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
27 struct 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 */
69 register 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