1/* 2 * linux/include/asm-arm/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 25union debug_insn { 26 u32 arm; 27 u16 thumb; 28}; 29 30struct debug_entry { 31 u32 address; 32 union debug_insn insn; 33}; 34 35struct debug_info { 36 int nsaved; 37 struct debug_entry bp[2]; 38}; 39 40struct thread_struct { 41 /* fault info */ 42 unsigned long address; 43 unsigned long trap_no; 44 unsigned long error_code; 45 /* debugging */ 46 struct debug_info debug; 47}; 48 49#define INIT_THREAD { } 50 51#ifdef CONFIG_MMU 52#define nommu_start_thread(regs) do { } while (0) 53#else 54#define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data 55#endif 56 57#define start_thread(regs,pc,sp) \ 58({ \ 59 unsigned long *stack = (unsigned long *)sp; \ 60 set_fs(USER_DS); \ 61 memzero(regs->uregs, sizeof(regs->uregs)); \ 62 if (current->personality & ADDR_LIMIT_32BIT) \ 63 regs->ARM_cpsr = USR_MODE; \ 64 else \ 65 regs->ARM_cpsr = USR26_MODE; \ 66 if (elf_hwcap & HWCAP_THUMB && pc & 1) \ 67 regs->ARM_cpsr |= PSR_T_BIT; \ 68 regs->ARM_pc = pc & ~1; /* pc */ \ 69 regs->ARM_sp = sp; /* sp */ \ 70 regs->ARM_r2 = stack[2]; /* r2 (envp) */ \ 71 regs->ARM_r1 = stack[1]; /* r1 (argv) */ \ 72 regs->ARM_r0 = stack[0]; /* r0 (argc) */ \ 73 nommu_start_thread(regs); \ 74}) 75 76/* Forward declaration, a strange C thing */ 77struct task_struct; 78 79/* Free all resources held by a thread. */ 80extern void release_thread(struct task_struct *); 81 82/* Prepare to copy thread state - unlazy all lazy status */ 83#define prepare_to_copy(tsk) do { } while (0) 84 85unsigned long get_wchan(struct task_struct *p); 86 87#define cpu_relax() barrier() 88 89/* 90 * Create a new kernel thread 91 */ 92extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); 93 94#define task_pt_regs(p) \ 95 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1) 96 97#define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc 98#define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp 99 100/* 101 * Prefetching support - only ARMv5. 102 */ 103#if __LINUX_ARM_ARCH__ >= 5 104 105#define ARCH_HAS_PREFETCH 106static inline void prefetch(const void *ptr) 107{ 108 __asm__ __volatile__( 109 "pld\t%0" 110 : 111 : "o" (*(char *)ptr) 112 : "cc"); 113} 114 115#define ARCH_HAS_PREFETCHW 116#define prefetchw(ptr) prefetch(ptr) 117 118#define ARCH_HAS_SPINLOCK_PREFETCH 119#define spin_lock_prefetch(x) do { } while (0) 120 121#endif 122 123#endif 124 125#endif /* __ASM_ARM_PROCESSOR_H */ 126