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 #else 18 #define TS_FPRWIDTH 1 19 #endif 20 21 #ifndef __ASSEMBLY__ 22 #include <linux/compiler.h> 23 #include <linux/cache.h> 24 #include <asm/ptrace.h> 25 #include <asm/types.h> 26 27 /* We do _not_ want to define new machine types at all, those must die 28 * in favor of using the device-tree 29 * -- BenH. 30 */ 31 32 /* PREP sub-platform types see residual.h for these */ 33 #define _PREP_Motorola 0x01 /* motorola prep */ 34 #define _PREP_Firm 0x02 /* firmworks prep */ 35 #define _PREP_IBM 0x00 /* ibm prep */ 36 #define _PREP_Bull 0x03 /* bull prep */ 37 38 /* CHRP sub-platform types. These are arbitrary */ 39 #define _CHRP_Motorola 0x04 /* motorola chrp, the cobra */ 40 #define _CHRP_IBM 0x05 /* IBM chrp, the longtrail and longtrail 2 */ 41 #define _CHRP_Pegasos 0x06 /* Genesi/bplan's Pegasos and Pegasos2 */ 42 #define _CHRP_briq 0x07 /* TotalImpact's briQ */ 43 44 #if defined(__KERNEL__) && defined(CONFIG_PPC32) 45 46 extern int _chrp_type; 47 48 #ifdef CONFIG_PPC_PREP 49 50 /* what kind of prep workstation we are */ 51 extern int _prep_type; 52 53 #endif /* CONFIG_PPC_PREP */ 54 55 #endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */ 56 57 /* 58 * Default implementation of macro that returns current 59 * instruction pointer ("program counter"). 60 */ 61 #define current_text_addr() ({ __label__ _l; _l: &&_l;}) 62 63 /* Macros for adjusting thread priority (hardware multi-threading) */ 64 #define HMT_very_low() asm volatile("or 31,31,31 # very low priority") 65 #define HMT_low() asm volatile("or 1,1,1 # low priority") 66 #define HMT_medium_low() asm volatile("or 6,6,6 # medium low priority") 67 #define HMT_medium() asm volatile("or 2,2,2 # medium priority") 68 #define HMT_medium_high() asm volatile("or 5,5,5 # medium high priority") 69 #define HMT_high() asm volatile("or 3,3,3 # high priority") 70 71 #ifdef __KERNEL__ 72 73 struct task_struct; 74 void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp); 75 void release_thread(struct task_struct *); 76 77 /* Prepare to copy thread state - unlazy all lazy status */ 78 extern void prepare_to_copy(struct task_struct *tsk); 79 80 /* Create a new kernel thread. */ 81 extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); 82 83 /* Lazy FPU handling on uni-processor */ 84 extern struct task_struct *last_task_used_math; 85 extern struct task_struct *last_task_used_altivec; 86 extern struct task_struct *last_task_used_vsx; 87 extern struct task_struct *last_task_used_spe; 88 89 #ifdef CONFIG_PPC32 90 91 #if CONFIG_TASK_SIZE > CONFIG_KERNEL_START 92 #error User TASK_SIZE overlaps with KERNEL_START address 93 #endif 94 #define TASK_SIZE (CONFIG_TASK_SIZE) 95 96 /* This decides where the kernel will search for a free chunk of vm 97 * space during mmap's. 98 */ 99 #define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3) 100 #endif 101 102 #ifdef CONFIG_PPC64 103 /* 64-bit user address space is 44-bits (16TB user VM) */ 104 #define TASK_SIZE_USER64 (0x0000100000000000UL) 105 106 /* 107 * 32-bit user address space is 4GB - 1 page 108 * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT 109 */ 110 #define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE)) 111 112 #define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \ 113 TASK_SIZE_USER32 : TASK_SIZE_USER64) 114 #define TASK_SIZE TASK_SIZE_OF(current) 115 116 /* This decides where the kernel will search for a free chunk of vm 117 * space during mmap's. 118 */ 119 #define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4)) 120 #define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(TASK_SIZE_USER64 / 4)) 121 122 #define TASK_UNMAPPED_BASE ((is_32bit_task()) ? \ 123 TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 ) 124 #endif 125 126 #ifdef __powerpc64__ 127 128 #define STACK_TOP_USER64 TASK_SIZE_USER64 129 #define STACK_TOP_USER32 TASK_SIZE_USER32 