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         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 */
  69 register 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 */