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 <asm/ptrace.h> 24 #include <asm/types.h> 25 26 /* We do _not_ want to define new machine types at all, those must die 27 * in favor of using the device-tree 28 * -- BenH. 29 */ 30 31 /* PREP sub-platform types see residual.h for these */ 32 #define _PREP_Motorola 0x01 /* motorola prep */ 33 #define _PREP_Firm 0x02 /* firmworks prep */ 34 #define _PREP_IBM 0x00 /* ibm prep */ 35 #define _PREP_Bull 0x03 /* bull prep */ 36 37 /* CHRP sub-platform types. These are arbitrary */ 38 #define _CHRP_Motorola 0x04 /* motorola chrp, the cobra */ 39 #define _CHRP_IBM 0x05 /* IBM chrp, the longtrail and longtrail 2 */ 40 #define _CHRP_Pegasos 0x06 /* Genesi/bplan's Pegasos and Pegasos2 */ 41 #define _CHRP_briq 0x07 /* TotalImpact's briQ */ 42 43 #if defined(__KERNEL__) && defined(CONFIG_PPC32) 44 45 extern int _chrp_type; 46 47 #ifdef CONFIG_PPC_PREP 48 49 /* what kind of prep workstation we are */ 50 extern int _prep_type; 51 52 #endif /* CONFIG_PPC_PREP */ 53 54 #endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */ 55 56 /* 57 * Default implementation of macro that returns current 58 * instruction pointer ("program counter"). 59 */ 60 #define current_text_addr() ({ __label__ _l; _l: &&_l;}) 61 62 /* Macros for adjusting thread priority (hardware multi-threading) */ 63 #define HMT_very_low() asm volatile("or 31,31,31 # very low priority") 64 #define HMT_low() asm volatile("or 1,1,1 # low priority") 65 #define HMT_medium_low() asm volatile("or 6,6,6 # medium low priority") 66 #define HMT_medium() asm volatile("or 2,2,2 # medium priority") 67 #define HMT_medium_high() asm volatile("or 5,5,5 # medium high priority") 68 #define HMT_high() asm volatile("or 3,3,3 # high priority") 69 70 #ifdef __KERNEL__ 71 72 struct task_struct; 73 void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp); 74 void release_thread(struct task_struct *); 75 76 /* Prepare to copy thread state - unlazy all lazy status */ 77 extern void prepare_to_copy(struct task_struct *tsk); 78 79 /* Create a new kernel thread. */ 80 extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); 81 82 /* Lazy FPU handling on uni-processor */ 83 extern struct task_struct *last_task_used_math; 84 extern struct task_struct *last_task_used_altivec; 85 extern struct task_struct *last_task_used_vsx; 86 extern struct task_struct *last_task_used_spe; 87 88 #ifdef CONFIG_PPC32 89 90 #if CONFIG_TASK_SIZE > CONFIG_KERNEL_START 91 #error User TASK_SIZE overlaps with KERNEL_START address 92 #endif 93 #define TASK_SIZE (CONFIG_TASK_SIZE) 94 95 /* This decides where the kernel will search for a free chunk of vm 96 * space during mmap's. 97 */ 98 #define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3) 99 #endif 100 101 #ifdef CONFIG_PPC64 102 /* 64-bit user address space is 44-bits (16TB user VM) */ 103 #define TASK_SIZE_USER64 (0x0000100000000000UL) 104 105 /* 106 * 32-bit user address space is 4GB - 1 page 107 * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT 108 */ 109 #define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE)) 110 111 #define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \ 112 TASK_SIZE_USER32 : TASK_SIZE_USER64) 113 #define TASK_SIZE TASK_SIZE_OF(current) 114 115 /* This decides where the kernel will search for a free chunk of vm 116 * space during mmap's. 117 */ 118 #define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4)) 119 #define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(TASK_SIZE_USER64 / 4)) 120 121 #define TASK_UNMAPPED_BASE ((test_thread_flag(TIF_32BIT)) ? \ 122 TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 ) 123 #endif 124 125 #ifdef __KERNEL__ 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 (test_thread_flag(TIF_32BIT) ? \ 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 #endif /* __KERNEL__ */ 143 144 typedef struct { 145 unsigned long seg; 146 } mm_segment_t; 147 148 #define TS_FPROFFSET 0 149 #define TS_VSRLOWOFFSET 1 150 #define TS_FPR(i) fpr[i][TS_FPROFFSET] 151 152 struct thread_struct { 153 unsigned long ksp; /* Kernel stack pointer */ 154 unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */ 155 156 #ifdef CONFIG_PPC64 157 unsigned long ksp_vsid; 158 #endif 159 struct pt_regs *regs; /* Pointer to saved register state */ 160 mm_segment_t fs; /* for get_fs() validation */ 161 #ifdef CONFIG_PPC32 162 void *pgdir; /* root of page-table tree */ 163 #endif 164 #if defined(CONFIG_4xx) || defined (CONFIG_BOOKE) 165 unsigned long dbcr0; /* debug control register values */ 166 unsigned long dbcr1; 167 #endif 168 /* FP and VSX 0-31 register set */ 169 double fpr[32][TS_FPRWIDTH]; 170 struct { 171 172 unsigned int pad; 173 unsigned int val; /* Floating point status */ 174 } fpscr; 175 int fpexc_mode; /* floating-point exception mode */ 176 unsigned int align_ctl; /* alignment handling