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 #include <asm/system.h> 26 27 #ifdef __KERNEL__ 28 #define STACK_TOP ((current->personality & ADDR_LIMIT_32BIT) ? \ 29 TASK_SIZE : TASK_SIZE_26) 30 #define STACK_TOP_MAX TASK_SIZE 31 #endif 32 33 struct debug_info { 34 #ifdef CONFIG_HAVE_HW_BREAKPOINT 35 struct perf_event *hbp[ARM_MAX_HBP_SLOTS]; 36 #endif 37 }; 38 39 struct thread_struct { 40 /* fault info */ 41 unsigned long address; 42 unsigned long trap_no; 43 unsigned long error_code; 44 /* debugging */ 45 struct debug_info debug; 46 }; 47 48 #define INIT_THREAD { } 49 50 #ifdef CONFIG_MMU 51 #define nommu_start_thread(regs) do { } while (0) 52 #else 53 #define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data 54 #endif 55 56 #define start_thread(regs,pc,sp) \ 57 ({ \ 58 unsigned long *stack = (unsigned long *)sp; \ 59 set_fs(USER_DS); \ 60 memset(regs->uregs, 0, sizeof(regs->uregs)); \ 61 if (current->personality & ADDR_LIMIT_32BIT) \ 62 regs->ARM_cpsr = USR_MODE; \ 63 else \ 64 regs->ARM_cpsr = USR26_MODE; \ 65 if (elf_hwcap & HWCAP_THUMB && pc & 1) \ 66 regs->ARM_cpsr |= PSR_T_BIT; \ 67 regs->ARM_cpsr |= PSR_ENDSTATE; \ 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 */ 77 struct task_struct; 78 79 /* Free all resources held by a thread. */ 80 extern 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 85 unsigned long get_wchan(struct task_struct *p); 86 87 #if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327) 88 #define cpu_relax() smp_mb() 89 #else 90 #define cpu_relax() barrier() 91 #endif 92 93 /* 94 * Create a new kernel thread 95 */ 96 extern 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 110 static 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