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