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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Russell King4baa9922008-08-02 10:55:55 +01002 * arch/arm/include/asm/processor.h
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <asm/types.h>
24
David Howells922a70d2008-02-08 04:19:26 -080025#ifdef __KERNEL__
Lennert Buytenhek794baba2008-12-05 03:25:47 +010026#define STACK_TOP ((current->personality & ADDR_LIMIT_32BIT) ? \
David Howells922a70d2008-02-08 04:19:26 -080027 TASK_SIZE : TASK_SIZE_26)
28#define STACK_TOP_MAX TASK_SIZE
29#endif
30
Linus Torvalds1da177e2005-04-16 15:20:36 -070031union 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
Hyok S. Choie72b0472006-01-13 21:04:17 +000057#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
Linus Torvalds1da177e2005-04-16 15:20:36 -070063#define start_thread(regs,pc,sp) \
64({ \
65 unsigned long *stack = (unsigned long *)sp; \
66 set_fs(USER_DS); \
Russell King59f0cb02008-10-27 11:24:09 +000067 memset(regs->uregs, 0, sizeof(regs->uregs)); \
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 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) */ \
Hyok S. Choie72b0472006-01-13 21:04:17 +000079 nommu_start_thread(regs); \
Linus Torvalds1da177e2005-04-16 15:20:36 -070080})
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
Al Viro815d5ec2006-01-12 01:05:57 -0800100#define task_pt_regs(p) \
Al Viro32d39a92006-01-12 01:05:58 -0800101 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
Al Viro815d5ec2006-01-12 01:05:57 -0800102
103#define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc
104#define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
106/*
107 * Prefetching support - only ARMv5.
108 */
109#if __LINUX_ARM_ARCH__ >= 5
110
111#define ARCH_HAS_PREFETCH
Nicolas Pitre02828842006-12-13 18:39:26 +0100112static inline void prefetch(const void *ptr)
113{
114 __asm__ __volatile__(
Nicolas Pitre16f719d2008-08-12 22:10:59 +0100115 "pld\t%a0"
Nicolas Pitre02828842006-12-13 18:39:26 +0100116 :
Nicolas Pitre16f719d2008-08-12 22:10:59 +0100117 : "p" (ptr)
Nicolas Pitre02828842006-12-13 18:39:26 +0100118 : "cc");
119}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
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 */