130 131 #define STACK_TOP (is_32bit_task() ? \ 132 STACK_TOP_USER32 : STACK_TOP_USER64) 133 134 #define STACK_TOP_MAX STACK_TOP_USER64 135 136 #else /* __powerpc64__ */ 137 138 #define STACK_TOP TASK_SIZE 139 #define STACK_TOP_MAX STACK_TOP 140 141 #endif /* __powerpc64__ */ 142 143 typedef struct { 144 unsigned long seg; 145 } mm_segment_t; 146 147 #define TS_FPROFFSET 0 148 #define TS_VSRLOWOFFSET 1 149 #define TS_FPR(i) fpr[i][TS_FPROFFSET] 150 151 struct thread_struct { 152 unsigned long ksp; /* Kernel stack pointer */ 153 unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */ 154 155 #ifdef CONFIG_PPC64 156 unsigned long ksp_vsid; 157 #endif 158 struct pt_regs *regs; /* Pointer to saved register state */ 159 mm_segment_t fs; /* for get_fs() validation */ 160 #ifdef CONFIG_BOOKE 161 /* BookE base exception scratch space; align on cacheline */ 162 unsigned long normsave[8] ____cacheline_aligned; 163 #endif 164 #ifdef CONFIG_PPC32 165 void *pgdir; /* root of page-table tree */ 166 #endif 167 #ifdef CONFIG_PPC_ADV_DEBUG_REGS 168 /* 169 * The following help to manage the use of Debug Control Registers 170 * om the BookE platforms. 171 */ 172 unsigned long dbcr0; 173 unsigned long dbcr1; 174 #ifdef CONFIG_BOOKE 175 unsigned long dbcr2; 176 #endif 177 /* 178 * The stored value of the DBSR register will be the value at the 179 * last debug interrupt. This register can only be read from the 180 * user (will never be written to) and has value while helping to 181 * describe the reason for the last debug trap. Torez 182 */ 183 unsigned long dbsr; 184 /* 185 * The following will contain addresses used by debug applications 186 * to help trace and trap on particular address locations. 187 * The bits in the Debug Control Registers above help define which 188 * of the following registers will contain valid data and/or addresses. 189 */ 190 unsigned long iac1; 191 unsigned long iac2; 192 #if CONFIG_PPC_ADV_DEBUG_IACS > 2 193 unsigned long iac3; 194 unsigned long iac4; 195 #endif 196 unsigned long dac1; 197 unsigned long dac2; 198 #if CONFIG_PPC_ADV_DEBUG_DVCS > 0 199 unsigned long dvc1; 200 unsigned long dvc2; 201 #endif 202 #endif 203 /* FP and VSX 0-31 register set */ 204 double fpr[32][TS_FPRWIDTH]; 205 struct { 206 207 unsigned int pad; 208 unsigned int val; /* Floating point status */ 209 } fpscr; 210 int fpexc_mode; /* floating-point exception mode */ 211 unsigned int align_ctl; /* alignment handling control */ 212 #ifdef CONFIG_PPC64 213 unsigned long start_tb; /* Start purr when proc switched in */ 214 unsigned long accum_tb; /* Total accumilated purr for process */ 215 #ifdef CONFIG_HAVE_HW_BREAKPOINT 216 struct perf_event *ptrace_bps[HBP_NUM]; 217 /* 218 * Helps identify source of single-step exception and subsequent 219 * hw-breakpoint enablement 220 */ 221 struct perf_event *last_hit_ubp; 222 #endif /* CONFIG_HAVE_HW_BREAKPOINT */ 223 #endif 224 unsigned long dabr; /* Data address breakpoint register */ 225 #ifdef CONFIG_ALTIVEC 226 /* Complete AltiVec register set */ 227 vector128 vr[32] __attribute__((aligned(16))); 228 /* AltiVec status */ 229 vector128 vscr __attribute__((aligned(16))); 230 unsigned long vrsave; 231 int used_vr; /* set if process has used altivec */ 232 #endif /* CONFIG_ALTIVEC */ 233 #ifdef CONFIG_VSX 234 /* VSR status */ 235 int used_vsr; /* set if process has used altivec */ 236 #endif /* CONFIG_VSX */ 237 #ifdef CONFIG_SPE 238 unsigned long evr[32]; /* upper 32-bits of SPE regs */ 239 u64 acc; /* Accumulator */ 240 unsigned long spefscr; /* SPE & eFP status */ 241 int used_spe; /* set if process has used spe */ 242 #endif /* CONFIG_SPE */ 243 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER 244 void* kvm_shadow_vcpu; /* KVM internal data */ 245 #endif /* CONFIG_KVM_BOOK3S_32_HANDLER */ 246 #ifdef CONFIG_PPC64 247 unsigned long dscr; 248 int dscr_inherit; 249 #endif 250 }; 251 252 #define