LXR linux/arch/nios2/include/asm/processor.h

   1/*
   2 * Copyright (C) 2013 Altera Corporation
   3 * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
   4 * Copyright (C) 2004 Microtronix Datacom Ltd
   5 * Copyright (C) 2001 Ken Hill (khill@microtronix.com)
   6 *                    Vic Phillips (vic@microtronix.com)
   7 *
   8 * based on SPARC asm/processor_32.h which is:
   9 *
  10 * Copyright (C) 1994 David S. Miller
  11 *
  12 * This file is subject to the terms and conditions of the GNU General Public
  13 * License.  See the file "COPYING" in the main directory of this archive
  14 * for more details.
  15 */
  16
  17#ifndef _ASM_NIOS2_PROCESSOR_H
  18#define _ASM_NIOS2_PROCESSOR_H
  19
  20#include <asm/ptrace.h>
  21#include <asm/registers.h>
  22#include <asm/page.h>
  23
  24#define NIOS2_FLAG_KTHREAD      0x00000001      /* task is a kernel thread */
  25
  26#define NIOS2_OP_NOP            0x1883a
  27#define NIOS2_OP_BREAK          0x3da03a
  28
  29#ifdef __KERNEL__
  30
  31#define STACK_TOP       TASK_SIZE
  32#define STACK_TOP_MAX   STACK_TOP
  33
  34#endif /* __KERNEL__ */
  35
  36/* Kuser helpers is mapped to this user space address */
  37#define KUSER_BASE              0x1000
  38#define KUSER_SIZE              (PAGE_SIZE)
  39#ifndef __ASSEMBLY__
  40
  41# define TASK_SIZE              0x7FFF0000UL
  42# define TASK_UNMAPPED_BASE     (PAGE_ALIGN(TASK_SIZE / 3))
  43
  44/* The Nios processor specific thread struct. */
  45struct thread_struct {
  46        struct pt_regs *kregs;
  47
  48        /* Context switch saved kernel state. */
  49        unsigned long ksp;
  50        unsigned long kpsr;
  51};
  52
  53#define INIT_MMAP \
  54        { &init_mm, (0), (0), __pgprot(0x0), VM_READ | VM_WRITE | VM_EXEC }
  55
  56# define INIT_THREAD {                  \
  57        .kregs  = NULL,                 \
  58        .ksp    = 0,                    \
  59        .kpsr   = 0,                    \
  60}
  61
  62extern void start_thread(struct pt_regs *regs, unsigned long pc,
  63                        unsigned long sp);
  64
  65struct task_struct;
  66
  67/* Free all resources held by a thread. */
  68static inline void release_thread(struct task_struct *dead_task)
  69{
  70}
  71
  72extern unsigned long get_wchan(struct task_struct *p);
  73
  74#define task_pt_regs(p) \
  75        ((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1)
  76
  77/* Used by procfs */
  78#define KSTK_EIP(tsk)   ((tsk)->thread.kregs->ea)
  79#define KSTK_ESP(tsk)   ((tsk)->thread.kregs->sp)
  80
  81#define cpu_relax()     barrier()
  82
  83#endif /* __ASSEMBLY__ */
  84
  85#endif /* _ASM_NIOS2_PROCESSOR_H */
  86