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 <vdso/processor.h> 10 11 #include <asm/reg.h> 12 13 #ifdef CONFIG_VSX 14 #define TS_FPRWIDTH 2 15 16 #ifdef __BIG_ENDIAN__ 17 #define TS_FPROFFSET 0 18 #define TS_VSRLOWOFFSET 1 19 #else 20 #define TS_FPROFFSET 1 21 #define TS_VSRLOWOFFSET 0 22 #endif 23 24 #else 25 #define TS_FPRWIDTH 1 26 #define TS_FPROFFSET 0 27 #endif 28 29 #ifdef CONFIG_PPC64 30 /* Default SMT priority is set to 3. Use 11- 13bits to save priority. */ 31 #define PPR_PRIORITY 3 32 #ifdef __ASSEMBLY__ 33 #define DEFAULT_PPR (PPR_PRIORITY << 50) 34 #else 35 #define DEFAULT_PPR ((u64)PPR_PRIORITY << 50) 36 #endif /* __ASSEMBLY__ */ 37 #endif /* CONFIG_PPC64 */ 38 39 #ifndef __ASSEMBLY__ 40 #include <linux/types.h> 41 #include <linux/thread_info.h> 42 #include <asm/ptrace.h> 43 #include <asm/hw_breakpoint.h> 44 45 /* We do _not_ want to define new machine types at all, those must die 46 * in favor of using the device-tree 47 * -- BenH. 48 */ 49 50 /* PREP sub-platform types. Unused */ 51 #define _PREP_Motorola 0x01 /* motorola prep */ 52 #define _PREP_Firm 0x02 /* firmworks prep */ 53 #define _PREP_IBM 0x00 /* ibm prep */ 54 #define _PREP_Bull 0x03 /* bull prep */ 55 56 /* CHRP sub-platform types. These are arbitrary */ 57 #define _CHRP_Motorola 0x04 /* motorola chrp, the cobra */ 58 #define _CHRP_IBM 0x05 /* IBM chrp, the longtrail and longtrail 2 */ 59 #define _CHRP_Pegasos 0x06 /* Genesi/bplan's Pegasos and Pegasos2 */ 60 #define _CHRP_briq 0x07 /* TotalImpact's briQ */ 61 62 #if defined(__KERNEL__) && defined(CONFIG_PPC32) 63 64 extern int _chrp_type; 65 66 #endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */ 67 68 #ifdef __KERNEL__ 69 70 #ifdef CONFIG_PPC64 71 #include <asm/task_size_64.h> 72 #else 73 #include <asm/task_size_32.h> 74 #endif 75 76 struct task_struct; 77 void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp); 78 79 #define TS_FPR(i) fp_state.fpr[i][TS_FPROFFSET] 80 #define TS_CKFPR(i) ckfp_state.fpr[i][TS_FPROFFSET] 81 82 /* FP and VSX 0-31 register set */ 83 struct thread_fp_state { 84 u64 fpr[32][TS_FPRWIDTH] __attribute__((aligned(16))); 85 u64 fpscr; /* Floating point status */ 86 }; 87 88 /* Complete AltiVec register set including VSCR */ 89 struct thread_vr_state { 90 vector128 vr[32] __attribute__((aligned(16))); 91 vector128 vscr __attribute__((aligned(16))); 92 }; 93 94 struct debug_reg { 95 #ifdef CONFIG_PPC_ADV_DEBUG_REGS 96 /* 97 * The following help to manage the use of Debug Control Registers 98 * om the BookE platforms. 99 */ 100 uint32_t dbcr0; 101 uint32_t dbcr1; 102 #ifdef CONFIG_BOOKE 103 uint32_t dbcr2; 104 #endif 105 /* 106 * The stored value of the DBSR register will be the value at the 107 * last debug interrupt. This register can only be read from the 108 * user (will never be written to) and has value while helping to 109 * describe the reason for the last debug trap. Torez 110 */ 111 uint32_t dbsr; 112 /* 113 * The following will contain addresses used by debug applications 114 * to help trace and trap on particular address locations. 115 * The bits in the Debug Control Registers above help define which 116 * of the following registers will contain valid data and/or addresses. 