1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * thread_info.h: sparc low-level thread information
4 * adapted from the ppc version by Pete Zaitcev, which was
5 * adapted from the i386 version by Paul Mackerras
6 *
7 * Copyright (C) 2002  David Howells (dhowells@redhat.com)
8 * Copyright (c) 2002  Pete Zaitcev (zaitcev@yahoo.com)
9 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
10 */
11
12#ifndef _ASM_THREAD_INFO_H
13#define _ASM_THREAD_INFO_H
14
15#ifdef __KERNEL__
16
17#ifndef __ASSEMBLY__
18
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
28struct thread_info {
29	unsigned long		uwinmask;
30	struct task_struct	*task;		/* main task structure */
31	unsigned long		flags;		/* low level flags */
32	int			cpu;		/* cpu we're on */
33	int			preempt_count;	/* 0 => preemptable,
34						   <0 => BUG */
35	int			softirq_count;
36	int			hardirq_count;
37
38	u32 __unused;
39
40	/* Context switch saved kernel state. */
41	unsigned long ksp;	/* ... ksp __attribute__ ((aligned (8))); */
42	unsigned long kpc;
43	unsigned long kpsr;
44	unsigned long kwim;
45
46	/* A place to store user windows and stack pointers
47	 * when the stack needs inspection.
48	 */
49	struct reg_window32	reg_window[NSWINS];	/* align for ldd! */
50	unsigned long		rwbuf_stkptrs[NSWINS];
51	unsigned long		w_saved;
52};
53
54/*
55 * macros/functions for gaining access to the thread information structure
56 */
57#define INIT_THREAD_INFO(tsk)				\
58{							\
59	.uwinmask	=	0,			\
60	.task		=	&tsk,			\
61	.flags		=	0,			\
62	.cpu		=	0,			\
63	.preempt_count	=	INIT_PREEMPT_COUNT,	\
64}
65
66/* how to get the thread information struct from C */
67register struct thread_info *current_thread_info_reg asm("g6");
68#define current_thread_info()   (current_thread_info_reg)
69
70/*
71 * thread information allocation
72 */
73#define THREAD_SIZE_ORDER  1
74
75#endif /* __ASSEMBLY__ */
76
77/* Size of kernel stack for each process */
78#define THREAD_SIZE		(2 * PAGE_SIZE)
79
80/*
81 * Offsets in thread_info structure, used in assembly code
82 * The "#define REGWIN_SZ 0x40" was abolished, so no multiplications.
83 */
84#define TI_UWINMASK	0x00	/* uwinmask */
85#define TI_TASK		0x04
86#define TI_FLAGS	0x08
87#define TI_CPU		0x0c
88#define TI_PREEMPT	0x10	/* preempt_count */
89#define TI_SOFTIRQ	0x14	/* softirq_count */
90#define TI_HARDIRQ	0x18	/* hardirq_count */
91#define TI_KSP		0x20	/* ksp */
92#define TI_KPC		0x24	/* kpc (ldd'ed with kpc) */
93#define TI_KPSR		0x28	/* kpsr */
94#define TI_KWIM		0x2c	/* kwim (ldd'ed with kpsr) */
95#define TI_REG_WINDOW	0x30
96#define TI_RWIN_SPTRS	0x230
97#define TI_W_SAVED	0x250
98
99/*
100 * thread information flag bit numbers
101 */
102#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
103#define TIF_NOTIFY_RESUME	1	/* callback before returning to user */
104#define TIF_SIGPENDING		2	/* signal pending */
105#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
106#define TIF_RESTORE_SIGMASK	4	/* restore signal mask in do_signal() */
107#define TIF_NOTIFY_SIGNAL	5	/* signal notifications exist */
108#define TIF_USEDFPU		8	/* FPU was used by this task
109					 * this quantum (SMP) */
110#define TIF_POLLING_NRFLAG	9	/* true if poll_idle() is polling
111					 * TIF_NEED_RESCHED */
112#define TIF_MEMDIE		10	/* is terminating due to OOM killer */
113
114/* as above, but as bit values */
115#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
116#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
117#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
118#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
119#define _TIF_NOTIFY_SIGNAL	(1<<TIF_NOTIFY_SIGNAL)
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 | _TIF_NOTIFY_SIGNAL)
125
126#define is_32bit_task()	(1)
127
128#endif /* __KERNEL__ */
129
130#endif /* _ASM_THREAD_INFO_H */
131