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 * Returns current instruction pointer ("program counter"). 15 */ 16 #define current_text_addr() \ 17 ({ void *__pc; __asm__ ("br %0,.+4" : "=r"(__pc)); __pc; }) 18 19 /* 20 * We have a 42-bit user address space: 4TB user VM... 21 */ 22 #define TASK_SIZE (0x40000000000UL) 23 24 #define STACK_TOP \ 25 (current->personality & ADDR_LIMIT_32BIT ? 0x80000000 : 0x00120000000UL) 26 27 #define STACK_TOP_MAX 0x00120000000UL 28 29 /* This decides where the kernel will search for a free chunk of vm 30 * space during mmap's. 31 */ 32 #define TASK_UNMAPPED_BASE \ 33 ((current->personality & ADDR_LIMIT_32BIT) ? 0x40000000 : TASK_SIZE / 2) 34 35 typedef struct { 36 unsigned long seg; 37 } mm_segment_t; 38 39 /* This is dead. Everything has been moved to thread_info. */ 40 struct thread_struct { }; 41 #define INIT_THREAD { } 42 43 /* Do necessary setup to start up a newly executed thread. */ 44 struct pt_regs; 45 extern void start_thread(struct pt_regs *, unsigned long, unsigned long); 46 47 /* Free all resources held by a thread. */ 48 struct task_struct; 49 extern void release_thread(struct task_struct *); 50 51 unsigned long get_wchan(struct task_struct *p); 52 53 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc) 54 55 #define KSTK_ESP(tsk) \ 56 ((tsk) == current ? rdusp() : task_thread_info(tsk)->pcb.usp) 57 58 #define cpu_relax() barrier() 59 60 #define ARCH_HAS_PREFETCH 61 #define ARCH_HAS_PREFETCHW 62 #define ARCH_HAS_SPINLOCK_PREFETCH 63 64 #ifndef CONFIG_SMP 65 /* Nothing to prefetch. */ 66 #define spin_lock_prefetch(lock) do { } while (0) 67 #endif 68 69 extern inline void prefetch(const void *ptr) 70 { 71 __builtin_prefetch(ptr, 0, 3); 72 } 73 74 extern inline void prefetchw(const void *ptr) 75 { 76 __builtin_prefetch(ptr, 1, 3); 77 } 78 79 #ifdef CONFIG_SMP 80 extern inline void spin_lock_prefetch(const void *ptr) 81 { 82 __builtin_prefetch(ptr, 1, 3); 83 } 84 #endif 85 86 #endif /* __ASM_ALPHA_PROCESSOR_H */ 87