1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * include/asm-alpha/processor.h 4 * 5 * Copyright (C) 1994 Linus Torvalds 6 */ 7 8#ifndef __ASM_ALPHA_PROCESSOR_H 9#define __ASM_ALPHA_PROCESSOR_H 10 11#include <linux/personality.h> /* for ADDR_LIMIT_32BIT */ 12 13/* 14 * We have a 42-bit user address space: 4TB user VM... 15 */ 16#define TASK_SIZE (0x40000000000UL) 17 18#define STACK_TOP \ 19 (current->personality & ADDR_LIMIT_32BIT ? 0x80000000 : 0x00120000000UL) 20 21#define STACK_TOP_MAX 0x00120000000UL 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/* Do necessary setup to start up a newly executed thread. */ 38struct pt_regs; 39extern void start_thread(struct pt_regs *, unsigned long, unsigned long); 40 41/* Free all resources held by a thread. */ 42struct task_struct; 43extern void release_thread(struct task_struct *); 44 45unsigned long get_wchan(struct task_struct *p); 46 47#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc) 48 49#define KSTK_ESP(tsk) \ 50 ((tsk) == current ? rdusp() : task_thread_info(tsk)->pcb.usp) 51 52#define cpu_relax() barrier() 53 54#define ARCH_HAS_PREFETCH 55#define ARCH_HAS_PREFETCHW 56#define ARCH_HAS_SPINLOCK_PREFETCH 57 58#ifndef CONFIG_SMP 59/* Nothing to prefetch. */ 60#define spin_lock_prefetch(lock) do { } while (0) 61#endif 62 63extern inline void prefetch(const void *ptr) 64{ 65 __builtin_prefetch(ptr, 0, 3); 66} 67 68extern inline void prefetchw(const void *ptr) 69{ 70 __builtin_prefetch(ptr, 1, 3); 71} 72 73#ifdef CONFIG_SMP 74extern inline void spin_lock_prefetch(const void *ptr) 75{ 76 __builtin_prefetch(ptr, 1, 3); 77} 78#endif 79 80#endif /* __ASM_ALPHA_PROCESSOR_H */ 81