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 * 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
46 } __cacheline_aligned;
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 #define MCA_bus 0
58
59 struct 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
75 extern struct pt_regs *__kernel_frame0_ptr;
76 extern 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) \
99 do { \
100 __frame = __kernel_frame0_ptr; \
101 __frame->pc = (_pc); \
102 __frame->psr &= ~PSR_S; \
103 __frame->sp = (_usp); \
104 } while(0)
105
106 extern void prepare_to_copy(struct task_struct *tsk);
107
108 /* Free all resources held by a thread. */
release_thread(struct task_struct * dead_task)109 static inline void release_thread(struct task_struct *dead_task)
110 {
111 }
112
113 extern asmlinkage int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
114 extern asmlinkage void save_user_regs(struct user_context *target);
115 extern asmlinkage void *restore_user_regs(const struct user_context *target, ...);
116
117 #define copy_segments(tsk, mm) do { } while (0)
118 #define release_segments(mm) do { } while (0)
119 #define forget_segments() do { } while (0)
120
121 /*
122 * Free current thread data structures etc..
123 */
exit_thread(void)124 static inline void exit_thread(void)
125 {
126 }
127
128 /*
129 * Return saved PC of a blocked thread.
130 */
131 extern unsigned long thread_saved_pc(struct task_struct *tsk);
132
133 unsigned long get_wchan(struct task_struct *p);
134
135 #define KSTK_EIP(tsk) ((tsk)->thread.frame0->pc)
136 #define KSTK_ESP(tsk) ((tsk)->thread.frame0->sp)
137
138 #define cpu_relax() barrier()
139
140 /* data cache prefetch */
141 #define ARCH_HAS_PREFETCH
prefetch(const void * x)142 static inline void prefetch(const void *x)
143 {
144 asm volatile("dcpl %0,gr0,#0" : : "r"(x));
145 }
146
147 #endif /* __ASSEMBLY__ */
148 #endif /* _ASM_PROCESSOR_H */
149