1 /*
2 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
3 * Copyright (C) 2008-2009 PetaLogix
4 * Copyright (C) 2006 Atmark Techno, Inc.
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file "COPYING" in the main directory of this archive
8 * for more details.
9 */
10
11 #ifndef _ASM_MICROBLAZE_PROCESSOR_H
12 #define _ASM_MICROBLAZE_PROCESSOR_H
13
14 #include <asm/ptrace.h>
15 #include <asm/setup.h>
16 #include <asm/registers.h>
17 #include <asm/entry.h>
18 #include <asm/current.h>
19
20 # ifndef __ASSEMBLY__
21 /* from kernel/cpu/mb.c */
22 extern const struct seq_operations cpuinfo_op;
23
24 # define cpu_relax() barrier()
25 # define cpu_sleep() do {} while (0)
26 # define prepare_to_copy(tsk) do {} while (0)
27
28 #define task_pt_regs(tsk) \
29 (((struct pt_regs *)(THREAD_SIZE + task_stack_page(tsk))) - 1)
30
31 /* Do necessary setup to start up a newly executed thread. */
32 void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp);
33
34 extern void ret_from_fork(void);
35
36 # endif /* __ASSEMBLY__ */
37
38 # ifndef CONFIG_MMU
39 /*
40 * User space process size: memory size
41 *
42 * TASK_SIZE on MMU cpu is usually 1GB. However, on no-MMU arch, both
43 * user processes and the kernel is on the same memory region. They
44 * both share the memory space and that is limited by the amount of
45 * physical memory. thus, we set TASK_SIZE == amount of total memory.
46 */
47 # define TASK_SIZE (0x81000000 - 0x80000000)
48
49 /*
50 * Default implementation of macro that returns current
51 * instruction pointer ("program counter").
52 */
53 # define current_text_addr() ({ __label__ _l; _l: &&_l; })
54
55 /*
56 * This decides where the kernel will search for a free chunk of vm
57 * space during mmap's. We won't be using it
58 */
59 # define TASK_UNMAPPED_BASE 0
60
61 /* definition in include/linux/sched.h */
62 struct task_struct;
63
64 /* thread_struct is gone. use thread_info instead. */
65 struct thread_struct { };
66 # define INIT_THREAD { }
67
68 /* Free all resources held by a thread. */
release_thread(struct task_struct * dead_task)69 static inline void release_thread(struct task_struct *dead_task)
70 {
71 }
72
73 /* Free all resources held by a thread. */
exit_thread(void)74 static inline void exit_thread(void)
75 {
76 }
77
78 extern unsigned long thread_saved_pc(struct task_struct *t);
79
80 extern unsigned long get_wchan(struct task_struct *p);
81
82 /*
83 * create a kernel thread without removing it from tasklists
84 */
85 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
86
87 # define KSTK_EIP(tsk) (0)
88 # define KSTK_ESP(tsk) (0)
89
90 # else /* CONFIG_MMU */
91
92 /*
93 * This is used to define STACK_TOP, and with MMU it must be below
94 * kernel base to select the correct PGD when handling MMU exceptions.
95 */
96 # define TASK_SIZE (CONFIG_KERNEL_START)
97
98 /*
99 * This decides where the kernel will search for a free chunk of vm
100 * space during mmap's.
101 */
102 # define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3)
103
104 # define THREAD_KSP 0
105
106 # ifndef __ASSEMBLY__
107
108 /*
109 * Default implementation of macro that returns current
110 * instruction pointer ("program counter").
111 */
112 # define current_text_addr() ({ __label__ _l; _l: &&_l; })
113
114 /* If you change this, you must change the associated assembly-languages
115 * constants defined below, THREAD_*.
116 */
117 struct thread_struct {
118 /* kernel stack pointer (must be first field in structure) */
119 unsigned long ksp;
120 unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */
121 void *pgdir; /* root of page-table tree */
122 struct pt_regs *regs; /* Pointer to saved register state */
123 };
124
125 # define INIT_THREAD { \
126 .ksp = sizeof init_stack + (unsigned long)init_stack, \
127 .pgdir = swapper_pg_dir, \
128 }
129
130 /* Free all resources held by a thread. */
release_thread(struct task_struct * dead_task)131 extern inline void release_thread(struct task_struct *dead_task)
132 {
133 }
134
135 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
136
137 /* Free current thread data structures etc. */
exit_thread(void)138 static inline void exit_thread(void)
139 {
140 }
141
142 /* Return saved (kernel) PC of a blocked thread. */
143 # define thread_saved_pc(tsk) \
144 ((tsk)->thread.regs ? (tsk)->thread.regs->r15 : 0)
145
146 unsigned long get_wchan(struct task_struct *p);
147
148 /* The size allocated for kernel stacks. This _must_ be a power of two! */
149 # define KERNEL_STACK_SIZE 0x2000
150
151 /* Return some info about the user process TASK. */
152 # define task_tos(task) ((unsigned long)(task) + KERNEL_STACK_SIZE)
153 # define task_regs(task) ((struct pt_regs *)task_tos(task) - 1)
154
155 # define task_pt_regs_plus_args(tsk) \
156 ((void *)task_pt_regs(tsk))
157
158 # define task_sp(task) (task_regs(task)->r1)
159 # define task_pc(task) (task_regs(task)->pc)
160 /* Grotty old names for some. */
161 # define KSTK_EIP(task) (task_pc(task))
162 # define KSTK_ESP(task) (task_sp(task))
163
164 /* FIXME */
165 # define deactivate_mm(tsk, mm) do { } while (0)
166
167 # define STACK_TOP TASK_SIZE
168 # define STACK_TOP_MAX STACK_TOP
169
170 void disable_hlt(void);
171 void enable_hlt(void);
172 void default_idle(void);
173
174 #ifdef CONFIG_DEBUG_FS
175 extern struct dentry *of_debugfs_root;
176 #endif
177
178 # endif /* __ASSEMBLY__ */
179 # endif /* CONFIG_MMU */
180 #endif /* _ASM_MICROBLAZE_PROCESSOR_H */
181