include/asm-sparc/thread_info.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_window       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  * preempt_count needs to be 1 initially, until the scheduler is functional.
  59  */
  60 #define INIT_THREAD_INFO(tsk)                           \
  61 {                                                       \
  62         .uwinmask       =       0,                      \
  63         .task           =       &tsk,                   \
  64         .exec_domain    =       &default_exec_domain,   \
  65         .flags          =       0,                      \
  66         .cpu            =       0,                      \
  67         .preempt_count  =       1,                      \
  68         .restart_block  = {                             \
  69                 .fn     =       do_no_restart_syscall,  \
  70         },                                              \
  71 }
  72
  73 #define init_thread_info        (init_thread_union.thread_info)
  74 #define init_stack              (init_thread_union.stack)
  75
  76 /* how to get the thread information struct from C */
  77 register struct thread_info *current_thread_info_reg asm("g6");
  78 #define current_thread_info()   (current_thread_info_reg)
  79
  80 /*
  81  * thread information allocation
  82  */
  83 #if PAGE_SHIFT == 13
  84 #define THREAD_INFO_ORDER  0
  85 #else /* PAGE_SHIFT */
  86 #define THREAD_INFO_ORDER  1
  87 #endif
  88
  89 BTFIXUPDEF_CALL(struct thread_info *, alloc_thread_info, void)
  90 #define alloc_thread_info(tsk) BTFIXUP_CALL(alloc_thread_info)()
  91
  92 BTFIXUPDEF_CALL(void, free_thread_info, struct thread_info *)
  93 #define free_thread_info(ti) BTFIXUP_CALL(free_thread_info)(ti)
  94
  95 #endif /* __ASSEMBLY__ */
  96
  97 /*
  98  * Size of kernel stack for each process.
  99  * Observe the order of get_free_pages() in alloc_thread_info().
 100  * The sun4 has 8K stack too, because it's short on memory, and 16K is a waste.
 101  */
 102 #define THREAD_SIZE             8192
 103
 104 /*
 105  * Offsets in thread_info structure, used in assembly code
 106  * The "#define REGWIN_SZ 0x40" was abolished, so no multiplications.
 107  */
 108 #define TI_UWINMASK     0x00    /* uwinmask */
 109 #define TI_TASK         0x04
 110 #define TI_EXECDOMAIN   0x08    /* exec_domain */
 111 #define TI_FLAGS        0x0c
 112 #define TI_CPU          0x10
 113 #define TI_PREEMPT      0x14    /* preempt_count */
 114 #define TI_SOFTIRQ      0x18    /* softirq_count */
 115 #define TI_HARDIRQ      0x1c    /* hardirq_count */
 116 #define TI_KSP          0x20    /* ksp */
 117 #define TI_KPC          0x24    /* kpc (ldd'ed with kpc) */
 118 #define TI_KPSR         0x28    /* kpsr */
 119 #define TI_KWIM         0x2c    /* kwim (ldd'ed with kpsr) */
 120 #define TI_REG_WINDOW   0x30
 121 #define TI_RWIN_SPTRS   0x230
 122 #define TI_W_SAVED      0x250
 123 /* #define TI_RESTART_BLOCK 0x25n */ /* Nobody cares */
 124
 125 #define PREEMPT_ACTIVE          0x4000000
 126
 127 /*
 128  * thread information flag bit numbers
 129  */
 130 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 131 /* flag bit 1 is available */
 132 #define TIF_SIGPENDING          2       /* signal pending */
 133 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
 134 #define TIF_RESTORE_SIGMASK     4       /* restore signal mask in do_signal() */
 135 #define TIF_USEDFPU             8       /* FPU was used by this task
 136                                          * this quantum (SMP) */
 137 #define TIF_POLLING_NRFLAG      9       /* true if poll_idle() is polling
 138                                          * TIF_NEED_RESCHED */
 139 #define TIF_MEMDIE              10
 140
 141 /* as above, but as bit values */
 142 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 143 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 144 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 145 #define _TIF_RESTORE_SIGMASK    (1<<TIF_RESTORE_SIGMASK)
 146 #define _TIF_USEDFPU            (1<<TIF_USEDFPU)
 147 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 148
 149 #endif /* __KERNEL__ */
 150
 151 #endif /* _ASM_THREAD_INFO_H */