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  * We have a 42-bit user address space: 4TB user VM...
  15  */
  16 #define TASK_SIZE (0x40000000000UL)
  17
  18 #define STACK_TOP \
  19   (current->personality & ADDR_LIMIT_32BIT ? 0x80000000 : 0x00120000000UL)
  20
  21 #define STACK_TOP_MAX   0x00120000000UL
  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 /* Do necessary setup to start up a newly executed thread.  */
  38 struct pt_regs;
  39 extern void start_thread(struct pt_regs *, unsigned long, unsigned long);
  40
  41 /* Free all resources held by a thread. */
  42 struct task_struct;
  43 extern void release_thread(struct task_struct *);
  44
  45 unsigned long get_wchan(struct task_struct *p);
  46
  47 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
  48
  49 #define KSTK_ESP(tsk) \
  50   ((tsk) == current ? rdusp() : task_thread_info(tsk)->pcb.usp)
  51
  52 #define cpu_relax()     barrier()
  53
  54 #define ARCH_HAS_PREFETCH
  55 #define ARCH_HAS_PREFETCHW
  56 #define ARCH_HAS_SPINLOCK_PREFETCH
  57
  58 #ifndef CONFIG_SMP
  59 /* Nothing to prefetch. */
  60 #define spin_lock_prefetch(lock)        do { } while (0)
  61 #endif
  62
  63 extern inline void prefetch(const void *ptr)
  64 {
  65         __builtin_prefetch(ptr, 0, 3);
  66 }
  67
  68 extern inline void prefetchw(const void *ptr)
  69 {
  70         __builtin_prefetch(ptr, 1, 3);
  71 }
  72
  73 #ifdef CONFIG_SMP
  74 extern inline void spin_lock_prefetch(const void *ptr)
  75 {
  76         __builtin_prefetch(ptr, 1, 3);
  77 }
  78 #endif
  79
  80 #endif /* __ASM_ALPHA_PROCESSOR_H */