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thread_info.h

/*
 * Copyright (C) 2002-2003 Hewlett-Packard Co
 *    David Mosberger-Tang <davidm@hpl.hp.com>
 */
#ifndef _ASM_IA64_THREAD_INFO_H
#define _ASM_IA64_THREAD_INFO_H

#ifndef ASM_OFFSETS_C
#include <asm/asm-offsets.h>
#endif
#include <asm/processor.h>
#include <asm/ptrace.h>

#define PREEMPT_ACTIVE_BIT 30
#define PREEMPT_ACTIVE  (1 << PREEMPT_ACTIVE_BIT)

#ifndef __ASSEMBLY__

/*
 * On IA-64, we want to keep the task structure and kernel stack together, so they can be
 * mapped by a single TLB entry and so they can be addressed by the "current" pointer
 * without having to do pointer masking.
 */
struct thread_info {
      struct task_struct *task;     /* XXX not really needed, except for dup_task_struct() */
      struct exec_domain *exec_domain;/* execution domain */
      __u32 flags;                  /* thread_info flags (see TIF_*) */
      __u32 cpu;              /* current CPU */
      __u32 last_cpu;               /* Last CPU thread ran on */
      __u32 status;                 /* Thread synchronous flags */
      mm_segment_t addr_limit;      /* user-level address space limit */
      int preempt_count;            /* 0=premptable, <0=BUG; will also serve as bh-counter */
      struct restart_block restart_block;
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
      __u64 ac_stamp;
      __u64 ac_leave;
      __u64 ac_stime;
      __u64 ac_utime;
#endif
};

#define THREAD_SIZE                 KERNEL_STACK_SIZE

#define INIT_THREAD_INFO(tsk)             \
{                                   \
      .task       = &tsk,                 \
      .exec_domain      = &default_exec_domain, \
      .flags            = 0,              \
      .cpu        = 0,              \
      .addr_limit = KERNEL_DS,            \
      .preempt_count    = 0,              \
      .restart_block = {                  \
            .fn = do_no_restart_syscall,  \
      },                            \
}

#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR

#ifndef ASM_OFFSETS_C
/* how to get the thread information struct from C */
#define current_thread_info() ((struct thread_info *) ((char *) current + IA64_TASK_SIZE))
#define alloc_thread_info(tsk)      ((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
#define task_thread_info(tsk) ((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
#else
#define current_thread_info() ((struct thread_info *) 0)
#define alloc_thread_info(tsk)      ((struct thread_info *) 0)
#define task_thread_info(tsk) ((struct thread_info *) 0)
#endif
#define free_thread_info(ti)  /* nothing */
#define task_stack_page(tsk)  ((void *)(tsk))

#define __HAVE_THREAD_FUNCTIONS
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
#define setup_thread_stack(p, org)              \
      *task_thread_info(p) = *task_thread_info(org);  \
      task_thread_info(p)->ac_stime = 0;        \
      task_thread_info(p)->ac_utime = 0;        \
      task_thread_info(p)->task = (p);
#else
#define setup_thread_stack(p, org) \
      *task_thread_info(p) = *task_thread_info(org); \
      task_thread_info(p)->task = (p);
#endif
#define end_of_stack(p) (unsigned long *)((void *)(p) + IA64_RBS_OFFSET)

#define __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
#define alloc_task_struct()   ((struct task_struct *)__get_free_pages(GFP_KERNEL | __GFP_COMP, KERNEL_STACK_SIZE_ORDER))
#define free_task_struct(tsk) free_pages((unsigned long) (tsk), KERNEL_STACK_SIZE_ORDER)

#endif /* !__ASSEMBLY */

/*
 * thread information flags
 * - these are process state flags that various assembly files may need to access
 * - pending work-to-be-done flags are in least-significant 16 bits, other flags
 *   in top 16 bits
 */
#define TIF_SIGPENDING        0     /* signal pending */
#define TIF_NEED_RESCHED      1     /* rescheduling necessary */
#define TIF_SYSCALL_TRACE     2     /* syscall trace active */
#define TIF_SYSCALL_AUDIT     3     /* syscall auditing active */
#define TIF_SINGLESTEP        4     /* restore singlestep on return to user mode */
#define TIF_NOTIFY_RESUME     6     /* resumption notification requested */
#define TIF_POLLING_NRFLAG    16    /* true if poll_idle() is polling TIF_NEED_RESCHED */
#define TIF_MEMDIE            17
#define TIF_MCA_INIT          18    /* this task is processing MCA or INIT */
#define TIF_DB_DISABLED       19    /* debug trap disabled for fsyscall */
#define TIF_FREEZE            20    /* is freezing for suspend */
#define TIF_RESTORE_RSE       21    /* user RBS is newer than kernel RBS */

#define _TIF_SYSCALL_TRACE    (1 << TIF_SYSCALL_TRACE)
#define _TIF_SYSCALL_AUDIT    (1 << TIF_SYSCALL_AUDIT)
#define _TIF_SINGLESTEP       (1 << TIF_SINGLESTEP)
#define _TIF_SYSCALL_TRACEAUDIT     (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP)
#define _TIF_NOTIFY_RESUME    (1 << TIF_NOTIFY_RESUME)
#define _TIF_SIGPENDING       (1 << TIF_SIGPENDING)
#define _TIF_NEED_RESCHED     (1 << TIF_NEED_RESCHED)
#define _TIF_POLLING_NRFLAG   (1 << TIF_POLLING_NRFLAG)
#define _TIF_MCA_INIT         (1 << TIF_MCA_INIT)
#define _TIF_DB_DISABLED      (1 << TIF_DB_DISABLED)
#define _TIF_FREEZE           (1 << TIF_FREEZE)
#define _TIF_RESTORE_RSE      (1 << TIF_RESTORE_RSE)

/* "work to do on user-return" bits */
#define TIF_ALLWORK_MASK      (_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SYSCALL_AUDIT|\
                         _TIF_NEED_RESCHED|_TIF_SYSCALL_TRACE)
/* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */
#define TIF_WORK_MASK         (TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))

#define TS_POLLING            1     /* true if in idle loop and not sleeping */
#define TS_RESTORE_SIGMASK    2     /* restore signal mask in do_signal() */

#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)

#ifndef __ASSEMBLY__
#define HAVE_SET_RESTORE_SIGMASK    1
static inline void set_restore_sigmask(void)
{
      struct thread_info *ti = current_thread_info();
      ti->status |= TS_RESTORE_SIGMASK;
      set_bit(TIF_SIGPENDING, &ti->flags);
}
#endif      /* !__ASSEMBLY__ */

#endif /* _ASM_IA64_THREAD_INFO_H */

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