to);
 433 extern void _nmask_and_or_msr(unsigned long nmask, unsigned long or_val);
 434
 435 #ifdef CONFIG_PPC64
 436 /*
 437  * We handle most unaligned accesses in hardware. On the other hand
 438  * unaligned DMA can be very expensive on some ppc64 IO chips (it does
 439  * powers of 2 writes until it reaches sufficient alignment).
 440  *
 441  * Based on this we disable the IP header alignment in network drivers.
 442  */
 443 #define NET_IP_ALIGN    0
 444 #endif
 445
 446 #endif /* __KERNEL__ */
 447 #endif /* __ASSEMBLY__ */
 448 #endif /* _ASM_POWERPC_PROCESSOR_H */