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processor.h
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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 */
35 struct task_struct;
36 
37 /*
38  * CPU type and hardware bug flags. Kept separately for each CPU.
39  */
40 struct cpuinfo_frv {
41 #ifdef CONFIG_MMU
42  unsigned long *pgd_quick;
43  unsigned long *pte_quick;
44  unsigned long pgtable_cache_sz;
45 #endif
47 
48 extern 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 
58 struct 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 
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) \
97 do { \
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. */
104 static inline void release_thread(struct task_struct *dead_task)
105 {
106 }
107 
108 extern asmlinkage void save_user_regs(struct user_context *target);
109 extern 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  */
118 static inline void exit_thread(void)
119 {
120 }
121 
122 /*
123  * Return saved PC of a blocked thread.
124  */
125 extern unsigned long thread_saved_pc(struct task_struct *tsk);
126 
127 unsigned 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
136 static 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 */