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 */
35 struct task_struct;
36
37 /*
38 * Bus types
39 */
40 #define EISA_bus 0
41
42 struct thread_struct {
43 struct pt_regs *frame; /* [GR28] exception frame ptr for this thread */
44 struct task_struct *curr; /* [GR29] current pointer for this thread */
45 unsigned long sp; /* [GR1 ] kernel stack pointer */
46 unsigned long fp; /* [GR2 ] kernel frame pointer */
47 unsigned long lr; /* link register */
48 unsigned long pc; /* program counter */
49 unsigned long gr[12]; /* [GR16-GR27] */
50 unsigned long sched_lr; /* LR from schedule() */
51
52 union {
53 struct pt_regs *frame0; /* top (user) stack frame */
54 struct user_context *user; /* userspace context */
55 };
56 } __attribute__((aligned(8)));
57
58 extern struct pt_regs *__kernel_frame0_ptr;
59 extern struct task_struct *__kernel_current_task;
60
61 #endif
62
63 #ifndef __ASSEMBLY__
64 #define INIT_THREAD_FRAME0 \
65 ((struct pt_regs *) \
66 (sizeof(init_stack) + (unsigned long) init_stack - sizeof(struct user_context)))
67
68 #define INIT_THREAD { \
69 NULL, \
70 (struct task_struct *) init_stack, \
71 0, 0, 0, 0, \
72 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, \
73 0, \
74 { INIT_THREAD_FRAME0 }, \
75 }
76
77 /*
78 * do necessary setup to start up a newly executed thread.
79 */
80 #define start_thread(_regs, _pc, _usp) \
81 do { \
82 _regs->pc = (_pc); \
83 _regs->psr &= ~PSR_S; \
84 _regs->sp = (_usp); \
85 } while(0)
86
87 /* Free all resources held by a thread. */
release_thread(struct task_struct * dead_task)88 static inline void release_thread(struct task_struct *dead_task)
89 {
90 }
91
92 extern asmlinkage void save_user_regs(struct user_context *target);
93 extern asmlinkage void *restore_user_regs(const struct user_context *target, ...);
94
95 #define copy_segments(tsk, mm) do { } while (0)
96 #define release_segments(mm) do { } while (0)
97 #define forget_segments() do { } while (0)
98
99 /*
100 * Return saved PC of a blocked thread.
101 */
102 extern unsigned long thread_saved_pc(struct task_struct *tsk);
103
104 unsigned long get_wchan(struct task_struct *p);
105
106 #define KSTK_EIP(tsk) ((tsk)->thread.frame0->pc)
107 #define KSTK_ESP(tsk) ((tsk)->thread.frame0->sp)
108
109 #define cpu_relax() barrier()
110 #define cpu_relax_lowlatency() cpu_relax()
111
112 /* data cache prefetch */
113 #define ARCH_HAS_PREFETCH
prefetch(const void * x)114 static inline void prefetch(const void *x)
115 {
116 asm volatile("dcpl %0,gr0,#0" : : "r"(x));
117 }
118
119 #endif /* __ASSEMBLY__ */
120 #endif /* _ASM_PROCESSOR_H */
121