1/* 2 * arch/arm/include/asm/processor.h 3 * 4 * Copyright (C) 1995-1999 Russell King 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 11#ifndef __ASM_ARM_PROCESSOR_H 12#define __ASM_ARM_PROCESSOR_H 13 14/* 15 * Default implementation of macro that returns current 16 * instruction pointer ("program counter"). 17 */ 18#define current_text_addr() ({ __label__ _l; _l: &&_l;}) 19 20#ifdef __KERNEL__ 21 22#include <asm/ptrace.h> 23#include <asm/types.h> 24 25#ifdef __KERNEL__ 26#define STACK_TOP ((current->personality & ADDR_LIMIT_32BIT) ? \ 27 TASK_SIZE : TASK_SIZE_26) 28#define STACK_TOP_MAX TASK_SIZE 29#endif 30 31union debug_insn { 32 u32 arm; 33 u16 thumb; 34}; 35 36struct debug_entry { 37 u32 address; 38 union debug_insn insn; 39}; 40 41struct debug_info { 42 int nsaved; 43 struct debug_entry bp[2]; 44}; 45 46struct thread_struct { 47 /* fault info */ 48 unsigned long address; 49 unsigned long trap_no; 50 unsigned long error_code; 51 /* debugging */ 52 struct debug_info debug; 53}; 54 55#define INIT_THREAD { } 56 57#ifdef CONFIG_MMU 58#define nommu_start_thread(regs) do { } while (0) 59#else 60#define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data 61#endif 62 63#define start_thread(regs,pc,sp) \ 64({ \ 65 unsigned long *stack = (unsigned long *)sp; \ 66 set_fs(USER_DS); \ 67 memset(regs->uregs, 0, sizeof(regs->uregs)); \ 68 if (current->personality & ADDR_LIMIT_32BIT) \ 69 regs->ARM_cpsr = USR_MODE; \ 70 else \ 71 regs->ARM_cpsr = USR26_MODE; \ 72 if (elf_hwcap & HWCAP_THUMB && pc & 1) \ 73 regs->ARM_cpsr |= PSR_T_BIT; \ 74 regs->ARM_cpsr |= PSR_ENDSTATE; \ 75 regs->ARM_pc = pc & ~1; /* pc */ \ 76 regs->ARM_sp = sp; /* sp */ \ 77 regs->ARM_r2 = stack[2]; /* r2 (envp) */ \ 78 regs->ARM_r1 = stack[1]; /* r1 (argv) */ \ 79 regs->ARM_r0 = stack[0]; /* r0 (argc) */ \ 80 nommu_start_thread(regs); \ 81}) 82 83/* Forward declaration, a strange C thing */ 84struct task_struct; 85 86/* Free all resources held by a thread. */ 87extern void release_thread(struct task_struct *); 88 89/* Prepare to copy thread state - unlazy all lazy status */ 90#define prepare_to_copy(tsk) do { } while (0) 91 92unsigned long get_wchan(struct task_struct *p); 93 94#if __LINUX_ARM_ARCH__ == 6 95#define cpu_relax() smp_mb() 96#else 97#define cpu_relax() barrier() 98#endif 99 100/* 101 * Create a new kernel thread 102 */ 103extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); 104 105#define task_pt_regs(p) \ 106 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1) 107 108#define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc 109#define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp 110 111/* 112 * Prefetching support - only ARMv5. 113 */ 114#if __LINUX_ARM_ARCH__ >= 5 115 116#define ARCH_HAS_PREFETCH 117static inline void prefetch(const void *ptr) 118{ 119 __asm__ __volatile__( 120 "pld\t%a0" 121 : 122 : "p" (ptr) 123 : "cc"); 124} 125 126#define ARCH_HAS_PREFETCHW 127#define prefetchw(ptr) prefetch(ptr) 128 129#define ARCH_HAS_SPINLOCK_PREFETCH 130#define spin_lock_prefetch(x) do { } while (0) 131 132#endif 133 134#endif 135 136#endif /* __ASM_ARM_PROCESSOR_H */ 137