117 */ 118 unsigned long iac1; 119 unsigned long iac2; 120 #if CONFIG_PPC_ADV_DEBUG_IACS > 2 121 unsigned long iac3; 122 unsigned long iac4; 123 #endif 124 unsigned long dac1; 125 unsigned long dac2; 126 #if CONFIG_PPC_ADV_DEBUG_DVCS > 0 127 unsigned long dvc1; 128 unsigned long dvc2; 129 #endif 130 #endif 131 }; 132 133 struct thread_struct { 134 unsigned long ksp; /* Kernel stack pointer */ 135 136 #ifdef CONFIG_PPC64 137 unsigned long ksp_vsid; 138 #endif 139 struct pt_regs *regs; /* Pointer to saved register state */ 140 #ifdef CONFIG_BOOKE 141 /* BookE base exception scratch space; align on cacheline */ 142 unsigned long normsave[8] ____cacheline_aligned; 143 #endif 144 #ifdef CONFIG_PPC32 145 void *pgdir; /* root of page-table tree */ 146 #ifdef CONFIG_PPC_RTAS 147 unsigned long rtas_sp; /* stack pointer for when in RTAS */ 148 #endif 149 #if defined(CONFIG_PPC_BOOK3S_32) && defined(CONFIG_PPC_KUAP) 150 unsigned long kuap; /* opened segments for user access */ 151 #endif 152 unsigned long srr0; 153 unsigned long srr1; 154 unsigned long dar; 155 unsigned long dsisr; 156 #ifdef CONFIG_PPC_BOOK3S_32 157 unsigned long r0, r3, r4, r5, r6, r8, r9, r11; 158 unsigned long lr, ctr; 159 unsigned long sr0; 160 #endif 161 #endif /* CONFIG_PPC32 */ 162 #if defined(CONFIG_BOOKE_OR_40x) && defined(CONFIG_PPC_KUAP) 163 unsigned long pid; /* value written in PID reg. at interrupt exit */ 164 #endif 165 /* Debug Registers */ 166 struct debug_reg debug; 167 #ifdef CONFIG_PPC_FPU_REGS 168 struct thread_fp_state fp_state; 169 struct thread_fp_state *fp_save_area; 170 #endif 171 int fpexc_mode; /* floating-point exception mode */ 172 unsigned int align_ctl; /* alignment handling control */ 173 #ifdef CONFIG_HAVE_HW_BREAKPOINT 174 struct perf_event *ptrace_bps[HBP_NUM_MAX]; 175 #endif /* CONFIG_HAVE_HW_BREAKPOINT */ 176 struct arch_hw_breakpoint hw_brk[HBP_NUM_MAX]; /* hardware breakpoint info */ 177 unsigned long trap_nr; /* last trap # on this thread */ 178 u8 load_slb; /* Ages out SLB preload cache entries */ 179 u8 load_fp; 180 #ifdef CONFIG_ALTIVEC 181 u8 load_vec; 182 struct thread_vr_state vr_state; 183 struct thread_vr_state *vr_save_area; 184 unsigned long vrsave; 185 int used_vr; /* set if process has used altivec */ 186 #endif /* CONFIG_ALTIVEC */ 187 #ifdef CONFIG_VSX 188 /* VSR status */ 189 int used_vsr; /* set if process has used VSX */ 190 #endif /* CONFIG_VSX */ 191 #ifdef CONFIG_SPE 192 struct_group(spe, 193 unsigned long evr[32]; /* upper 32-bits of SPE regs */ 194 u64 acc; /* Accumulator */ 195 ); 196 unsigned long spefscr; /* SPE & eFP status */ 197 unsigned long spefscr_last; /* SPEFSCR value on last prctl 198 call or trap return */ 199 int used_spe; /* set if process has used spe */ 200 #endif /* CONFIG_SPE */ 201 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 202 u8 load_tm; 203 u64 tm_tfhar; /* Transaction fail handler addr */ 204 u64 tm_texasr; /* Transaction exception & summary */ 205 u64 tm_tfiar; /* Transaction fail instr address reg */ 206 struct pt_regs ckpt_regs; /* Checkpointed registers */ 207 208 unsigned long tm_tar; 209 unsigned long tm_ppr; 210 unsigned long tm_dscr; 211 unsigned long tm_amr; 212 213 /* 214 * Checkpointed FP and VSX 0-31 register set. 215 * 216 * When a transaction is active/signalled/scheduled etc., *regs is the 217 * most recent set of/speculated GPRs with ckpt_regs being the older 218 * checkpointed regs to which we roll back if transaction aborts. 