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. */ 47extern void start_thread(struct pt_regs *, unsigned long, unsigned long); 48 49/* Free all resources held by a thread. */ 50extern void release_thread(struct task_struct *); 51 52unsigned 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#define cpu_relax_lowlatency() cpu_relax() 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