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
26 #define task_pt_regs(tsk) \
27 (((struct pt_regs *)(THREAD_SIZE + task_stack_page(tsk))) - 1)
28
29 /* Do necessary setup to start up a newly executed thread. */
30 void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp);
31
32 extern void ret_from_fork(void);
33 extern void ret_from_kernel_thread(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 extern unsigned long thread_saved_pc(struct task_struct *t);
73
74 extern unsigned long get_wchan(struct task_struct *p);
75
76 # define KSTK_EIP(tsk) (0)
77 # define KSTK_ESP(tsk) (0)
78
79 # else /* CONFIG_MMU */
80
81 /*
82 * This is used to define STACK_TOP, and with MMU it must be below
83 * kernel base to select the correct PGD when handling MMU exceptions.
84 */
85 # define TASK_SIZE (CONFIG_KERNEL_START)
86
87 /*
88 * This decides where the kernel will search for a free chunk of vm
89 * space during mmap's.
90 */
91 # define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3)
92
93 # define THREAD_KSP 0
94
95 # ifndef __ASSEMBLY__
96
97 /*
98 * Default implementation of macro that returns current
99 * instruction pointer ("program counter").
100 */
101 # define current_text_addr() ({ __label__ _l; _l: &&_l; })
102
103 /* If you change this, you must change the associated assembly-languages
104 * constants defined below, THREAD_*.
105 */
106 struct thread_struct {
107 /* kernel stack pointer (must be first field in structure) */
108 unsigned long ksp;
109 unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */
110 void *pgdir; /* root of page-table tree */
111 struct pt_regs *regs; /* Pointer to saved register state */
112 };
113
114 # define INIT_THREAD { \
115 .ksp = sizeof init_stack + (unsigned long)init_stack, \
116 .pgdir = swapper_pg_dir, \
117 }
118
119 /* Free all resources held by a thread. */
120 static inline void release_thread(struct task_struct *dead_task)
121 {
122 }
123
124 /* Return saved (kernel) PC of a blocked thread. */
125 # define thread_saved_pc(tsk) \
126 ((tsk)->thread.regs ? (tsk)->thread.regs->r15 : 0)
127
128 unsigned long get_wchan(struct task_struct *p);
129
130 /* The size allocated for kernel stacks. This _must_ be a power of two! */
131 # define KERNEL_STACK_SIZE 0x2000
132
133 /* Return some info about the user process TASK. */
134 # define task_tos(task) ((unsigned long)(task) + KERNEL_STACK_SIZE)
135 # define task_regs(task) ((struct pt_regs *)task_tos(task) - 1)
136
137 # define task_pt_regs_plus_args(tsk) \
138 ((void *)task_pt_regs(tsk))
139
140 # define task_sp(task) (task_regs(task)->r1)
141 # define task_pc(task) (task_regs(task)->pc)
142 /* Grotty old names for some. */
143 # define KSTK_EIP(task) (task_pc(task))
144 # define KSTK_ESP(task) (task_sp(task))
145
146 /* FIXME */
147 # define deactivate_mm(tsk, mm) do { } while (0)
148
149 # define STACK_TOP TASK_SIZE
150 # define STACK_TOP_MAX STACK_TOP
151
152 #ifdef CONFIG_DEBUG_FS
153 extern struct dentry *of_debugfs_root;
154 #endif
155
156 # endif /* __ASSEMBLY__ */
157 # endif /* CONFIG_MMU */
158 #endif /* _ASM_MICROBLAZE_PROCESSOR_H */
159
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