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