1/*
2 * thread_info.h: sparc low-level thread information
3 * adapted from the ppc version by Pete Zaitcev, which was
4 * adapted from the i386 version by Paul Mackerras
5 *
6 * Copyright (C) 2002  David Howells (dhowells@redhat.com)
7 * Copyright (c) 2002  Pete Zaitcev (zaitcev@yahoo.com)
8 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
9 */
10
11#ifndef _ASM_THREAD_INFO_H
12#define _ASM_THREAD_INFO_H
13
14#ifdef __KERNEL__
15
16#ifndef __ASSEMBLY__
17
18#include <asm/ptrace.h>
19#include <asm/page.h>
20
21/*
22 * Low level task data.
23 *
24 * If you change this, change the TI_* offsets below to match.
25 */
26#define NSWINS 8
27struct thread_info {
28	unsigned long		uwinmask;
29	struct task_struct	*task;		/* main task structure */
30	unsigned long		flags;		/* low level flags */
31	int			cpu;		/* cpu we're on */
32	int			preempt_count;	/* 0 => preemptable,
33						   <0 => BUG */
34	int			softirq_count;
35	int			hardirq_count;
36
37	u32 __unused;
38
39	/* Context switch saved kernel state. */
40	unsigned long ksp;	/* ... ksp __attribute__ ((aligned (8))); */
41	unsigned long kpc;
42	unsigned long kpsr;
43	unsigned long kwim;
44
45	/* A place to store user windows and stack pointers
46	 * when the stack needs inspection.
47	 */
48	struct reg_window32	reg_window[NSWINS];	/* align for ldd! */
49	unsigned long		rwbuf_stkptrs[NSWINS];
50	unsigned long		w_saved;
51};
52
53/*
54 * macros/functions for gaining access to the thread information structure
55 */
56#define INIT_THREAD_INFO(tsk)				\
57{							\
58	.uwinmask	=	0,			\
59	.task		=	&tsk,			\
60	.flags		=	0,			\
61	.cpu		=	0,			\
62	.preempt_count	=	INIT_PREEMPT_COUNT,	\
63}
64
65#define init_thread_info	(init_thread_union.thread_info)
66#define init_stack		(init_thread_union.stack)
67
68/* how to get the thread information struct from C */
69register struct thread_info *current_thread_info_reg asm("g6");
70#define current_thread_info()   (current_thread_info_reg)
71
72/*
73 * thread information allocation
74 */
75#define THREAD_SIZE_ORDER  1
76
77#endif /* __ASSEMBLY__ */
78
79/* Size of kernel stack for each process */
80#define THREAD_SIZE		(2 * PAGE_SIZE)
81
82/*
83 * Offsets in thread_info structure, used in assembly code
84 * The "#define REGWIN_SZ 0x40" was abolished, so no multiplications.
85 */
86#define TI_UWINMASK	0x00	/* uwinmask */
87#define TI_TASK		0x04
88#define TI_FLAGS	0x08
89#define TI_CPU		0x0c
90#define TI_PREEMPT	0x10	/* preempt_count */
91#define TI_SOFTIRQ	0x14	/* softirq_count */
92#define TI_HARDIRQ	0x18	/* hardirq_count */
93#define TI_KSP		0x20	/* ksp */
94#define TI_KPC		0x24	/* kpc (ldd'ed with kpc) */
95#define TI_KPSR		0x28	/* kpsr */
96#define TI_KWIM		0x2c	/* kwim (ldd'ed with kpsr) */
97#define TI_REG_WINDOW	0x30
98#define TI_RWIN_SPTRS	0x230
99#define TI_W_SAVED	0x250
100
101/*
102 * thread information flag bit numbers
103 */
104#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
105#define TIF_NOTIFY_RESUME	1	/* callback before returning to user */
106#define TIF_SIGPENDING		2	/* signal pending */
107#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
108#define TIF_RESTORE_SIGMASK	4	/* restore signal mask in do_signal() */
109#define TIF_USEDFPU		8	/* FPU was used by this task
110					 * this quantum (SMP) */
111#define TIF_POLLING_NRFLAG	9	/* true if poll_idle() is polling
112					 * TIF_NEED_RESCHED */
113#define TIF_MEMDIE		10	/* is terminating due to OOM killer */
114
115/* as above, but as bit values */
116#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
117#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
118#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
119#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
120#define _TIF_USEDFPU		(1<<TIF_USEDFPU)
121#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
122
123#define _TIF_DO_NOTIFY_RESUME_MASK	(_TIF_NOTIFY_RESUME | \
124					 _TIF_SIGPENDING)
125
126#define is_32bit_task()	(1)
127
128#endif /* __KERNEL__ */
129
130#endif /* _ASM_THREAD_INFO_H */
131