219 * 220 * These are analogous to how ckpt_regs and pt_regs work 221 */ 222 struct thread_fp_state ckfp_state; /* Checkpointed FP state */ 223 struct thread_vr_state ckvr_state; /* Checkpointed VR state */ 224 unsigned long ckvrsave; /* Checkpointed VRSAVE */ 225 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */ 226 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER 227 void* kvm_shadow_vcpu; /* KVM internal data */ 228 #endif /* CONFIG_KVM_BOOK3S_32_HANDLER */ 229 #if defined(CONFIG_KVM) && defined(CONFIG_BOOKE) 230 struct kvm_vcpu *kvm_vcpu; 231 #endif 232 #ifdef CONFIG_PPC64 233 unsigned long dscr; 234 unsigned long fscr; 235 /* 236 * This member element dscr_inherit indicates that the process 237 * has explicitly attempted and changed the DSCR register value 238 * for itself. Hence kernel wont use the default CPU DSCR value 239 * contained in the PACA structure anymore during process context 240 * switch. Once this variable is set, this behaviour will also be 241 * inherited to all the children of this process from that point 242 * onwards. 243 */ 244 int dscr_inherit; 245 unsigned long tidr; 246 #endif 247 #ifdef CONFIG_PPC_BOOK3S_64 248 unsigned long tar; 249 unsigned long ebbrr; 250 unsigned long ebbhr; 251 unsigned long bescr; 252 unsigned long siar; 253 unsigned long sdar; 254 unsigned long sier; 255 unsigned long mmcr2; 256 unsigned mmcr0; 257 258 unsigned used_ebb; 259 unsigned long mmcr3; 260 unsigned long sier2; 261 unsigned long sier3; 262 unsigned long hashkeyr; 263 unsigned long dexcr; 264 265 #endif 266 }; 267 268 #define ARCH_MIN_TASKALIGN 16 269 270 #define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack) 271 #define INIT_SP_LIMIT ((unsigned long)&init_stack) 272 273 #ifdef CONFIG_SPE 274 #define SPEFSCR_INIT \ 275 .spefscr = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE, \ 276 .spefscr_last = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE, 277 #else 278 #define SPEFSCR_INIT 279 #endif 280 281 #ifdef CONFIG_PPC_BOOK3S_32 282 #define SR0_INIT .sr0 = IS_ENABLED(CONFIG_PPC_KUEP) ? SR_NX : 0, 283 #else 284 #define SR0_INIT 285 #endif 286 287 #if defined(CONFIG_PPC_BOOK3S_32) && defined(CONFIG_PPC_KUAP) 288 #define INIT_THREAD { \ 289 .ksp = INIT_SP, \ 290 .pgdir = swapper_pg_dir, \ 291 .kuap = ~0UL, /* KUAP_NONE */ \ 292 .fpexc_mode = MSR_FE0 | MSR_FE1, \ 293 SPEFSCR_INIT \ 294 SR0_INIT \ 295 } 296 #elif defined(CONFIG_PPC32) 297 #define INIT_THREAD { \ 298 .ksp = INIT_SP, \ 299 .pgdir = swapper_pg_dir, \ 300 .fpexc_mode = MSR_FE0 | MSR_FE1, \ 301 SPEFSCR_INIT \ 302 SR0_INIT \ 303 } 304 #else 305 #define INIT_THREAD { \ 306 .ksp = INIT_SP, \ 307 .fpexc_mode = 0, \ 308 } 309 #endif 310 311 #define task_pt_regs(tsk) ((tsk)->thread.regs) 312 313 unsigned long __get_wchan(struct task_struct *p); 314 315 #define KSTK_EIP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0) 316 #define KSTK_ESP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0) 317 318 /* Get/set floating-point exception mode */ 319 #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr)) 320 #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val)) 321 322 extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr); 323 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val); 324 325 #define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr)) 326 #define SET_ENDIAN(tsk, val) set_endian((tsk), (val)) 327 328 extern int get_endian(struct task_struct *tsk, unsigned long adr); 329 extern int set_endian(struct task_struct *tsk, unsigned int val); 330 331 #define GET_UNALIGN_CTL(tsk, adr) get_unalign_ctl((tsk), (adr)) 332 #define SET_UNALIGN_CTL(tsk, val) set_unalign_ctl((tsk), (val)) 333 334 extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr); 335 extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val); 