1/*
2 * include/asm-alpha/processor.h
3 *
4 * Copyright (C) 1994 Linus Torvalds
5 */
6
7#ifndef __ASM_ALPHA_PROCESSOR_H
8#define __ASM_ALPHA_PROCESSOR_H
9
10#include <linux/personality.h>	/* for ADDR_LIMIT_32BIT */
11
12/*
13 * Returns current instruction pointer ("program counter").
14 */
15#define current_text_addr() \
16  ({ void *__pc; __asm__ ("br %0,.+4" : "=r"(__pc)); __pc; })
17
18/*
19 * We have a 42-bit user address space: 4TB user VM...
20 */
21#define TASK_SIZE (0x40000000000UL)
22
23#define STACK_TOP \
24  (current->personality & ADDR_LIMIT_32BIT ? 0x80000000 : 0x00120000000UL)
25
26#define STACK_TOP_MAX	0x00120000000UL
27
28/* This decides where the kernel will search for a free chunk of vm
29 * space during mmap's.
30 */
31#define TASK_UNMAPPED_BASE \
32  ((current->personality & ADDR_LIMIT_32BIT) ? 0x40000000 : TASK_SIZE / 2)
33
34typedef struct {
35	unsigned long seg;
36} mm_segment_t;
37
38/* This is dead.  Everything has been moved to thread_info.  */
39struct thread_struct { };
40#define INIT_THREAD  { }
41
42/* Return saved PC of a blocked thread.  */
43struct task_struct;
44extern unsigned long thread_saved_pc(struct task_struct *);
45
46/* Do necessary setup to start up a newly executed thread.  */
47struct pt_regs;
48extern void start_thread(struct pt_regs *, unsigned long, unsigned long);
49
50/* Free all resources held by a thread. */
51extern void release_thread(struct task_struct *);
52
53unsigned long get_wchan(struct task_struct *p);
54
55#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
56
57#define KSTK_ESP(tsk) \
58  ((tsk) == current ? rdusp() : task_thread_info(tsk)->pcb.usp)
59
60#define cpu_relax()	barrier()
61#define cpu_relax_lowlatency() cpu_relax()
62
63#define ARCH_HAS_PREFETCH
64#define ARCH_HAS_PREFETCHW
65#define ARCH_HAS_SPINLOCK_PREFETCH
66
67#ifndef CONFIG_SMP
68/* Nothing to prefetch. */
69#define spin_lock_prefetch(lock)  	do { } while (0)
70#endif
71
72extern inline void prefetch(const void *ptr)
73{
74	__builtin_prefetch(ptr, 0, 3);
75}
76
77extern inline void prefetchw(const void *ptr)
78{
79	__builtin_prefetch(ptr, 1, 3);
80}
81
82#ifdef CONFIG_SMP
83extern inline void spin_lock_prefetch(const void *ptr)
84{
85	__builtin_prefetch(ptr, 1, 3);
86}
87#endif
88
89#endif /* __ASM_ALPHA_PROCESSOR_H */
90