control */ 177 #ifdef CONFIG_PPC64 178 unsigned long start_tb; /* Start purr when proc switched in */ 179 unsigned long accum_tb; /* Total accumilated purr for process */ 180 #endif 181 unsigned long dabr; /* Data address breakpoint register */ 182 #ifdef CONFIG_ALTIVEC 183 /* Complete AltiVec register set */ 184 vector128 vr[32] __attribute__((aligned(16))); 185 /* AltiVec status */ 186 vector128 vscr __attribute__((aligned(16))); 187 unsigned long vrsave; 188 int used_vr; /* set if process has used altivec */ 189 #endif /* CONFIG_ALTIVEC */ 190 #ifdef CONFIG_VSX 191 /* VSR status */ 192 int used_vsr; /* set if process has used altivec */ 193 #endif /* CONFIG_VSX */ 194 #ifdef CONFIG_SPE 195 unsigned long evr[32]; /* upper 32-bits of SPE regs */ 196 u64 acc; /* Accumulator */ 197 unsigned long spefscr; /* SPE & eFP status */ 198 int used_spe; /* set if process has used spe */ 199 #endif /* CONFIG_SPE */ 200 }; 201 202 #define ARCH_MIN_TASKALIGN 16 203 204 #define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack) 205 #define INIT_SP_LIMIT \ 206 (_ALIGN_UP(sizeof(init_thread_info), 16) + (unsigned long) &init_stack) 207 208 #ifdef CONFIG_SPE 209 #define SPEFSCR_INIT .spefscr = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE, 210 #else 211 #define SPEFSCR_INIT 212 #endif 213 214 #ifdef CONFIG_PPC32 215 #define INIT_THREAD { \ 216 .ksp = INIT_SP, \ 217 .ksp_limit = INIT_SP_LIMIT, \ 218 .fs = KERNEL_DS, \ 219 .pgdir = swapper_pg_dir, \ 220 .fpexc_mode = MSR_FE0 | MSR_FE1, \ 221 SPEFSCR_INIT \ 222 } 223 #else 224 #define INIT_THREAD { \ 225 .ksp = INIT_SP, \ 226 .ksp_limit = INIT_SP_LIMIT, \ 227 .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \ 228 .fs = KERNEL_DS, \ 229 .fpr = {{0}}, \ 230 .fpscr = { .val = 0, }, \ 231 .fpexc_mode = 0, \ 232 } 233 #endif 234 235 /* 236 * Return saved PC of a blocked thread. For now, this is the "user" PC 237 */ 238 #define thread_saved_pc(tsk) \ 239 ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0) 240 241 #define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.regs) 242 243 unsigned long get_wchan(struct task_struct *p); 244 245 #define KSTK_EIP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0) 246 #define KSTK_ESP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0) 247 248 /* Get/set floating-point exception mode */ 249 #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr)) 250 #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val)) 251 252 extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr); 253 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val); 254 255 #define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr)) 256 #define SET_ENDIAN(tsk, val) set_endian((tsk), (val)) 257 258 extern int get_endian(struct task_struct *tsk, unsigned long adr); 259 extern int set_endian(struct task_struct *tsk, unsigned int val); 260 261 #define GET_UNALIGN_CTL(tsk, adr) get_unalign_ctl((tsk), (adr)) 262 #define SET_UNALIGN_CTL(tsk, val) set_unalign_ctl((tsk), (val)) 263 264 extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr); 265 extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val); 266 267 static inline unsigned int __unpack_fe01(unsigned long msr_bits) 268 { 269 return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8); 270 } 271 272 static inline unsigned long __pack_fe01(unsigned int fpmode) 273 { 274 return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1); 275 } 276 277 #ifdef CONFIG_PPC64 278 #define cpu_relax() do { HMT_low(); HMT_medium(); barrier(); } while (0) 279 #else 280 #define cpu_relax() barrier() 281 #endif 282 283 /* Check that a certain kernel stack pointer is valid in task_struct p */ 284 int validate_sp(unsigned long sp, struct task_struct *p, 285 unsigned long nbytes); 286 287 /* 288 * Prefetch macros. 289 */ 290 #define ARCH_HAS_PREFETCH 291 #define ARCH_HAS_PREFETCHW 292 #define ARCH_HAS_SPINLOCK_PREFETCH 293 294 static inline void prefetch(const void *x) 295 { 296 if (unlikely(!x)) 297 return; 298 299 __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x)); 300 } 301 302 static inline void prefetchw(const void *x) 303 { 304 if (unlikely(!x)) 305 return; 306 307 __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x)); 308 } 309 310 #define spin_lock_prefetch(x) prefetchw(x) 311 312 #ifdef CONFIG_PPC64 313 #define HAVE_ARCH_PICK_MMAP_LAYOUT 314 #endif 315 316 #ifdef CONFIG_PPC64 317 static inline unsigned long get_clean_sp(struct pt_regs *regs, int is_32) 318 { 319 unsigned long sp; 320 321 if (is_32) 322 sp = regs->gpr[1] & 0x0ffffffffUL; 323 else 324 sp = regs->gpr[1]; 325 326 return sp; 327 } 328 #else 329 static inline unsigned long get_clean_sp(struct pt_regs *regs, int is_32) 330 { 331 return regs->gpr[1]; 332 } 333 #endif 334 335 #endif /* __KERNEL__ */ 336 #endif /* __ASSEMBLY__ */ 337 #endif /* _ASM_POWERPC_PROCESSOR_H */ 338