arch/microblaze/include/asm/processor.h

   1 /*
   2  * Copyright (C) 2008 Michal Simek
   3  * Copyright (C) 2008 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/segment.h>
  18 #include <asm/entry.h>
  19 #include <asm/current.h>
  20
  21 # ifndef __ASSEMBLY__
  22 /* from kernel/cpu/mb.c */
  23 extern const struct seq_operations cpuinfo_op;
  24
  25 # define cpu_relax()            barrier()
  26 # define cpu_sleep()            do {} while (0)
  27 # define prepare_to_copy(tsk)   do {} while (0)
  28
  29 # endif /* __ASSEMBLY__ */
  30
  31 #define task_pt_regs(tsk) \
  32                 (((struct pt_regs *)(THREAD_SIZE + task_stack_page(tsk))) - 1)
  33
  34 /* Do necessary setup to start up a newly executed thread. */
  35 void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp);
  36
  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 #endif /* _ASM_MICROBLAZE_PROCESSOR_H */