LXR linux/arch/alpha/include/asm/processor.h

   1/*
   2 * include/asm-alpha/processor.h
   3 *
   4 * Copyright (C) 1994 Linus Torvalds
   5 */
   6
   7#ifndef __ASM_ALPHA_PROCESSOR_H
   8#define __ASM_ALPHA_PROCESSOR_H
   9
  10#include <linux/personality.h>  /* for ADDR_LIMIT_32BIT */
  11
  12/*
  13 * Returns current instruction pointer ("program counter").
  14 */
  15#define current_text_addr() \
  16  ({ void *__pc; __asm__ ("br %0,.+4" : "=r"(__pc)); __pc; })
  17
  18/*
  19 * We have a 42-bit user address space: 4TB user VM...
  20 */
  21#define TASK_SIZE (0x40000000000UL)
  22
  23#define STACK_TOP \
  24  (current->personality & ADDR_LIMIT_32BIT ? 0x80000000 : 0x00120000000UL)
  25
  26#define STACK_TOP_MAX   0x00120000000UL
  27
  28/* This decides where the kernel will search for a free chunk of vm
  29 * space during mmap's.
  30 */
  31#define TASK_UNMAPPED_BASE \
  32  ((current->personality & ADDR_LIMIT_32BIT) ? 0x40000000 : TASK_SIZE / 2)
  33
  34typedef struct {
  35        unsigned long seg;
  36} mm_segment_t;
  37
  38/* This is dead.  Everything has been moved to thread_info.  */
  39struct thread_struct { };
  40#define INIT_THREAD  { }
  41
  42/* Return saved PC of a blocked thread.  */
  43struct task_struct;
  44extern unsigned long thread_saved_pc(struct task_struct *);
  45
  46/* Do necessary setup to start up a newly executed thread.  */
  47extern void start_thread(struct pt_regs *, unsigned long, unsigned long);
  48
  49/* Free all resources held by a thread. */
  50extern void release_thread(struct task_struct *);
  51
  52unsigned long get_wchan(struct task_struct *p);
  53
  54#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
  55
  56#define KSTK_ESP(tsk) \
  57  ((tsk) == current ? rdusp() : task_thread_info(tsk)->pcb.usp)
  58
  59#define cpu_relax()     barrier()
  60
  61#define ARCH_HAS_PREFETCH
  62#define ARCH_HAS_PREFETCHW
  63#define ARCH_HAS_SPINLOCK_PREFETCH
  64
  65#ifndef CONFIG_SMP
  66/* Nothing to prefetch. */
  67#define spin_lock_prefetch(lock)        do { } while (0)
  68#endif
  69
  70extern inline void prefetch(const void *ptr)  
  71{ 
  72        __builtin_prefetch(ptr, 0, 3);
  73}
  74
  75extern inline void prefetchw(const void *ptr)  
  76{
  77        __builtin_prefetch(ptr, 1, 3);
  78}
  79
  80#ifdef CONFIG_SMP
  81extern inline void spin_lock_prefetch(const void *ptr)  
  82{
  83        __builtin_prefetch(ptr, 1, 3);
  84}
  85#endif
  86
  87#endif /* __ASM_ALPHA_PROCESSOR_H */
  88