1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Thread support for the Hexagon architecture
4 *
5 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
6 */
7
8#ifndef _ASM_THREAD_INFO_H
9#define _ASM_THREAD_INFO_H
10
11#ifdef __KERNEL__
12
13#ifndef __ASSEMBLY__
14#include <asm/processor.h>
15#include <asm/registers.h>
16#include <asm/page.h>
17#endif
18
19#define THREAD_SHIFT		12
20#define THREAD_SIZE		(1<<THREAD_SHIFT)
21#define THREAD_SIZE_ORDER	(THREAD_SHIFT - PAGE_SHIFT)
22
23#ifndef __ASSEMBLY__
24
25/*
26 * This is union'd with the "bottom" of the kernel stack.
27 * It keeps track of thread info which is handy for routines
28 * to access quickly.
29 */
30
31struct thread_info {
32	struct task_struct	*task;		/* main task structure */
33	unsigned long		flags;          /* low level flags */
34	__u32                   cpu;            /* current cpu */
35	int                     preempt_count;  /* 0=>preemptible,<0=>BUG */
36	/*
37	 * used for syscalls somehow;
38	 * seems to have a function pointer and four arguments
39	 */
40	/* Points to the current pt_regs frame  */
41	struct pt_regs		*regs;
42	/*
43	 * saved kernel sp at switch_to time;
44	 * not sure if this is used (it's not in the VM model it seems;
45	 * see thread_struct)
46	 */
47	unsigned long		sp;
48};
49
50#else /* !__ASSEMBLY__ */
51
52#include <asm/asm-offsets.h>
53
54#endif  /* __ASSEMBLY__  */
55
56#ifndef __ASSEMBLY__
57
58#define INIT_THREAD_INFO(tsk)                   \
59{                                               \
60	.task           = &tsk,                 \
61	.flags          = 0,                    \
62	.cpu            = 0,                    \
63	.preempt_count  = 1,                    \
64	.sp = 0,				\
65	.regs = NULL,			\
66}
67
68/* Tacky preprocessor trickery */
69#define	qqstr(s) qstr(s)
70#define qstr(s) #s
71#define QUOTED_THREADINFO_REG qqstr(THREADINFO_REG)
72
73register struct thread_info *__current_thread_info asm(QUOTED_THREADINFO_REG);
74#define current_thread_info()  __current_thread_info
75
76#endif /* __ASSEMBLY__ */
77
78/*
79 * thread information flags
80 * - these are process state flags that various assembly files
81 *   may need to access
82 * - pending work-to-be-done flags are in LSW
83 * - other flags in MSW
84 */
85
86#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
87#define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
88#define TIF_SIGPENDING          2       /* signal pending */
89#define TIF_NEED_RESCHED        3       /* rescheduling necessary */
90#define TIF_SINGLESTEP          4       /* restore ss @ return to usr mode */
91#define TIF_RESTORE_SIGMASK     6       /* restore sig mask in do_signal() */
92#define TIF_NOTIFY_SIGNAL	7       /* signal notifications exist */
93/* true if poll_idle() is polling TIF_NEED_RESCHED */
94#define TIF_MEMDIE              17      /* OOM killer killed process */
95
96#define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
97#define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
98#define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
99#define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
100#define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
101#define _TIF_NOTIFY_SIGNAL	(1 << TIF_NOTIFY_SIGNAL)
102
103/* work to do on interrupt/exception return - All but TIF_SYSCALL_TRACE */
104#define _TIF_WORK_MASK          (0x0000FFFF & ~_TIF_SYSCALL_TRACE)
105
106/* work to do on any return to u-space */
107#define _TIF_ALLWORK_MASK       0x0000FFFF
108
109#endif /* __KERNEL__ */
110
111#endif
112