Linux kernel mirror (for testing)
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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