text: /*
   * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
   * Copyright (C) 2008-2009 PetaLogix
   * 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_PROCESSOR_H
  #define _ASM_MICROBLAZE_PROCESSOR_H
  
  #include <asm/ptrace.h>
  #include <asm/setup.h>
  #include <asm/registers.h>
  #include <asm/entry.h>
  #include <asm/current.h>
  
  # ifndef __ASSEMBLY__
  /* from kernel/cpu/mb.c */
  extern const struct seq_operations cpuinfo_op;
  
  # define cpu_relax()		barrier()
  
  #define task_pt_regs(tsk) \
  		(((struct pt_regs *)(THREAD_SIZE + task_stack_page(tsk))) - 1)
  
  /* Do necessary setup to start up a newly executed thread. */
  void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp);
  
  extern void ret_from_fork(void);
  extern void ret_from_kernel_thread(void);
  
  # endif /* __ASSEMBLY__ */
  
  # ifndef CONFIG_MMU
  /*
   * User space process size: memory size
   *
   * TASK_SIZE on MMU cpu is usually 1GB. However, on no-MMU arch, both
   * user processes and the kernel is on the same memory region. They
   * both share the memory space and that is limited by the amount of
   * physical memory. thus, we set TASK_SIZE == amount of total memory.
   */
  # define TASK_SIZE	(0x81000000 - 0x80000000)
  
  /*
   * This decides where the kernel will search for a free chunk of vm
   * space during mmap's. We won't be using it
   */
  # define TASK_UNMAPPED_BASE	0
  
  /* definition in include/linux/sched.h */
  struct task_struct;
  
  /* thread_struct is gone. use thread_info instead. */
  struct thread_struct { };
  # define INIT_THREAD	{ }
  
  /* Free all resources held by a thread. */
  static inline void release_thread(struct task_struct *dead_task)
  {
  }
  
  extern unsigned long get_wchan(struct task_struct *p);
  
  # define KSTK_EIP(tsk)	(0)
  # define KSTK_ESP(tsk)	(0)
  
  # else /* CONFIG_MMU */
  
  /*
   * This is used to define STACK_TOP, and with MMU it must be below
   * kernel base to select the correct PGD when handling MMU exceptions.
   */
  # define TASK_SIZE	(CONFIG_KERNEL_START)
  
  /*
   * This decides where the kernel will search for a free chunk of vm
   * space during mmap's.
   */
  # define TASK_UNMAPPED_BASE	(TASK_SIZE / 8 * 3)
  
  # define THREAD_KSP	0
  
  #  ifndef __ASSEMBLY__
  
  /* If you change this, you must change the associated assembly-languages
   * constants defined below, THREAD_*.
   */
  struct thread_struct {
  	/* kernel stack pointer (must be first field in structure) */
  	unsigned long	ksp;
  	unsigned long	ksp_limit;	/* if ksp <= ksp_limit stack overflow */
  	void		*pgdir;		/* root of page-table tree */
  	struct pt_regs	*regs;		/* Pointer to saved register state */
  };
  
  #  define INIT_THREAD { \
  	.ksp   = sizeof init_stack + (unsigned long)init_stack, \
  	.pgdir = swapper_pg_dir, \
  }
  
  /* Free all resources held by a thread. */
  static inline void release_thread(struct task_struct *dead_task)
  {
  }
  
  unsigned long get_wchan(struct task_struct *p);
  
  /* The size allocated for kernel stacks. This _must_ be a power of two! */
  # define KERNEL_STACK_SIZE	0x2000
  
  /* Return some info about the user process TASK.  */
  #  define task_tos(task)	((unsigned long)(task) + KERNEL_STACK_SIZE)
  #  define task_regs(task) ((struct pt_regs *)task_tos(task) - 1)
  
  #  define task_pt_regs_plus_args(tsk) \
  	((void *)task_pt_regs(tsk))
  
  #  define task_sp(task)	(task_regs(task)->r1)
  #  define task_pc(task)	(task_regs(task)->pc)
  /* Grotty old names for some.  */
  #  define KSTK_EIP(task)	(task_pc(task))
  #  define KSTK_ESP(task)	(task_sp(task))
  
  /* FIXME */
  #  define deactivate_mm(tsk, mm)	do { } while (0)
  
  #  define STACK_TOP	TASK_SIZE
  #  define STACK_TOP_MAX	STACK_TOP
  
  #ifdef CONFIG_DEBUG_FS
  extern struct dentry *of_debugfs_root;
  #endif
  
  #  endif /* __ASSEMBLY__ */
  # endif /* CONFIG_MMU */
  #endif /* _ASM_MICROBLAZE_PROCESSOR_H */
  