| 1 | |
| 2 | * linux/include/asm-arm/processor.h
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| 3 | *
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| 4 | * Copyright (C) 1995-1999 Russell King
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| 5 | *
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| 6 | * This program is free software; you can redistribute it and/or modify
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| 7 | * it under the terms of the GNU General Public License version 2 as
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| 8 | * published by the Free Software Foundation.
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| 9 |
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| 10 |
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| 11 | #ifndef __ASM_ARM_PROCESSOR_H
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| 12 | #define __ASM_ARM_PROCESSOR_H
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| 13 |
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| 14 | |
| 15 | * Default implementation of macro that returns current
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| 16 | * instruction pointer ("program counter").
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| 17 |
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| 18 | #define current_text_addr() ({ __label__ _l; _l: &&_l;})
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| 19 |
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| 20 | #ifdef __KERNEL__
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| 21 |
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| 22 | #include <asm/ptrace.h>
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| 23 | #include <asm/types.h>
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| 24 |
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| 25 | #ifdef __KERNEL__
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| 26 | #define STACK_TOP ((current->personality == PER_LINUX_32BIT) ? \
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| 27 | TASK_SIZE : TASK_SIZE_26)
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| 28 | #define STACK_TOP_MAX TASK_SIZE
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| 29 | #endif
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| 30 |
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| 31 | union debug_insn {
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| 32 | u32 arm;
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| 33 | u16 thumb;
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| 34 | };
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| 35 |
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| 36 | struct debug_entry {
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| 37 | u32 address;
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| 38 | union debug_insn insn;
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| 39 | };
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| 40 |
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| 41 | struct debug_info {
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| 42 | int nsaved;
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| 43 | struct debug_entry bp[2];
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| 44 | };
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| 45 |
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| 46 | struct thread_struct {
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| 47 |
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| 48 | unsigned long address;
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| 49 | unsigned long trap_no;
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| 50 | unsigned long error_code;
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| 51 |
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| 52 | struct debug_info debug;
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| 53 | };
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| 54 |
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| 55 | #define INIT_THREAD { }
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| 56 |
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| 57 | #ifdef CONFIG_MMU
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| 58 | #define nommu_start_thread(regs) do { } while (0)
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| 59 | #else
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| 60 | #define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data
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| 61 | #endif
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| 62 |
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| 63 | #define start_thread(regs,pc,sp) \
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| 64 | ({ \
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| 65 | unsigned long *stack = (unsigned long *)sp; \
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| 66 | set_fs(USER_DS); \
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| 67 | memzero(regs->uregs, sizeof(regs->uregs)); \
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| 68 | if (current->personality & ADDR_LIMIT_32BIT) \
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| 69 | regs->ARM_cpsr = USR_MODE; \
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| 70 | else \
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| 71 | regs->ARM_cpsr = USR26_MODE; \
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| 72 | if (elf_hwcap & HWCAP_THUMB && pc & 1) \
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| 73 | regs->ARM_cpsr |= PSR_T_BIT; \
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| 74 | regs->ARM_pc = pc & ~1; \
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| 75 | regs->ARM_sp = sp; \
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| 76 | regs->ARM_r2 = stack[2]; \
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| 77 | regs->ARM_r1 = stack[1]; \
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| 78 | regs->ARM_r0 = stack[0]; \
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| 79 | nommu_start_thread(regs); \
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| 80 | })
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| 81 |
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| 82 |
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| 83 | struct task_struct;
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| 84 |
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| 85 |
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| 86 | extern void release_thread(struct task_struct *);
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| 87 |
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| 88 |
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| 89 | #define prepare_to_copy(tsk) do { } while (0)
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| 90 |
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| 91 | unsigned long get_wchan(struct task_struct *p);
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| 92 |
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| 93 | #define cpu_relax() barrier()
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| 94 |
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| 95 | |
| 96 | * Create a new kernel thread
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| 97 |
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| 98 | extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
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| 99 |
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| 100 | #define task_pt_regs(p) \
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| 101 | ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
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| 102 |
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| 103 | #define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc
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| 104 | #define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp
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| 105 |
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| 106 | |
| 107 | * Prefetching support - only ARMv5.
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| 108 |
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| 109 | #if __LINUX_ARM_ARCH__ >= 5
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| 110 |
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| 111 | #define ARCH_HAS_PREFETCH
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| 112 | static inline void prefetch(const void *ptr)
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| 113 | {
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| 114 | __asm__ __volatile__(
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| 115 | "pld\t%0"
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| 116 | :
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| 117 | : "o" (*(char *)ptr)
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| 118 | : "cc");
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| 119 | }
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| 120 |
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| 121 | #define ARCH_HAS_PREFETCHW
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| 122 | #define prefetchw(ptr) prefetch(ptr)
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| 123 |
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| 124 | #define ARCH_HAS_SPINLOCK_PREFETCH
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| 125 | #define spin_lock_prefetch(x) do { } while (0)
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| 126 |
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| 127 | #endif
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| 128 |
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| 129 | #endif
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| 130 |
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| 131 | #endif
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