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

   1/*
   2 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
   3 * Copyright (C) 2008-2009 PetaLogix
   4 * Copyright (C) 2006 Atmark Techno, Inc.
   5 *
   6 * This file is subject to the terms and conditions of the GNU General Public
   7 * License. See the file "COPYING" in the main directory of this archive
   8 * for more details.
   9 */
  10
  11#ifndef _ASM_MICROBLAZE_PROCESSOR_H
  12#define _ASM_MICROBLAZE_PROCESSOR_H
  13
  14#include <asm/ptrace.h>
  15#include <asm/setup.h>
  16#include <asm/registers.h>
  17#include <asm/entry.h>
  18#include <asm/current.h>
  19
  20# ifndef __ASSEMBLY__
  21/* from kernel/cpu/mb.c */
  22extern const struct seq_operations cpuinfo_op;
  23
  24# define cpu_relax()            barrier()
  25
  26#define task_pt_regs(tsk) \
  27                (((struct pt_regs *)(THREAD_SIZE + task_stack_page(tsk))) - 1)
  28
  29/* Do necessary setup to start up a newly executed thread. */
  30void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp);
  31
  32extern void ret_from_fork(void);
  33extern void ret_from_kernel_thread(void);
  34
  35# endif /* __ASSEMBLY__ */
  36
  37# ifndef CONFIG_MMU
  38/*
  39 * User space process size: memory size
  40 *
  41 * TASK_SIZE on MMU cpu is usually 1GB. However, on no-MMU arch, both
  42 * user processes and the kernel is on the same memory region. They
  43 * both share the memory space and that is limited by the amount of
  44 * physical memory. thus, we set TASK_SIZE == amount of total memory.
  45 */
  46# define TASK_SIZE      (0x81000000 - 0x80000000)
  47
  48/*
  49 * This decides where the kernel will search for a free chunk of vm
  50 * space during mmap's. We won't be using it
  51 */
  52# define TASK_UNMAPPED_BASE     0
  53
  54/* definition in include/linux/sched.h */
  55struct task_struct;
  56
  57/* thread_struct is gone. use thread_info instead. */
  58struct thread_struct { };
  59# define INIT_THREAD    { }
  60
  61/* Free all resources held by a thread. */
  62static inline void release_thread(struct task_struct *dead_task)
  63{
  64}
  65
  66extern unsigned long get_wchan(struct task_struct *p);
  67
  68# define KSTK_EIP(tsk)  (0)
  69# define KSTK_ESP(tsk)  (0)
  70
  71# else /* CONFIG_MMU */
  72
  73/*
  74 * This is used to define STACK_TOP, and with MMU it must be below
  75 * kernel base to select the correct PGD when handling MMU exceptions.
  76 */
  77# define TASK_SIZE      (CONFIG_KERNEL_START)
  78
  79/*
  80 * This decides where the kernel will search for a free chunk of vm
  81 * space during mmap's.
  82 */
  83# define TASK_UNMAPPED_BASE     (TASK_SIZE / 8 * 3)
  84
  85# define THREAD_KSP     0
  86
  87#  ifndef __ASSEMBLY__
  88
  89/* If you change this, you must change the associated assembly-languages
  90 * constants defined below, THREAD_*.
  91 */
  92struct thread_struct {
  93        /* kernel stack pointer (must be first field in structure) */
  94        unsigned long   ksp;
  95        unsigned long   ksp_limit;      /* if ksp <= ksp_limit stack overflow */
  96        void            *pgdir;         /* root of page-table tree */
  97        struct pt_regs  *regs;          /* Pointer to saved register state */
  98};
  99
 100#  define INIT_THREAD { \
 101        .ksp   = sizeof init_stack + (unsigned long)init_stack, \
 102        .pgdir = swapper_pg_dir, \
 103}
 104
 105/* Free all resources held by a thread. */
 106static inline void release_thread(struct task_struct *dead_task)
 107{
 108}
 109
 110unsigned long get_wchan(struct task_struct *p);
 111
 112/* The size allocated for kernel stacks. This _must_ be a power of two! */
 113# define KERNEL_STACK_SIZE      0x2000
 114
 115/* Return some info about the user process TASK.  */
 116#  define task_tos(task)        ((unsigned long)(task) + KERNEL_STACK_SIZE)
 117#  define task_regs(task) ((struct pt_regs *)task_tos(task) - 1)
 118
 119#  define task_pt_regs_plus_args(tsk) \
 120        ((void *)task_pt_regs(tsk))
 121
 122#  define task_sp(task) (task_regs(task)->r1)
 123#  define task_pc(task) (task_regs(task)->pc)
 124/* Grotty old names for some.  */
 125#  define KSTK_EIP(task)        (task_pc(task))
 126#  define KSTK_ESP(task)        (task_sp(task))
 127
 128/* FIXME */
 129#  define deactivate_mm(tsk, mm)        do { } while (0)
 130
 131#  define STACK_TOP     TASK_SIZE
 132#  define STACK_TOP_MAX STACK_TOP
 133
 134#ifdef CONFIG_DEBUG_FS
 135extern struct dentry *of_debugfs_root;
 136#endif
 137
 138#  endif /* __ASSEMBLY__ */
 139# endif /* CONFIG_MMU */
 140#endif /* _ASM_MICROBLAZE_PROCESSOR_H */
 141