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/system.h> 20 #include <asm/percpu.h> 21 22 #endif /* __ASSEMBLY__ */ 23 24 #define KERNEL_STACK_SIZE (4*PAGE_SIZE) 25 26 /* 27 * Default implementation of macro that returns current 28 * instruction pointer ("program counter"). 29 */ 30 #ifdef CONFIG_PA20 31 #define current_ia(x) __asm__("mfia %0" : "=r"(x)) 32 #else /* mfia added in pa2.0 */ 33 #define current_ia(x) __asm__("blr 0,%0\n\tnop" : "=r"(x)) 34 #endif 35 #define current_text_addr() ({ void *pc; current_ia(pc); pc; }) 36 37 #define TASK_SIZE_OF(tsk) ((tsk)->thread.task_size) 38 #define TASK_SIZE TASK_SIZE_OF(current) 39 #define TASK_UNMAPPED_BASE (current->thread.map_base) 40 41 #define DEFAULT_TASK_SIZE32 (0xFFF00000UL) 42 #define DEFAULT_MAP_BASE32 (0x40000000UL) 43 44 #ifdef CONFIG_64BIT 45 #define DEFAULT_TASK_SIZE (MAX_ADDRESS-0xf000000) 46 #define DEFAULT_MAP_BASE (0x200000000UL) 47 #else 48 #define DEFAULT_TASK_SIZE DEFAULT_TASK_SIZE32 49 #define DEFAULT_MAP_BASE DEFAULT_MAP_BASE32 50 #endif 51 52 #ifdef __KERNEL__ 53 54 /* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc. 55 * prumpf */ 56 57 #define STACK_TOP TASK_SIZE 58 #define STACK_TOP_MAX DEFAULT_TASK_SIZE 59 60 #endif 61 62 #ifndef __ASSEMBLY__ 63 64 /* 65 * Data detected about CPUs at boot time which is the same for all CPU's. 66 * HP boxes are SMP - ie identical processors. 67 * 68 * FIXME: some CPU rev info may be processor specific... 69 */ 70 struct system_cpuinfo_parisc { 71 unsigned int cpu_count; 72 unsigned int cpu_hz; 73 unsigned int hversion; 74 unsigned int sversion; 75 enum cpu_type cpu_type; 76 77 struct { 78 struct pdc_model model; 79 unsigned long versions; 80 unsigned long cpuid; 81 unsigned long capabilities; 82 char sys_model_name[81]; /* PDC-ROM returnes this model name */ 83 } pdc; 84 85 const char *cpu_name; /* e.g. "PA7300LC (PCX-L2)" */ 86 const char *family_name; /* e.g. "1.1e" */ 87 }; 88 89 90 /* Per CPU data structure - ie varies per CPU. */ 91 struct cpuinfo_parisc { 92 unsigned long it_value; /* Interval Timer at last timer Intr */ 93 unsigned long it_delta; /* Interval delta (tic_10ms / HZ * 100) */ 94 unsigned long irq_count; /* number of IRQ's since boot */ 95 unsigned long irq_max_cr16; /* longest time to handle a single IRQ */ 96 unsigned long cpuid; /* aka slot_number or set to NO_PROC_ID */ 97 unsigned long hpa; /* Host Physical address */ 98 unsigned long txn_addr; /* MMIO addr of EIR or id_eid */ 99 #ifdef CONFIG_SMP 100 unsigned long pending_ipi; /* bitmap of type ipi_message_type */ 101 unsigned long ipi_count; /* number ipi Interrupts */ 102 #endif 103 unsigned long bh_count; /* number of times bh was invoked */ 104 unsigned long prof_counter; /* per CPU profiling support */ 105 unsigned long prof_multiplier; /* per CPU profiling support */ 106 unsigned long fp_rev; 107 unsigned long fp_model; 108 unsigned int state; 109 struct parisc_device *dev; 110 unsigned long loops_per_jiffy; 111 }; 112 113 extern struct system_cpuinfo_parisc boot_cpu_data; 114 DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data); 115 116 #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF) 117 118 typedef struct { 119 int seg; 120 } mm_segment_t; 121 122 #define ARCH_MIN_TASKALIGN 8 123 124 struct thread_struct { 125 struct pt_regs regs; 126 unsigned long task_size; 127 unsigned long map_base; 128 unsigned long flags; 129 }; 130 131 #define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs)) 132 133 /* Thread struct flags. */ 134 #define PARISC_UAC_NOPRINT (1UL << 0) /* see prctl and unaligned.c */ 135 #define PARISC_UAC_SIGBUS (1UL << 1) 136 #define PARISC_KERNEL_DEATH (1UL << 31) /* see die_if_kernel()... */ 137 138 #define PARISC_UAC_SHIFT 0 139 #define PARISC_UAC_MASK (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS) 140 141 #define SET_UNALIGN_CTL(task,value) \ 142 ({ \ 143 (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \ 144 | (((value) << PARISC_UAC_SHIFT) & \ 145 PARISC_UAC_MASK)); \ 146 0; \ 147 }) 148 149 #define GET_UNALIGN_CTL(task,addr) \ 150 ({ \ 151 put_user(((task)->thread.flags & PARISC_UAC_MASK) \ 152 >> PARISC_UAC_SHIFT, (int __user *) (addr)); \ 153 }) 154 155 #define INIT_THREAD { \ 156 .regs = { .gr = { 0, }, \ 157 .fr = { 0, }, \ 158 .sr = { 0, }, \ 159 .iasq = { 0, }, \ 160 .iaoq = { 0, }, \ 161 .cr27 = 0, \ 162 }, \ 163 .task_size = DEFAULT_TASK_SIZE, \ 164 .map_base = DEFAULT_MAP_BASE, \ 165 .flags = 0 \ 166 } 167 168 /* 169 * Return saved PC of a blocked thread. This is used by ps mostly. 170 */ 171 172 unsigned long thread_saved_pc(struct task_struct *t); 173 void show_trace(struct task_struct *task, unsigned long *stack); 174 175 /* 176 * Start user thread in another space. 177 * 178 * Note that we set both the iaoq and r31 to the new pc. When 179 * the kernel initially calls execve it will return through an 180 * rfi path that will use the values in the iaoq. The execve 181 * syscall path will return through the gateway page, and 182 * that uses r31 to branch to. 183 * 184 * For ELF we clear r23, because the dynamic linker uses it to pass 185 * the address of the finalizer function. 186 * 187 * We also initialize sr3 to an illegal value (illegal for our 188 * implementation, not for the architecture). 189 */ 190 typedef unsigned int elf_caddr_t; 191 192 #define start_thread_som(regs, new_pc, new_sp) do { \ 193 unsigned long *sp = (unsigned long *)new_sp; \ 194 __u32 spaceid = (__u32)current->mm->context; \ 195 unsigned long pc = (unsigned long)new_pc; \ 196 /* offset pc for priv. level */ \ 197 pc |= 3; \ 198 \ 199 set_fs(USER_DS); \ 200 regs->iasq[0] = spaceid; \ 201 regs->iasq[1] = spaceid; \ 202 regs->iaoq[0] = pc; \ 203 regs->iaoq[1] = pc + 4; \ 204 regs->sr[2] = LINUX_GATEWAY_SPACE; \ 205 regs->sr[3] = 0xffff; \ 206 regs->sr[4] = spaceid; \ 207 regs->sr[5] = spaceid; \ 208 regs->sr[6] = spaceid; \ 209 regs->sr[7] = spaceid; \ 210 regs->gr[ 0] = USER_PSW; \ 211 regs->gr[30] = ((new_sp)+63)&~63; \ 212 regs->gr[31] = pc; \ 213 \ 214 get_user(regs->gr[26],&sp[0]); \ 215 get_user(regs->gr[25],&sp[-1]); \ 216 get_user(regs->gr[24],&sp[-2]); \ 217 get_user(regs->gr[23],&sp[-3]); \ 218 } while(0) 219 220 /* The ELF abi wants things done a "wee bit" differently than 221 * som does. Supporting this behavior here avoids 222 * having our own version of create_elf_tables. 223 * 224 * Oh, and yes, that is not a typo, we are really passing argc in r25 225 * and argv in r24 (rather than r26 and r25). This is because that's 226 * where __libc_start_main wants them. 227 * 228 * Duplicated from dl-machine.h for the benefit of readers: 229 * 230 * Our initial stack layout is rather different from everyone else's 231 * due to the unique PA-RISC ABI. As far as I know it looks like 232 * this: 233 234 ----------------------------------- (user startup code creates this frame) 235 | 32 bytes of magic | 236 |---------------------------------| 237 | 32 bytes argument/sp save area | 238 |---------------------------------| (bprm->p) 239 | ELF auxiliary info | 240 | (up to 28 words) | 241 |---------------------------------| 242 | NULL | 243 |---------------------------------| 244 | Environment pointers | 245 |---------------------------------| 246 | NULL | 247 |---------------------------------| 248 | Argument pointers | 249 |---------------------------------| <- argv 250 | argc (1 word) | 251 |---------------------------------| <- bprm->exec (HACK!) 252 | N bytes of slack | 253 |---------------------------------| 254 | filename passed to execve | 255 |---------------------------------| (mm->env_end) 256 | env strings | 257 |---------------------------------| (mm->env_start, mm->arg_end) 258 | arg strings | 259 |---------------------------------| 260 | additional faked arg strings if | 261 | we're invoked via binfmt_script | 262 |---------------------------------| (mm->arg_start) 263 stack base is at TASK_SIZE - rlim_max. 264 265 on downward growing arches, it looks like this: 266 stack base at TASK_SIZE 267 | filename passed to execve 268 | env strings 269 | arg strings 270 | faked arg strings 271 | slack 272 | ELF 273 | envps 274 | argvs 275 | argc 276 277 * The pleasant part of this is that if we need to skip arguments we 278 * can just decrement argc and move argv, because the stack pointer 279 * is utterly unrelated to the location of the environment and 280 * argument vectors. 281 * 282 * Note that the S/390 people took the easy way out and hacked their 283 * GCC to make the stack grow downwards. 284 * 285 * Final Note: For entry from syscall, the W (wide) bit of the PSW 286 * is stuffed into the lowest bit of the user sp (%r30), so we fill 287 * it in here from the current->personality 288 */ 289 290 #ifdef CONFIG_64BIT 291 #define USER_WIDE_MODE (!test_thread_flag(TIF_32BIT)) 292 #else 293 #define USER_WIDE_MODE 0 294 #endif 295 296 #define start_thread(regs, new_pc, new_sp) do { \ 297 elf_addr_t *sp = (elf_addr_t *)new_sp; \ 298 __u32 spaceid = (__u32)current->mm->context; \ 299 elf_addr_t pc = (elf_addr_t)new_pc | 3; \ 300 elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1; \ 301 \ 302 set_fs(USER_DS); \ 303 regs->iasq[0] = spaceid; \ 304 regs->iasq[1] = spaceid; \ 305 regs->iaoq[0] = pc; \ 306 regs->iaoq[1] = pc + 4; \ 307 regs->sr[2] = LINUX_GATEWAY_SPACE; \ 308 regs->sr[3] = 0xffff; \ 309 regs->sr[4] = spaceid; \ 310 regs->sr[5] = spaceid; \ 311 regs->sr[6] = spaceid; \ 312 regs->sr[7] = spaceid; \ 313 regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \ 314 regs->fr[ 0] = 0LL; \ 315 regs->fr[ 1] = 0LL; \ 316 regs->fr[ 2] = 0LL; \ 317 regs->fr[ 3] = 0LL; \ 318 regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \ 319 regs->gr[31] = pc; \ 320 \ 321 get_user(regs->gr[25], (argv - 1)); \ 322 regs->gr[24] = (long) argv; \ 323 regs->gr[23] = 0; \ 324 } while(0) 325 326 struct task_struct; 327 struct mm_struct; 328 329 /* Free all resources held by a thread. */ 330 extern void release_thread(struct task_struct *); 331 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); 332 333 /* Prepare to copy thread state - unlazy all lazy status */ 334 #define prepare_to_copy(tsk) do { } while (0) 335 336 extern void map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm); 337 338 extern unsigned long get_wchan(struct task_struct *p); 339 340 #define KSTK_EIP(tsk) ((tsk)->thread.regs.iaoq[0]) 341 #define KSTK_ESP(tsk) ((tsk)->thread.regs.gr[30]) 342 343 #define cpu_relax() barrier() 344 345 /* Used as a macro to identify the combined VIPT/PIPT cached 346 * CPUs which require a guarantee of coherency (no inequivalent 347 * aliases with different data, whether clean or not) to operate */ 348 static inline int parisc_requires_coherency(void) 349 { 350 #ifdef CONFIG_PA8X00 351 return (boot_cpu_data.cpu_type == mako) || 352 (boot_cpu_data.cpu_type == mako2); 353 #else 354 return 0; 355 #endif 356 } 357 358 #endif /* __ASSEMBLY__ */ 359 360 #endif /* __ASM_PARISC_PROCESSOR_H */ 361