Linux kernel mirror (for testing)
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1/*
2 * arch/arm/include/asm/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/hw_breakpoint.h>
23#include <asm/ptrace.h>
24#include <asm/types.h>
25#include <asm/system.h>
26
27#ifdef __KERNEL__
28#define STACK_TOP ((current->personality & ADDR_LIMIT_32BIT) ? \
29 TASK_SIZE : TASK_SIZE_26)
30#define STACK_TOP_MAX TASK_SIZE
31#endif
32
33struct debug_info {
34#ifdef CONFIG_HAVE_HW_BREAKPOINT
35 struct perf_event *hbp[ARM_MAX_HBP_SLOTS];
36#endif
37};
38
39struct thread_struct {
40 /* fault info */
41 unsigned long address;
42 unsigned long trap_no;
43 unsigned long error_code;
44 /* debugging */
45 struct debug_info debug;
46};
47
48#define INIT_THREAD { }
49
50#ifdef CONFIG_MMU
51#define nommu_start_thread(regs) do { } while (0)
52#else
53#define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data
54#endif
55
56#define start_thread(regs,pc,sp) \
57({ \
58 unsigned long *stack = (unsigned long *)sp; \
59 set_fs(USER_DS); \
60 memset(regs->uregs, 0, sizeof(regs->uregs)); \
61 if (current->personality & ADDR_LIMIT_32BIT) \
62 regs->ARM_cpsr = USR_MODE; \
63 else \
64 regs->ARM_cpsr = USR26_MODE; \
65 if (elf_hwcap & HWCAP_THUMB && pc & 1) \
66 regs->ARM_cpsr |= PSR_T_BIT; \
67 regs->ARM_cpsr |= PSR_ENDSTATE; \
68 regs->ARM_pc = pc & ~1; /* pc */ \
69 regs->ARM_sp = sp; /* sp */ \
70 regs->ARM_r2 = stack[2]; /* r2 (envp) */ \
71 regs->ARM_r1 = stack[1]; /* r1 (argv) */ \
72 regs->ARM_r0 = stack[0]; /* r0 (argc) */ \
73 nommu_start_thread(regs); \
74})
75
76/* Forward declaration, a strange C thing */
77struct task_struct;
78
79/* Free all resources held by a thread. */
80extern void release_thread(struct task_struct *);
81
82/* Prepare to copy thread state - unlazy all lazy status */
83#define prepare_to_copy(tsk) do { } while (0)
84
85unsigned long get_wchan(struct task_struct *p);
86
87#if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327)
88#define cpu_relax() smp_mb()
89#else
90#define cpu_relax() barrier()
91#endif
92
93/*
94 * Create a new kernel thread
95 */
96extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
97
98#define task_pt_regs(p) \
99 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
100
101#define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc
102#define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp
103
104/*
105 * Prefetching support - only ARMv5.
106 */
107#if __LINUX_ARM_ARCH__ >= 5
108
109#define ARCH_HAS_PREFETCH
110static inline void prefetch(const void *ptr)
111{
112 __asm__ __volatile__(
113 "pld\t%a0"
114 :
115 : "p" (ptr)
116 : "cc");
117}
118
119#define ARCH_HAS_PREFETCHW
120#define prefetchw(ptr) prefetch(ptr)
121
122#define ARCH_HAS_SPINLOCK_PREFETCH
123#define spin_lock_prefetch(x) do { } while (0)
124
125#endif
126
127#define HAVE_ARCH_PICK_MMAP_LAYOUT
128
129#endif
130
131#endif /* __ASM_ARM_PROCESSOR_H */