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Linux/arch/alpha/include/asm/processor.h

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  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 */
 81 

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