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