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