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

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * include/asm-alpha/processor.h
   4 *
   5 * Copyright (C) 1994 Linus Torvalds
   6 */
   7
   8#ifndef __ASM_ALPHA_PROCESSOR_H
   9#define __ASM_ALPHA_PROCESSOR_H
  10
  11#include <linux/personality.h>  /* for ADDR_LIMIT_32BIT */
  12
  13/*
  14 * Returns current instruction pointer ("program counter").
  15 */
  16#define current_text_addr() \
  17  ({ void *__pc; __asm__ ("br %0,.+4" : "=r"(__pc)); __pc; })
  18
  19/*
  20 * We have a 42-bit user address space: 4TB user VM...
  21 */
  22#define TASK_SIZE (0x40000000000UL)
  23
  24#define STACK_TOP \
  25  (current->personality & ADDR_LIMIT_32BIT ? 0x80000000 : 0x00120000000UL)
  26
  27#define STACK_TOP_MAX   0x00120000000UL
  28
  29/* This decides where the kernel will search for a free chunk of vm
  30 * space during mmap's.
  31 */
  32#define TASK_UNMAPPED_BASE \
  33  ((current->personality & ADDR_LIMIT_32BIT) ? 0x40000000 : TASK_SIZE / 2)
  34
  35typedef struct {
  36        unsigned long seg;
  37} mm_segment_t;
  38
  39/* This is dead.  Everything has been moved to thread_info.  */
  40struct thread_struct { };
  41#define INIT_THREAD  { }
  42
  43/* Return saved PC of a blocked thread.  */
  44struct task_struct;
  45extern unsigned long thread_saved_pc(struct task_struct *);
  46
  47/* Do necessary setup to start up a newly executed thread.  */
  48struct pt_regs;
  49extern void start_thread(struct pt_regs *, unsigned long, unsigned long);
  50
  51/* Free all resources held by a thread. */
  52extern void release_thread(struct task_struct *);
  53
  54unsigned long get_wchan(struct task_struct *p);
  55
  56#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
  57
  58#define KSTK_ESP(tsk) \
  59  ((tsk) == current ? rdusp() : task_thread_info(tsk)->pcb.usp)
  60
  61#define cpu_relax()     barrier()
  62
  63#define ARCH_HAS_PREFETCH
  64#define ARCH_HAS_PREFETCHW
  65#define ARCH_HAS_SPINLOCK_PREFETCH
  66
  67#ifndef CONFIG_SMP
  68/* Nothing to prefetch. */
  69#define spin_lock_prefetch(lock)        do { } while (0)
  70#endif
  71
  72extern inline void prefetch(const void *ptr)  
  73{ 
  74        __builtin_prefetch(ptr, 0, 3);
  75}
  76
  77extern inline void prefetchw(const void *ptr)  
  78{
  79        __builtin_prefetch(ptr, 1, 3);
  80}
  81
  82#ifdef CONFIG_SMP
  83extern inline void spin_lock_prefetch(const void *ptr)  
  84{
  85        __builtin_prefetch(ptr, 1, 3);
  86}
  87#endif
  88
  89#endif /* __ASM_ALPHA_PROCESSOR_H */
  90