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/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
  28struct 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 */
  77register 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#define THREAD_INFO_ORDER  1
  84
  85#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
  86
  87BTFIXUPDEF_CALL(struct thread_info *, alloc_thread_info, void)
  88#define alloc_thread_info(tsk) BTFIXUP_CALL(alloc_thread_info)()
  89
  90BTFIXUPDEF_CALL(void, free_thread_info, struct thread_info *)
  91#define free_thread_info(ti) BTFIXUP_CALL(free_thread_info)(ti)
  92
  93#endif /* __ASSEMBLY__ */
  94
  95/*
  96 * Size of kernel stack for each process.
  97 * Observe the order of get_free_pages() in alloc_thread_info().
  98 * The sun4 has 8K stack too, because it's short on memory, and 16K is a waste.
  99 */
 100#define THREAD_SIZE             8192
 101
 102/*
 103 * Offsets in thread_info structure, used in assembly code
 104 * The "#define REGWIN_SZ 0x40" was abolished, so no multiplications.
 105 */
 106#define TI_UWINMASK     0x00    /* uwinmask */
 107#define TI_TASK         0x04
 108#define TI_EXECDOMAIN   0x08    /* exec_domain */
 109#define TI_FLAGS        0x0c
 110#define TI_CPU          0x10
 111#define TI_PREEMPT      0x14    /* preempt_count */
 112#define TI_SOFTIRQ      0x18    /* softirq_count */
 113#define TI_HARDIRQ      0x1c    /* hardirq_count */
 114#define TI_KSP          0x20    /* ksp */
 115#define TI_KPC          0x24    /* kpc (ldd'ed with kpc) */
 116#define TI_KPSR         0x28    /* kpsr */
 117#define TI_KWIM         0x2c    /* kwim (ldd'ed with kpsr) */
 118#define TI_REG_WINDOW   0x30
 119#define TI_RWIN_SPTRS   0x230
 120#define TI_W_SAVED      0x250
 121/* #define TI_RESTART_BLOCK 0x25n */ /* Nobody cares */
 122
 123#define PREEMPT_ACTIVE          0x4000000
 124
 125/*
 126 * thread information flag bit numbers
 127 */
 128#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 129#define TIF_NOTIFY_RESUME       1       /* callback before returning to user */
 130#define TIF_SIGPENDING          2       /* signal pending */
 131#define TIF_NEED_RESCHED        3       /* rescheduling necessary */
 132#define TIF_RESTORE_SIGMASK     4       /* restore signal mask in do_signal() */
 133#define TIF_USEDFPU             8       /* FPU was used by this task
 134                                         * this quantum (SMP) */
 135#define TIF_POLLING_NRFLAG      9       /* true if poll_idle() is polling
 136                                         * TIF_NEED_RESCHED */
 137#define TIF_MEMDIE              10
 138#define TIF_FREEZE              11      /* is freezing for suspend */
 139
 140/* as above, but as bit values */
 141#define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 142#define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 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#define _TIF_DO_NOTIFY_RESUME_MASK      (_TIF_NOTIFY_RESUME | \
 150                                         _TIF_SIGPENDING | \
 151                                         _TIF_RESTORE_SIGMASK)
 152#define _TIF_FREEZE             (1<<TIF_FREEZE)
 153
 154#endif /* __KERNEL__ */
 155
 156#endif /* _ASM_THREAD_INFO_H */
 157