1 /*
2  * Copyright (C) 2008 Michal Simek
3  * Copyright (C) 2008 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/segment.h>
18 
19 # ifndef __ASSEMBLY__
20 /* from kernel/cpu/mb.c */
21 extern const struct seq_operations cpuinfo_op;
22 
23 # define cpu_relax()		barrier()
24 # define cpu_sleep()		do {} while (0)
25 # define prepare_to_copy(tsk)	do {} while (0)
26 
27 # endif /* __ASSEMBLY__ */
28 
29 /*
30  * User space process size: memory size
31  *
32  * TASK_SIZE on MMU cpu is usually 1GB. However, on no-MMU arch, both
33  * user processes and the kernel is on the same memory region. They
34  * both share the memory space and that is limited by the amount of
35  * physical memory. thus, we set TASK_SIZE == amount of total memory.
36  */
37 # define TASK_SIZE	(0x81000000 - 0x80000000)
38 
39 /*
40  * Default implementation of macro that returns current
41  * instruction pointer ("program counter").
42  */
43 # define current_text_addr() ({ __label__ _l; _l: &&_l; })
44 
45 /*
46  * This decides where the kernel will search for a free chunk of vm
47  * space during mmap's. We won't be using it
48  */
49 # define TASK_UNMAPPED_BASE	0
50 
51 /* definition in include/linux/sched.h */
52 struct task_struct;
53 
54 /* thread_struct is gone. use thread_info instead. */
55 struct thread_struct { };
56 # define INIT_THREAD	{ }
57 
58 /* Do necessary setup to start up a newly executed thread. */
59 static inline void start_thread(struct pt_regs *regs,
60 				unsigned long pc,
61 				unsigned long usp)
62 {
63 	regs->pc = pc;
64 	regs->r1 = usp;
65 	regs->kernel_mode = 0;
66 }
67 
68 /* Free all resources held by a thread. */
69 static inline void release_thread(struct task_struct *dead_task)
70 {
71 }
72 
73 /* Free all resources held by a thread. */
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 task_pt_regs(tsk) \
88 		(((struct pt_regs *)(THREAD_SIZE + task_stack_page(tsk))) - 1)
89 
90 # define KSTK_EIP(tsk)	(0)
91 # define KSTK_ESP(tsk)	(0)
92 
93 #endif /* _ASM_MICROBLAZE_PROCESSOR_H */
94