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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_SCORE_THREAD_INFO_H
3#define _ASM_SCORE_THREAD_INFO_H
4
5#ifdef __KERNEL__
6
7#define KU_MASK 0x08
8#define KU_USER 0x08
9#define KU_KERN 0x00
10
11#include <asm/page.h>
12#include <linux/const.h>
13
14/* thread information allocation */
15#define THREAD_SIZE_ORDER (1)
16#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
17#define THREAD_MASK (THREAD_SIZE - _AC(1,UL))
18
19#ifndef __ASSEMBLY__
20
21#include <asm/processor.h>
22
23/*
24 * low level task data that entry.S needs immediate access to
25 * - this struct should fit entirely inside of one cache line
26 * - this struct shares the supervisor stack pages
27 * - if the contents of this structure are changed, the assembly constants
28 * must also be changed
29 */
30struct thread_info {
31 struct task_struct *task; /* main task structure */
32 unsigned long flags; /* low level flags */
33 unsigned long tp_value; /* thread pointer */
34 __u32 cpu; /* current CPU */
35
36 /* 0 => preemptable, < 0 => BUG */
37 int preempt_count;
38
39 /*
40 * thread address space:
41 * 0-0xBFFFFFFF for user-thead
42 * 0-0xFFFFFFFF for kernel-thread
43 */
44 mm_segment_t addr_limit;
45 struct pt_regs *regs;
46};
47
48/*
49 * macros/functions for gaining access to the thread information structure
50 *
51 * preempt_count needs to be 1 initially, until the scheduler is functional.
52 */
53#define INIT_THREAD_INFO(tsk) \
54{ \
55 .task = &tsk, \
56 .cpu = 0, \
57 .preempt_count = 1, \
58 .addr_limit = KERNEL_DS, \
59}
60
61#define init_thread_info (init_thread_union.thread_info)
62#define init_stack (init_thread_union.stack)
63
64/* How to get the thread information struct from C. */
65register struct thread_info *__current_thread_info __asm__("r28");
66#define current_thread_info() __current_thread_info
67
68#endif /* !__ASSEMBLY__ */
69
70/*
71 * thread information flags
72 * - these are process state flags that various assembly files may need to
73 * access
74 * - pending work-to-be-done flags are in LSW
75 * - other flags in MSW
76 */
77#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
78#define TIF_SIGPENDING 1 /* signal pending */
79#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
80#define TIF_NOTIFY_RESUME 5 /* callback before returning to user */
81#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
82#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
83
84#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
85#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
86#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
87#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
88
89#define _TIF_WORK_MASK (0x0000ffff)
90
91#endif /* __KERNEL__ */
92
93#endif /* _ASM_SCORE_THREAD_INFO_H */