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