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thread_info.h

/*
 * Copyright (C) 2006 Atmark Techno, Inc.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License. See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#ifndef _ASM_MICROBLAZE_THREAD_INFO_H
#define _ASM_MICROBLAZE_THREAD_INFO_H

#ifdef __KERNEL__

/* we have 8k stack */
#define THREAD_SHIFT          13
#define THREAD_SIZE           (1 << THREAD_SHIFT)
#define THREAD_SIZE_ORDER     1

#ifndef __ASSEMBLY__
# include <linux/types.h>
# include <asm/processor.h>
# include <asm/segment.h>

/*
 * low level task data that entry.S needs immediate access to
 * - this struct should fit entirely inside of one cache line
 * - this struct shares the supervisor stack pages
 * - if the contents of this structure are changed, the assembly constants
 *     must also be changed
 */

struct cpu_context {
      __u32 r1; /* stack pointer */
      __u32 r2;
      /* dedicated registers */
      __u32 r13;
      __u32 r14;
      __u32 r15;
      __u32 r16;
      __u32 r17;
      __u32 r18;
      /* non-volatile registers */
      __u32 r19;
      __u32 r20;
      __u32 r21;
      __u32 r22;
      __u32 r23;
      __u32 r24;
      __u32 r25;
      __u32 r26;
      __u32 r27;
      __u32 r28;
      __u32 r29;
      __u32 r30;
      /* r31 is used as current task pointer */
      /* special purpose registers */
      __u32 msr;
      __u32 ear;
      __u32 esr;
      __u32 fsr;
};

struct thread_info {
      struct task_struct      *task; /* main task structure */
      struct exec_domain      *exec_domain; /* execution domain */
      unsigned long           flags; /* low level flags */
      unsigned long           status; /* thread-synchronous flags */
      __u32             cpu; /* current CPU */
      __s32             preempt_count; /* 0 => preemptable,< 0 => BUG*/
      mm_segment_t            addr_limit; /* thread address space */
      struct restart_block    restart_block;

      struct cpu_context      cpu_context;
};

/*
 * macros/functions for gaining access to the thread information structure
 */
#define INIT_THREAD_INFO(tsk)             \
{                                   \
      .task       = &tsk,                 \
      .exec_domain      = &default_exec_domain, \
      .flags            = 0,              \
      .cpu        = 0,              \
      .preempt_count    = INIT_PREEMPT_COUNT,   \
      .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 */
static inline struct thread_info *current_thread_info(void)
{
      register unsigned long sp asm("r1");

      return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
}

/* thread information allocation */
#endif /* __ASSEMBLY__ */

#define PREEMPT_ACTIVE        0x10000000

/*
 * thread information flags
 * - these are process state flags that various assembly files may
 *   need to access
 * - pending work-to-be-done flags are in LSW
 * - other flags in MSW
 */
#define TIF_SYSCALL_TRACE     0 /* syscall trace active */
#define TIF_NOTIFY_RESUME     1 /* resumption notification requested */
#define TIF_SIGPENDING        2 /* signal pending */
#define TIF_NEED_RESCHED      3 /* rescheduling necessary */
/* restore singlestep on return to user mode */
#define TIF_SINGLESTEP        4
#define TIF_IRET        5 /* return with iret */
#define TIF_MEMDIE            6
#define TIF_SYSCALL_AUDIT     9       /* syscall auditing active */
#define TIF_SECCOMP           10      /* secure computing */
#define TIF_FREEZE            14    /* Freezing for suspend */

/* FIXME change in entry.S */
#define TIF_KERNEL_TRACE      8     /* kernel trace active */

/* true if poll_idle() is polling TIF_NEED_RESCHED */
#define TIF_POLLING_NRFLAG    16

#define _TIF_SYSCALL_TRACE    (1<<TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME    (1<<TIF_NOTIFY_RESUME)
#define _TIF_SIGPENDING       (1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED     (1<<TIF_NEED_RESCHED)
#define _TIF_SINGLESTEP       (1<<TIF_SINGLESTEP)
#define _TIF_IRET       (1<<TIF_IRET)
#define _TIF_POLLING_NRFLAG   (1<<TIF_POLLING_NRFLAG)
#define _TIF_FREEZE           (1<<TIF_FREEZE)
#define _TIF_SYSCALL_AUDIT    (1 << TIF_SYSCALL_AUDIT)
#define _TIF_SECCOMP          (1 << TIF_SECCOMP)
#define _TIF_KERNEL_TRACE     (1 << TIF_KERNEL_TRACE)

/* work to do in syscall trace */
#define _TIF_WORK_SYSCALL_MASK  (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
                         _TIF_SYSCALL_AUDIT | _TIF_SECCOMP)

/* work to do on interrupt/exception return */
#define _TIF_WORK_MASK        0x0000FFFE

/* work to do on any return to u-space */
#define _TIF_ALLWORK_MASK     0x0000FFFF

/*
 * Thread-synchronous status.
 *
 * This is different from the flags in that nobody else
 * ever touches our thread-synchronous status, so we don't
 * have to worry about atomic accesses.
 */
/* FPU was used by this task this quantum (SMP) */
#define TS_USEDFPU            0x0001
#define TS_RESTORE_SIGMASK    0x0002

#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, (unsigned long *)&ti->flags);
}
#endif

#endif /* __KERNEL__ */
#endif /* _ASM_MICROBLAZE_THREAD_INFO_H */

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