arch/ia64/include/asm/thread_info.h

   1 /*
   2  * Copyright (C) 2002-2003 Hewlett-Packard Co
   3  *      David Mosberger-Tang <davidm@hpl.hp.com>
   4  */
   5 #ifndef _ASM_IA64_THREAD_INFO_H
   6 #define _ASM_IA64_THREAD_INFO_H
   7
   8 #ifndef ASM_OFFSETS_C
   9 #include <asm/asm-offsets.h>
  10 #endif
  11 #include <asm/processor.h>
  12 #include <asm/ptrace.h>
  13
  14 #ifndef __ASSEMBLY__
  15
  16 /*
  17  * On IA-64, we want to keep the task structure and kernel stack together, so they can be
  18  * mapped by a single TLB entry and so they can be addressed by the "current" pointer
  19  * without having to do pointer masking.
  20  */
  21 struct thread_info {
  22         struct task_struct *task;       /* XXX not really needed, except for dup_task_struct() */
  23         struct exec_domain *exec_domain;/* execution domain */
  24         __u32 flags;                    /* thread_info flags (see TIF_*) */
  25         __u32 cpu;                      /* current CPU */
  26         __u32 last_cpu;                 /* Last CPU thread ran on */
  27         __u32 status;                   /* Thread synchronous flags */
  28         mm_segment_t addr_limit;        /* user-level address space limit */
  29         int preempt_count;              /* 0=premptable, <0=BUG; will also serve as bh-counter */
  30         struct restart_block restart_block;
  31 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
  32         __u64 ac_stamp;
  33         __u64 ac_leave;
  34         __u64 ac_stime;
  35         __u64 ac_utime;
  36 #endif
  37 };
  38
  39 #define THREAD_SIZE                     KERNEL_STACK_SIZE
  40
  41 #define INIT_THREAD_INFO(tsk)                   \
  42 {                                               \
  43         .task           = &tsk,                 \
  44         .exec_domain    = &default_exec_domain, \
  45         .flags          = 0,                    \
  46         .cpu            = 0,                    \
  47         .addr_limit     = KERNEL_DS,            \
  48         .preempt_count  = INIT_PREEMPT_COUNT,   \
  49         .restart_block = {                      \
  50                 .fn = do_no_restart_syscall,    \
  51         },                                      \
  52 }
  53
  54 #ifndef ASM_OFFSETS_C
  55 /* how to get the thread information struct from C */
  56 #define current_thread_info()   ((struct thread_info *) ((char *) current + IA64_TASK_SIZE))
  57 #define alloc_thread_info_node(tsk, node)       \
  58                 ((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
  59 #define task_thread_info(tsk)   ((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
  60 #else
  61 #define current_thread_info()   ((struct thread_info *) 0)
  62 #define alloc_thread_info_node(tsk, node)       ((struct thread_info *) 0)
  63 #define task_thread_info(tsk)   ((struct thread_info *) 0)
  64 #endif
  65 #define free_thread_info(ti)    /* nothing */
  66 #define task_stack_page(tsk)    ((void *)(tsk))
  67
  68 #define __HAVE_THREAD_FUNCTIONS
  69 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
  70 #define setup_thread_stack(p, org)                      \
  71         *task_thread_info(p) = *task_thread_info(org);  \
  72         task_thread_info(p)->ac_stime = 0;              \
  73         task_thread_info(p)->ac_utime = 0;              \
  74         task_thread_info(p)->task = (p);
  75 #else
  76 #define setup_thread_stack(p, org) \
  77         *task_thread_info(p) = *task_thread_info(org); \
  78         task_thread_info(p)->task = (p);
  79 #endif
  80 #define end_of_stack(p) (unsigned long *)((void *)(p) + IA64_RBS_OFFSET)
  81
  82 #define alloc_task_struct_node(node)                                            \
  83 ({                                                                              \
  84         struct page *page = alloc_pages_node(node, GFP_KERNEL | __GFP_COMP,     \
  85                                              KERNEL_STACK_SIZE_ORDER);          \
  86         struct task_struct *ret = page ? page_address(page) : NULL;             \
  87                                                                                 \
  88         ret;                                                                    \
  89 })
  90 #define free_task_struct(tsk)   free_pages((unsigned long) (tsk), KERNEL_STACK_SIZE_ORDER)
  91
  92 #endif /* !__ASSEMBLY */
  93
  94 /*
  95  * thread information flags
  96  * - these are process state flags that various assembly files may need to access
  97  * - pending work-to-be-done flags are in least-significant 16 bits, other flags
  98  *   in top 16 bits
  99  */
 100 #define TIF_SIGPENDING          0       /* signal pending */
 101 #define TIF_NEED_RESCHED        1       /* rescheduling necessary */
 102 #define TIF_SYSCALL_TRACE       2       /* syscall trace active */
 103 #define TIF_SYSCALL_AUDIT       3       /* syscall auditing active */
 104 #define TIF_SINGLESTEP          4       /* restore singlestep on return to user mode */
 105 #define TIF_NOTIFY_RESUME       6       /* resumption notification requested */
 106 #define TIF_MEMDIE              17      /* is terminating due to OOM killer */
 107 #define TIF_MCA_INIT            18      /* this task is processing MCA or INIT */
 108 #define TIF_DB_DISABLED         19      /* debug trap disabled for fsyscall */
 109 #define TIF_RESTORE_RSE         21      /* user RBS is newer than kernel RBS */
 110 #define TIF_POLLING_NRFLAG      22      /* idle is polling for TIF_NEED_RESCHED */
 111
 112 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 113 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
 114 #define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
 115 #define _TIF_SYSCALL_TRACEAUDIT (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP)
 116 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 117 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 118 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 119 #define _TIF_MCA_INIT           (1 << TIF_MCA_INIT)
 120 #define _TIF_DB_DISABLED        (1 << TIF_DB_DISABLED)
 121 #define _TIF_RESTORE_RSE        (1 << TIF_RESTORE_RSE)
 122 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
 123
 124 /* "work to do on user-return" bits */
 125 #define TIF_ALLWORK_MASK        (_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SYSCALL_AUDIT|\
 126                                  _TIF_NEED_RESCHED|_TIF_SYSCALL_TRACE)
 127 /* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */
 128 #define TIF_WORK_MASK           (TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))
 129
 130 #define TS_RESTORE_SIGMASK      2       /* restore signal mask in do_signal() */
 131
 132 #ifndef __ASSEMBLY__
 133 #define HAVE_SET_RESTORE_SIGMASK        1
 134 static inline void set_restore_sigmask(void)
 135 {
 136         struct thread_info *ti = current_thread_info();
 137         ti->status |= TS_RESTORE_SIGMASK;
 138         WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
 139 }
 140 static inline void clear_restore_sigmask(void)
 141 {
 142         current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
 143 }
 144 static inline bool test_restore_sigmask(void)
 145 {
 146         return current_thread_info()->status & TS_RESTORE_SIGMASK;
 147 }
 148 static inline bool test_and_clear_restore_sigmask(void)
 149 {
 150         struct thread_info *ti = current_thread_info();
 151         if (!(ti->status & TS_RESTORE_SIGMASK))
 152                 return false;
 153         ti->status &= ~TS_RESTORE_SIGMASK;
 154         return true;
 155 }
 156 #endif  /* !__ASSEMBLY__ */
 157
 158 #endif /* _ASM_IA64_THREAD_INFO_H */