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 29 typedef struct { 30 unsigned long seg; 31 } mm_segment_t; 32 33 /* This is dead. Everything has been moved to thread_info. */ 34 struct thread_struct { }; 35 #define INIT_THREAD { } 36 37 /* Do necessary setup to start up a newly executed thread. */ 38 struct pt_regs; 39 extern void start_thread(struct pt_regs *, unsigned long, unsigned long); 40 41 /* Free all resources held by a thread. */ 42 struct task_struct; 43 extern void release_thread(struct task_struct *); 44 45 unsigned 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 63 extern inline void prefetch(const void *ptr) 64 { 65 __builtin_prefetch(ptr, 0, 3); 66 } 67 68 extern inline void prefetchw(const void *ptr) 69 { 70 __builtin_prefetch(ptr, 1, 3); 71 } 72 73 #ifdef CONFIG_SMP 74 extern 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