ARCH_MIN_TASKALIGN 16 253 254 #define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack) 255 #define INIT_SP_LIMIT \ 256 (_ALIGN_UP(sizeof(init_thread_info), 16) + (unsigned long) &init_stack) 257 258 #ifdef CONFIG_SPE 259 #define SPEFSCR_INIT .spefscr = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE, 260 #else 261 #define SPEFSCR_INIT 262 #endif 263 264 #ifdef CONFIG_PPC32 265 #define INIT_THREAD { \ 266 .ksp = INIT_SP, \ 267 .ksp_limit = INIT_SP_LIMIT, \ 268 .fs = KERNEL_DS, \ 269 .pgdir = swapper_pg_dir, \ 270 .fpexc_mode = MSR_FE0 | MSR_FE1, \ 271 SPEFSCR_INIT \ 272 } 273 #else 274 #define INIT_THREAD { \ 275 .ksp = INIT_SP, \ 276 .ksp_limit = INIT_SP_LIMIT, \ 277 .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \ 278 .fs = KERNEL_DS, \ 279 .fpr = {{0}}, \ 280 .fpscr = { .val = 0, }, \ 281 .fpexc_mode = 0, \ 282 } 283 #endif 284 285 /* 286 * Return saved PC of a blocked thread. For now, this is the "user" PC 287 */ 288 #define thread_saved_pc(tsk) \ 289 ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0) 290 291 #define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.regs) 292 293 unsigned long get_wchan(struct task_struct *p); 294 295 #define KSTK_EIP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0) 296 #define KSTK_ESP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0) 297 298 /* Get/set floating-point exception mode */ 299 #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr)) 300 #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val)) 301 302 extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr); 303 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val); 304 305 #define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr)) 306 #define SET_ENDIAN(tsk, val) set_endian((tsk), (val)) 307 308 extern int get_endian(struct task_struct *tsk, unsigned long adr); 309 extern int set_endian(struct task_struct *tsk, unsigned int val); 310 311 #define GET_UNALIGN_CTL(tsk, adr) get_unalign_ctl((tsk), (adr)) 312 #define SET_UNALIGN_CTL(tsk, val) set_unalign_ctl((tsk), (val)) 313 314 extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr); 315 extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val); 316 317 static inline unsigned int __unpack_fe01(unsigned long msr_bits) 318 { 319 return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8); 320 } 321 322 static inline unsigned long __pack_fe01(unsigned int fpmode) 323 { 324 return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1); 325 } 326 327 #ifdef CONFIG_PPC64 328 #define cpu_relax() do { HMT_low(); HMT_medium(); barrier(); } while (0) 329 #else 330 #define cpu_relax() barrier() 331 #endif 332 333 /* Check that a certain kernel stack pointer is valid in task_struct p */ 334 int validate_sp(unsigned long sp, struct task_struct *p, 335 unsigned long nbytes); 336 337 /* 338 * Prefetch macros. 339 */ 340 #define ARCH_HAS_PREFETCH 341 #define ARCH_HAS_PREFETCHW 342 #define ARCH_HAS_SPINLOCK_PREFETCH 343 344 static inline void prefetch(const void *x) 345 { 346 if (unlikely(!x)) 347 return; 348 349 __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x)); 350 } 351 352 static inline void prefetchw(const void *x) 353 { 354 if (unlikely(!x)) 355 return; 356 357 __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x)); 358 } 359 360 #define spin_lock_prefetch(x) prefetchw(x) 361 362 #ifdef CONFIG_PPC64 363 #define HAVE_ARCH_PICK_MMAP_LAYOUT 364 #endif 365 366 #ifdef CONFIG_PPC64 367 static inline unsigned long get_clean_sp(struct pt_regs *regs, int is_32) 368 { 369 unsigned long sp; 370 371 if (is_32) 372 sp = regs->gpr[1] & 0x0ffffffffUL; 373 else 374 sp = regs->gpr[1]; 375 376 return sp; 377 } 378 #else 379 static inline unsigned long get_clean_sp(struct pt_regs *regs, int is_32) 380 { 381 return regs->gpr[1]; 382 } 383 #endif 384 385 #endif /* __KERNEL__ */ 386 #endif /* __ASSEMBLY__ */ 387 #endif /* _ASM_POWERPC_PROCESSOR_H */ 388