2 * include/asm-alpha/processor.h
4 * Copyright (C) 1994 Linus Torvalds
7 #ifndef __ASM_ALPHA_PROCESSOR_H
8 #define __ASM_ALPHA_PROCESSOR_H
10 #include <linux/personality.h> /* for ADDR_LIMIT_32BIT */
13 * Returns current instruction pointer ("program counter").
15 #define current_text_addr() \
16 ({ void *__pc; __asm__ ("br %0,.+4" : "=r"(__pc)); __pc; })
19 * We have a 42-bit user address space: 4TB user VM...
21 #define TASK_SIZE (0x40000000000UL)
24 (current->personality & ADDR_LIMIT_32BIT ? 0x80000000 : 0x00120000000UL)
26 #define STACK_TOP_MAX 0x00120000000UL
28 /* This decides where the kernel will search for a free chunk of vm
29 * space during mmap's.
31 #define TASK_UNMAPPED_BASE \
32 ((current->personality & ADDR_LIMIT_32BIT) ? 0x40000000 : TASK_SIZE / 2)
38 /* This is dead. Everything has been moved to thread_info. */
39 struct thread_struct { };
40 #define INIT_THREAD { }
42 /* Return saved PC of a blocked thread. */
44 extern unsigned long thread_saved_pc(struct task_struct *);
46 /* Do necessary setup to start up a newly executed thread. */
47 extern void start_thread(struct pt_regs *, unsigned long, unsigned long);
49 /* Free all resources held by a thread. */
50 extern void release_thread(struct task_struct *);
52 /* Prepare to copy thread state - unlazy all lazy status */
53 #define prepare_to_copy(tsk) do { } while (0)
55 /* Create a kernel thread without removing it from tasklists. */
56 extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
58 unsigned long get_wchan(struct task_struct *p);
60 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
62 #define KSTK_ESP(tsk) \
63 ((tsk) == current ? rdusp() : task_thread_info(tsk)->pcb.usp)
65 #define cpu_relax() barrier()
67 #define ARCH_HAS_PREFETCH
68 #define ARCH_HAS_PREFETCHW
69 #define ARCH_HAS_SPINLOCK_PREFETCH
72 /* Nothing to prefetch. */
73 #define spin_lock_prefetch(lock) do { } while (0)
76 extern inline void prefetch(const void *ptr)
78 __builtin_prefetch(ptr, 0, 3);
81 extern inline void prefetchw(const void *ptr)
83 __builtin_prefetch(ptr, 1, 3);
87 extern inline void spin_lock_prefetch(const void *ptr)
89 __builtin_prefetch(ptr, 1, 3);
93 #endif /* __ASM_ALPHA_PROCESSOR_H */