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Linux/arch/cris/include/asm/processor.h

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  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 
 18 struct 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 
 51 unsigned long get_wchan(struct task_struct *p);
 52 
 53 #define KSTK_ESP(tsk)   ((tsk) == current ? rdusp() : (tsk)->thread.usp)
 54 
 55 extern unsigned long thread_saved_pc(struct task_struct *tsk);
 56 
 57 /* Free all resources held by a thread. */
 58 static inline void release_thread(struct task_struct *dead_task)
 59 {
 60         /* Nothing needs to be done.  */
 61 }
 62 
 63 #define init_stack      (init_thread_union.stack)
 64 
 65 #define cpu_relax()     barrier()
 66 
 67 void default_idle(void);
 68 
 69 #endif /* __ASM_CRIS_PROCESSOR_H */
 70 

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