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/* 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/* Return saved PC of a blocked thread.  */
38struct task_struct;
39extern unsigned long thread_saved_pc(struct task_struct *);
40
41/* Do necessary setup to start up a newly executed thread.  */
42extern void start_thread(struct pt_regs *, unsigned long, unsigned long);
43
44/* Free all resources held by a thread. */
45extern void release_thread(struct task_struct *);
46
47/* Prepare to copy thread state - unlazy all lazy status */
48#define prepare_to_copy(tsk)	do { } while (0)
49
50/* Create a kernel thread without removing it from tasklists.  */
51extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
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
62#define ARCH_HAS_PREFETCH
63#define ARCH_HAS_PREFETCHW
64#define ARCH_HAS_SPINLOCK_PREFETCH
65
66#ifndef CONFIG_SMP
67/* Nothing to prefetch. */
68#define spin_lock_prefetch(lock)  	do { } while (0)
69#endif
70
71extern inline void prefetch(const void *ptr)
72{
73	__builtin_prefetch(ptr, 0, 3);
74}
75
76extern inline void prefetchw(const void *ptr)
77{
78	__builtin_prefetch(ptr, 1, 3);
79}
80
81#ifdef CONFIG_SMP
82extern inline void spin_lock_prefetch(const void *ptr)
83{
84	__builtin_prefetch(ptr, 1, 3);
85}
86#endif
87
88#endif /* __ASM_ALPHA_PROCESSOR_H */
89