1 /* 2 * include/asm-parisc/processor.h 3 * 4 * Copyright (C) 1994 Linus Torvalds 5 * Copyright (C) 2001 Grant Grundler 6 */ 7 8 #ifndef __ASM_PARISC_PROCESSOR_H 9 #define __ASM_PARISC_PROCESSOR_H 10 11 #ifndef __ASSEMBLY__ 12 #include <linux/threads.h> 13 14 #include <asm/prefetch.h> 15 #include <asm/hardware.h> 16 #include <asm/pdc.h> 17 #include <asm/ptrace.h> 18 #include <asm/types.h> 19 #include <asm/percpu.h> 20 #endif /* __ASSEMBLY__ */ 21 22 /* 23 * Default implementation of macro that returns current 24 * instruction pointer ("program counter"). 25 */ 26 #ifdef CONFIG_PA20 27 #define current_ia(x) __asm__("mfia %0" : "=r"(x)) 28 #else /* mfia added in pa2.0 */ 29 #define current_ia(x) __asm__("blr 0,%0\n\tnop" : "=r"(x)) 30 #endif 31 #define current_text_addr() ({ void *pc; current_ia(pc); pc; }) 32 33 #define HAVE_ARCH_PICK_MMAP_LAYOUT 34 35 #define TASK_SIZE_OF(tsk) ((tsk)->thread.task_size) 36 #define TASK_SIZE TASK_SIZE_OF(current) 37 #define TASK_UNMAPPED_BASE (current->thread.map_base) 38 39 #define DEFAULT_TASK_SIZE32 (0xFFF00000UL) 40 #define DEFAULT_MAP_BASE32 (0x40000000UL) 41 42 #ifdef CONFIG_64BIT 43 #define DEFAULT_TASK_SIZE (MAX_ADDRESS-0xf000000) 44 #define DEFAULT_MAP_BASE (0x200000000UL) 45 #else 46 #define DEFAULT_TASK_SIZE DEFAULT_TASK_SIZE32 47 #define DEFAULT_MAP_BASE DEFAULT_MAP_BASE32 48 #endif 49 50 #ifdef __KERNEL__ 51 52 /* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc. 53 * prumpf */ 54 55 #define STACK_TOP TASK_SIZE 56 #define STACK_TOP_MAX DEFAULT_TASK_SIZE 57 58 /* Allow bigger stacks for 64-bit processes */ 59 #define STACK_SIZE_MAX (USER_WIDE_MODE \ 60 ? (1 << 30) /* 1 GB */ \ 61 : (CONFIG_MAX_STACK_SIZE_MB*1024*1024)) 62 63 #endif 64 65 #ifndef __ASSEMBLY__ 66 67 /* 68 * Data detected about CPUs at boot time which is the same for all CPU's. 69 * HP boxes are SMP - ie identical processors. 70 * 71 * FIXME: some CPU rev info may be processor specific... 72 */ 73 struct system_cpuinfo_parisc { 74 unsigned int cpu_count; 75 unsigned int cpu_hz; 76 unsigned int hversion; 77 unsigned int sversion; 78 enum cpu_type cpu_type; 79 80 struct { 81 struct pdc_model model; 82 unsigned long versions; 83 unsigned long cpuid; 84 unsigned long capabilities; 85 char sys_model_name[81]; /* PDC-ROM returnes this model name */ 86 } pdc; 87 88 const char *cpu_name; /* e.g. "PA7300LC (PCX-L2)" */ 89 const char *family_name; /* e.g. "1.1e" */ 90 }; 91 92 93 /* Per CPU data structure - ie varies per CPU. */ 94 struct cpuinfo_parisc { 95 unsigned long it_value; /* Interval Timer at last timer Intr */ 96 unsigned long it_delta; /* Interval delta (tic_10ms / HZ * 100) */ 97 unsigned long irq_count; /* number of IRQ's since boot */ 98 unsigned long irq_max_cr16; /* longest time to handle a single IRQ */ 99 unsigned long cpuid; /* aka slot_number or set to NO_PROC_ID */ 100 unsigned long hpa; /* Host Physical address */ 101 unsigned long txn_addr; /* MMIO addr of EIR or id_eid */ 102 #ifdef CONFIG_SMP 103 unsigned long pending_ipi; /* bitmap of type ipi_message_type */ 104 #endif 105 unsigned long bh_count; /* number of times bh was invoked */ 106 unsigned long prof_counter; /* per CPU profiling support */ 107 unsigned long prof_multiplier; /* per CPU profiling support */ 108 unsigned long fp_rev; 109 unsigned long fp_model; 110 unsigned int state; 111 struct parisc_device *dev; 112 unsigned long loops_per_jiffy; 113 }; 114 115 extern struct system_cpuinfo_parisc boot_cpu_data; 116 DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data); 117 118 #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF) 119 120 typedef struct { 121 int seg; 122 } mm_segment_t; 123 124 #define ARCH_MIN_TASKALIGN 8 125 126 struct thread_struct { 127 struct pt_regs regs; 128 unsigned long task_size; 129 unsigned long map_base; 130 unsigned long flags; 131 }; 132 133 #define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs)) 134 135 /* Thread struct flags. */ 136 #define PARISC_UAC_NOPRINT (1UL << 0) /* see prctl and unaligned.c */ 137 #define PARISC_UAC_SIGBUS (1UL << 1) 138 #define PARISC_KERNEL_DEATH (1UL << 31) /* see die_if_kernel()... */ 139 140 #define PARISC_UAC_SHIFT 0 141 #define PARISC_UAC_MASK (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS) 142 143 #define SET_UNALIGN_CTL(task,value) \ 144 ({ \ 145 (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \ 146 | (((value) << PARISC_UAC_SHIFT) & \ 147 PARISC_UAC_MASK)); \ 148 0; \ 149 }) 150 151 #define GET_UNALIGN_CTL(task,addr) \ 152 ({ \ 153 put_user(((task)->thread.flags & PARISC_UAC_MASK) \ 154 >> PARISC_UAC_SHIFT, (int __user *) (addr)); \ 155 }) 156 157 #define INIT_THREAD { \ 158 .regs = { .gr = { 0, }, \ 159 .fr = { 0, }, \ 160 .sr = { 0, }, \ 161 .iasq = { 0, }, \ 162 .iaoq = { 0, }, \ 163 .cr27 = 0, \ 164 }, \ 165 .task_size = DEFAULT_TASK_SIZE, \ 166 .map_base = DEFAULT_MAP_BASE, \ 167 .flags = 0 \ 168 } 169 170 /* 171 * Return saved PC of a blocked thread. This is used by ps mostly. 172 */ 173 174 struct task_struct; 175 unsigned long thread_saved_pc(struct task_struct *t); 176 void show_trace(struct task_struct *task, unsigned long *stack); 177 178 /* 179 * Start user thread in another space. 180 * 181 * Note that we set both the iaoq and r31 to the new pc. When 182 * the kernel initially calls execve it will return through an 183 * rfi path that will use the values in the iaoq. The execve 184 * syscall path will return through the gateway page, and 185 * that uses r31 to branch to. 186 * 187 * For ELF we clear r23, because the dynamic linker uses it to pass 188 * the address of the finalizer function. 189 * 190 * We also initialize sr3 to an illegal value (illegal for our 191 * implementation, not for the architecture). 192 */ 193 typedef unsigned int elf_caddr_t; 194 195 #define start_thread_som(regs, new_pc, new_sp) do { \ 196 unsigned long *sp = (unsigned long *)new_sp; \ 197 __u32 spaceid = (__u32)current->mm->context; \ 198 unsigned long pc = (unsigned long)new_pc; \ 199 /* offset pc for priv. level */ \ 200 pc |= 3; \ 201 \ 202 regs->iasq[0] = spaceid; \ 203 regs->iasq[1] = spaceid; \ 204 regs->iaoq[0] = pc; \ 205 regs->iaoq[1] = pc + 4; \ 206 regs->sr[2] = LINUX_GATEWAY_SPACE; \ 207 regs->sr[3] = 0xffff; \ 208 regs->sr[4] = spaceid; \ 209 regs->sr[5] = spaceid; \ 210 regs->sr[6] = spaceid; \ 211 regs->sr[7] = spaceid; \ 212 regs->gr[ 0] = USER_PSW; \ 213 regs->gr[30] = ((new_sp)+63)&~63; \ 214 regs->gr[31] = pc; \ 215 \ 216 get_user(regs->gr[26],&sp[0]); \ 217 get_user(regs->gr[25],&sp[-1]); \ 218 get_user(regs->gr[24],&sp[-2]); \ 219 get_user(regs->gr[23],&sp[-3]); \ 220 } while(0) 221 222 /* The ELF abi wants things done a "wee bit" differently than 223 * som does. Supporting this behavior here avoids 224 * having our own version of create_elf_tables. 225 * 226 * Oh, and yes, that is not a typo, we are really passing argc in r25 227 * and argv in r24 (rather than r26 and r25). This is because that's 228 * where __libc_start_main wants them. 229 * 230 * Duplicated from dl-machine.h for the benefit of readers: 231 * 232 * Our initial stack layout is rather different from everyone else's 233 * due to the unique PA-RISC ABI. As far as I know it looks like 234 * this: 235 236 ----------------------------------- (user startup code creates this frame) 237 | 32 bytes of magic | 238 |---------------------------------| 239 | 32 bytes argument/sp save area | 240 |---------------------------------| (bprm->p) 