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/btfixup.h>
  19 #include <asm/ptrace.h>
  20 #include <asm/page.h>
  21
  22 /*
  23  * Low level task data.
  24  *
  25  * If you change this, change the TI_* offsets below to match.
  26  */
  27 #define NSWINS 8
  28 struct thread_info {
  29         unsigned long           uwinmask;
  30         struct task_struct      *task;          /* main task structure */
  31         struct exec_domain      *exec_domain;   /* execution domain */
  32         unsigned long           flags;          /* low level flags */
  33         int                     cpu;            /* cpu we're on */
  34         int                     preempt_count;  /* 0 => preemptable,
  35                                                    <0 => BUG */
  36         int                     softirq_count;
  37         int                     hardirq_count;
  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         struct restart_block    restart_block;
  53 };
  54
  55 /*
  56  * macros/functions for gaining access to the thread information structure
  57  */
  58 #define INIT_THREAD_INFO(tsk)                           \
  59 {                                                       \
  60         .uwinmask       =       0,                      \
  61         .task           =       &tsk,                   \
  62         .exec_domain    =       &default_exec_domain,   \
  63         .flags          =       0,                      \
  64         .cpu            =       0,                      \
  65         .preempt_count  =       INIT_PREEMPT_COUNT,     \
  66         .restart_block  = {                             \
  67                 .fn     =       do_no_restart_syscall,  \
  68         },                                              \
  69 }
  70
  71 #define init_thread_info        (init_thread_union.thread_info)
  72 #define init_stack              (init_thread_union.stack)
  73
  74 /* how to get the thread information struct from C */
  75 register struct thread_info *current_thread_info_reg asm("g6");
  76 #define current_thread_info()   (current_thread_info_reg)
  77
  78 /*
  79  * thread information allocation
  80  */
  81 #define THREAD_INFO_ORDER  1
  82
  83 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
  84
  85 BTFIXUPDEF_CALL(struct thread_info *, alloc_thread_info_node, int)
  86 #define alloc_thread_info_node(tsk, node) BTFIXUP_CALL(alloc_thread_info_node)(node)
  87
  88 BTFIXUPDEF_CALL(void, free_thread_info, struct thread_info *)
  89 #define free_thread_info(ti) BTFIXUP_CALL(free_thread_info)(ti)
  90
  91 #endif /* __ASSEMBLY__ */
  92
  93 /*
  94  * Size of kernel stack for each process.
  95  * Observe the order of get_free_pages() in alloc_thread_info_node().
  96  * The sun4 has 8K stack too, because it's short on memory, and 16K is a waste.
  97  */
  98 #define THREAD_SIZE             (2 * PAGE_SIZE)
  99
 100 /*
 101  * Offsets in thread_info structure, used in assembly code
 102  * The "#define REGWIN_SZ 0x40" was abolished, so no multiplications.
 103  */
 104 #define TI_UWINMASK     0x00    /* uwinmask */
 105 #define TI_TASK         0x04
 106 #define TI_EXECDOMAIN   0x08    /* exec_domain */
 107 #define TI_FLAGS        0x0c
 108 #define TI_CPU          0x10
 109 #define TI_PREEMPT      0x14    /* preempt_count */
 110 #define TI_SOFTIRQ      0x18    /* softirq_count */
 111 #define TI_HARDIRQ      0x1c    /* hardirq_count */
 112 #define TI_KSP          0x20    /* ksp */
 113 #define TI_KPC          0x24    /* kpc (ldd'ed with kpc) */
 114 #define TI_KPSR         0x28    /* kpsr */
 115 #define TI_KWIM         0x2c    /* kwim (ldd'ed with kpsr) */
 116 #define TI_REG_WINDOW   0x30
 117 #define TI_RWIN_SPTRS   0x230
 118 #define TI_W_SAVED      0x250
 119 /* #define TI_RESTART_BLOCK 0x25n */ /* Nobody cares */
 120
 121 #define PREEMPT_ACTIVE          0x4000000
 122
 123 /*
 124  * thread information flag bit numbers
 125  */
 126 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 127 #define TIF_NOTIFY_RESUME       1       /* callback before returning to user */
 128 #define TIF_SIGPENDING          2       /* signal pending */
 129 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
 130 #define TIF_RESTORE_SIGMASK     4       /* restore signal mask in do_signal() */
 131 #define TIF_USEDFPU             8       /* FPU was used by this task
 132                                          * this quantum (SMP) */
 133 #define TIF_POLLING_NRFLAG      9       /* true if poll_idle() is polling
 134                                          * TIF_NEED_RESCHED */
 135 #define TIF_MEMDIE              10      /* is terminating due to OOM killer */
 136
 137 /* as above, but as bit values */
 138 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 139 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 140 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 141 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 142 #define _TIF_RESTORE_SIGMASK    (1<<TIF_RESTORE_SIGMASK)
 143 #define _TIF_USEDFPU            (1<<TIF_USEDFPU)
 144 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 145
 146 #define _TIF_DO_NOTIFY_RESUME_MASK      (_TIF_NOTIFY_RESUME | \
 147                                          _TIF_SIGPENDING | \
 148                                          _TIF_RESTORE_SIGMASK)
 149
 150 #endif /* __KERNEL__ */
 151
 152 #endif /* _ASM_THREAD_INFO_H */