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 /*
  30  * Bus types
  31  */
  32 #define EISA_bus 1
  33 #define MCA_bus 0
  34 #define MCA_bus__is_a_macro /* for versions in ksyms.c */
  35
  36 typedef struct {
  37         unsigned long seg;
  38 } mm_segment_t;
  39
  40 /* This is dead.  Everything has been moved to thread_info.  */
  41 struct thread_struct { };
  42 #define INIT_THREAD  { }
  43
  44 /* Return saved PC of a blocked thread.  */
  45 struct task_struct;
  46 extern unsigned long thread_saved_pc(struct task_struct *);
  47
  48 /* Do necessary setup to start up a newly executed thread.  */
  49 extern void start_thread(struct pt_regs *, unsigned long, unsigned long);
  50
  51 /* Free all resources held by a thread. */
  52 extern void release_thread(struct task_struct *);
  53
  54 /* Prepare to copy thread state - unlazy all lazy status */
  55 #define prepare_to_copy(tsk)    do { } while (0)
  56
  57 /* Create a kernel thread without removing it from tasklists.  */
  58 extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
  59
  60 unsigned long get_wchan(struct task_struct *p);
  61
  62 /* See arch/alpha/kernel/ptrace.c for details.  */
  63 #define PT_REG(reg) \
  64   (PAGE_SIZE*2 - sizeof(struct pt_regs) + offsetof(struct pt_regs, reg))
  65
  66 #define SW_REG(reg) \
  67  (PAGE_SIZE*2 - sizeof(struct pt_regs) - sizeof(struct switch_stack) \
  68   + offsetof(struct switch_stack, reg))
  69
  70 #define KSTK_EIP(tsk) \
  71   (*(unsigned long *)(PT_REG(pc) + (unsigned long) ((tsk)->thread_info)))
  72
  73 #define KSTK_ESP(tsk) \
  74   ((tsk) == current ? rdusp() : (tsk)->thread_info->pcb.usp)
  75
  76 #define cpu_relax()     barrier()
  77
  78 #define ARCH_HAS_PREFETCH
  79 #define ARCH_HAS_PREFETCHW
  80 #define ARCH_HAS_SPINLOCK_PREFETCH
  81
  82 #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)
  83 extern inline void prefetch(const void *ptr)
  84 {
  85         __builtin_prefetch(ptr, 0, 3);
  86 }
  87
  88 extern inline void prefetchw(const void *ptr)
  89 {
  90         __builtin_prefetch(ptr, 1, 3);
  91 }
  92
  93 extern inline void spin_lock_prefetch(const void *ptr)
  94 {
  95         __builtin_prefetch(ptr, 1, 3);
  96 }
  97 #else
  98 extern inline void prefetch(const void *ptr)
  99 {
 100         __asm__ ("ldl $31,%0" : : "m"(*(char *)ptr));
 101 }
 102
 103 extern inline void prefetchw(const void *ptr)
 104 {
 105         __asm__ ("ldq $31,%0" : : "m"(*(char *)ptr));
 106 }
 107
 108 extern inline void spin_lock_prefetch(const void *ptr)
 109 {
 110         __asm__ ("ldq $31,%0" : : "m"(*(char *)ptr));
 111 }
 112 #endif /* GCC 3.1 */
 113
 114 #endif /* __ASM_ALPHA_PROCESSOR_H */