include/asm-cris/processor.h

   1 /*
   2  * include/asm-cris/processor.h
   3  *
   4  * Copyright (C) 2000, 2001 Axis Communications AB
   5  *
   6  * Authors:         Bjorn Wesen        Initial version
   7  *
   8  */
   9
  10 #ifndef __ASM_CRIS_PROCESSOR_H
  11 #define __ASM_CRIS_PROCESSOR_H
  12
  13 #include <linux/config.h>
  14 #include <asm/system.h>
  15 #include <asm/page.h>
  16 #include <asm/ptrace.h>
  17 #include <asm/arch/processor.h>
  18
  19 /* This decides where the kernel will search for a free chunk of vm
  20  * space during mmap's.
  21  */
  22 #define TASK_UNMAPPED_BASE      (PAGE_ALIGN(TASK_SIZE / 3))
  23
  24 /* THREAD_SIZE is the size of the task_struct/kernel_stack combo.
  25  * normally, the stack is found by doing something like p + THREAD_SIZE
  26  * in CRIS, a page is 8192 bytes, which seems like a sane size
  27  */
  28
  29 #define THREAD_SIZE       PAGE_SIZE
  30 #define KERNEL_STACK_SIZE PAGE_SIZE
  31
  32 /*
  33  * At user->kernel entry, the pt_regs struct is stacked on the top of the kernel-stack.
  34  * This macro allows us to find those regs for a task.
  35  * Notice that subsequent pt_regs stackings, like recursive interrupts occurring while
  36  * we're in the kernel, won't affect this - only the first user->kernel transition
  37  * registers are reached by this.
  38  */
  39
  40 #define user_regs(thread_info) (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE)) - 1)
  41
  42 /*
  43  * Dito but for the currently running task
  44  */
  45
  46 #define current_regs() user_regs(current->thread_info)
  47
  48 extern inline void prepare_to_copy(struct task_struct *tsk)
  49 {
  50 }
  51
  52 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
  53
  54 unsigned long get_wchan(struct task_struct *p);
  55
  56 #define KSTK_ESP(tsk)   ((tsk) == current ? rdusp() : (tsk)->thread.usp)
  57
  58 /*
  59  * Free current thread data structures etc..
  60  */
  61
  62 extern inline void exit_thread(void)
  63 {
  64         /* Nothing needs to be done.  */
  65 }
  66
  67 extern unsigned long thread_saved_pc(struct task_struct *tsk);
  68
  69 /* Free all resources held by a thread. */
  70 extern inline void release_thread(struct task_struct *dead_task)
  71 {
  72         /* Nothing needs to be done.  */
  73 }
  74
  75 #define init_stack      (init_thread_union.stack)
  76
  77 #define cpu_relax()     barrier()
  78
  79 #endif /* __ASM_CRIS_PROCESSOR_H */