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/types.h>
24
25#ifdef __KERNEL__
26#define STACK_TOP ((current->personality == PER_LINUX_32BIT) ? \
27 TASK_SIZE : TASK_SIZE_26)
28#define STACK_TOP_MAX TASK_SIZE
29#endif
30
31union debug_insn {
32 u32 arm;
33 u16 thumb;
34};
35
36struct debug_entry {
37 u32 address;
38 union debug_insn insn;
39};
40
41struct debug_info {
42 int nsaved;
43 struct debug_entry bp[2];
44};
45
46struct thread_struct {
47 /* fault info */
48 unsigned long address;
49 unsigned long trap_no;
50 unsigned long error_code;
51 /* debugging */
52 struct debug_info debug;
53};
54
55#define INIT_THREAD { }
56
57#ifdef CONFIG_MMU
58#define nommu_start_thread(regs) do { } while (0)
59#else
60#define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data
61#endif
62
63#define start_thread(regs,pc,sp) \
64({ \
65 unsigned long *stack = (unsigned long *)sp; \
66 set_fs(USER_DS); \
67 memzero(regs->uregs, sizeof(regs->uregs)); \
68 if (current->personality & ADDR_LIMIT_32BIT) \
69 regs->ARM_cpsr = USR_MODE; \
70 else \
71 regs->ARM_cpsr = USR26_MODE; \
72 if (elf_hwcap & HWCAP_THUMB && pc & 1) \
73 regs->ARM_cpsr |= PSR_T_BIT; \
74 regs->ARM_pc = pc & ~1; /* pc */ \
75 regs->ARM_sp = sp; /* sp */ \
76 regs->ARM_r2 = stack[2]; /* r2 (envp) */ \
77 regs->ARM_r1 = stack[1]; /* r1 (argv) */ \
78 regs->ARM_r0 = stack[0]; /* r0 (argc) */ \
79 nommu_start_thread(regs); \
80})
81
82/* Forward declaration, a strange C thing */
83struct task_struct;
84
85/* Free all resources held by a thread. */
86extern void release_thread(struct task_struct *);
87
88/* Prepare to copy thread state - unlazy all lazy status */
89#define prepare_to_copy(tsk) do { } while (0)
90
91unsigned long get_wchan(struct task_struct *p);
92
93#define cpu_relax() barrier()
94
95/*
96 * Create a new kernel thread
97 */
98extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
99
100#define task_pt_regs(p) \
101 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
102
103#define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc
104#define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp
105
106/*
107 * Prefetching support - only ARMv5.
108 */
109#if __LINUX_ARM_ARCH__ >= 5
110
111#define ARCH_HAS_PREFETCH
112static inline void prefetch(const void *ptr)
113{
114 __asm__ __volatile__(
115 "pld\t%0"
116 :
117 : "o" (*(char *)ptr)
118 : "cc");
119}
120
121#define ARCH_HAS_PREFETCHW
122#define prefetchw(ptr) prefetch(ptr)
123
124#define ARCH_HAS_SPINLOCK_PREFETCH
125#define spin_lock_prefetch(x) do { } while (0)
126
127#endif
128
129#endif
130
131#endif /* __ASM_ARM_PROCESSOR_H */