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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
4 *
5 * Vineetg: Oct 2009
6 * No need for ARC specific thread_info allocator (kmalloc/free). This is
7 * anyways one page allocation, thus slab alloc can be short-circuited and
8 * the generic version (get_free_page) would be loads better.
9 *
10 * Sameer Dhavale: Codito Technologies 2004
11 */
12
13#ifndef _ASM_THREAD_INFO_H
14#define _ASM_THREAD_INFO_H
15
16#include <asm/page.h>
17
18#ifdef CONFIG_16KSTACKS
19#define THREAD_SIZE_ORDER 1
20#else
21#define THREAD_SIZE_ORDER 0
22#endif
23
24#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
25#define THREAD_SHIFT (PAGE_SHIFT << THREAD_SIZE_ORDER)
26
27#ifndef __ASSEMBLER__
28
29#include <linux/thread_info.h>
30
31/*
32 * low level task data that entry.S needs immediate access to
33 * - this struct should fit entirely inside of one cache line
34 * - this struct shares the supervisor stack pages
35 * - if the contents of this structure are changed, the assembly constants
36 * must also be changed
37 */
38struct thread_info {
39 unsigned long flags; /* low level flags */
40 unsigned long ksp; /* kernel mode stack top in __switch_to */
41 int preempt_count; /* 0 => preemptible, <0 => BUG */
42 int cpu; /* current CPU */
43 unsigned long thr_ptr; /* TLS ptr */
44 struct task_struct *task; /* main task structure */
45};
46
47/*
48 * initilaize thread_info for any @tsk
49 * - this is not related to init_task per se
50 */
51#define INIT_THREAD_INFO(tsk) \
52{ \
53 .task = &tsk, \
54 .flags = 0, \
55 .cpu = 0, \
56 .preempt_count = INIT_PREEMPT_COUNT, \
57}
58
59static inline __attribute_const__ struct thread_info *current_thread_info(void)
60{
61 register unsigned long sp asm("sp");
62 return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
63}
64
65#endif /* !__ASSEMBLER__ */
66
67/*
68 * thread information flags
69 * - these are process state flags that various assembly files may need to
70 * access
71 * - pending work-to-be-done flags are in LSW
72 * - other flags in MSW
73 */
74#define TIF_RESTORE_SIGMASK 0 /* restore sig mask in do_signal() */
75#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
76#define TIF_SIGPENDING 2 /* signal pending */
77#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
78#define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
79#define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */
80#define TIF_SYSCALL_TRACE 15 /* syscall trace active */
81/* true if poll_idle() is polling TIF_NEED_RESCHED */
82#define TIF_MEMDIE 16
83#define TIF_SYSCALL_TRACEPOINT 17 /* syscall tracepoint instrumentation */
84
85#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
86#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
87#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
88#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
89#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
90#define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL)
91#define _TIF_MEMDIE (1<<TIF_MEMDIE)
92#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
93
94/* work to do on interrupt/exception return */
95#define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
96 _TIF_NOTIFY_RESUME | _TIF_NOTIFY_SIGNAL)
97
98#define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT)
99
100/*
101 * _TIF_ALLWORK_MASK includes SYSCALL_TRACE, but we don't need it.
102 * SYSCALL_TRACE is anyway separately/unconditionally tested right after a
103 * syscall, so all that remains to be tested is _TIF_WORK_MASK
104 */
105
106#endif /* _ASM_THREAD_INFO_H */