projects/linux·blob 61844250 · refs

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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 ([email protected])
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#define MCA_bus 0
58
59struct thread_struct {
60 struct pt_regs *frame; /* [GR28] exception frame ptr for this thread */
61 struct task_struct *curr; /* [GR29] current pointer for this thread */
62 unsigned long sp; /* [GR1 ] kernel stack pointer */
63 unsigned long fp; /* [GR2 ] kernel frame pointer */
64 unsigned long lr; /* link register */
65 unsigned long pc; /* program counter */
66 unsigned long gr[12]; /* [GR16-GR27] */
67 unsigned long sched_lr; /* LR from schedule() */
68
69 union {
70 struct pt_regs *frame0; /* top (user) stack frame */
71 struct user_context *user; /* userspace context */
72 };
73} __attribute__((aligned(8)));
74
75extern struct pt_regs *__kernel_frame0_ptr;
76extern struct task_struct *__kernel_current_task;
77
78#endif
79
80#ifndef __ASSEMBLY__
81#define INIT_THREAD_FRAME0 \
82 ((struct pt_regs *) \
83 (sizeof(init_stack) + (unsigned long) init_stack - sizeof(struct user_context)))
84
85#define INIT_THREAD { \
86 NULL, \
87 (struct task_struct *) init_stack, \
88 0, 0, 0, 0, \
89 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, \
90 0, \
91 { INIT_THREAD_FRAME0 }, \
92}
93
94/*
95 * do necessary setup to start up a newly executed thread.
96 * - need to discard the frame stacked by init() invoking the execve syscall
97 */
98#define start_thread(_regs, _pc, _usp) \
99do { \
100 set_fs(USER_DS); /* reads from user space */ \
101 __frame = __kernel_frame0_ptr; \
102 __frame->pc = (_pc); \
103 __frame->psr &= ~PSR_S; \
104 __frame->sp = (_usp); \
105} while(0)
106
107extern void prepare_to_copy(struct task_struct *tsk);
108
109/* Free all resources held by a thread. */
110static inline void release_thread(struct task_struct *dead_task)
111{
112}
113
114extern asmlinkage int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
115extern asmlinkage void save_user_regs(struct user_context *target);
116extern asmlinkage void *restore_user_regs(const struct user_context *target, ...);
117
118#define copy_segments(tsk, mm) do { } while (0)
119#define release_segments(mm) do { } while (0)
120#define forget_segments() do { } while (0)
121
122/*
123 * Free current thread data structures etc..
124 */
125static inline void exit_thread(void)
126{
127}
128
129/*
130 * Return saved PC of a blocked thread.
131 */
132extern unsigned long thread_saved_pc(struct task_struct *tsk);
133
134unsigned long get_wchan(struct task_struct *p);
135
136#define KSTK_EIP(tsk) ((tsk)->thread.frame0->pc)
137#define KSTK_ESP(tsk) ((tsk)->thread.frame0->sp)
138
139/* Allocation and freeing of basic task resources. */
140extern struct task_struct *alloc_task_struct(void);
141extern void free_task_struct(struct task_struct *p);
142
143#define cpu_relax() barrier()
144
145/* data cache prefetch */
146#define ARCH_HAS_PREFETCH
147static inline void prefetch(const void *x)
148{
149 asm volatile("dcpl %0,gr0,#0" : : "r"(x));
150}
151
152#endif /* __ASSEMBLY__ */
153#endif /* _ASM_PROCESSOR_H */