LXR linux/arch/alpha/include/asm/thread

   1#ifndef _ALPHA_THREAD_INFO_H
   2#define _ALPHA_THREAD_INFO_H
   3
   4#ifdef __KERNEL__
   5
   6#ifndef __ASSEMBLY__
   7#include <asm/processor.h>
   8#include <asm/types.h>
   9#include <asm/hwrpb.h>
  10#endif
  11
  12#ifndef __ASSEMBLY__
  13struct thread_info {
  14        struct pcb_struct       pcb;            /* palcode state */
  15
  16        struct task_struct      *task;          /* main task structure */
  17        unsigned int            flags;          /* low level flags */
  18        unsigned int            ieee_state;     /* see fpu.h */
  19
  20        struct exec_domain      *exec_domain;   /* execution domain */
  21        mm_segment_t            addr_limit;     /* thread address space */
  22        unsigned                cpu;            /* current CPU */
  23        int                     preempt_count; /* 0 => preemptable, <0 => BUG */
  24
  25        int bpt_nsaved;
  26        unsigned long bpt_addr[2];              /* breakpoint handling  */
  27        unsigned int bpt_insn[2];
  28
  29        struct restart_block    restart_block;
  30};
  31
  32/*
  33 * Macros/functions for gaining access to the thread information structure.
  34 */
  35#define INIT_THREAD_INFO(tsk)                   \
  36{                                               \
  37        .task           = &tsk,                 \
  38        .exec_domain    = &default_exec_domain, \
  39        .addr_limit     = KERNEL_DS,            \
  40        .preempt_count  = INIT_PREEMPT_COUNT,   \
  41        .restart_block = {                      \
  42                .fn = do_no_restart_syscall,    \
  43        },                                      \
  44}
  45
  46#define init_thread_info        (init_thread_union.thread_info)
  47#define init_stack              (init_thread_union.stack)
  48
  49/* How to get the thread information struct from C.  */
  50register struct thread_info *__current_thread_info __asm__("$8");
  51#define current_thread_info()  __current_thread_info
  52
  53#endif /* __ASSEMBLY__ */
  54
  55/* Thread information allocation.  */
  56#define THREAD_SIZE_ORDER 1
  57#define THREAD_SIZE (2*PAGE_SIZE)
  58
  59#define PREEMPT_ACTIVE          0x40000000
  60
  61/*
  62 * Thread information flags:
  63 * - these are process state flags and used from assembly
  64 * - pending work-to-be-done flags come first and must be assigned to be
  65 *   within bits 0 to 7 to fit in and immediate operand.
  66 * - ALPHA_UAC_SHIFT below must be kept consistent with the unaligned
  67 *   control flags.
  68 *
  69 * TIF_SYSCALL_TRACE is known to be 0 via blbs.
  70 */
  71#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  72#define TIF_NOTIFY_RESUME       1       /* callback before returning to user */
  73#define TIF_SIGPENDING          2       /* signal pending */
  74#define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  75#define TIF_POLLING_NRFLAG      8       /* poll_idle is polling NEED_RESCHED */
  76#define TIF_DIE_IF_KERNEL       9       /* dik recursion lock */
  77#define TIF_UAC_NOPRINT         10      /* ! Preserve sequence of following */
  78#define TIF_UAC_NOFIX           11      /* ! flags as they match            */
  79#define TIF_UAC_SIGBUS          12      /* ! userspace part of 'osf_sysinfo' */
  80#define TIF_MEMDIE              13      /* is terminating due to OOM killer */
  81#define TIF_RESTORE_SIGMASK     14      /* restore signal mask in do_signal */
  82
  83#define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
  84#define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
  85#define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
  86#define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
  87#define _TIF_RESTORE_SIGMASK    (1<<TIF_RESTORE_SIGMASK)
  88#define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
  89
  90/* Work to do on interrupt/exception return.  */
  91#define _TIF_WORK_MASK          (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
  92                                 _TIF_NOTIFY_RESUME)
  93
  94/* Work to do on any return to userspace.  */
  95#define _TIF_ALLWORK_MASK       (_TIF_WORK_MASK         \
  96                                 | _TIF_SYSCALL_TRACE)
  97
  98#define ALPHA_UAC_SHIFT         TIF_UAC_NOPRINT
  99#define ALPHA_UAC_MASK          (1 << TIF_UAC_NOPRINT | 1 << TIF_UAC_NOFIX | \
 100                                 1 << TIF_UAC_SIGBUS)
 101
 102#define SET_UNALIGN_CTL(task,value)     ({                                   \
 103        task_thread_info(task)->flags = ((task_thread_info(task)->flags &    \
 104                ~ALPHA_UAC_MASK)                                             \
 105                | (((value) << ALPHA_UAC_SHIFT)       & (1<<TIF_UAC_NOPRINT))\
 106                | (((value) << (ALPHA_UAC_SHIFT + 1)) & (1<<TIF_UAC_SIGBUS)) \
 107                | (((value) << (ALPHA_UAC_SHIFT - 1)) & (1<<TIF_UAC_NOFIX)));\
 108        0; })
 109
 110#define GET_UNALIGN_CTL(task,value)     ({                              \
 111        put_user((task_thread_info(task)->flags & (1 << TIF_UAC_NOPRINT))\
 112                  >> ALPHA_UAC_SHIFT                                    \
 113                 | (task_thread_info(task)->flags & (1 << TIF_UAC_SIGBUS))\
 114                 >> (ALPHA_UAC_SHIFT + 1)                               \
 115                 | (task_thread_info(task)->flags & (1 << TIF_UAC_NOFIX))\
 116                 >> (ALPHA_UAC_SHIFT - 1),                              \
 117                 (int __user *)(value));                                \
 118        })
 119
 120#endif /* __KERNEL__ */
 121#endif /* _ALPHA_THREAD_INFO_H */
 122