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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