LXR linux/arch/ia64/include/asm/thread

   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 */
  24struct 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
 136static 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}
 142static inline void clear_restore_sigmask(void)
 143{
 144        current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
 145}
 146static inline bool test_restore_sigmask(void)
 147{
 148        return current_thread_info()->status & TS_RESTORE_SIGMASK;
 149}
 150static 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 */
 161