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/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 */
  73struct 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.  */
  94struct 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
 115extern struct system_cpuinfo_parisc boot_cpu_data;
 116DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
 117
 118#define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
 119
 120typedef struct {
 121        int seg;  
 122} mm_segment_t;
 123
 124#define ARCH_MIN_TASKALIGN      8
 125
 126struct 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
 174struct task_struct;
 175unsigned long thread_saved_pc(struct task_struct *t);
 176void 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 */
 193typedef unsigned int elf_caddr_t;
 194
 195/* The ELF abi wants things done a "wee bit" differently than
 196 * som does.  Supporting this behavior here avoids
 197 * having our own version of create_elf_tables.
 198 *
 199 * Oh, and yes, that is not a typo, we are really passing argc in r25
 200 * and argv in r24 (rather than r26 and r25).  This is because that's
 201 * where __libc_start_main wants them.
 202 *
 203 * Duplicated from dl-machine.h for the benefit of readers:
 204 *
 205 *  Our initial stack layout is rather different from everyone else's
 206 *  due to the unique PA-RISC ABI.  As far as I know it looks like
 207 *  this:
 208
 209   -----------------------------------  (user startup code creates this frame)
 210   |         32 bytes of magic       |
 211   |---------------------------------|
 212   | 32 bytes argument/sp save area  |
 213   |---------------------------------| (bprm->p)
 214   |        ELF auxiliary info       |
 215   |         (up to 28 words)        |
 216   |---------------------------------|
 217   |               NULL              |
 218   |---------------------------------|
 219   |       Environment pointers      |
 220   |---------------------------------|
 221   |               NULL              |
 222   |---------------------------------|
 223   |        Argument pointers        |
 224   |---------------------------------| <- argv
 225   |          argc (1 word)          |
 226   |---------------------------------| <- bprm->exec (HACK!)
 227   |         N bytes of slack        |
 228   |---------------------------------|
 229   |    filename passed to execve    |
 230   |---------------------------------| (mm->env_end)
 231   |           env strings           |
 232   |---------------------------------| (mm->env_start, mm->arg_end)
 233   |           arg strings           |
 234   |---------------------------------|
 235   | additional faked arg strings if |
 236   | we're invoked via binfmt_script |
 237   |---------------------------------| (mm->arg_start)
 238   stack base is at TASK_SIZE - rlim_max.
 239
 240on downward growing arches, it looks like this:
 241   stack base at TASK_SIZE
 242   | filename passed to execve
 243   | env strings
 244   | arg strings
 245   | faked arg strings
 246   | slack
 247   | ELF
 248   | envps
 249   | argvs
 250   | argc
 251
 252 *  The pleasant part of this is that if we need to skip arguments we
 253 *  can just decrement argc and move argv, because the stack pointer
 254 *  is utterly unrelated to the location of the environment and
 255 *  argument vectors.
 256 *
 257 * Note that the S/390 people took the easy way out and hacked their
 258 * GCC to make the stack grow downwards.
 259 *
 260 * Final Note: For entry from syscall, the W (wide) bit of the PSW
 261 * is stuffed into the lowest bit of the user sp (%r30), so we fill
 262 * it in here from the current->personality
 263 */
 264
 265#ifdef CONFIG_64BIT
 266#define USER_WIDE_MODE  (!test_thread_flag(TIF_32BIT))
 267#else
 268#define USER_WIDE_MODE  0
 269#endif
 270
 271#define start_thread(regs, new_pc, new_sp) do {         \
 272        elf_addr_t *sp = (elf_addr_t *)new_sp;          \
 273        __u32 spaceid = (__u32)current->mm->context;    \
 274        elf_addr_t pc = (elf_addr_t)new_pc | 3;         \
 275        elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1;      \
 276                                                        \
 277        regs->iasq[0] = spaceid;                        \
 278        regs->iasq[1] = spaceid;                        \
 279        regs->iaoq[0] = pc;                             \
 280        regs->iaoq[1] = pc + 4;                         \
 281        regs->sr[2] = LINUX_GATEWAY_SPACE;              \
 282        regs->sr[3] = 0xffff;                           \
 283        regs->sr[4] = spaceid;                          \
 284        regs->sr[5] = spaceid;                          \
 285        regs->sr[6] = spaceid;                          \
 286        regs->sr[7] = spaceid;                          \
 287        regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
 288        regs->fr[ 0] = 0LL;                             \
 289        regs->fr[ 1] = 0LL;                             \
 290        regs->fr[ 2] = 0LL;                             \
 291        regs->fr[ 3] = 0LL;                             \
 292        regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
 293        regs->gr[31] = pc;                              \
 294                                                        \
 295        get_user(regs->gr[25], (argv - 1));             \
 296        regs->gr[24] = (long) argv;                     \
 297        regs->gr[23] = 0;                               \
 298} while(0)
 299
 300struct task_struct;
 301struct mm_struct;
 302
 303/* Free all resources held by a thread. */
 304extern void release_thread(struct task_struct *);
 305
 306extern unsigned long get_wchan(struct task_struct *p);
 307
 308#define KSTK_EIP(tsk)   ((tsk)->thread.regs.iaoq[0])
 309#define KSTK_ESP(tsk)   ((tsk)->thread.regs.gr[30])
 310
 311#define cpu_relax()     barrier()
 312#define cpu_relax_lowlatency() cpu_relax()
 313
 314/*
 315 * parisc_requires_coherency() is used to identify the combined VIPT/PIPT
 316 * cached CPUs which require a guarantee of coherency (no inequivalent aliases
 317 * with different data, whether clean or not) to operate
 318 */
 319#ifdef CONFIG_PA8X00
 320extern int _parisc_requires_coherency;
 321#define parisc_requires_coherency()     _parisc_requires_coherency
 322#else
 323#define parisc_requires_coherency()     (0)
 324#endif
 325
 326#endif /* __ASSEMBLY__ */
 327
 328#endif /* __ASM_PARISC_PROCESSOR_H */
 329