xref: /linux/arch/alpha/include/asm/processor.h (revision 8b0582f50952a0e225fabd97bb6f90ca5138a0e7)
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 /*
12  * We have a 42-bit user address space: 4TB user VM...
13  */
14 #define TASK_SIZE (0x40000000000UL)
15 
16 #define STACK_TOP (0x00120000000UL)
17 
18 #define STACK_TOP_MAX	0x00120000000UL
19 
20 /* This decides where the kernel will search for a free chunk of vm
21  * space during mmap's.
22  */
23 #define TASK_UNMAPPED_BASE (TASK_SIZE / 2)
24 
25 /* This is dead.  Everything has been moved to thread_info.  */
26 struct thread_struct { };
27 #define INIT_THREAD  { }
28 
29 /* Do necessary setup to start up a newly executed thread.  */
30 struct pt_regs;
31 extern void start_thread(struct pt_regs *, unsigned long, unsigned long);
32 
33 /* Free all resources held by a thread. */
34 struct task_struct;
35 unsigned long __get_wchan(struct task_struct *p);
36 
37 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
38 
39 #define KSTK_ESP(tsk) \
40   ((tsk) == current ? rdusp() : task_thread_info(tsk)->pcb.usp)
41 
42 #define cpu_relax()	barrier()
43 
44 #define ARCH_HAS_PREFETCH
45 #define ARCH_HAS_PREFETCHW
46 
prefetch(const void * ptr)47 extern inline void prefetch(const void *ptr)
48 {
49 	__builtin_prefetch(ptr, 0, 3);
50 }
51 
prefetchw(const void * ptr)52 extern inline void prefetchw(const void *ptr)
53 {
54 	__builtin_prefetch(ptr, 1, 3);
55 }
56 
57 #endif /* __ASM_ALPHA_PROCESSOR_H */
58