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thread_info.h

#ifndef _ALPHA_THREAD_INFO_H
#define _ALPHA_THREAD_INFO_H

#ifdef __KERNEL__

#ifndef __ASSEMBLY__
#include <asm/processor.h>
#include <asm/types.h>
#include <asm/hwrpb.h>
#endif

#ifndef __ASSEMBLY__
struct thread_info {
      struct pcb_struct pcb;        /* palcode state */

      struct task_struct      *task;            /* main task structure */
      unsigned int            flags;            /* low level flags */
      unsigned int            ieee_state; /* see fpu.h */

      struct exec_domain      *exec_domain;     /* execution domain */
      mm_segment_t            addr_limit; /* thread address space */
      unsigned          cpu;        /* current CPU */
      int               preempt_count; /* 0 => preemptable, <0 => BUG */

      int bpt_nsaved;
      unsigned long bpt_addr[2];          /* breakpoint handling  */
      unsigned int bpt_insn[2];

      struct restart_block    restart_block;
};

/*
 * Macros/functions for gaining access to the thread information structure.
 */
#define INIT_THREAD_INFO(tsk)             \
{                                   \
      .task       = &tsk,                 \
      .exec_domain      = &default_exec_domain, \
      .addr_limit = KERNEL_DS,            \
      .restart_block = {                  \
            .fn = do_no_restart_syscall,  \
      },                            \
}

#define init_thread_info      (init_thread_union.thread_info)
#define init_stack            (init_thread_union.stack)

/* How to get the thread information struct from C.  */
register struct thread_info *__current_thread_info __asm__("$8");
#define current_thread_info()  __current_thread_info

/* Thread information allocation.  */
#define THREAD_SIZE_ORDER 1
#define THREAD_SIZE (2*PAGE_SIZE)

#endif /* __ASSEMBLY__ */

#define PREEMPT_ACTIVE        0x40000000

/*
 * Thread information flags:
 * - these are process state flags and used from assembly
 * - pending work-to-be-done flags come first to fit in and immediate operand.
 *
 * TIF_SYSCALL_TRACE is known to be 0 via blbs.
 */
#define TIF_SYSCALL_TRACE     0     /* syscall trace active */
#define TIF_SIGPENDING        1     /* signal pending */
#define TIF_NEED_RESCHED      2     /* rescheduling necessary */
#define TIF_POLLING_NRFLAG    3     /* poll_idle is polling NEED_RESCHED */
#define TIF_DIE_IF_KERNEL     4     /* dik recursion lock */
#define TIF_UAC_NOPRINT       5     /* see sysinfo.h */
#define TIF_UAC_NOFIX         6
#define TIF_UAC_SIGBUS        7
#define TIF_MEMDIE            8
#define TIF_RESTORE_SIGMASK   9     /* restore signal mask in do_signal */
#define TIF_FREEZE            16    /* is freezing for suspend */

#define _TIF_SYSCALL_TRACE    (1<<TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING       (1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED     (1<<TIF_NEED_RESCHED)
#define _TIF_POLLING_NRFLAG   (1<<TIF_POLLING_NRFLAG)
#define _TIF_RESTORE_SIGMASK  (1<<TIF_RESTORE_SIGMASK)
#define _TIF_FREEZE           (1<<TIF_FREEZE)

/* Work to do on interrupt/exception return.  */
#define _TIF_WORK_MASK        (_TIF_SIGPENDING | _TIF_NEED_RESCHED)

/* Work to do on any return to userspace.  */
#define _TIF_ALLWORK_MASK     (_TIF_WORK_MASK         \
                         | _TIF_SYSCALL_TRACE)

#define ALPHA_UAC_SHIFT       6
#define ALPHA_UAC_MASK        (1 << TIF_UAC_NOPRINT | 1 << TIF_UAC_NOFIX | \
                         1 << TIF_UAC_SIGBUS)

#define SET_UNALIGN_CTL(task,value) ({                           \
      task_thread_info(task)->flags = ((task_thread_info(task)->flags &    \
            ~ALPHA_UAC_MASK)                               \
            | (((value) << ALPHA_UAC_SHIFT)       & (1<<TIF_UAC_NOPRINT))\
            | (((value) << (ALPHA_UAC_SHIFT + 1)) & (1<<TIF_UAC_SIGBUS)) \
            | (((value) << (ALPHA_UAC_SHIFT - 1)) & (1<<TIF_UAC_NOFIX)));\
      0; })

#define GET_UNALIGN_CTL(task,value) ({                      \
      put_user((task_thread_info(task)->flags & (1 << TIF_UAC_NOPRINT))\
              >> ALPHA_UAC_SHIFT                            \
             | (task_thread_info(task)->flags & (1 << TIF_UAC_SIGBUS))\
             >> (ALPHA_UAC_SHIFT + 1)                       \
             | (task_thread_info(task)->flags & (1 << TIF_UAC_NOFIX))\
             >> (ALPHA_UAC_SHIFT - 1),                      \
             (int __user *)(value));                        \
      })

#endif /* __KERNEL__ */
#endif /* _ALPHA_THREAD_INFO_H */

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