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
  34 typedef struct {
  35         unsigned long seg;
  36 } mm_segment_t;
  37
  38 /* This is dead.  Everything has been moved to thread_info.  */
  39 struct thread_struct { };
  40 #define INIT_THREAD  { }
  41
  42 /* Return saved PC of a blocked thread.  */
  43 struct task_struct;
  44 extern unsigned long thread_saved_pc(struct task_struct *);
  45
  46 /* Do necessary setup to start up a newly executed thread.  */
  47 struct pt_regs;
  48 extern void start_thread(struct pt_regs *, unsigned long, unsigned long);
  49
  50 /* Free all resources held by a thread. */
  51 extern void release_thread(struct task_struct *);
  52
  53 unsigned long get_wchan(struct task_struct *p);
  54
  55 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
  56
  57 #define KSTK_ESP(tsk) \
  58   ((tsk) == current ? rdusp() : task_thread_info(tsk)->pcb.usp)
  59
  60 #define cpu_relax()     barrier()
  61
  62 #define ARCH_HAS_PREFETCH
  63 #define ARCH_HAS_PREFETCHW
  64 #define ARCH_HAS_SPINLOCK_PREFETCH
  65
  66 #ifndef CONFIG_SMP
  67 /* Nothing to prefetch. */
  68 #define spin_lock_prefetch(lock)        do { } while (0)
  69 #endif
  70
  71 extern inline void prefetch(const void *ptr)
  72 {
  73         __builtin_prefetch(ptr, 0, 3);
  74 }
  75
  76 extern inline void prefetchw(const void *ptr)
  77 {
  78         __builtin_prefetch(ptr, 1, 3);
  79 }
  80
  81 #ifdef CONFIG_SMP
  82 extern inline void spin_lock_prefetch(const void *ptr)
  83 {
  84         __builtin_prefetch(ptr, 1, 3);
  85 }
  86 #endif
  87
  88 #endif /* __ASM_ALPHA_PROCESSOR_H */