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 */
  22 extern 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. */
  30 void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp);
  31
  32 extern void ret_from_fork(void);
  33 extern 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 */
  61 struct task_struct;
  62
  63 /* thread_struct is gone. use thread_info instead. */
  64 struct thread_struct { };
  65 # define INIT_THREAD    { }
  66
  67 /* Free all resources held by a thread. */
  68 static inline void release_thread(struct task_struct *dead_task)
  69 {
  70 }
  71
  72 extern unsigned long get_wchan(struct task_struct *p);
  73
  74 # define KSTK_EIP(tsk)  (0)
  75 # define KSTK_ESP(tsk)  (0)
  76
  77 # else /* CONFIG_MMU */
  78
  79 /*
  80  * This is used to define STACK_TOP, and with MMU it must be below
  81  * kernel base to select the correct PGD when handling MMU exceptions.
  82  */
  83 # define TASK_SIZE      (CONFIG_KERNEL_START)
  84
  85 /*
  86  * This decides where the kernel will search for a free chunk of vm
  87  * space during mmap's.
  88  */
  89 # define TASK_UNMAPPED_BASE     (TASK_SIZE / 8 * 3)
  90
  91 # define THREAD_KSP     0
  92
  93 #  ifndef __ASSEMBLY__
  94
  95 /*
  96  * Default implementation of macro that returns current
  97  * instruction pointer ("program counter").
  98  */
  99 #  define current_text_addr()   ({ __label__ _l; _l: &&_l; })
 100
 101 /* If you change this, you must change the associated assembly-languages
 102  * constants defined below, THREAD_*.
 103  */
 104 struct thread_struct {
 105         /* kernel stack pointer (must be first field in structure) */
 106         unsigned long   ksp;
 107         unsigned long   ksp_limit;      /* if ksp <= ksp_limit stack overflow */
 108         void            *pgdir;         /* root of page-table tree */
 109         struct pt_regs  *regs;          /* Pointer to saved register state */
 110 };
 111
 112 #  define INIT_THREAD { \
 113         .ksp   = sizeof init_stack + (unsigned long)init_stack, \
 114         .pgdir = swapper_pg_dir, \
 115 }
 116
 117 /* Free all resources held by a thread. */
 118 static inline void release_thread(struct task_struct *dead_task)
 119 {
 120 }
 121
 122 unsigned long get_wchan(struct task_struct *p);
 123
 124 /* The size allocated for kernel stacks. This _must_ be a power of two! */
 125 # define KERNEL_STACK_SIZE      0x2000
 126
 127 /* Return some info about the user process TASK.  */
 128 #  define task_tos(task)        ((unsigned long)(task) + KERNEL_STACK_SIZE)
 129 #  define task_regs(task) ((struct pt_regs *)task_tos(task) - 1)
 130
 131 #  define task_pt_regs_plus_args(tsk) \
 132         ((void *)task_pt_regs(tsk))
 133
 134 #  define task_sp(task) (task_regs(task)->r1)
 135 #  define task_pc(task) (task_regs(task)->pc)
 136 /* Grotty old names for some.  */
 137 #  define KSTK_EIP(task)        (task_pc(task))
 138 #  define KSTK_ESP(task)        (task_sp(task))
 139
 140 /* FIXME */
 141 #  define deactivate_mm(tsk, mm)        do { } while (0)
 142
 143 #  define STACK_TOP     TASK_SIZE
 144 #  define STACK_TOP_MAX STACK_TOP
 145
 146 #ifdef CONFIG_DEBUG_FS
 147 extern struct dentry *of_debugfs_root;
 148 #endif
 149
 150 #  endif /* __ASSEMBLY__ */
 151 # endif /* CONFIG_MMU */
 152 #endif /* _ASM_MICROBLAZE_PROCESSOR_H */