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 * Default implementation of macro that returns current
  50 * instruction pointer ("program counter").
  51 */
  52# define current_text_addr() ({ __label__ _l; _l: &&_l; })
  53
  54/*
  55 * This decides where the kernel will search for a free chunk of vm
  56 * space during mmap's. We won't be using it
  57 */
  58# define TASK_UNMAPPED_BASE     0
  59
  60/* definition in include/linux/sched.h */
  61struct task_struct;
  62
  63/* thread_struct is gone. use thread_info instead. */
  64struct thread_struct { };
  65# define INIT_THREAD    { }
  66
  67/* Free all resources held by a thread. */
  68static inline void release_thread(struct task_struct *dead_task)
  69{
  70}
  71
  72/* Free all resources held by a thread. */
  73static inline void exit_thread(void)
  74{
  75}
  76
  77extern unsigned long thread_saved_pc(struct task_struct *t);
  78
  79extern unsigned long get_wchan(struct task_struct *p);
  80
  81# define KSTK_EIP(tsk)  (0)
  82# define KSTK_ESP(tsk)  (0)
  83
  84# else /* CONFIG_MMU */
  85
  86/*
  87 * This is used to define STACK_TOP, and with MMU it must be below
  88 * kernel base to select the correct PGD when handling MMU exceptions.
  89 */
  90# define TASK_SIZE      (CONFIG_KERNEL_START)
  91
  92/*
  93 * This decides where the kernel will search for a free chunk of vm
  94 * space during mmap's.
  95 */
  96# define TASK_UNMAPPED_BASE     (TASK_SIZE / 8 * 3)
  97
  98# define THREAD_KSP     0
  99
 100#  ifndef __ASSEMBLY__
 101
 102/*
 103 * Default implementation of macro that returns current
 104 * instruction pointer ("program counter").
 105 */
 106#  define current_text_addr()   ({ __label__ _l; _l: &&_l; })
 107
 108/* If you change this, you must change the associated assembly-languages
 109 * constants defined below, THREAD_*.
 110 */
 111struct thread_struct {
 112        /* kernel stack pointer (must be first field in structure) */
 113        unsigned long   ksp;
 114        unsigned long   ksp_limit;      /* if ksp <= ksp_limit stack overflow */
 115        void            *pgdir;         /* root of page-table tree */
 116        struct pt_regs  *regs;          /* Pointer to saved register state */
 117};
 118
 119#  define INIT_THREAD { \
 120        .ksp   = sizeof init_stack + (unsigned long)init_stack, \
 121        .pgdir = swapper_pg_dir, \
 122}
 123
 124/* Free all resources held by a thread. */
 125extern inline void release_thread(struct task_struct *dead_task)
 126{
 127}
 128
 129/* Free current thread data structures etc.  */
 130static inline void exit_thread(void)
 131{
 132}
 133
 134/* Return saved (kernel) PC of a blocked thread.  */
 135#  define thread_saved_pc(tsk)  \
 136        ((tsk)->thread.regs ? (tsk)->thread.regs->r15 : 0)
 137
 138unsigned long get_wchan(struct task_struct *p);
 139
 140/* The size allocated for kernel stacks. This _must_ be a power of two! */
 141# define KERNEL_STACK_SIZE      0x2000
 142
 143/* Return some info about the user process TASK.  */
 144#  define task_tos(task)        ((unsigned long)(task) + KERNEL_STACK_SIZE)
 145#  define task_regs(task) ((struct pt_regs *)task_tos(task) - 1)
 146
 147#  define task_pt_regs_plus_args(tsk) \
 148        ((void *)task_pt_regs(tsk))
 149
 150#  define task_sp(task) (task_regs(task)->r1)
 151#  define task_pc(task) (task_regs(task)->pc)
 152/* Grotty old names for some.  */
 153#  define KSTK_EIP(task)        (task_pc(task))
 154#  define KSTK_ESP(task)        (task_sp(task))
 155
 156/* FIXME */
 157#  define deactivate_mm(tsk, mm)        do { } while (0)
 158
 159#  define STACK_TOP     TASK_SIZE
 160#  define STACK_TOP_MAX STACK_TOP
 161
 162#ifdef CONFIG_DEBUG_FS
 163extern struct dentry *of_debugfs_root;
 164#endif
 165
 166#  endif /* __ASSEMBLY__ */
 167# endif /* CONFIG_MMU */
 168#endif /* _ASM_MICROBLAZE_PROCESSOR_H */
 169