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
29typedef struct {
30	unsigned long seg;
31} mm_segment_t;
32
33/* This is dead.  Everything has been moved to thread_info.  */
34struct thread_struct { };
35#define INIT_THREAD  { }
36
37/* Do necessary setup to start up a newly executed thread.  */
38struct pt_regs;
39extern void start_thread(struct pt_regs *, unsigned long, unsigned long);
40
41/* Free all resources held by a thread. */
42struct task_struct;
43extern void release_thread(struct task_struct *);
44
45unsigned 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
63extern inline void prefetch(const void *ptr)
64{
65	__builtin_prefetch(ptr, 0, 3);
66}
67
68extern inline void prefetchw(const void *ptr)
69{
70	__builtin_prefetch(ptr, 1, 3);
71}
72
73#ifdef CONFIG_SMP
74extern 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