Merge tag 'arc-5.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc
[linux-2.6-microblaze.git] / arch / openrisc / include / asm / thread_info.h
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * OpenRISC Linux
4  *
5  * Linux architectural port borrowing liberally from similar works of
6  * others.  All original copyrights apply as per the original source
7  * declaration.
8  *
9  * OpenRISC implementation:
10  * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
11  * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
12  * et al.
13  */
14
15 #ifndef _ASM_THREAD_INFO_H
16 #define _ASM_THREAD_INFO_H
17
18 #ifdef __KERNEL__
19
20 #ifndef __ASSEMBLY__
21 #include <asm/types.h>
22 #include <asm/processor.h>
23 #endif
24
25
26 /* THREAD_SIZE is the size of the task_struct/kernel_stack combo.
27  * normally, the stack is found by doing something like p + THREAD_SIZE
28  * in or1k, a page is 8192 bytes, which seems like a sane size
29  */
30
31 #define THREAD_SIZE_ORDER 0
32 #define THREAD_SIZE       (PAGE_SIZE << THREAD_SIZE_ORDER)
33
34 /*
35  * low level task data that entry.S needs immediate access to
36  * - this struct should fit entirely inside of one cache line
37  * - this struct shares the supervisor stack pages
38  * - if the contents of this structure are changed, the assembly constants
39  *   must also be changed
40  */
41 #ifndef __ASSEMBLY__
42
43 typedef unsigned long mm_segment_t;
44
45 struct thread_info {
46         struct task_struct      *task;          /* main task structure */
47         unsigned long           flags;          /* low level flags */
48         __u32                   cpu;            /* current CPU */
49         __s32                   preempt_count; /* 0 => preemptable, <0 => BUG */
50
51         mm_segment_t            addr_limit; /* thread address space:
52                                                0-0x7FFFFFFF for user-thead
53                                                0-0xFFFFFFFF for kernel-thread
54                                              */
55         __u8                    supervisor_stack[0];
56
57         /* saved context data */
58         unsigned long           ksp;
59 };
60 #endif
61
62 /*
63  * macros/functions for gaining access to the thread information structure
64  *
65  * preempt_count needs to be 1 initially, until the scheduler is functional.
66  */
67 #ifndef __ASSEMBLY__
68 #define INIT_THREAD_INFO(tsk)                           \
69 {                                                       \
70         .task           = &tsk,                         \
71         .flags          = 0,                            \
72         .cpu            = 0,                            \
73         .preempt_count  = INIT_PREEMPT_COUNT,           \
74         .addr_limit     = KERNEL_DS,                    \
75         .ksp            = 0,                            \
76 }
77
78 /* how to get the thread information struct from C */
79 register struct thread_info *current_thread_info_reg asm("r10");
80 #define current_thread_info()   (current_thread_info_reg)
81
82 #define get_thread_info(ti) get_task_struct((ti)->task)
83 #define put_thread_info(ti) put_task_struct((ti)->task)
84
85 #endif /* !__ASSEMBLY__ */
86
87 /*
88  * thread information flags
89  *   these are process state flags that various assembly files may need to
90  *   access
91  *   - pending work-to-be-done flags are in LSW
92  *   - other flags in MSW
93  */
94 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
95 #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
96 #define TIF_SIGPENDING          2       /* signal pending */
97 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
98 #define TIF_SINGLESTEP          4       /* restore singlestep on return to user
99                                          * mode
100                                          */
101 #define TIF_NOTIFY_SIGNAL       5       /* signal notifications exist */
102 #define TIF_SYSCALL_TRACEPOINT  8       /* for ftrace syscall instrumentation */
103 #define TIF_RESTORE_SIGMASK     9
104 #define TIF_POLLING_NRFLAG      16      /* true if poll_idle() is polling                                                * TIF_NEED_RESCHED
105                                          */
106 #define TIF_MEMDIE              17
107
108 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
109 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
110 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
111 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
112 #define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
113 #define _TIF_NOTIFY_SIGNAL      (1<<TIF_NOTIFY_SIGNAL)
114 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
115
116
117 /* Work to do when returning from interrupt/exception */
118 /* For OpenRISC, this is anything in the LSW other than syscall trace */
119 #define _TIF_WORK_MASK (0xff & ~(_TIF_SYSCALL_TRACE|_TIF_SINGLESTEP))
120
121 #endif /* __KERNEL__ */
122
123 #endif /* _ASM_THREAD_INFO_H */