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 extern int have_of; 73 74 struct task_struct; 75 void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp); 76 void release_thread(struct task_struct *); 77 78 /* Prepare to copy thread state - unlazy all lazy status */ 79 extern void prepare_to_copy(struct task_struct *tsk); 80 81 /* Create a new kernel thread. */ 82 extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); 83 84 /* Lazy FPU handling on uni-processor */ 85 extern struct task_struct *last_task_used_math; 86 extern struct task_struct *last_task_used_altivec; 87 extern struct task_struct *last_task_used_vsx; 88 extern struct task_struct *last_task_used_spe; 89 90 #ifdef CONFIG_PPC32 91 92 #if CONFIG_TASK_SIZE > CONFIG_KERNEL_START 93 #error User TASK_SIZE overlaps with KERNEL_START address 94 #endif 95 #define TASK_SIZE (CONFIG_TASK_SIZE) 96 97 /* This decides where the kernel will search for a free chunk of vm 98 * space during mmap's. 99 */ 100 #define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3) 101 #endif 102 103 #ifdef CONFIG_PPC64 104 /* 64-bit user address space is 44-bits (16TB user VM) */ 105 #define TASK_SIZE_USER64 (0x0000100000000000UL) 106 107 /* 108 * 32-bit user address space is 4GB - 1 page 109 * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT 110 */ 111 #define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE)) 112 113 #define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \ 114 TASK_SIZE_USER32 : TASK_SIZE_USER64) 115 #define TASK_SIZE TASK_SIZE_OF(current) 116 117 /* This decides where the kernel will search for a free chunk of vm 118 * space during mmap's. 119 */ 120 #define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4)) 121 #define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(TASK_SIZE_USER64 / 4)) 122 123 #define TASK_UNMAPPED_BASE ((test_thread_flag(TIF_32BIT)) ? \ 124 TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 ) 125 #endif 126 127 #ifdef __KERNEL__ 128 #ifdef __powerpc64__ 129 130 #define STACK_TOP_USER64 TASK_SIZE_USER64 131 #define STACK_TOP_USER32 TASK_SIZE_USER32 132 133 #define STACK_TOP (test_thread_flag(TIF_32BIT) ? \ 134 STACK_TOP_USER32 : STACK_TOP_USER64) 135 136 #define STACK_TOP_MAX STACK_TOP_USER64 137 138 #else /* __powerpc64__ */ 139 140 #define STACK_TOP TASK_SIZE 141 #define STACK_TOP_MAX STACK_TOP 142 143 #endif /* __powerpc64__ */ 144 #endif /* __KERNEL__ */ 145 146 typedef struct { 147 unsigned long seg; 148 } mm_segment_t; 149 150 #define TS_FPROFFSET 0 151 #define TS_VSRLOWOFFSET 1 152 #define TS_FPR(i) fpr[i][TS_FPROFFSET] 153 154 struct thread_struct { 155 unsigned long ksp; /* Kernel stack pointer */ 156 unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */ 157 158 #ifdef CONFIG_PPC64 159 unsigned long ksp_vsid; 160 #endif 161 struct pt_regs *regs; /* Pointer to saved register state */ 162 mm_segment_t fs; /* for get_fs() validation */ 163 #ifdef CONFIG_PPC32 164 void *pgdir; /* root of page-table tree */ 165 #endif 166 #if defined(CONFIG_4xx) || defined (CONFIG_BOOKE) 167 unsigned long dbcr0; /* debug control register values */ 168 unsigned long dbcr1; 169 #endif 170 /* FP and VSX 0-31 register set */ 171 double fpr[32][TS_FPRWIDTH]; 172 struct { 173 174 unsigned int pad; 175 unsigned int val; /* Floating point status */ 176 } fpscr; 177 int fpexc_mode; /* floating-point exception mode */ 178 unsigned int align_ctl; /* alignment handling control */ 179 #ifdef CONFIG_PPC64 180 unsigned long start_tb; /* Start purr when proc switched in */ 181 unsigned long accum_tb; /* Total accumilated purr for process */ 182 #endif 183 unsigned long dabr; /* Data address breakpoint register */ 184 #ifdef CONFIG_ALTIVEC 185 /* Complete AltiVec register set */ 186 vector128 vr[32] __attribute__((aligned(16))); 187 /* AltiVec status */ 188 vector128 vscr __attribute__((aligned(16))); 