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 __ASSEMBLY__
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 */
38 struct thread_info {
39 unsigned long flags; /* low level flags */
40 int preempt_count; /* 0 => preemptable, <0 => BUG */
41 struct task_struct *task; /* main task structure */
42 __u32 cpu; /* current CPU */
43 unsigned long thr_ptr; /* TLS ptr */
44 };
45
46 /*
47 * macros/functions for gaining access to the thread information structure
48 *
49 * preempt_count needs to be 1 initially, until the scheduler is functional.
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
current_thread_info(void)59 static 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 /* !__ASSEMBLY__ */
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 */
107