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 #define PREEMPT_ACTIVE_BIT 30
  15 #define PREEMPT_ACTIVE  (1 << PREEMPT_ACTIVE_BIT)
  16
  17 #ifndef __ASSEMBLY__
  18
  19 /*
  20  * On IA-64, we want to keep the task structure and kernel stack together, so they can be
  21  * mapped by a single TLB entry and so they can be addressed by the "current" pointer
  22  * without having to do pointer masking.
  23  */
  24 struct thread_info {
  25         struct task_struct *task;       /* XXX not really needed, except for dup_task_struct() */
  26         struct exec_domain *exec_domain;/* execution domain */
  27         __u32 flags;                    /* thread_info flags (see TIF_*) */
  28         __u32 cpu;                      /* current CPU */
  29         __u32 last_cpu;                 /* Last CPU thread ran on */
  30         __u32 status;                   /* Thread synchronous flags */
  31         mm_segment_t addr_limit;        /* user-level address space limit */
  32         int preempt_count;              /* 0=premptable, <0=BUG; will also serve as bh-counter */
  33         struct restart_block restart_block;
  34 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
  35         __u64 ac_stamp;
  36         __u64 ac_leave;
  37         __u64 ac_stime;
  38         __u64 ac_utime;
  39 #endif
  40 };
  41
  42 #define THREAD_SIZE                     KERNEL_STACK_SIZE
  43
  44 #define INIT_THREAD_INFO(tsk)                   \
  45 {                                               \
  46         .task           = &tsk,                 \
  47         .exec_domain    = &default_exec_domain, \
  48         .flags          = 0,                    \
  49         .cpu            = 0,                    \
  50         .addr_limit     = KERNEL_DS,            \
  51         .preempt_count  = INIT_PREEMPT_COUNT,   \
  52         .restart_block = {                      \
  53                 .fn = do_no_restart_syscall,    \
  54         },                                      \
  55 }
  56
  57 #ifndef ASM_OFFSETS_C
  58 /* how to get the thread information struct from C */
  59 #define current_thread_info()   ((struct thread_info *) ((char *) current + IA64_TASK_SIZE))
  60 #define alloc_thread_info_node(tsk, node)       \
  61                 ((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
  62 #define task_thread_info(tsk)   ((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
  63 #else
  64 #define current_thread_info()   ((struct thread_info *) 0)
  65 #define alloc_thread_info_node(tsk, node)       ((struct thread_info *) 0)
  66 #define task_thread_info(tsk)   ((struct thread_info *) 0)
  67 #endif
  68 #define free_thread_info(ti)    /* nothing */
  69 #define task_stack_page(tsk)    ((void *)(tsk))
  70
  71 #define __HAVE_THREAD_FUNCTIONS
  72 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
  73 #define setup_thread_stack(p, org)                      \
  74         *task_thread_info(p) = *task_thread_info(org);  \
  75         task_thread_info(p)->ac_stime = 0;              \
  76         task_thread_info(p)->ac_utime = 0;              \
  77         task_thread_info(p)->task = (p);
  78 #else
  79 #define setup_thread_stack(p, org) \
  80         *task_thread_info(p) = *task_thread_info(org); \
  81         task_thread_info(p)->task = (p);
  82 #endif
  83 #define end_of_stack(p) (unsigned long *)((void *)(p) + IA64_RBS_OFFSET)
  84
  85 #define alloc_task_struct_node(node)                                            \
  86 ({                                                                              \
  87         struct page *page = alloc_pages_node(node, GFP_KERNEL | __GFP_COMP,     \
  88                                              KERNEL_STACK_SIZE_ORDER);          \
  89         struct task_struct *ret = page ? page_address(page) : NULL;             \
  90                                                                                 \
  91         ret;                                                                    \
  92 })
  93 #define free_task_struct(tsk)   free_pages((unsigned long) (tsk), KERNEL_STACK_SIZE_ORDER)
  94
  95 #endif /* !__ASSEMBLY */
  96
  97 /*
  98  * thread information flags
  99  * - these are process state flags that various assembly files may need to access
 100  * - pending work-to-be-done flags are in least-significant 16 bits, other flags
 101  *   in top 16 bits
 102  */
 103 #define TIF_SIGPENDING          0       /* signal pending */
 104 #define TIF_NEED_RESCHED        1       /* rescheduling necessary */
 105 #define TIF_SYSCALL_TRACE       2       /* syscall trace active */
 106 #define TIF_SYSCALL_AUDIT       3       /* syscall auditing active */
 107 #define TIF_SINGLESTEP          4       /* restore singlestep on return to user mode */
 108 #define TIF_NOTIFY_RESUME       6       /* resumption notification requested */
 109 #define TIF_MEMDIE              17      /* is terminating due to OOM killer */
 110 #define TIF_MCA_INIT            18      /* this task is processing MCA or INIT */
 111 #define TIF_DB_DISABLED         19      /* debug trap disabled for fsyscall */
 112 #define TIF_RESTORE_RSE         21      /* user RBS is newer than kernel RBS */
 113
 114 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 115 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
 116 #define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
 117 #define _TIF_SYSCALL_TRACEAUDIT (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP)
 118 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 119 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 120 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 121 #define _TIF_MCA_INIT           (1 << TIF_MCA_INIT)
 122 #define _TIF_DB_DISABLED        (1 << TIF_DB_DISABLED)
 123 #define _TIF_RESTORE_RSE        (1 << TIF_RESTORE_RSE)
 124
 125 /* "work to do on user-return" bits */
 126 #define TIF_ALLWORK_MASK        (_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SYSCALL_AUDIT|\
 127                                  _TIF_NEED_RESCHED|_TIF_SYSCALL_TRACE)
 128 /* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */
 129 #define TIF_WORK_MASK           (TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))
 130
 131 #define TS_POLLING              1       /* true if in idle loop and not sleeping */
 132 #define TS_RESTORE_SIGMASK      2       /* restore signal mask in do_signal() */
 133
 134 #ifndef __ASSEMBLY__
 135 #define HAVE_SET_RESTORE_SIGMASK        1
 136 static inline void set_restore_sigmask(void)
 137 {
 138         struct thread_info *ti = current_thread_info();
 139         ti->status |= TS_RESTORE_SIGMASK;
 140         WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
 141 }
 142 static inline void clear_restore_sigmask(void)
 143 {
 144         current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
 145 }
 146 static inline bool test_restore_sigmask(void)
 147 {
 148         return current_thread_info()->status & TS_RESTORE_SIGMASK;
 149 }
 150 static inline bool test_and_clear_restore_sigmask(void)
 151 {
 152         struct thread_info *ti = current_thread_info();
 153         if (!(ti->status & TS_RESTORE_SIGMASK))
 154                 return false;
 155         ti->status &= ~TS_RESTORE_SIGMASK;
 156         return true;
 157 }
 158 #endif  /* !__ASSEMBLY__ */
 159
 160 #endif /* _ASM_IA64_THREAD_INFO_H */