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processor.h
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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 
34 typedef struct {
35  unsigned long seg;
36 } mm_segment_t;
37 
38 /* This is dead. Everything has been moved to thread_info. */
39 struct thread_struct { };
40 #define INIT_THREAD { }
41 
42 /* Return saved PC of a blocked thread. */
43 struct task_struct;
44 extern unsigned long thread_saved_pc(struct task_struct *);
45 
46 /* Do necessary setup to start up a newly executed thread. */
47 extern void start_thread(struct pt_regs *, unsigned long, unsigned long);
48 
49 /* Free all resources held by a thread. */
50 extern void release_thread(struct task_struct *);
51 
52 unsigned long get_wchan(struct task_struct *p);
53 
54 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
55 
56 #define KSTK_ESP(tsk) \
57  ((tsk) == current ? rdusp() : task_thread_info(tsk)->pcb.usp)
58 
59 #define cpu_relax() barrier()
60 
61 #define ARCH_HAS_PREFETCH
62 #define ARCH_HAS_PREFETCHW
63 #define ARCH_HAS_SPINLOCK_PREFETCH
64 
65 #ifndef CONFIG_SMP
66 /* Nothing to prefetch. */
67 #define spin_lock_prefetch(lock) do { } while (0)
68 #endif
69 
70 extern inline void prefetch(const void *ptr)
71 {
72  __builtin_prefetch(ptr, 0, 3);
73 }
74 
75 extern inline void prefetchw(const void *ptr)
76 {
77  __builtin_prefetch(ptr, 1, 3);
78 }
79 
80 #ifdef CONFIG_SMP
81 extern inline void spin_lock_prefetch(const void *ptr)
82 {
83  __builtin_prefetch(ptr, 1, 3);
84 }
85 #endif
86 
87 #endif /* __ASM_ALPHA_PROCESSOR_H */