/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) 2006 Atmark Techno, Inc.
 */

#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 __ASSEMBLER__
# include <linux/types.h>
# include <asm/processor.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 */
        unsigned long           flags; /* low level flags */
        unsigned long           status; /* thread-synchronous flags */
        __u32                   cpu; /* current CPU */
        __s32                   preempt_count; /* 0 => preemptable,< 0 => BUG*/

        struct cpu_context      cpu_context;
};

/*
 * macros/functions for gaining access to the thread information structure
 */
#define INIT_THREAD_INFO(tsk)                   \
{                                               \
        .task           = &tsk,                 \
        .flags          = 0,                    \
        .cpu            = 0,                    \
        .preempt_count  = INIT_PREEMPT_COUNT,   \
}

/* 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 /* __ASSEMBLER__ */

/*
 * 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_NOTIFY_SIGNAL       5       /* signal notifications exist */
#define TIF_MEMDIE              6       /* is terminating due to OOM killer */
#define TIF_SYSCALL_AUDIT       9       /* syscall auditing active */
#define TIF_SECCOMP             10      /* secure computing */

/* 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_NOTIFY_SIGNAL      (1 << TIF_NOTIFY_SIGNAL)
#define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
#define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
#define _TIF_SECCOMP            (1 << TIF_SECCOMP)

/* 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

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