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 #include <asm/segment.h>
8 
9 /*
10  * On machines with 4k pages we default to an 8k thread size, though we
11  * allow a 4k with config option. Any other machine page size then
12  * the thread size must match the page size (which is 8k and larger here).
13  */
14 #if PAGE_SHIFT < 13
15 #ifdef CONFIG_4KSTACKS
16 #define THREAD_SIZE	4096
17 #else
18 #define THREAD_SIZE	8192
19 #endif
20 #else
21 #define THREAD_SIZE	PAGE_SIZE
22 #endif
23 #define THREAD_SIZE_ORDER	((THREAD_SIZE / PAGE_SIZE) - 1)
24 
25 #ifndef __ASSEMBLY__
26 
27 struct thread_info {
28 	struct task_struct	*task;		/* main task structure */
29 	unsigned long		flags;
30 	mm_segment_t		addr_limit;	/* thread address space */
31 	int			preempt_count;	/* 0 => preemptable, <0 => BUG */
32 	__u32			cpu;		/* should always be 0 on m68k */
33 	unsigned long		tp_value;	/* thread pointer */
34 };
35 #endif /* __ASSEMBLY__ */
36 
37 #define INIT_THREAD_INFO(tsk)			\
38 {						\
39 	.task		= &tsk,			\
40 	.addr_limit	= KERNEL_DS,		\
41 	.preempt_count	= INIT_PREEMPT_COUNT,	\
42 }
43 
44 #ifndef __ASSEMBLY__
45 /* how to get the thread information struct from C */
46 static inline struct thread_info *current_thread_info(void)
47 {
48 	struct thread_info *ti;
49 	__asm__(
50 		"move.l %%sp, %0 \n\t"
51 		"and.l  %1, %0"
52 		: "=&d"(ti)
53 		: "di" (~(THREAD_SIZE-1))
54 		);
55 	return ti;
56 }
57 #endif
58 
59 /* entry.S relies on these definitions!
60  * bits 0-7 are tested at every exception exit
61  * bits 8-15 are also tested at syscall exit
62  */
63 #define TIF_NOTIFY_SIGNAL	4
64 #define TIF_NOTIFY_RESUME	5	/* callback before returning to user */
65 #define TIF_SIGPENDING		6	/* signal pending */
66 #define TIF_NEED_RESCHED	7	/* rescheduling necessary */
67 #define TIF_DELAYED_TRACE	14	/* single step a syscall */
68 #define TIF_SYSCALL_TRACE	15	/* syscall trace active */
69 #define TIF_MEMDIE		16	/* is terminating due to OOM killer */
70 #define TIF_RESTORE_SIGMASK	18	/* restore signal mask in do_signal */
71 
72 #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
73 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
74 #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
75 #define _TIF_DELAYED_TRACE	(1 << TIF_DELAYED_TRACE)
76 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
77 #define _TIF_MEMDIE		(1 << TIF_MEMDIE)
78 #define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
79 
80 #endif	/* _ASM_M68K_THREAD_INFO_H */
81