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        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
 134static 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}
 140static inline void clear_restore_sigmask(void)
 141{
 142        current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
 143}
 144static inline bool test_restore_sigmask(void)
 145{
 146        return current_thread_info()->status & TS_RESTORE_SIGMASK;
 147}
 148static 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 */
 159