LXR linux/arch/sparc/include/asm/thread_info

   1/*
   2 * thread_info.h: sparc low-level thread information
   3 * adapted from the ppc version by Pete Zaitcev, which was
   4 * adapted from the i386 version by Paul Mackerras
   5 *
   6 * Copyright (C) 2002  David Howells (dhowells@redhat.com)
   7 * Copyright (c) 2002  Pete Zaitcev (zaitcev@yahoo.com)
   8 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
   9 */
  10
  11#ifndef _ASM_THREAD_INFO_H
  12#define _ASM_THREAD_INFO_H
  13
  14#ifdef __KERNEL__
  15
  16#ifndef __ASSEMBLY__
  17
  18#include <asm/ptrace.h>
  19#include <asm/page.h>
  20
  21/*
  22 * Low level task data.
  23 *
  24 * If you change this, change the TI_* offsets below to match.
  25 */
  26#define NSWINS 8
  27struct thread_info {
  28        unsigned long           uwinmask;
  29        struct task_struct      *task;          /* main task structure */
  30        unsigned long           flags;          /* low level flags */
  31        int                     cpu;            /* cpu we're on */
  32        int                     preempt_count;  /* 0 => preemptable,
  33                                                   <0 => BUG */
  34        int                     softirq_count;
  35        int                     hardirq_count;
  36
  37        u32 __unused;
  38
  39        /* Context switch saved kernel state. */
  40        unsigned long ksp;      /* ... ksp __attribute__ ((aligned (8))); */
  41        unsigned long kpc;
  42        unsigned long kpsr;
  43        unsigned long kwim;
  44
  45        /* A place to store user windows and stack pointers
  46         * when the stack needs inspection.
  47         */
  48        struct reg_window32     reg_window[NSWINS];     /* align for ldd! */
  49        unsigned long           rwbuf_stkptrs[NSWINS];
  50        unsigned long           w_saved;
  51};
  52
  53/*
  54 * macros/functions for gaining access to the thread information structure
  55 */
  56#define INIT_THREAD_INFO(tsk)                           \
  57{                                                       \
  58        .uwinmask       =       0,                      \
  59        .task           =       &tsk,                   \
  60        .flags          =       0,                      \
  61        .cpu            =       0,                      \
  62        .preempt_count  =       INIT_PREEMPT_COUNT,     \
  63}
  64
  65#define init_thread_info        (init_thread_union.thread_info)
  66#define init_stack              (init_thread_union.stack)
  67
  68/* how to get the thread information struct from C */
  69register struct thread_info *current_thread_info_reg asm("g6");
  70#define current_thread_info()   (current_thread_info_reg)
  71
  72/*
  73 * thread information allocation
  74 */
  75#define THREAD_SIZE_ORDER  1
  76
  77#endif /* __ASSEMBLY__ */
  78
  79/* Size of kernel stack for each process */
  80#define THREAD_SIZE             (2 * PAGE_SIZE)
  81
  82/*
  83 * Offsets in thread_info structure, used in assembly code
  84 * The "#define REGWIN_SZ 0x40" was abolished, so no multiplications.
  85 */
  86#define TI_UWINMASK     0x00    /* uwinmask */
  87#define TI_TASK         0x04
  88#define TI_FLAGS        0x08
  89#define TI_CPU          0x0c
  90#define TI_PREEMPT      0x10    /* preempt_count */
  91#define TI_SOFTIRQ      0x14    /* softirq_count */
  92#define TI_HARDIRQ      0x18    /* hardirq_count */
  93#define TI_KSP          0x20    /* ksp */
  94#define TI_KPC          0x24    /* kpc (ldd'ed with kpc) */
  95#define TI_KPSR         0x28    /* kpsr */
  96#define TI_KWIM         0x2c    /* kwim (ldd'ed with kpsr) */
  97#define TI_REG_WINDOW   0x30
  98#define TI_RWIN_SPTRS   0x230
  99#define TI_W_SAVED      0x250
 100
 101/*
 102 * thread information flag bit numbers
 103 */
 104#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 105#define TIF_NOTIFY_RESUME       1       /* callback before returning to user */
 106#define TIF_SIGPENDING          2       /* signal pending */
 107#define TIF_NEED_RESCHED        3       /* rescheduling necessary */
 108#define TIF_RESTORE_SIGMASK     4       /* restore signal mask in do_signal() */
 109#define TIF_USEDFPU             8       /* FPU was used by this task
 110                                         * this quantum (SMP) */
 111#define TIF_POLLING_NRFLAG      9       /* true if poll_idle() is polling
 112                                         * TIF_NEED_RESCHED */
 113#define TIF_MEMDIE              10      /* is terminating due to OOM killer */
 114
 115/* as above, but as bit values */
 116#define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 117#define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 118#define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 119#define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 120#define _TIF_USEDFPU            (1<<TIF_USEDFPU)
 121#define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 122
 123#define _TIF_DO_NOTIFY_RESUME_MASK      (_TIF_NOTIFY_RESUME | \
 124                                         _TIF_SIGPENDING)
 125
 126#define is_32bit_task() (1)
 127
 128#endif /* __KERNEL__ */
 129
 130#endif /* _ASM_THREAD_INFO_H */
 131