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
  19 # ifndef __ASSEMBLY__
  20 /* from kernel/cpu/mb.c */
  21 extern const struct seq_operations cpuinfo_op;
  22
  23 # define cpu_relax()            barrier()
  24 # define cpu_sleep()            do {} while (0)
  25 # define prepare_to_copy(tsk)   do {} while (0)
  26
  27 # endif /* __ASSEMBLY__ */
  28
  29 #define task_pt_regs(tsk) \
  30                 (((struct pt_regs *)(THREAD_SIZE + task_stack_page(tsk))) - 1)
  31
  32 /* Do necessary setup to start up a newly executed thread. */
  33 void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp);
  34
  35 /*
  36  * User space process size: memory size
  37  *
  38  * TASK_SIZE on MMU cpu is usually 1GB. However, on no-MMU arch, both
  39  * user processes and the kernel is on the same memory region. They
  40  * both share the memory space and that is limited by the amount of
  41  * physical memory. thus, we set TASK_SIZE == amount of total memory.
  42  */
  43 # define TASK_SIZE      (0x81000000 - 0x80000000)
  44
  45 /*
  46  * Default implementation of macro that returns current
  47  * instruction pointer ("program counter").
  48  */
  49 # define current_text_addr() ({ __label__ _l; _l: &&_l; })
  50
  51 /*
  52  * This decides where the kernel will search for a free chunk of vm
  53  * space during mmap's. We won't be using it
  54  */
  55 # define TASK_UNMAPPED_BASE     0
  56
  57 /* definition in include/linux/sched.h */
  58 struct task_struct;
  59
  60 /* thread_struct is gone. use thread_info instead. */
  61 struct thread_struct { };
  62 # define INIT_THREAD    { }
  63
  64 /* Free all resources held by a thread. */
  65 static inline void release_thread(struct task_struct *dead_task)
  66 {
  67 }
  68
  69 /* Free all resources held by a thread. */
  70 static inline void exit_thread(void)
  71 {
  72 }
  73
  74 extern unsigned long thread_saved_pc(struct task_struct *t);
  75
  76 extern unsigned long get_wchan(struct task_struct *p);
  77
  78 /*
  79  * create a kernel thread without removing it from tasklists
  80  */
  81 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
  82
  83 # define KSTK_EIP(tsk)  (0)
  84 # define KSTK_ESP(tsk)  (0)
  85
  86 #endif /* _ASM_MICROBLAZE_PROCESSOR_H */