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d2912cb1 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
3be80aae VG |
2 | /* |
3 | * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) | |
4 | * | |
3be80aae VG |
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 | ||
3be80aae VG |
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) | |
1f6ccfff | 25 | #define THREAD_SHIFT (PAGE_SHIFT << THREAD_SIZE_ORDER) |
3be80aae VG |
26 | |
27 | #ifndef __ASSEMBLY__ | |
28 | ||
29 | #include <linux/thread_info.h> | |
3be80aae VG |
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 */ | |
fd476197 | 40 | unsigned long ksp; /* kernel mode stack top in __switch_to */ |
ebfc2fd8 | 41 | int preempt_count; /* 0 => preemptible, <0 => BUG */ |
fd476197 | 42 | int cpu; /* current CPU */ |
3be80aae | 43 | unsigned long thr_ptr; /* TLS ptr */ |
fd476197 | 44 | struct task_struct *task; /* main task structure */ |
3be80aae VG |
45 | }; |
46 | ||
47 | /* | |
fd476197 VG |
48 | * initilaize thread_info for any @tsk |
49 | * - this is not related to init_task per se | |
3be80aae VG |
50 | */ |
51 | #define INIT_THREAD_INFO(tsk) \ | |
52 | { \ | |
53 | .task = &tsk, \ | |
3be80aae VG |
54 | .flags = 0, \ |
55 | .cpu = 0, \ | |
56 | .preempt_count = INIT_PREEMPT_COUNT, \ | |
3be80aae VG |
57 | } |
58 | ||
3be80aae VG |
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 | ||
3be80aae VG |
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 */ | |
53855e12 | 79 | #define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */ |
3be80aae | 80 | #define TIF_SYSCALL_TRACE 15 /* syscall trace active */ |
3be80aae VG |
81 | /* true if poll_idle() is polling TIF_NEED_RESCHED */ |
82 | #define TIF_MEMDIE 16 | |
fb0b5490 | 83 | #define TIF_SYSCALL_TRACEPOINT 17 /* syscall tracepoint instrumentation */ |
3be80aae VG |
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) | |
53855e12 | 90 | #define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL) |
3be80aae | 91 | #define _TIF_MEMDIE (1<<TIF_MEMDIE) |
fb0b5490 | 92 | #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) |
3be80aae VG |
93 | |
94 | /* work to do on interrupt/exception return */ | |
95 | #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ | |
53855e12 | 96 | _TIF_NOTIFY_RESUME | _TIF_NOTIFY_SIGNAL) |
3be80aae | 97 | |
fb0b5490 SM |
98 | #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT) |
99 | ||
3be80aae VG |
100 | /* |
101 | * _TIF_ALLWORK_MASK includes SYSCALL_TRACE, but we don't need it. | |
753150ad RD |
102 | * SYSCALL_TRACE is anyway separately/unconditionally tested right after a |
103 | * syscall, so all that remains to be tested is _TIF_WORK_MASK | |
3be80aae VG |
104 | */ |
105 | ||
3be80aae | 106 | #endif /* _ASM_THREAD_INFO_H */ |