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1da177e4 LT |
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 | ||
922a70d3 DH |
23 | #define STACK_TOP \ |
24 | (current->personality & ADDR_LIMIT_32BIT ? 0x80000000 : 0x00120000000UL) | |
25 | ||
26 | #define STACK_TOP_MAX 0x00120000000UL | |
27 | ||
1da177e4 LT |
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 | /* Prepare to copy thread state - unlazy all lazy status */ | |
53 | #define prepare_to_copy(tsk) do { } while (0) | |
54 | ||
55 | /* Create a kernel thread without removing it from tasklists. */ | |
56 | extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); | |
57 | ||
58 | unsigned long get_wchan(struct task_struct *p); | |
59 | ||
e52f4ca2 | 60 | #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc) |
1da177e4 LT |
61 | |
62 | #define KSTK_ESP(tsk) \ | |
37bfbaf9 | 63 | ((tsk) == current ? rdusp() : task_thread_info(tsk)->pcb.usp) |
1da177e4 LT |
64 | |
65 | #define cpu_relax() barrier() | |
66 | ||
67 | #define ARCH_HAS_PREFETCH | |
68 | #define ARCH_HAS_PREFETCHW | |
69 | #define ARCH_HAS_SPINLOCK_PREFETCH | |
70 | ||
71 | #ifndef CONFIG_SMP | |
72 | /* Nothing to prefetch. */ | |
73 | #define spin_lock_prefetch(lock) do { } while (0) | |
74 | #endif | |
75 | ||
1da177e4 LT |
76 | extern inline void prefetch(const void *ptr) |
77 | { | |
78 | __builtin_prefetch(ptr, 0, 3); | |
79 | } | |
80 | ||
81 | extern inline void prefetchw(const void *ptr) | |
82 | { | |
83 | __builtin_prefetch(ptr, 1, 3); | |
84 | } | |
85 | ||
86 | #ifdef CONFIG_SMP | |
87 | extern inline void spin_lock_prefetch(const void *ptr) | |
88 | { | |
89 | __builtin_prefetch(ptr, 1, 3); | |
90 | } | |
91 | #endif | |
92 | ||
1da177e4 | 93 | #endif /* __ASM_ALPHA_PROCESSOR_H */ |