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 struct thread_info {
44 struct task_struct *task; /* main task structure */
45 unsigned long flags; /* low level flags */
46 __u32 cpu; /* current CPU */
47 __s32 preempt_count; /* 0 => preemptable, <0 => BUG */
48
49 __u8 supervisor_stack[0];
50
51 /* saved context data */
52 unsigned long ksp;
53 };
54 #endif
55
56 /*
57 * macros/functions for gaining access to the thread information structure
58 *
59 * preempt_count needs to be 1 initially, until the scheduler is functional.
60 */
61 #ifndef __ASSEMBLY__
62 #define INIT_THREAD_INFO(tsk) \
63 { \
64 .task = &tsk, \
65 .flags = 0, \
66 .cpu = 0, \
67 .preempt_count = INIT_PREEMPT_COUNT, \
68 .ksp = 0, \
69 }
70
71 /* how to get the thread information struct from C */
72 register struct thread_info *current_thread_info_reg asm("r10");
73 #define current_thread_info() (current_thread_info_reg)
74
75 #define get_thread_info(ti) get_task_struct((ti)->task)
76 #define put_thread_info(ti) put_task_struct((ti)->task)
77
78 #endif /* !__ASSEMBLY__ */
79
80 /*
81 * thread information flags
82 * these are process state flags that various assembly files may need to
83 * access
84 * - pending work-to-be-done flags are in LSW
85 * - other flags in MSW
86 */
87 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
88 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
89 #define TIF_SIGPENDING 2 /* signal pending */
90 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
91 #define TIF_SINGLESTEP 4 /* restore singlestep on return to user
92 * mode
93 */
94 #define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */
95 #define TIF_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation */
96 #define TIF_RESTORE_SIGMASK 9
97 #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling * TIF_NEED_RESCHED
98 */
99 #define TIF_MEMDIE 17
100
101 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
102 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
103 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
104 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
105 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
106 #define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL)
107 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
108
109
110 /* Work to do when returning from interrupt/exception */
111 /* For OpenRISC, this is anything in the LSW other than syscall trace */
112 #define _TIF_WORK_MASK (0xff & ~(_TIF_SYSCALL_TRACE|_TIF_SINGLESTEP))
113
114 #endif /* __KERNEL__ */
115
116 #endif /* _ASM_THREAD_INFO_H */
117
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