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