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/btfixup.h>
19 #include <asm/ptrace.h>
20 #include <asm/page.h>
21 
22 /*
23  * Low level task data.
24  *
25  * If you change this, change the TI_* offsets below to match.
26  */
27 #define NSWINS 8
28 struct thread_info {
29 	unsigned long		uwinmask;
30 	struct task_struct	*task;		/* main task structure */
31 	struct exec_domain	*exec_domain;	/* execution domain */
32 	unsigned long		flags;		/* low level flags */
33 	int			cpu;		/* cpu we're on */
34 	int			preempt_count;	/* 0 => preemptable,
35 						   <0 => BUG */
36 	int			softirq_count;
37 	int			hardirq_count;
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 	struct restart_block	restart_block;
53 };
54 
55 /*
56  * macros/functions for gaining access to the thread information structure
57  */
58 #define INIT_THREAD_INFO(tsk)				\
59 {							\
60 	.uwinmask	=	0,			\
61 	.task		=	&tsk,			\
62 	.exec_domain	=	&default_exec_domain,	\
63 	.flags		=	0,			\
64 	.cpu		=	0,			\
65 	.preempt_count	=	INIT_PREEMPT_COUNT,	\
66 	.restart_block	= {				\
67 		.fn	=	do_no_restart_syscall,	\
68 	},						\
69 }
70 
71 #define init_thread_info	(init_thread_union.thread_info)
72 #define init_stack		(init_thread_union.stack)
73 
74 /* how to get the thread information struct from C */
75 register struct thread_info *current_thread_info_reg asm("g6");
76 #define current_thread_info()   (current_thread_info_reg)
77 
78 /*
79  * thread information allocation
80  */
81 #define THREAD_INFO_ORDER  1
82 
83 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
84 
85 BTFIXUPDEF_CALL(struct thread_info *, alloc_thread_info, void)
86 #define alloc_thread_info(tsk) BTFIXUP_CALL(alloc_thread_info)()
87 
88 BTFIXUPDEF_CALL(void, free_thread_info, struct thread_info *)
89 #define free_thread_info(ti) BTFIXUP_CALL(free_thread_info)(ti)
90 
91 #endif /* __ASSEMBLY__ */
92 
93 /*
94  * Size of kernel stack for each process.
95  * Observe the order of get_free_pages() in alloc_thread_info().
96  * The sun4 has 8K stack too, because it's short on memory, and 16K is a waste.
97  */
98 #define THREAD_SIZE		8192
99 
100 /*
101  * Offsets in thread_info structure, used in assembly code
102  * The "#define REGWIN_SZ 0x40" was abolished, so no multiplications.
103  */
104 #define TI_UWINMASK	0x00	/* uwinmask */
105 #define TI_TASK		0x04
106 #define TI_EXECDOMAIN	0x08	/* exec_domain */
107 #define TI_FLAGS	0x0c
108 #define TI_CPU		0x10
109 #define TI_PREEMPT	0x14	/* preempt_count */
110 #define TI_SOFTIRQ	0x18	/* softirq_count */
111 #define TI_HARDIRQ	0x1c	/* hardirq_count */
112 #define TI_KSP		0x20	/* ksp */
113 #define TI_KPC		0x24	/* kpc (ldd'ed with kpc) */
114 #define TI_KPSR		0x28	/* kpsr */
115 #define TI_KWIM		0x2c	/* kwim (ldd'ed with kpsr) */
116 #define TI_REG_WINDOW	0x30
117 #define TI_RWIN_SPTRS	0x230
118 #define TI_W_SAVED	0x250
119 /* #define TI_RESTART_BLOCK 0x25n */ /* Nobody cares */
120 
121 #define PREEMPT_ACTIVE		0x4000000
122 
123 /*
124  * thread information flag bit numbers
125  */
126 #define TIF_SYSCALL_TRACE	0	/* syscall trace active */
127 #define TIF_NOTIFY_RESUME	1	/* callback before returning to user */
128 #define TIF_SIGPENDING		2	/* signal pending */
129 #define TIF_NEED_RESCHED	3	/* rescheduling necessary */
130 #define TIF_RESTORE_SIGMASK	4	/* restore signal mask in do_signal() */
131 #define TIF_USEDFPU		8	/* FPU was used by this task
132 					 * this quantum (SMP) */
133 #define TIF_POLLING_NRFLAG	9	/* true if poll_idle() is polling
134 					 * TIF_NEED_RESCHED */
135 #define TIF_MEMDIE		10	/* is terminating due to OOM killer */
136 #define TIF_FREEZE		11	/* is freezing for suspend */
137 
138 /* as above, but as bit values */
139 #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
140 #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
141 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
142 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
143 #define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
144 #define _TIF_USEDFPU		(1<<TIF_USEDFPU)
145 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
146 
147 #define _TIF_DO_NOTIFY_RESUME_MASK	(_TIF_NOTIFY_RESUME | \
148 					 _TIF_SIGPENDING | \
149 					 _TIF_RESTORE_SIGMASK)
150 #define _TIF_FREEZE		(1<<TIF_FREEZE)
151 
152 #endif /* __KERNEL__ */
153 
154 #endif /* _ASM_THREAD_INFO_H */
155