1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com>
4 * Copyright (C) 2012 Regents of the University of California
5 * Copyright (C) 2017 SiFive
6 */
7
8 #ifndef _ASM_RISCV_THREAD_INFO_H
9 #define _ASM_RISCV_THREAD_INFO_H
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
18 #ifndef __ASSEMBLY__
19
20 #include <asm/processor.h>
21 #include <asm/csr.h>
22
23 typedef struct {
24 unsigned long seg;
25 } mm_segment_t;
26
27 /*
28 * low level task data that entry.S needs immediate access to
29 * - this struct should fit entirely inside of one cache line
30 * - if the members of this struct changes, the assembly constants
31 * in asm-offsets.c must be updated accordingly
32 * - thread_info is included in task_struct at an offset of 0. This means that
33 * tp points to both thread_info and task_struct.
34 */
35 struct thread_info {
36 unsigned long flags; /* low level flags */
37 int preempt_count; /* 0=>preemptible, <0=>BUG */
38 mm_segment_t addr_limit;
39 /*
40 * These stack pointers are overwritten on every system call or
41 * exception. SP is also saved to the stack it can be recovered when
42 * overwritten.
43 */
44 long kernel_sp; /* Kernel stack pointer */
45 long user_sp; /* User stack pointer */
46 int cpu;
47 };
48
49 /*
50 * macros/functions for gaining access to the thread information structure
51 *
52 * preempt_count needs to be 1 initially, until the scheduler is functional.
53 */
54 #define INIT_THREAD_INFO(tsk) \
55 { \
56 .flags = 0, \
57 .preempt_count = INIT_PREEMPT_COUNT, \
58 .addr_limit = KERNEL_DS, \
59 }
60
61 #endif /* !__ASSEMBLY__ */
62
63 /*
64 * thread information flags
65 * - these are process state flags that various assembly files may need to
66 * access
67 * - pending work-to-be-done flags are in lowest half-word
68 * - other flags in upper half-word(s)
69 */
70 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
71 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
72 #define TIF_SIGPENDING 2 /* signal pending */
73 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
74 #define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */
75 #define TIF_MEMDIE 5 /* is terminating due to OOM killer */
76 #define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */
77 #define TIF_SYSCALL_AUDIT 7 /* syscall auditing */
78
79 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
80 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
81 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
82 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
83 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
84 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
85
86 #define _TIF_WORK_MASK \
87 (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | _TIF_NEED_RESCHED)
88
89 #define _TIF_SYSCALL_WORK \
90 (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT | _TIF_SYSCALL_AUDIT)
91
92 #endif /* _ASM_RISCV_THREAD_INFO_H */