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
25typedef struct {
26	unsigned long seg;
27} mm_segment_t;
28
29/*
30 * This is union'd with the "bottom" of the kernel stack.
31 * It keeps track of thread info which is handy for routines
32 * to access quickly.
33 */
34
35struct thread_info {
36	struct task_struct	*task;		/* main task structure */
37	unsigned long		flags;          /* low level flags */
38	__u32                   cpu;            /* current cpu */
39	int                     preempt_count;  /* 0=>preemptible,<0=>BUG */
40	mm_segment_t            addr_limit;     /* segmentation sux */
41	/*
42	 * used for syscalls somehow;
43	 * seems to have a function pointer and four arguments
44	 */
45	/* Points to the current pt_regs frame  */
46	struct pt_regs		*regs;
47	/*
48	 * saved kernel sp at switch_to time;
49	 * not sure if this is used (it's not in the VM model it seems;
50	 * see thread_struct)
51	 */
52	unsigned long		sp;
53};
54
55#else /* !__ASSEMBLY__ */
56
57#include <asm/asm-offsets.h>
58
59#endif  /* __ASSEMBLY__  */
60
61#ifndef __ASSEMBLY__
62
63#define INIT_THREAD_INFO(tsk)                   \
64{                                               \
65	.task           = &tsk,                 \
66	.flags          = 0,                    \
67	.cpu            = 0,                    \
68	.preempt_count  = 1,                    \
69	.addr_limit     = KERNEL_DS,            \
70	.sp = 0,				\
71	.regs = NULL,			\
72}
73
74/* Tacky preprocessor trickery */
75#define	qqstr(s) qstr(s)
76#define qstr(s) #s
77#define QUOTED_THREADINFO_REG qqstr(THREADINFO_REG)
78
79register struct thread_info *__current_thread_info asm(QUOTED_THREADINFO_REG);
80#define current_thread_info()  __current_thread_info
81
82#endif /* __ASSEMBLY__ */
83
84/*
85 * thread information flags
86 * - these are process state flags that various assembly files
87 *   may need to access
88 * - pending work-to-be-done flags are in LSW
89 * - other flags in MSW
90 */
91
92#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
93#define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
94#define TIF_SIGPENDING          2       /* signal pending */
95#define TIF_NEED_RESCHED        3       /* rescheduling necessary */
96#define TIF_SINGLESTEP          4       /* restore ss @ return to usr mode */
97#define TIF_RESTORE_SIGMASK     6       /* restore sig mask in do_signal() */
98#define TIF_NOTIFY_SIGNAL	7       /* signal notifications exist */
99/* true if poll_idle() is polling TIF_NEED_RESCHED */
100#define TIF_MEMDIE              17      /* OOM killer killed process */
101
102#define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
103#define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
104#define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
105#define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
106#define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
107#define _TIF_NOTIFY_SIGNAL	(1 << TIF_NOTIFY_SIGNAL)
108
109/* work to do on interrupt/exception return - All but TIF_SYSCALL_TRACE */
110#define _TIF_WORK_MASK          (0x0000FFFF & ~_TIF_SYSCALL_TRACE)
111
112/* work to do on any return to u-space */
113#define _TIF_ALLWORK_MASK       0x0000FFFF
114
115#endif /* __KERNEL__ */
116
117#endif
118