1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_M68K_THREAD_INFO_H
3 #define _ASM_M68K_THREAD_INFO_H
4 
5 #include <asm/types.h>
6 #include <asm/page.h>
7 
8 /*
9  * On machines with 4k pages we default to an 8k thread size, though we
10  * allow a 4k with config option. Any other machine page size then
11  * the thread size must match the page size (which is 8k and larger here).
12  */
13 #if PAGE_SHIFT < 13
14 #ifdef CONFIG_4KSTACKS
15 #define THREAD_SIZE	4096
16 #else
17 #define THREAD_SIZE	8192
18 #endif
19 #else
20 #define THREAD_SIZE	PAGE_SIZE
21 #endif
22 #define THREAD_SIZE_ORDER	((THREAD_SIZE / PAGE_SIZE) - 1)
23 
24 #ifndef __ASSEMBLY__
25 
26 struct thread_info {
27 	struct task_struct	*task;		/* main task structure */
28 	unsigned long		flags;
29 	int			preempt_count;	/* 0 => preemptable, <0 => BUG */
30 	__u32			cpu;		/* should always be 0 on m68k */
31 	unsigned long		tp_value;	/* thread pointer */
32 };
33 #endif /* __ASSEMBLY__ */
34 
35 #define INIT_THREAD_INFO(tsk)			\
36 {						\
37 	.task		= &tsk,			\
38 	.preempt_count	= INIT_PREEMPT_COUNT,	\
39 }
40 
41 #ifndef __ASSEMBLY__
42 /* how to get the thread information struct from C */
43 static inline struct thread_info *current_thread_info(void)
44 {
45 	struct thread_info *ti;
46 	__asm__(
47 		"move.l %%sp, %0 \n\t"
48 		"and.l  %1, %0"
49 		: "=&d"(ti)
50 		: "di" (~(THREAD_SIZE-1))
51 		);
52 	return ti;
53 }
54 #endif
55 
56 /* entry.S relies on these definitions!
57  * bits 0-7 are tested at every exception exit
58  * bits 8-15 are also tested at syscall exit
59  */
60 #define TIF_NOTIFY_SIGNAL	4
61 #define TIF_NOTIFY_RESUME	5	/* callback before returning to user */
62 #define TIF_SIGPENDING		6	/* signal pending */
63 #define TIF_NEED_RESCHED	7	/* rescheduling necessary */
64 #define TIF_DELAYED_TRACE	14	/* single step a syscall */
65 #define TIF_SYSCALL_TRACE	15	/* syscall trace active */
66 #define TIF_MEMDIE		16	/* is terminating due to OOM killer */
67 #define TIF_RESTORE_SIGMASK	18	/* restore signal mask in do_signal */
68 
69 #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
70 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
71 #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
72 #define _TIF_DELAYED_TRACE	(1 << TIF_DELAYED_TRACE)
73 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
74 #define _TIF_MEMDIE		(1 << TIF_MEMDIE)
75 #define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
76 
77 #endif	/* _ASM_M68K_THREAD_INFO_H */
78