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/procinfo.h> 24 #include <asm/types.h> 25 26 union debug_insn { 27 u32 arm; 28 u16 thumb; 29 }; 30 31 struct debug_entry { 32 u32 address; 33 union debug_insn insn; 34 }; 35 36 struct debug_info { 37 int nsaved; 38 struct debug_entry bp[2]; 39 }; 40 41 struct thread_struct { 42 /* fault info */ 43 unsigned long address; 44 unsigned long trap_no; 45 unsigned long error_code; 46 /* debugging */ 47 struct debug_info debug; 48 }; 49 50 #define INIT_THREAD { } 51 52 #ifdef CONFIG_MMU 53 #define nommu_start_thread(regs) do { } while (0) 54 #else 55 #define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data 56 #endif 57 58 #define start_thread(regs,pc,sp) \ 59 ({ \ 60 unsigned long *stack = (unsigned long *)sp; \ 61 set_fs(USER_DS); \ 62 memzero(regs->uregs, sizeof(regs->uregs)); \ 63 if (current->personality & ADDR_LIMIT_32BIT) \ 64 regs->ARM_cpsr = USR_MODE; \ 65 else \ 66 regs->ARM_cpsr = USR26_MODE; \ 67 if (elf_hwcap & HWCAP_THUMB && pc & 1) \ 68 regs->ARM_cpsr |= PSR_T_BIT; \ 69 regs->ARM_pc = pc & ~1; /* pc */ \ 70 regs->ARM_sp = sp; /* sp */ \ 71 regs->ARM_r2 = stack[2]; /* r2 (envp) */ \ 72 regs->ARM_r1 = stack[1]; /* r1 (argv) */ \ 73 regs->ARM_r0 = stack[0]; /* r0 (argc) */ \ 74 nommu_start_thread(regs); \ 75 }) 76 77 /* Forward declaration, a strange C thing */ 78 struct task_struct; 79 80 /* Free all resources held by a thread. */ 81 extern void release_thread(struct task_struct *); 82 83 /* Prepare to copy thread state - unlazy all lazy status */ 84 #define prepare_to_copy(tsk) do { } while (0) 85 86 unsigned long get_wchan(struct task_struct *p); 87 88 #define cpu_relax() barrier() 89 90 /* 91 * Create a new kernel thread 92 */ 93 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); 94 95 #define task_pt_regs(p) \ 96 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1) 97 98 #define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc 99 #define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp 100 101 /* 102 * Prefetching support - only ARMv5. 103 */ 104 #if __LINUX_ARM_ARCH__ >= 5 105 106 #define ARCH_HAS_PREFETCH 107 #define prefetch(ptr) \ 108 ({ \ 109 __asm__ __volatile__( \ 110 "pld\t%0" \ 111 : \ 112 : "o" (*(char *)(ptr)) \ 113 : "cc"); \ 114 }) 115 116 #define ARCH_HAS_PREFETCHW 117 #define prefetchw(ptr) prefetch(ptr) 118 119 #define ARCH_HAS_SPINLOCK_PREFETCH 120 #define spin_lock_prefetch(x) do { } while (0) 121 122 #endif 123 124 #endif 125 126 #endif /* __ASM_ARM_PROCESSOR_H */ 127