arch/sparc/include/asm/thread_info_32.h

   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
  27 struct thread_info {
  28         unsigned long           uwinmask;
  29         struct task_struct      *task;          /* main task structure */
  30         struct exec_domain      *exec_domain;   /* execution domain */
  31         unsigned long           flags;          /* low level flags */
  32         int                     cpu;            /* cpu we're on */
  33         int                     preempt_count;  /* 0 => preemptable,
  34                                                    <0 => BUG */
  35         int                     softirq_count;
  36         int                     hardirq_count;
  37
  38         /* Context switch saved kernel state. */
  39         unsigned long ksp;      /* ... ksp __attribute__ ((aligned (8))); */
  40         unsigned long kpc;
  41         unsigned long kpsr;
  42         unsigned long kwim;
  43
  44         /* A place to store user windows and stack pointers
  45          * when the stack needs inspection.
  46          */
  47         struct reg_window32     reg_window[NSWINS];     /* align for ldd! */
  48         unsigned long           rwbuf_stkptrs[NSWINS];
  49         unsigned long           w_saved;
  50
  51         struct restart_block    restart_block;
  52 };
  53
  54 /*
  55  * macros/functions for gaining access to the thread information structure
  56  */
  57 #define INIT_THREAD_INFO(tsk)                           \
  58 {                                                       \
  59         .uwinmask       =       0,                      \
  60         .task           =       &tsk,                   \
  61         .exec_domain    =       &default_exec_domain,   \
  62         .flags          =       0,                      \
  63         .cpu            =       0,                      \
  64         .preempt_count  =       INIT_PREEMPT_COUNT,     \
  65         .restart_block  = {                             \
  66                 .fn     =       do_no_restart_syscall,  \
  67         },                                              \
  68 }
  69
  70 #define init_thread_info        (init_thread_union.thread_info)
  71 #define init_stack              (init_thread_union.stack)
  72
  73 /* how to get the thread information struct from C */
  74 register struct thread_info *current_thread_info_reg asm("g6");
  75 #define current_thread_info()   (current_thread_info_reg)
  76
  77 /*
  78  * thread information allocation
  79  */
  80 #define THREAD_INFO_ORDER  1
  81
  82 struct thread_info * alloc_thread_info_node(struct task_struct *tsk, int node);
  83 void free_thread_info(struct thread_info *);
  84
  85 #endif /* __ASSEMBLY__ */
  86
  87 /*
  88  * Size of kernel stack for each process.
  89  * Observe the order of get_free_pages() in alloc_thread_info_node().
  90  * The sun4 has 8K stack too, because it's short on memory, and 16K is a waste.
  91  */
  92 #define THREAD_SIZE             (2 * PAGE_SIZE)
  93
  94 /*
  95  * Offsets in thread_info structure, used in assembly code
  96  * The "#define REGWIN_SZ 0x40" was abolished, so no multiplications.
  97  */
  98 #define TI_UWINMASK     0x00    /* uwinmask */
  99 #define TI_TASK         0x04
 100 #define TI_EXECDOMAIN   0x08    /* exec_domain */
 101 #define TI_FLAGS        0x0c
 102 #define TI_CPU          0x10
 103 #define TI_PREEMPT      0x14    /* preempt_count */
 104 #define TI_SOFTIRQ      0x18    /* softirq_count */
 105 #define TI_HARDIRQ      0x1c    /* hardirq_count */
 106 #define TI_KSP          0x20    /* ksp */
 107 #define TI_KPC          0x24    /* kpc (ldd'ed with kpc) */
 108 #define TI_KPSR         0x28    /* kpsr */
 109 #define TI_KWIM         0x2c    /* kwim (ldd'ed with kpsr) */
 110 #define TI_REG_WINDOW   0x30
 111 #define TI_RWIN_SPTRS   0x230
 112 #define TI_W_SAVED      0x250
 113 /* #define TI_RESTART_BLOCK 0x25n */ /* Nobody cares */
 114
 115 #define PREEMPT_ACTIVE          0x4000000
 116
 117 /*
 118  * thread information flag bit numbers
 119  */
 120 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 121 #define TIF_NOTIFY_RESUME       1       /* callback before returning to user */
 122 #define TIF_SIGPENDING          2       /* signal pending */
 123 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
 124 #define TIF_RESTORE_SIGMASK     4       /* restore signal mask in do_signal() */
 125 #define TIF_USEDFPU             8       /* FPU was used by this task
 126                                          * this quantum (SMP) */
 127 #define TIF_POLLING_NRFLAG      9       /* true if poll_idle() is polling
 128                                          * TIF_NEED_RESCHED */
 129 #define TIF_MEMDIE              10      /* is terminating due to OOM killer */
 130
 131 /* as above, but as bit values */
 132 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 133 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 134 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 135 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 136 #define _TIF_RESTORE_SIGMASK    (1<<TIF_RESTORE_SIGMASK)
 137 #define _TIF_USEDFPU            (1<<TIF_USEDFPU)
 138 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 139
 140 #define _TIF_DO_NOTIFY_RESUME_MASK      (_TIF_NOTIFY_RESUME | \
 141                                          _TIF_SIGPENDING | \
 142                                          _TIF_RESTORE_SIGMASK)
 143
 144 #endif /* __KERNEL__ */
 145
 146 #endif /* _ASM_THREAD_INFO_H */