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
  18 struct 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
  50 static inline void prepare_to_copy(struct task_struct *tsk)
  51 {
  52 }
  53
  54 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
  55
  56 unsigned long get_wchan(struct task_struct *p);
  57
  58 #define KSTK_ESP(tsk)   ((tsk) == current ? rdusp() : (tsk)->thread.usp)
  59
  60 extern unsigned long thread_saved_pc(struct task_struct *tsk);
  61
  62 /* Free all resources held by a thread. */
  63 static 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 */