aboutsummaryrefslogtreecommitdiff
path: root/include/asm-powerpc/thread_info.h
blob: ab17db79f69d8474cb7b8915c974dbf71b60594e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
/* thread_info.h: PowerPC low-level thread information
 * adapted from the i386 version by Paul Mackerras
 *
 * Copyright (C) 2002  David Howells (dhowells@redhat.com)
 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
 */

#ifndef _ASM_POWERPC_THREAD_INFO_H
#define _ASM_POWERPC_THREAD_INFO_H

#ifdef __KERNEL__

/* We have 8k stacks on ppc32 and 16k on ppc64 */

#ifdef CONFIG_PPC64
#define THREAD_SHIFT		14
#else
#define THREAD_SHIFT		13
#endif

#define THREAD_SIZE		(1 << THREAD_SHIFT)

#ifndef __ASSEMBLY__
#include <linux/config.h>
#include <linux/cache.h>
#include <asm/processor.h>
#include <asm/page.h>
#include <linux/stringify.h>

/*
 * low level task data.
 */
struct thread_info {
	struct task_struct *task;		/* main task structure */
	struct exec_domain *exec_domain;	/* execution domain */
	int		cpu;			/* cpu we're on */
	int		preempt_count;		/* 0 => preemptable,
						   <0 => BUG */
	struct restart_block restart_block;
	/* set by force_successful_syscall_return */
	unsigned char	syscall_noerror;
	/* low level flags - has atomic operations done on it */
	unsigned long	flags ____cacheline_aligned_in_smp;
};

/*
 * macros/functions for gaining access to the thread information structure
 *
 * preempt_count needs to be 1 initially, until the scheduler is functional.
 */
#define INIT_THREAD_INFO(tsk)			\
{						\
	.task =		&tsk,			\
	.exec_domain =	&default_exec_domain,	\
	.cpu =		0,			\
	.preempt_count = 1,			\
	.restart_block = {			\
		.fn = do_no_restart_syscall,	\
	},					\
	.flags =	0,			\
}

#define init_thread_info	(init_thread_union.thread_info)
#define init_stack		(init_thread_union.stack)

/* thread information allocation */

#ifdef CONFIG_DEBUG_STACK_USAGE
#define THREAD_INFO_GFP		GFP_KERNEL | __GFP_ZERO
#else
#define THREAD_INFO_GFP		GFP_KERNEL
#endif

#if THREAD_SHIFT >= PAGE_SHIFT

#define THREAD_ORDER	(THREAD_SHIFT - PAGE_SHIFT)

#define alloc_thread_info(tsk)	\
	((struct thread_info *)__get_free_pages(THREAD_INFO_GFP, THREAD_ORDER))
#define free_thread_info(ti)	free_pages((unsigned long)ti, THREAD_ORDER)

#else /* THREAD_SHIFT < PAGE_SHIFT */

#define alloc_thread_info(tsk)	kmalloc(THREAD_SIZE, THREAD_INFO_GFP)
#define free_thread_info(ti)	kfree(ti)

#endif /* THREAD_SHIFT < PAGE_SHIFT */

#define get_thread_info(ti)	get_task_struct((ti)->task)
#define put_thread_info(ti)	put_task_struct((ti)->task)

/* how to get the thread information struct from C */
static inline struct thread_info *current_thread_info(void)
{
	register unsigned long sp asm("r1");

	/* gcc4, at least, is smart enough to turn this into a single
	 * rlwinm for ppc32 and clrrdi for ppc64 */
	return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
}

#endif /* __ASSEMBLY__ */

#define PREEMPT_ACTIVE		0x10000000

/*
 * thread information flag bit numbers
 */
#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
#define TIF_NOTIFY_RESUME	1	/* resumption notification requested */
#define TIF_SIGPENDING		2	/* signal pending */
#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
#define TIF_POLLING_NRFLAG	4	/* true if poll_idle() is polling
					   TIF_NEED_RESCHED */
#define TIF_32BIT		5	/* 32 bit binary */
/* #define SPARE		6 */
#define TIF_ABI_PENDING		7	/* 32/64 bit switch needed */
#define TIF_SYSCALL_AUDIT	8	/* syscall auditing active */
#define TIF_SINGLESTEP		9	/* singlestepping active */
#define TIF_MEMDIE		10
#define TIF_SECCOMP		11	/* secure computing */

/* as above, but as bit values */
#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
#define _TIF_32BIT		(1<<TIF_32BIT)
/* #define _SPARE		(1<<SPARE) */
#define _TIF_ABI_PENDING	(1<<TIF_ABI_PENDING)
#define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
#define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
#define _TIF_SECCOMP		(1<<TIF_SECCOMP)
#define _TIF_SYSCALL_T_OR_A	(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP)

#define _TIF_USER_WORK_MASK	(_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \
				 _TIF_NEED_RESCHED)

#endif /* __KERNEL__ */

#endif /* _ASM_POWERPC_THREAD_INFO_H */