include/asm-alpha/thread_info.h

   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__
  13 struct 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         .restart_block = {                      \
  41                 .fn = do_no_restart_syscall,    \
  42         },                                      \
  43 }
  44
  45 #define init_thread_info        (init_thread_union.thread_info)
  46 #define init_stack              (init_thread_union.stack)
  47
  48 /* How to get the thread information struct from C.  */
  49 register struct thread_info *__current_thread_info __asm__("$8");
  50 #define current_thread_info()  __current_thread_info
  51
  52 /* Thread information allocation.  */
  53 #define THREAD_SIZE (2*PAGE_SIZE)
  54 #define alloc_thread_info(tsk) \
  55   ((struct thread_info *) __get_free_pages(GFP_KERNEL,1))
  56 #define free_thread_info(ti) free_pages((unsigned long) (ti), 1)
  57
  58 #endif /* __ASSEMBLY__ */
  59
  60 #define PREEMPT_ACTIVE          0x40000000
  61
  62 /*
  63  * Thread information flags:
  64  * - these are process state flags and used from assembly
  65  * - pending work-to-be-done flags come first to fit in and immediate operand.
  66  *
  67  * TIF_SYSCALL_TRACE is known to be 0 via blbs.
  68  */
  69 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  70 #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
  71 #define TIF_SIGPENDING          2       /* signal pending */
  72 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  73 #define TIF_POLLING_NRFLAG      4       /* poll_idle is polling NEED_RESCHED */
  74 #define TIF_DIE_IF_KERNEL       5       /* dik recursion lock */
  75 #define TIF_UAC_NOPRINT         6       /* see sysinfo.h */
  76 #define TIF_UAC_NOFIX           7
  77 #define TIF_UAC_SIGBUS          8
  78 #define TIF_MEMDIE              9
  79
  80 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
  81 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
  82 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
  83 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
  84 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
  85
  86 /* Work to do on interrupt/exception return.  */
  87 #define _TIF_WORK_MASK          (_TIF_NOTIFY_RESUME     \
  88                                  | _TIF_SIGPENDING      \
  89                                  | _TIF_NEED_RESCHED)
  90
  91 /* Work to do on any return to userspace.  */
  92 #define _TIF_ALLWORK_MASK       (_TIF_WORK_MASK         \
  93                                  | _TIF_SYSCALL_TRACE)
  94
  95 #define ALPHA_UAC_SHIFT         6
  96 #define ALPHA_UAC_MASK          (1 << TIF_UAC_NOPRINT | 1 << TIF_UAC_NOFIX | \
  97                                  1 << TIF_UAC_SIGBUS)
  98
  99 #define SET_UNALIGN_CTL(task,value)     ({                                   \
 100         (task)->thread_info->flags = (((task)->thread_info->flags &          \
 101                 ~ALPHA_UAC_MASK)                                             \
 102                 | (((value) << ALPHA_UAC_SHIFT)       & (1<<TIF_UAC_NOPRINT))\
 103                 | (((value) << (ALPHA_UAC_SHIFT + 1)) & (1<<TIF_UAC_SIGBUS)) \
 104                 | (((value) << (ALPHA_UAC_SHIFT - 1)) & (1<<TIF_UAC_NOFIX)));\
 105         0; })
 106
 107 #define GET_UNALIGN_CTL(task,value)     ({                              \
 108         put_user(((task)->thread_info->flags & (1 << TIF_UAC_NOPRINT))  \
 109                   >> ALPHA_UAC_SHIFT                                    \
 110                  | ((task)->thread_info->flags & (1 << TIF_UAC_SIGBUS)) \
 111                  >> (ALPHA_UAC_SHIFT + 1)                               \
 112                  | ((task)->thread_info->flags & (1 << TIF_UAC_NOFIX))  \
 113                  >> (ALPHA_UAC_SHIFT - 1),                              \
 114                  (int __user *)(value));                                \
 115         })
 116
 117 #endif /* __KERNEL__ */
 118 #endif /* _ALPHA_THREAD_INFO_H */