Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
32union debug_insn {
33 u32 arm;
34 u16 thumb;
35};
36
37struct debug_entry {
38 u32 address;
39 union debug_insn insn;
40};
41
42struct debug_info {
43 int nsaved;
44 struct debug_entry bp[2];
45#ifdef CONFIG_HAVE_HW_BREAKPOINT
46 struct perf_event *hbp[ARM_MAX_HBP_SLOTS];
47#endif
48};
49
50struct thread_struct {
51 /* fault info */
52 unsigned long address;
53 unsigned long trap_no;
54 unsigned long error_code;
55 /* debugging */
56 struct debug_info debug;
57};
58
59#define INIT_THREAD { }
60
61#ifdef CONFIG_MMU
62#define nommu_start_thread(regs) do { } while (0)
63#else
64#define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data
65#endif
66
67#define start_thread(regs,pc,sp) \
68({ \
69 unsigned long *stack = (unsigned long *)sp; \
70 set_fs(USER_DS); \
71 memset(regs->uregs, 0, sizeof(regs->uregs)); \
72 if (current->personality & ADDR_LIMIT_32BIT) \
73 regs->ARM_cpsr = USR_MODE; \
74 else \
75 regs->ARM_cpsr = USR26_MODE; \
76 if (elf_hwcap & HWCAP_THUMB && pc & 1) \
77 regs->ARM_cpsr |= PSR_T_BIT; \
78 regs->ARM_cpsr |= PSR_ENDSTATE; \
79 regs->ARM_pc = pc & ~1; /* pc */ \
80 regs->ARM_sp = sp; /* sp */ \
81 regs->ARM_r2 = stack[2]; /* r2 (envp) */ \
82 regs->ARM_r1 = stack[1]; /* r1 (argv) */ \
83 regs->ARM_r0 = stack[0]; /* r0 (argc) */ \
84 nommu_start_thread(regs); \
85})
86
87/* Forward declaration, a strange C thing */
88struct task_struct;
89
90/* Free all resources held by a thread. */
91extern void release_thread(struct task_struct *);
92
93/* Prepare to copy thread state - unlazy all lazy status */
94#define prepare_to_copy(tsk) do { } while (0)
95
96unsigned long get_wchan(struct task_struct *p);
97
98#if __LINUX_ARM_ARCH__ == 6
99#define cpu_relax() smp_mb()
100#else
101#define cpu_relax() barrier()
102#endif
103
104/*
105 * Create a new kernel thread
106 */
107extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
108
109#define task_pt_regs(p) \
110 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
111
112#define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc
113#define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp
114
115/*
116 * Prefetching support - only ARMv5.
117 */
118#if __LINUX_ARM_ARCH__ >= 5
119
120#define ARCH_HAS_PREFETCH
121static inline void prefetch(const void *ptr)
122{
123 __asm__ __volatile__(
124 "pld\t%a0"
125 :
126 : "p" (ptr)
127 : "cc");
128}
129
130#define ARCH_HAS_PREFETCHW
131#define prefetchw(ptr) prefetch(ptr)
132
133#define ARCH_HAS_SPINLOCK_PREFETCH
134#define spin_lock_prefetch(x) do { } while (0)
135
136#endif
137
138#endif
139
140#endif /* __ASM_ARM_PROCESSOR_H */