thread_info.h

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/*
 * Copyright (C) 2002-2003 Hewlett-Packard Co
 *  David Mosberger-Tang <[email protected]>
 */
#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  = INIT_PREEMPT_COUNT,   \
    .restart_block = {          \
        .fn = do_no_restart_syscall,    \
    },                  \
}

#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_node(tsk, node)   \
        ((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_node(tsk, node)   ((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 alloc_task_struct_node(node)                        \
({                                      \
    struct page *page = alloc_pages_node(node, GFP_KERNEL | __GFP_COMP, \
                         KERNEL_STACK_SIZE_ORDER);      \
    struct task_struct *ret = page ? page_address(page) : NULL;     \
                                        \
    ret;                                    \
})
#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_MEMDIE      17  /* is terminating due to OOM killer */
#define TIF_MCA_INIT        18  /* this task is processing MCA or INIT */
#define TIF_DB_DISABLED     19  /* debug trap disabled for fsyscall */
#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_MCA_INIT       (1 << TIF_MCA_INIT)
#define _TIF_DB_DISABLED    (1 << TIF_DB_DISABLED)
#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;
    WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
}
static inline void clear_restore_sigmask(void)
{
    current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
}
static inline bool test_restore_sigmask(void)
{
    return current_thread_info()->status & TS_RESTORE_SIGMASK;
}
static inline bool test_and_clear_restore_sigmask(void)
{
    struct thread_info *ti = current_thread_info();
    if (!(ti->status & TS_RESTORE_SIGMASK))
        return false;
    ti->status &= ~TS_RESTORE_SIGMASK;
    return true;
}
#endif  /* !__ASSEMBLY__ */

#endif /* _ASM_IA64_THREAD_INFO_H */