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# define cpu_relax_lowlatency() cpu_relax()
  26
  27#define task_pt_regs(tsk) \
  28                (((struct pt_regs *)(THREAD_SIZE + task_stack_page(tsk))) - 1)
  29
  30/* Do necessary setup to start up a newly executed thread. */
  31void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp);
  32
  33extern void ret_from_fork(void);
  34extern void ret_from_kernel_thread(void);
  35
  36# endif /* __ASSEMBLY__ */
  37
  38# ifndef CONFIG_MMU
  39/*
  40 * User space process size: memory size
  41 *
  42 * TASK_SIZE on MMU cpu is usually 1GB. However, on no-MMU arch, both
  43 * user processes and the kernel is on the same memory region. They
  44 * both share the memory space and that is limited by the amount of
  45 * physical memory. thus, we set TASK_SIZE == amount of total memory.
  46 */
  47# define TASK_SIZE      (0x81000000 - 0x80000000)
  48
  49/*
  50 * Default implementation of macro that returns current
  51 * instruction pointer ("program counter").
  52 */
  53# define current_text_addr() ({ __label__ _l; _l: &&_l; })
  54
  55/*
  56 * This decides where the kernel will search for a free chunk of vm
  57 * space during mmap's. We won't be using it
  58 */
  59# define TASK_UNMAPPED_BASE     0
  60
  61/* definition in include/linux/sched.h */
  62struct task_struct;
  63
  64/* thread_struct is gone. use thread_info instead. */
  65struct thread_struct { };
  66# define INIT_THREAD    { }
  67
  68/* Free all resources held by a thread. */
  69static inline void release_thread(struct task_struct *dead_task)
  70{
  71}
  72
  73/* Free all resources held by a thread. */
  74static inline void exit_thread(void)
  75{
  76}
  77
  78extern unsigned long thread_saved_pc(struct task_struct *t);
  79
  80extern unsigned long get_wchan(struct task_struct *p);
  81
  82# define KSTK_EIP(tsk)  (0)
  83# define KSTK_ESP(tsk)  (0)
  84
  85# else /* CONFIG_MMU */
  86
  87/*
  88 * This is used to define STACK_TOP, and with MMU it must be below
  89 * kernel base to select the correct PGD when handling MMU exceptions.
  90 */
  91# define TASK_SIZE      (CONFIG_KERNEL_START)
  92
  93/*
  94 * This decides where the kernel will search for a free chunk of vm
  95 * space during mmap's.
  96 */
  97# define TASK_UNMAPPED_BASE     (TASK_SIZE / 8 * 3)
  98
  99# define THREAD_KSP     0
 100
 101#  ifndef __ASSEMBLY__
 102
 103/*
 104 * Default implementation of macro that returns current
 105 * instruction pointer ("program counter").
 106 */
 107#  define current_text_addr()   ({ __label__ _l; _l: &&_l; })
 108
 109/* If you change this, you must change the associated assembly-languages
 110 * constants defined below, THREAD_*.
 111 */
 112struct thread_struct {
 113        /* kernel stack pointer (must be first field in structure) */
 114        unsigned long   ksp;
 115        unsigned long   ksp_limit;      /* if ksp <= ksp_limit stack overflow */
 116        void            *pgdir;         /* root of page-table tree */
 117        struct pt_regs  *regs;          /* Pointer to saved register state */
 118};
 119
 120#  define INIT_THREAD { \
 121        .ksp   = sizeof init_stack + (unsigned long)init_stack, \
 122        .pgdir = swapper_pg_dir, \
 123}
 124
 125/* Free all resources held by a thread. */
 126static inline void release_thread(struct task_struct *dead_task)
 127{
 128}
 129
 130/* Free current thread data structures etc.  */
 131static inline void exit_thread(void)
 132{
 133}
 134
 135/* Return saved (kernel) PC of a blocked thread.  */
 136#  define thread_saved_pc(tsk)  \
 137        ((tsk)->thread.regs ? (tsk)->thread.regs->r15 : 0)
 138
 139unsigned long get_wchan(struct task_struct *p);
 140
 141/* The size allocated for kernel stacks. This _must_ be a power of two! */
 142# define KERNEL_STACK_SIZE      0x2000
 143
 144/* Return some info about the user process TASK.  */
 145#  define task_tos(task)        ((unsigned long)(task) + KERNEL_STACK_SIZE)
 146#  define task_regs(task) ((struct pt_regs *)task_tos(task) - 1)
 147
 148#  define task_pt_regs_plus_args(tsk) \
 149        ((void *)task_pt_regs(tsk))
 150
 151#  define task_sp(task) (task_regs(task)->r1)
 152#  define task_pc(task) (task_regs(task)->pc)
 153/* Grotty old names for some.  */
 154#  define KSTK_EIP(task)        (task_pc(task))
 155#  define KSTK_ESP(task)        (task_sp(task))
 156
 157/* FIXME */
 158#  define deactivate_mm(tsk, mm)        do { } while (0)
 159
 160#  define STACK_TOP     TASK_SIZE
 161#  define STACK_TOP_MAX STACK_TOP
 162
 163#ifdef CONFIG_DEBUG_FS
 164extern struct dentry *of_debugfs_root;
 165#endif
 166
 167#  endif /* __ASSEMBLY__ */
 168# endif /* CONFIG_MMU */
 169#endif /* _ASM_MICROBLAZE_PROCESSOR_H */
 170