Linux kernel mirror (for testing)
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1/* processor.h: FRV processor definitions
2 *
3 * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#ifndef _ASM_PROCESSOR_H
13#define _ASM_PROCESSOR_H
14
15#include <asm/mem-layout.h>
16
17#ifndef __ASSEMBLY__
18/*
19 * Default implementation of macro that returns current
20 * instruction pointer ("program counter").
21 */
22#define current_text_addr() ({ __label__ _l; _l: &&_l;})
23
24#include <linux/compiler.h>
25#include <linux/linkage.h>
26#include <asm/sections.h>
27#include <asm/segment.h>
28#include <asm/fpu.h>
29#include <asm/registers.h>
30#include <asm/ptrace.h>
31#include <asm/current.h>
32#include <asm/cache.h>
33
34/* Forward declaration, a strange C thing */
35struct task_struct;
36
37/*
38 * CPU type and hardware bug flags. Kept separately for each CPU.
39 */
40struct cpuinfo_frv {
41#ifdef CONFIG_MMU
42 unsigned long *pgd_quick;
43 unsigned long *pte_quick;
44 unsigned long pgtable_cache_sz;
45#endif
46} __cacheline_aligned;
47
48extern struct cpuinfo_frv __nongprelbss boot_cpu_data;
49
50#define cpu_data (&boot_cpu_data)
51#define current_cpu_data boot_cpu_data
52
53/*
54 * Bus types
55 */
56#define EISA_bus 0
57
58struct thread_struct {
59 struct pt_regs *frame; /* [GR28] exception frame ptr for this thread */
60 struct task_struct *curr; /* [GR29] current pointer for this thread */
61 unsigned long sp; /* [GR1 ] kernel stack pointer */
62 unsigned long fp; /* [GR2 ] kernel frame pointer */
63 unsigned long lr; /* link register */
64 unsigned long pc; /* program counter */
65 unsigned long gr[12]; /* [GR16-GR27] */
66 unsigned long sched_lr; /* LR from schedule() */
67
68 union {
69 struct pt_regs *frame0; /* top (user) stack frame */
70 struct user_context *user; /* userspace context */
71 };
72} __attribute__((aligned(8)));
73
74extern struct pt_regs *__kernel_frame0_ptr;
75extern struct task_struct *__kernel_current_task;
76
77#endif
78
79#ifndef __ASSEMBLY__
80#define INIT_THREAD_FRAME0 \
81 ((struct pt_regs *) \
82 (sizeof(init_stack) + (unsigned long) init_stack - sizeof(struct user_context)))
83
84#define INIT_THREAD { \
85 NULL, \
86 (struct task_struct *) init_stack, \
87 0, 0, 0, 0, \
88 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, \
89 0, \
90 { INIT_THREAD_FRAME0 }, \
91}
92
93/*
94 * do necessary setup to start up a newly executed thread.
95 */
96#define start_thread(_regs, _pc, _usp) \
97do { \
98 _regs->pc = (_pc); \
99 _regs->psr &= ~PSR_S; \
100 _regs->sp = (_usp); \
101} while(0)
102
103/* Free all resources held by a thread. */
104static inline void release_thread(struct task_struct *dead_task)
105{
106}
107
108extern asmlinkage void save_user_regs(struct user_context *target);
109extern asmlinkage void *restore_user_regs(const struct user_context *target, ...);
110
111#define copy_segments(tsk, mm) do { } while (0)
112#define release_segments(mm) do { } while (0)
113#define forget_segments() do { } while (0)
114
115/*
116 * Free current thread data structures etc..
117 */
118static inline void exit_thread(void)
119{
120}
121
122/*
123 * Return saved PC of a blocked thread.
124 */
125extern unsigned long thread_saved_pc(struct task_struct *tsk);
126
127unsigned long get_wchan(struct task_struct *p);
128
129#define KSTK_EIP(tsk) ((tsk)->thread.frame0->pc)
130#define KSTK_ESP(tsk) ((tsk)->thread.frame0->sp)
131
132#define cpu_relax() barrier()
133
134/* data cache prefetch */
135#define ARCH_HAS_PREFETCH
136static inline void prefetch(const void *x)
137{
138 asm volatile("dcpl %0,gr0,#0" : : "r"(x));
139}
140
141#endif /* __ASSEMBLY__ */
142#endif /* _ASM_PROCESSOR_H */