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/hw_breakpoint.h> 23#include <asm/ptrace.h> 24#include <asm/types.h> 25 26#ifdef __KERNEL__ 27#define STACK_TOP ((current->personality & ADDR_LIMIT_32BIT) ? \ 28 TASK_SIZE : TASK_SIZE_26) 29#define STACK_TOP_MAX TASK_SIZE 30#endif 31 32struct debug_info { 33#ifdef CONFIG_HAVE_HW_BREAKPOINT 34 struct perf_event *hbp[ARM_MAX_HBP_SLOTS]; 35#endif 36}; 37 38struct thread_struct { 39 /* fault info */ 40 unsigned long address; 41 unsigned long trap_no; 42 unsigned long error_code; 43 /* debugging */ 44 struct debug_info debug; 45}; 46 47#define INIT_THREAD { } 48 49#ifdef CONFIG_MMU 50#define nommu_start_thread(regs) do { } while (0) 51#else 52#define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data 53#endif 54 55#define start_thread(regs,pc,sp) \ 56({ \ 57 unsigned long *stack = (unsigned long *)sp; \ 58 memset(regs->uregs, 0, sizeof(regs->uregs)); \ 59 if (current->personality & ADDR_LIMIT_32BIT) \ 60 regs->ARM_cpsr = USR_MODE; \ 61 else \ 62 regs->ARM_cpsr = USR26_MODE; \ 63 if (elf_hwcap & HWCAP_THUMB && pc & 1) \ 64 regs->ARM_cpsr |= PSR_T_BIT; \ 65 regs->ARM_cpsr |= PSR_ENDSTATE; \ 66 regs->ARM_pc = pc & ~1; /* pc */ \ 67 regs->ARM_sp = sp; /* sp */ \ 68 regs->ARM_r2 = stack[2]; /* r2 (envp) */ \ 69 regs->ARM_r1 = stack[1]; /* r1 (argv) */ \ 70 regs->ARM_r0 = stack[0]; /* r0 (argc) */ \ 71 nommu_start_thread(regs); \ 72}) 73 74/* Forward declaration, a strange C thing */ 75struct task_struct; 76 77/* Free all resources held by a thread. */ 78extern void release_thread(struct task_struct *); 79 80/* Prepare to copy thread state - unlazy all lazy status */ 81#define prepare_to_copy(tsk) do { } while (0) 82 83unsigned long get_wchan(struct task_struct *p); 84 85#if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327) 86#define cpu_relax() smp_mb() 87#else 88#define cpu_relax() barrier() 89#endif 90 91void cpu_idle_wait(void); 92 93/* 94 * Create a new kernel thread 95 */ 96extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); 97 98#define task_pt_regs(p) \ 99 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1) 100 101#define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc 102#define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp 103 104/* 105 * Prefetching support - only ARMv5. 106 */ 107#if __LINUX_ARM_ARCH__ >= 5 108 109#define ARCH_HAS_PREFETCH 110static inline void prefetch(const void *ptr) 111{ 112 __asm__ __volatile__( 113 "pld\t%a0" 114 : 115 : "p" (ptr) 116 : "cc"); 117} 118 119#define ARCH_HAS_PREFETCHW 120#define prefetchw(ptr) prefetch(ptr) 121 122#define ARCH_HAS_SPINLOCK_PREFETCH 123#define spin_lock_prefetch(x) do { } while (0) 124 125#endif 126 127#define HAVE_ARCH_PICK_MMAP_LAYOUT 128 129#endif 130 131#endif /* __ASM_ARM_PROCESSOR_H */ 132