241 | ELF auxiliary info | 242 | (up to 28 words) | 243 |---------------------------------| 244 | NULL | 245 |---------------------------------| 246 | Environment pointers | 247 |---------------------------------| 248 | NULL | 249 |---------------------------------| 250 | Argument pointers | 251 |---------------------------------| <- argv 252 | argc (1 word) | 253 |---------------------------------| <- bprm->exec (HACK!) 254 | N bytes of slack | 255 |---------------------------------| 256 | filename passed to execve | 257 |---------------------------------| (mm->env_end) 258 | env strings | 259 |---------------------------------| (mm->env_start, mm->arg_end) 260 | arg strings | 261 |---------------------------------| 262 | additional faked arg strings if | 263 | we're invoked via binfmt_script | 264 |---------------------------------| (mm->arg_start) 265 stack base is at TASK_SIZE - rlim_max. 266 267 on downward growing arches, it looks like this: 268 stack base at TASK_SIZE 269 | filename passed to execve 270 | env strings 271 | arg strings 272 | faked arg strings 273 | slack 274 | ELF 275 | envps 276 | argvs 277 | argc 278 279 * The pleasant part of this is that if we need to skip arguments we 280 * can just decrement argc and move argv, because the stack pointer 281 * is utterly unrelated to the location of the environment and 282 * argument vectors. 283 * 284 * Note that the S/390 people took the easy way out and hacked their 285 * GCC to make the stack grow downwards. 286 * 287 * Final Note: For entry from syscall, the W (wide) bit of the PSW 288 * is stuffed into the lowest bit of the user sp (%r30), so we fill 289 * it in here from the current->personality 290 */ 291 292 #ifdef CONFIG_64BIT 293 #define USER_WIDE_MODE (!test_thread_flag(TIF_32BIT)) 294 #else 295 #define USER_WIDE_MODE 0 296 #endif 297 298 #define start_thread(regs, new_pc, new_sp) do { \ 299 elf_addr_t *sp = (elf_addr_t *)new_sp; \ 300 __u32 spaceid = (__u32)current->mm->context; \ 301 elf_addr_t pc = (elf_addr_t)new_pc | 3; \ 302 elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1; \ 303 \ 304 regs->iasq[0] = spaceid; \ 305 regs->iasq[1] = spaceid; \ 306 regs->iaoq[0] = pc; \ 307 regs->iaoq[1] = pc + 4; \ 308 regs->sr[2] = LINUX_GATEWAY_SPACE; \ 309 regs->sr[3] = 0xffff; \ 310 regs->sr[4] = spaceid; \ 311 regs->sr[5] = spaceid; \ 312 regs->sr[6] = spaceid; \ 313 regs->sr[7] = spaceid; \ 314 regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \ 315 regs->fr[ 0] = 0LL; \ 316 regs->fr[ 1] = 0LL; \ 317 regs->fr[ 2] = 0LL; \ 318 regs->fr[ 3] = 0LL; \ 319 regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \ 320 regs->gr[31] = pc; \ 321 \ 322 get_user(regs->gr[25], (argv - 1)); \ 323 regs->gr[24] = (long) argv; \ 324 regs->gr[23] = 0; \ 325 } while(0) 326 327 struct task_struct; 328 struct mm_struct; 329 330 /* Free all resources held by a thread. */ 331 extern void release_thread(struct task_struct *); 332 333 extern unsigned long get_wchan(struct task_struct *p); 334 335 #define KSTK_EIP(tsk) ((tsk)->thread.regs.iaoq[0]) 336 #define KSTK_ESP(tsk) ((tsk)->thread.regs.gr[30]) 337 338 #define cpu_relax() barrier() 339 #define cpu_relax_lowlatency() cpu_relax() 340 341 /* Used as a macro to identify the combined VIPT/PIPT cached 342 * CPUs which require a guarantee of coherency (no inequivalent 343 * aliases with different data, whether clean or not) to operate */ 344 static inline int parisc_requires_coherency(void) 345 { 346 #ifdef CONFIG_PA8X00 347 return (boot_cpu_data.cpu_type == mako) || 348 (boot_cpu_data.cpu_type == mako2); 349 #else 350 return 0; 351 #endif 352 } 353 354 #endif /* __ASSEMBLY__ */ 355 356 #endif /* __ASM_PARISC_PROCESSOR_H */ 357