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 # define cpu_sleep()            do {} while (0)
  26 # define prepare_to_copy(tsk)   do {} while (0)
  27
  28 #define task_pt_regs(tsk) \
  29                 (((struct pt_regs *)(THREAD_SIZE + task_stack_page(tsk))) - 1)
  30
  31 /* Do necessary setup to start up a newly executed thread. */
  32 void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp);
  33
  34 # endif /* __ASSEMBLY__ */
  35
  36 # ifndef CONFIG_MMU
  37 /*
  38  * User space process size: memory size
  39  *
  40  * TASK_SIZE on MMU cpu is usually 1GB. However, on no-MMU arch, both
  41  * user processes and the kernel is on the same memory region. They
  42  * both share the memory space and that is limited by the amount of
  43  * physical memory. thus, we set TASK_SIZE == amount of total memory.
  44  */
  45 # define TASK_SIZE      (0x81000000 - 0x80000000)
  46
  47 /*
  48  * Default implementation of macro that returns current
  49  * instruction pointer ("program counter").
  50  */
  51 # define current_text_addr() ({ __label__ _l; _l: &&_l; })
  52
  53 /*
  54  * This decides where the kernel will search for a free chunk of vm
  55  * space during mmap's. We won't be using it
  56  */
  57 # define TASK_UNMAPPED_BASE     0
  58
  59 /* definition in include/linux/sched.h */
  60 struct task_struct;
  61
  62 /* thread_struct is gone. use thread_info instead. */
  63 struct thread_struct { };
  64 # define INIT_THREAD    { }
  65
  66 /* Free all resources held by a thread. */
  67 static inline void release_thread(struct task_struct *dead_task)
  68 {
  69 }
  70
  71 /* Free all resources held by a thread. */
  72 static inline void exit_thread(void)
  73 {
  74 }
  75
  76 extern unsigned long thread_saved_pc(struct task_struct *t);
  77
  78 extern unsigned long get_wchan(struct task_struct *p);
  79
  80 /*
  81  * create a kernel thread without removing it from tasklists
  82  */
  83 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
  84
  85 # define KSTK_EIP(tsk)  (0)
  86 # define KSTK_ESP(tsk)  (0)
  87
  88 # else /* CONFIG_MMU */
  89
  90 /*
  91  * This is used to define STACK_TOP, and with MMU it must be below
  92  * kernel base to select the correct PGD when handling MMU exceptions.
  93  */
  94 # define TASK_SIZE      (CONFIG_KERNEL_START)
  95
  96 /*
  97  * This decides where the kernel will search for a free chunk of vm
  98  * space during mmap's.
  99  */
 100 # define TASK_UNMAPPED_BASE     (TASK_SIZE / 8 * 3)
 101
 102 # define THREAD_KSP     0
 103
 104 #  ifndef __ASSEMBLY__
 105
 106 /*
 107  * Default implementation of macro that returns current
 108  * instruction pointer ("program counter").
 109  */
 110 #  define current_text_addr()   ({ __label__ _l; _l: &&_l; })
 111
 112 /* If you change this, you must change the associated assembly-languages
 113  * constants defined below, THREAD_*.
 114  */
 115 struct thread_struct {
 116         /* kernel stack pointer (must be first field in structure) */
 117         unsigned long   ksp;
 118         unsigned long   ksp_limit;      /* if ksp <= ksp_limit stack overflow */
 119         void            *pgdir;         /* root of page-table tree */
 120         struct pt_regs  *regs;          /* Pointer to saved register state */
 121 };
 122
 123 #  define INIT_THREAD { \
 124         .ksp   = sizeof init_stack + (unsigned long)init_stack, \
 125         .pgdir = swapper_pg_dir, \
 126 }
 127
 128
 129 /* Free all resources held by a thread. */
 130 extern inline void release_thread(struct task_struct *dead_task)
 131 {
 132 }
 133
 134 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
 135
 136 /* Free current thread data structures etc.  */
 137 static inline void exit_thread(void)
 138 {
 139 }
 140
 141 /* Return saved (kernel) PC of a blocked thread.  */
 142 #  define thread_saved_pc(tsk)  \
 143         ((tsk)->thread.regs ? (tsk)->thread.regs->r15 : 0)
 144
 145 unsigned long get_wchan(struct task_struct *p);
 146
 147 /* The size allocated for kernel stacks. This _must_ be a power of two! */
 148 # define KERNEL_STACK_SIZE      0x2000
 149
 150 /* Return some info about the user process TASK.  */
 151 #  define task_tos(task)        ((unsigned long)(task) + KERNEL_STACK_SIZE)
 152 #  define task_regs(task) ((struct pt_regs *)task_tos(task) - 1)
 153
 154 #  define task_pt_regs_plus_args(tsk) \
 155         ((void *)task_pt_regs(tsk))
 156
 157 #  define task_sp(task) (task_regs(task)->r1)
 158 #  define task_pc(task) (task_regs(task)->pc)
 159 /* Grotty old names for some.  */
 160 #  define KSTK_EIP(task)        (task_pc(task))
 161 #  define KSTK_ESP(task)        (task_sp(task))
 162
 163 /* FIXME */
 164 #  define deactivate_mm(tsk, mm)        do { } while (0)
 165
 166 #  define STACK_TOP     TASK_SIZE
 167 #  define STACK_TOP_MAX STACK_TOP
 168
 169 #  endif /* __ASSEMBLY__ */
 170 # endif /* CONFIG_MMU */
 171 #endif /* _ASM_MICROBLAZE_PROCESSOR_H */