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#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 */
  21struct thread_info {
  22        struct task_struct *task;       /* XXX not really needed, except for dup_task_struct() */
  23        __u32 flags;                    /* thread_info flags (see TIF_*) */
  24        __u32 cpu;                      /* current CPU */
  25        __u32 last_cpu;                 /* Last CPU thread ran on */
  26        __u32 status;                   /* Thread synchronous flags */
  27        mm_segment_t addr_limit;        /* user-level address space limit */
  28        int preempt_count;              /* 0=premptable, <0=BUG; will also serve as bh-counter */
  29#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
  30        __u64 ac_stamp;
  31        __u64 ac_leave;
  32        __u64 ac_stime;
  33        __u64 ac_utime;
  34#endif
  35};
  36
  37#define THREAD_SIZE                     KERNEL_STACK_SIZE
  38
  39#define INIT_THREAD_INFO(tsk)                   \
  40{                                               \
  41        .task           = &tsk,                 \
  42        .flags          = 0,                    \
  43        .cpu            = 0,                    \
  44        .addr_limit     = KERNEL_DS,            \
  45        .preempt_count  = INIT_PREEMPT_COUNT,   \
  46}
  47
  48#ifndef ASM_OFFSETS_C
  49/* how to get the thread information struct from C */
  50#define current_thread_info()   ((struct thread_info *) ((char *) current + IA64_TASK_SIZE))
  51#define alloc_thread_info_node(tsk, node)       \
  52                ((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
  53#define task_thread_info(tsk)   ((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
  54#else
  55#define current_thread_info()   ((struct thread_info *) 0)
  56#define alloc_thread_info_node(tsk, node)       ((struct thread_info *) 0)
  57#define task_thread_info(tsk)   ((struct thread_info *) 0)
  58#endif
  59#define free_thread_info(ti)    /* nothing */
  60#define task_stack_page(tsk)    ((void *)(tsk))
  61
  62#define __HAVE_THREAD_FUNCTIONS
  63#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
  64#define setup_thread_stack(p, org)                      \
  65        *task_thread_info(p) = *task_thread_info(org);  \
  66        task_thread_info(p)->ac_stime = 0;              \
  67        task_thread_info(p)->ac_utime = 0;              \
  68        task_thread_info(p)->task = (p);
  69#else
  70#define setup_thread_stack(p, org) \
  71        *task_thread_info(p) = *task_thread_info(org); \
  72        task_thread_info(p)->task = (p);
  73#endif
  74#define end_of_stack(p) (unsigned long *)((void *)(p) + IA64_RBS_OFFSET)
  75
  76#define alloc_task_struct_node(node)                                            \
  77({                                                                              \
  78        struct page *page = alloc_pages_node(node, GFP_KERNEL | __GFP_COMP,     \
  79                                             KERNEL_STACK_SIZE_ORDER);          \
  80        struct task_struct *ret = page ? page_address(page) : NULL;             \
  81                                                                                \
  82        ret;                                                                    \
  83})
  84#define free_task_struct(tsk)   free_pages((unsigned long) (tsk), KERNEL_STACK_SIZE_ORDER)
  85
  86#endif /* !__ASSEMBLY */
  87
  88/*
  89 * thread information flags
  90 * - these are process state flags that various assembly files may need to access
  91 * - pending work-to-be-done flags are in least-significant 16 bits, other flags
  92 *   in top 16 bits
  93 */
  94#define TIF_SIGPENDING          0       /* signal pending */
  95#define TIF_NEED_RESCHED        1       /* rescheduling necessary */
  96#define TIF_SYSCALL_TRACE       2       /* syscall trace active */
  97#define TIF_SYSCALL_AUDIT       3       /* syscall auditing active */
  98#define TIF_SINGLESTEP          4       /* restore singlestep on return to user mode */
  99#define TIF_NOTIFY_RESUME       6       /* resumption notification requested */
 100#define TIF_MEMDIE              17      /* is terminating due to OOM killer */
 101#define TIF_MCA_INIT            18      /* this task is processing MCA or INIT */
 102#define TIF_DB_DISABLED         19      /* debug trap disabled for fsyscall */
 103#define TIF_RESTORE_RSE         21      /* user RBS is newer than kernel RBS */
 104#define TIF_POLLING_NRFLAG      22      /* idle is polling for TIF_NEED_RESCHED */
 105
 106#define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 107#define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
 108#define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
 109#define _TIF_SYSCALL_TRACEAUDIT (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP)
 110#define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 111#define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 112#define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 113#define _TIF_MCA_INIT           (1 << TIF_MCA_INIT)
 114#define _TIF_DB_DISABLED        (1 << TIF_DB_DISABLED)
 115#define _TIF_RESTORE_RSE        (1 << TIF_RESTORE_RSE)
 116#define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
 117
 118/* "work to do on user-return" bits */
 119#define TIF_ALLWORK_MASK        (_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SYSCALL_AUDIT|\
 120                                 _TIF_NEED_RESCHED|_TIF_SYSCALL_TRACE)
 121/* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */
 122#define TIF_WORK_MASK           (TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))
 123
 124#define TS_RESTORE_SIGMASK      2       /* restore signal mask in do_signal() */
 125
 126#ifndef __ASSEMBLY__
 127#define HAVE_SET_RESTORE_SIGMASK        1
 128static inline void set_restore_sigmask(void)
 129{
 130        struct thread_info *ti = current_thread_info();
 131        ti->status |= TS_RESTORE_SIGMASK;
 132        WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
 133}
 134static inline void clear_restore_sigmask(void)
 135{
 136        current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
 137}
 138static inline bool test_restore_sigmask(void)
 139{
 140        return current_thread_info()->status & TS_RESTORE_SIGMASK;
 141}
 142static inline bool test_and_clear_restore_sigmask(void)
 143{
 144        struct thread_info *ti = current_thread_info();
 145        if (!(ti->status & TS_RESTORE_SIGMASK))
 146                return false;
 147        ti->status &= ~TS_RESTORE_SIGMASK;
 148        return true;
 149}
 150#endif  /* !__ASSEMBLY__ */
 151
 152#endif /* _ASM_IA64_THREAD_INFO_H */
 153