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/unified.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 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 nommu_start_thread(regs); \ 69 }) 70 71 /* Forward declaration, a strange C thing */ 72 struct task_struct; 73 74 /* Free all resources held by a thread. */ 75 extern void release_thread(struct task_struct *); 76 77 unsigned long get_wchan(struct task_struct *p); 78 79 #if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327) 80 #define cpu_relax() smp_mb() 81 #else 82 #define cpu_relax() barrier() 83 #endif 84 85 #define task_pt_regs(p) \ 86 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1) 87 88 #define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc 89 #define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp 90 91 #ifdef CONFIG_SMP 92 #define __ALT_SMP_ASM(smp, up) \ 93 "9998: " smp "\n" \ 94 " .pushsection \".alt.smp.init\", \"a\"\n" \ 95 " .long 9998b\n" \ 96 " " up "\n" \ 97 " .popsection\n" 98 #else 99 #define __ALT_SMP_ASM(smp, up) up 100 #endif 101 102 /* 103 * Prefetching support - only ARMv5. 104 */ 105 #if __LINUX_ARM_ARCH__ >= 5 106 107 #define ARCH_HAS_PREFETCH 108 static inline void prefetch(const void *ptr) 109 { 110 __asm__ __volatile__( 111 "pld\t%a0" 112 :: "p" (ptr)); 113 } 114 115 #if __LINUX_ARM_ARCH__ >= 7 && defined(CONFIG_SMP) 116 #define ARCH_HAS_PREFETCHW 117 static inline void prefetchw(const void *ptr) 118 { 119 __asm__ __volatile__( 120 ".arch_extension mp\n" 121 __ALT_SMP_ASM( 122 WASM(pldw) "\t%a0", 123 WASM(pld) "\t%a0" 124 ) 125 :: "p" (ptr)); 126 } 127 #endif 128 #endif 129 130 #define HAVE_ARCH_PICK_MMAP_LAYOUT 131 132 #endif 133 134 #endif /* __ASM_ARM_PROCESSOR_H */ 135