LXR linux/arch/cris/include/asm/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/page.h>
  14#include <asm/ptrace.h>
  15#include <arch/processor.h>
  16#include <arch/system.h>
  17
  18struct task_struct;
  19
  20#define STACK_TOP       TASK_SIZE
  21#define STACK_TOP_MAX   STACK_TOP
  22
  23/* This decides where the kernel will search for a free chunk of vm
  24 * space during mmap's.
  25 */
  26#define TASK_UNMAPPED_BASE      (PAGE_ALIGN(TASK_SIZE / 3))
  27
  28/* THREAD_SIZE is the size of the thread_info/kernel_stack combo.
  29 * normally, the stack is found by doing something like p + THREAD_SIZE
  30 * in CRIS, a page is 8192 bytes, which seems like a sane size
  31 */
  32#define THREAD_SIZE       PAGE_SIZE
  33#define THREAD_SIZE_ORDER (0)
  34
  35/*
  36 * At user->kernel entry, the pt_regs struct is stacked on the top of the kernel-stack.
  37 * This macro allows us to find those regs for a task.
  38 * Notice that subsequent pt_regs stackings, like recursive interrupts occurring while
  39 * we're in the kernel, won't affect this - only the first user->kernel transition
  40 * registers are reached by this.
  41 */
  42
  43#define user_regs(thread_info) (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE)) - 1)
  44
  45/*
  46 * Dito but for the currently running task
  47 */
  48
  49#define task_pt_regs(task) user_regs(task_thread_info(task))
  50#define current_regs() task_pt_regs(current)
  51
  52extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
  53
  54unsigned long get_wchan(struct task_struct *p);
  55
  56#define KSTK_ESP(tsk)   ((tsk) == current ? rdusp() : (tsk)->thread.usp)
  57
  58extern unsigned long thread_saved_pc(struct task_struct *tsk);
  59
  60/* Free all resources held by a thread. */
  61static inline void release_thread(struct task_struct *dead_task)
  62{
  63        /* Nothing needs to be done.  */
  64}
  65
  66#define init_stack      (init_thread_union.stack)
  67
  68#define cpu_relax()     barrier()
  69
  70/*
  71 * disable hlt during certain critical i/o operations
  72 */
  73#define HAVE_DISABLE_HLT
  74void disable_hlt(void);
  75void enable_hlt(void);
  76
  77void default_idle(void);
  78
  79#endif /* __ASM_CRIS_PROCESSOR_H */
  80