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