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1 /*
2  * linux/arch/unicore32/include/asm/thread_info.h
3  *
4  * Code specific to PKUnity SoC and UniCore ISA
5  *
6  * Copyright (C) 2001-2010 GUAN Xue-tao
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  */
12 #ifndef __UNICORE_THREAD_INFO_H__
13 #define __UNICORE_THREAD_INFO_H__
14 
15 #ifdef __KERNEL__
16 
17 #include <linux/compiler.h>
18 #include <asm/fpstate.h>
19 
20 #define THREAD_SIZE_ORDER	1
21 #define THREAD_SIZE		8192
22 #define THREAD_START_SP		(THREAD_SIZE - 8)
23 
24 #ifndef __ASSEMBLY__
25 
26 struct task_struct;
27 struct exec_domain;
28 
29 #include <asm/types.h>
30 
31 typedef struct {
32 	unsigned long seg;
33 } mm_segment_t;
34 
35 struct cpu_context_save {
36 	__u32	r4;
37 	__u32	r5;
38 	__u32	r6;
39 	__u32	r7;
40 	__u32	r8;
41 	__u32	r9;
42 	__u32	r10;
43 	__u32	r11;
44 	__u32	r12;
45 	__u32	r13;
46 	__u32	r14;
47 	__u32	r15;
48 	__u32	r16;
49 	__u32	r17;
50 	__u32	r18;
51 	__u32	r19;
52 	__u32	r20;
53 	__u32	r21;
54 	__u32	r22;
55 	__u32	r23;
56 	__u32	r24;
57 	__u32	r25;
58 	__u32	r26;
59 	__u32	fp;
60 	__u32	sp;
61 	__u32	pc;
62 };
63 
64 /*
65  * low level task data that entry.S needs immediate access to.
66  * __switch_to() assumes cpu_context follows immediately after cpu_domain.
67  */
68 struct thread_info {
69 	unsigned long		flags;		/* low level flags */
70 	int			preempt_count;	/* 0 => preemptable */
71 						/* <0 => bug */
72 	mm_segment_t		addr_limit;	/* address limit */
73 	struct task_struct	*task;		/* main task structure */
74 	struct exec_domain	*exec_domain;	/* execution domain */
75 	__u32			cpu;		/* cpu */
76 	struct cpu_context_save	cpu_context;	/* cpu context */
77 	__u32			syscall;	/* syscall number */
78 	__u8			used_cp[16];	/* thread used copro */
79 #ifdef CONFIG_UNICORE_FPU_F64
80 	struct fp_state		fpstate __attribute__((aligned(8)));
81 #endif
82 	struct restart_block	restart_block;
83 };
84 
85 #define INIT_THREAD_INFO(tsk)						\
86 {									\
87 	.task		= &tsk,						\
88 	.exec_domain	= &default_exec_domain,				\
89 	.flags		= 0,						\
90 	.preempt_count	= INIT_PREEMPT_COUNT,				\
91 	.addr_limit	= KERNEL_DS,					\
92 	.restart_block	= {						\
93 		.fn	= do_no_restart_syscall,			\
94 	},								\
95 }
96 
97 #define init_thread_info	(init_thread_union.thread_info)
98 #define init_stack		(init_thread_union.stack)
99 
100 /*
101  * how to get the thread information struct from C
102  */
103 static inline struct thread_info *current_thread_info(void) __attribute_const__;
104 
current_thread_info(void)105 static inline struct thread_info *current_thread_info(void)
106 {
107 	register unsigned long sp asm ("sp");
108 	return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
109 }
110 
111 #define thread_saved_pc(tsk)	\
112 	((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
113 #define thread_saved_sp(tsk)	\
114 	((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
115 #define thread_saved_fp(tsk)	\
116 	((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
117 
118 #endif
119 
120 /*
121  * We use bit 30 of the preempt_count to indicate that kernel
122  * preemption is occurring.  See <asm/hardirq.h>.
123  */
124 #define PREEMPT_ACTIVE	0x40000000
125 
126 /*
127  * thread information flags:
128  *  TIF_SYSCALL_TRACE	- syscall trace active
129  *  TIF_SIGPENDING	- signal pending
130  *  TIF_NEED_RESCHED	- rescheduling necessary
131  *  TIF_NOTIFY_RESUME	- callback before returning to user
132  */
133 #define TIF_SIGPENDING		0
134 #define TIF_NEED_RESCHED	1
135 #define TIF_NOTIFY_RESUME	2	/* callback before returning to user */
136 #define TIF_SYSCALL_TRACE	8
137 #define TIF_MEMDIE		18
138 #define TIF_RESTORE_SIGMASK	20
139 
140 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
141 #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
142 #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
143 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
144 #define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
145 
146 /*
147  * Change these and you break ASM code in entry-common.S
148  */
149 #define _TIF_WORK_MASK		0x000000ff
150 
151 #endif /* __KERNEL__ */
152 #endif /* __UNICORE_THREAD_INFO_H__ */
153