/*
 * Copyright (C) 2013 Altera Corporation
 * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
 * Copyright (C) 2004 Microtronix Datacom Ltd
 * Copyright (C) 2001 Ken Hill (khill@microtronix.com)
 *                    Vic Phillips (vic@microtronix.com)
 *
 * based on SPARC asm/processor_32.h which is:
 *
 * Copyright (C) 1994 David S. Miller
 *
 * 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_NIOS2_PROCESSOR_H
#define _ASM_NIOS2_PROCESSOR_H

#include <asm/ptrace.h>
#include <asm/registers.h>
#include <asm/page.h>

#define NIOS2_FLAG_KTHREAD      0x00000001      /* task is a kernel thread */

#define NIOS2_OP_NOP            0x1883a
#define NIOS2_OP_BREAK          0x3da03a

#ifdef __KERNEL__

#define STACK_TOP       TASK_SIZE
#define STACK_TOP_MAX   STACK_TOP

#endif /* __KERNEL__ */

/* Kuser helpers is mapped to this user space address */
#define KUSER_BASE              0x1000
#define KUSER_SIZE              (PAGE_SIZE)
#ifndef __ASSEMBLER__

# define TASK_SIZE              0x7FFF0000UL
# define TASK_UNMAPPED_BASE     (PAGE_ALIGN(TASK_SIZE / 3))

/* The Nios processor specific thread struct. */
struct thread_struct {
        struct pt_regs *kregs;

        /* Context switch saved kernel state. */
        unsigned long ksp;
        unsigned long kpsr;
};

# define INIT_THREAD {                  \
        .kregs  = NULL,                 \
        .ksp    = 0,                    \
        .kpsr   = 0,                    \
}

extern void start_thread(struct pt_regs *regs, unsigned long pc,
                        unsigned long sp);

struct task_struct;

extern unsigned long __get_wchan(struct task_struct *p);

#define task_pt_regs(p) \
        ((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1)

/* Used by procfs */
#define KSTK_EIP(tsk)   ((tsk)->thread.kregs->ea)
#define KSTK_ESP(tsk)   ((tsk)->thread.kregs->sp)

#define cpu_relax()     barrier()

#endif /* __ASSEMBLER__ */

#endif /* _ASM_NIOS2_PROCESSOR_H */