189 unsigned long vrsave; 190 int used_vr; /* set if process has used altivec */ 191 #endif /* CONFIG_ALTIVEC */ 192 #ifdef CONFIG_VSX 193 /* VSR status */ 194 int used_vsr; /* set if process has used altivec */ 195 #endif /* CONFIG_VSX */ 196 #ifdef CONFIG_SPE 197 unsigned long evr[32]; /* upper 32-bits of SPE regs */ 198 u64 acc; /* Accumulator */ 199 unsigned long spefscr; /* SPE & eFP status */ 200 int used_spe; /* set if process has used spe */ 201 #endif /* CONFIG_SPE */ 202 }; 203 204 #define ARCH_MIN_TASKALIGN 16 205 206 #define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack) 207 #define INIT_SP_LIMIT \ 208 (_ALIGN_UP(sizeof(init_thread_info), 16) + (unsigned long) &init_stack) 209 210 211 #ifdef CONFIG_PPC32 212 #define INIT_THREAD { \ 213 .ksp = INIT_SP, \ 214 .ksp_limit = INIT_SP_LIMIT, \ 215 .fs = KERNEL_DS, \ 216 .pgdir = swapper_pg_dir, \ 217 .fpexc_mode = MSR_FE0 | MSR_FE1, \ 218 } 219 #else 220 #define INIT_THREAD { \ 221 .ksp = INIT_SP, \ 222 .ksp_limit = INIT_SP_LIMIT, \ 223 .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \ 224 .fs = KERNEL_DS, \ 225 .fpr = {{0}}, \ 226 .fpscr = { .val = 0, }, \ 227 .fpexc_mode = 0, \ 228 } 229 #endif 230 231 /* 232 * Return saved PC of a blocked thread. For now, this is the "user" PC 233 */ 234 #define thread_saved_pc(tsk) \ 235 ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0) 236 237 #define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.regs) 238 239 unsigned long get_wchan(struct task_struct *p); 240 241 #define KSTK_EIP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0) 242 #define KSTK_ESP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0) 243 244 /* Get/set floating-point exception mode */ 245 #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr)) 246 #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val)) 247 248 extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr); 249 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val); 250 251 #define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr)) 252 #define SET_ENDIAN(tsk, val) set_endian((tsk), (val)) 253 254 extern int get_endian(struct task_struct *tsk, unsigned long adr); 255 extern int set_endian(struct task_struct *tsk, unsigned int val); 256 257 #define GET_UNALIGN_CTL(tsk, adr) get_unalign_ctl((tsk), (adr)) 258 #define SET_UNALIGN_CTL(tsk, val) set_unalign_ctl((tsk), (val)) 259 260 extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr); 261 extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val); 262 263 static inline unsigned int __unpack_fe01(unsigned long msr_bits) 264 { 265 return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8); 266 } 267 268 static inline unsigned long __pack_fe01(unsigned int fpmode) 269 { 270 return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1); 271 } 272 273 #ifdef CONFIG_PPC64 274 #define cpu_relax() do { HMT_low(); HMT_medium(); barrier(); } while (0) 275 #else 276 #define cpu_relax() barrier() 277 #endif 278 279 /* Check that a certain kernel stack pointer is valid in task_struct p */ 280 int validate_sp(unsigned long sp, struct task_struct *p, 281 unsigned long nbytes); 282 283 /* 284 * Prefetch macros. 285 */ 286 #define ARCH_HAS_PREFETCH 287 #define ARCH_HAS_PREFETCHW 288 #define ARCH_HAS_SPINLOCK_PREFETCH 289 290 static inline void prefetch(const void *x) 291 { 292 if (unlikely(!x)) 293 return; 294 295 __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x)); 296 } 297 298 static inline void prefetchw(const void *x) 299 { 300 if (unlikely(!x)) 301 return; 302 303 __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x)); 304 } 305 306 #define spin_lock_prefetch(x) prefetchw(x) 307 308 #ifdef CONFIG_PPC64 309 #define HAVE_ARCH_PICK_MMAP_LAYOUT 310 #endif 311 312 #endif /* __KERNEL__ */ 313 #endif /* __ASSEMBLY__ */ 314 #endif /* _ASM_POWERPC_PROCESSOR_H */ 315