include/asm-alpha/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 /* This decides where the kernel will search for a free chunk of vm
  24  * space during mmap's.
  25  */
  26 #define TASK_UNMAPPED_BASE \
  27   ((current->personality & ADDR_LIMIT_32BIT) ? 0x40000000 : TASK_SIZE / 2)
  28
  29 typedef struct {
  30         unsigned long seg;
  31 } mm_segment_t;
  32
  33 /* This is dead.  Everything has been moved to thread_info.  */
  34 struct thread_struct { };
  35 #define INIT_THREAD  { }
  36
  37 /* Return saved PC of a blocked thread.  */
  38 struct task_struct;
  39 extern unsigned long thread_saved_pc(struct task_struct *);
  40
  41 /* Do necessary setup to start up a newly executed thread.  */
  42 extern void start_thread(struct pt_regs *, unsigned long, unsigned long);
  43
  44 /* Free all resources held by a thread. */
  45 extern void release_thread(struct task_struct *);
  46
  47 /* Prepare to copy thread state - unlazy all lazy status */
  48 #define prepare_to_copy(tsk)    do { } while (0)
  49
  50 /* Create a kernel thread without removing it from tasklists.  */
  51 extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
  52
  53 unsigned long get_wchan(struct task_struct *p);
  54
  55 /* See arch/alpha/kernel/ptrace.c for details.  */
  56 #define PT_REG(reg) \
  57   (PAGE_SIZE*2 - sizeof(struct pt_regs) + offsetof(struct pt_regs, reg))
  58
  59 #define SW_REG(reg) \
  60  (PAGE_SIZE*2 - sizeof(struct pt_regs) - sizeof(struct switch_stack) \
  61   + offsetof(struct switch_stack, reg))
  62
  63 #define KSTK_EIP(tsk) \
  64   (*(unsigned long *)(PT_REG(pc) + (unsigned long) ((tsk)->thread_info)))
  65
  66 #define KSTK_ESP(tsk) \
  67   ((tsk) == current ? rdusp() : (tsk)->thread_info->pcb.usp)
  68
  69 #define cpu_relax()     barrier()
  70
  71 #define ARCH_HAS_PREFETCH
  72 #define ARCH_HAS_PREFETCHW
  73 #define ARCH_HAS_SPINLOCK_PREFETCH
  74
  75 #ifndef CONFIG_SMP
  76 /* Nothing to prefetch. */
  77 #define spin_lock_prefetch(lock)        do { } while (0)
  78 #endif
  79
  80 #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)
  81 extern inline void prefetch(const void *ptr)
  82 {
  83         __builtin_prefetch(ptr, 0, 3);
  84 }
  85
  86 extern inline void prefetchw(const void *ptr)
  87 {
  88         __builtin_prefetch(ptr, 1, 3);
  89 }
  90
  91 #ifdef CONFIG_SMP
  92 extern inline void spin_lock_prefetch(const void *ptr)
  93 {
  94         __builtin_prefetch(ptr, 1, 3);
  95 }
  96 #endif
  97
  98 #else
  99 extern inline void prefetch(const void *ptr)
 100 {
 101         __asm__ ("ldl $31,%0" : : "m"(*(char *)ptr));
 102 }
 103
 104 extern inline void prefetchw(const void *ptr)
 105 {
 106         __asm__ ("ldq $31,%0" : : "m"(*(char *)ptr));
 107 }
 108
 109 #ifdef CONFIG_SMP
 110 extern inline void spin_lock_prefetch(const void *ptr)
 111 {
 112         __asm__ ("ldq $31,%0" : : "m"(*(char *)ptr));
 113 }
 114 #endif
 115
 116 #endif /* GCC 3.1 */
 117
 118 #endif /* __ASM_ALPHA_PROCESSOR_H */