336 337 extern void load_fp_state(struct thread_fp_state *fp); 338 extern void store_fp_state(struct thread_fp_state *fp); 339 extern void load_vr_state(struct thread_vr_state *vr); 340 extern void store_vr_state(struct thread_vr_state *vr); 341 342 static inline unsigned int __unpack_fe01(unsigned long msr_bits) 343 { 344 return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8); 345 } 346 347 static inline unsigned long __pack_fe01(unsigned int fpmode) 348 { 349 return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1); 350 } 351 352 #ifdef CONFIG_PPC64 353 354 #define spin_begin() \ 355 asm volatile(ASM_FTR_IFCLR( \ 356 "or 1,1,1", /* HMT_LOW */ \ 357 "nop", /* v3.1 uses pause_short in cpu_relax instead */ \ 358 %0) :: "i" (CPU_FTR_ARCH_31) : "memory") 359 360 #define spin_cpu_relax() \ 361 asm volatile(ASM_FTR_IFCLR( \ 362 "nop", /* Before v3.1 use priority nops in spin_begin/end */ \ 363 PPC_WAIT(2, 0), /* aka pause_short */ \ 364 %0) :: "i" (CPU_FTR_ARCH_31) : "memory") 365 366 #define spin_end() \ 367 asm volatile(ASM_FTR_IFCLR( \ 368 "or 2,2,2", /* HMT_MEDIUM */ \ 369 "nop", \ 370 %0) :: "i" (CPU_FTR_ARCH_31) : "memory") 371 372 #endif 373 374 /* 375 * Check that a certain kernel stack pointer is a valid (minimum sized) 376 * stack frame in task_struct p. 377 */ 378 int validate_sp(unsigned long sp, struct task_struct *p); 379 380 /* 381 * validate the stack frame of a particular minimum size, used for when we are 382 * looking at a certain object in the stack beyond the minimum. 383 */ 384 int validate_sp_size(unsigned long sp, struct task_struct *p, 385 unsigned long nbytes); 386 387 /* 388 * Prefetch macros. 389 */ 390 #define ARCH_HAS_PREFETCH 391 #define ARCH_HAS_PREFETCHW 392 393 static inline void prefetch(const void *x) 394 { 395 if (unlikely(!x)) 396 return; 397 398 __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x)); 399 } 400 401 static inline void prefetchw(const void *x) 402 { 403 if (unlikely(!x)) 404 return; 405 406 __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x)); 407 } 408 409 /* asm stubs */ 410 extern unsigned long isa300_idle_stop_noloss(unsigned long psscr_val); 411 extern unsigned long isa300_idle_stop_mayloss(unsigned long psscr_val); 412 extern unsigned long isa206_idle_insn_mayloss(unsigned long type); 413 #ifdef CONFIG_PPC_970_NAP 414 extern void power4_idle_nap(void); 415 void power4_idle_nap_return(void); 416 #endif 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 arch300_idle_type(unsigned long stop_psscr_val, 425 unsigned long stop_psscr_mask); 426 void pnv_power9_force_smt4_catch(void); 427 void pnv_power9_force_smt4_release(void); 428 429 extern int fix_alignment(struct pt_regs *); 430 431 #ifdef CONFIG_PPC64 432 /* 433 * We handle most unaligned accesses in hardware. On the other hand 434 * unaligned DMA can be very expensive on some ppc64 IO chips (it does 435 * powers of 2 writes until it reaches sufficient alignment). 436 * 437 * Based on this we disable the IP header alignment in network drivers. 438 */ 439 #define NET_IP_ALIGN 0 440 #endif 441 442 int do_mathemu(struct pt_regs *regs); 443 int do_spe_mathemu(struct pt_regs *regs); 444 int speround_handler(struct pt_regs *regs); 445 446 /* VMX copying */ 447 int enter_vmx_usercopy(void); 448 int exit_vmx_usercopy(void); 449 int enter_vmx_ops(void); 450 void *exit_vmx_ops(void *dest); 451 452 #endif /* __KERNEL__ */ 453 #endif /* __ASSEMBLY__ */ 454 #endif /* _ASM_POWERPC_PROCESSOR_H */ 455