thread_info.h revision d88e4cb67197d007fb778d62fe17360e970d5bfa 
1#ifndef _ASM_M68K_THREAD_INFO_H
2#define _ASM_M68K_THREAD_INFO_H
3
4#include <asm/types.h>
5#include <asm/page.h>
6
7/*
8 * On machines with 4k pages we default to an 8k thread size, though we
9 * allow a 4k with config option. Any other machine page size then
10 * the thread size must match the page size (which is 8k and larger here).
11 */
12#if PAGE_SHIFT < 13
13#ifdef CONFIG_4KSTACKS
14#define THREAD_SIZE	4096
15#else
16#define THREAD_SIZE	8192
17#endif
18#else
19#define THREAD_SIZE	PAGE_SIZE
20#endif
21#define THREAD_SIZE_ORDER	((THREAD_SIZE / PAGE_SIZE) - 1)
22
23#ifndef __ASSEMBLY__
24
25struct thread_info {
26	struct task_struct	*task;		/* main task structure */
27	unsigned long		flags;
28	struct exec_domain	*exec_domain;	/* execution domain */
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	struct restart_block    restart_block;
33};
34#endif /* __ASSEMBLY__ */
35
36#define PREEMPT_ACTIVE		0x4000000
37
38#define INIT_THREAD_INFO(tsk)			\
39{						\
40	.task		= &tsk,			\
41	.exec_domain	= &default_exec_domain,	\
42	.preempt_count	= INIT_PREEMPT_COUNT,	\
43	.restart_block = {			\
44		.fn = do_no_restart_syscall,	\
45	},					\
46}
47
48#define init_stack		(init_thread_union.stack)
49
50#ifdef CONFIG_MMU
51
52#ifndef __ASSEMBLY__
53#include <asm/current.h>
54#endif
55
56#ifdef ASM_OFFSETS_C
57#define task_thread_info(tsk)	((struct thread_info *) NULL)
58#else
59#include <asm/asm-offsets.h>
60#define task_thread_info(tsk)	((struct thread_info *)((char *)tsk+TASK_TINFO))
61#endif
62
63#define init_thread_info	(init_task.thread.info)
64#define task_stack_page(tsk)	((tsk)->stack)
65#define current_thread_info()	task_thread_info(current)
66
67#define __HAVE_THREAD_FUNCTIONS
68
69#define setup_thread_stack(p, org) ({			\
70	*(struct task_struct **)(p)->stack = (p);	\
71	task_thread_info(p)->task = (p);		\
72})
73
74#define end_of_stack(p)		((unsigned long *)(p)->stack + 1)
75
76#else /* !CONFIG_MMU */
77
78#ifndef __ASSEMBLY__
79/* how to get the thread information struct from C */
80static inline struct thread_info *current_thread_info(void)
81{
82	struct thread_info *ti;
83	__asm__(
84		"move.l %%sp, %0 \n\t"
85		"and.l  %1, %0"
86		: "=&d"(ti)
87		: "di" (~(THREAD_SIZE-1))
88		);
89	return ti;
90}
91#endif
92
93#define init_thread_info	(init_thread_union.thread_info)
94
95#endif /* CONFIG_MMU */
96
97/* entry.S relies on these definitions!
98 * bits 0-7 are tested at every exception exit
99 * bits 8-15 are also tested at syscall exit
100 */
101#define TIF_SIGPENDING		6	/* signal pending */
102#define TIF_NEED_RESCHED	7	/* rescheduling necessary */
103#define TIF_DELAYED_TRACE	14	/* single step a syscall */
104#define TIF_SYSCALL_TRACE	15	/* syscall trace active */
105#define TIF_MEMDIE		16	/* is terminating due to OOM killer */
106#define TIF_RESTORE_SIGMASK	18	/* restore signal mask in do_signal */
107
108#endif	/* _ASM_M68K_THREAD_INFO_H */
109