LXR linux/arch/parisc/include/asm/processor.h

   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 */
  70struct 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.  */
  91struct 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
 113extern struct system_cpuinfo_parisc boot_cpu_data;
 114DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
 115
 116#define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
 117
 118typedef struct {
 119        int seg;  
 120} mm_segment_t;
 121
 122#define ARCH_MIN_TASKALIGN      8
 123
 124struct 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
 172unsigned long thread_saved_pc(struct task_struct *t);
 173void 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 */
 190typedef 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
 265on 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
 326struct task_struct;
 327struct mm_struct;
 328
 329/* Free all resources held by a thread. */
 330extern void release_thread(struct task_struct *);
 331extern 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
 336extern void map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm);
 337
 338extern 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 */
 348static 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