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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) 2006 Atmark Techno, Inc.
4 */
5
6#ifndef _ASM_MICROBLAZE_THREAD_INFO_H
7#define _ASM_MICROBLAZE_THREAD_INFO_H
8
9#ifdef __KERNEL__
10
11/* we have 8k stack */
12#define THREAD_SHIFT 13
13#define THREAD_SIZE (1 << THREAD_SHIFT)
14#define THREAD_SIZE_ORDER 1
15
16#ifndef __ASSEMBLER__
17# include <linux/types.h>
18# include <asm/processor.h>
19
20/*
21 * low level task data that entry.S needs immediate access to
22 * - this struct should fit entirely inside of one cache line
23 * - this struct shares the supervisor stack pages
24 * - if the contents of this structure are changed, the assembly constants
25 * must also be changed
26 */
27
28struct cpu_context {
29 __u32 r1; /* stack pointer */
30 __u32 r2;
31 /* dedicated registers */
32 __u32 r13;
33 __u32 r14;
34 __u32 r15;
35 __u32 r16;
36 __u32 r17;
37 __u32 r18;
38 /* non-volatile registers */
39 __u32 r19;
40 __u32 r20;
41 __u32 r21;
42 __u32 r22;
43 __u32 r23;
44 __u32 r24;
45 __u32 r25;
46 __u32 r26;
47 __u32 r27;
48 __u32 r28;
49 __u32 r29;
50 __u32 r30;
51 /* r31 is used as current task pointer */
52 /* special purpose registers */
53 __u32 msr;
54 __u32 ear;
55 __u32 esr;
56 __u32 fsr;
57};
58
59struct thread_info {
60 struct task_struct *task; /* main task structure */
61 unsigned long flags; /* low level flags */
62 unsigned long status; /* thread-synchronous flags */
63 __u32 cpu; /* current CPU */
64 __s32 preempt_count; /* 0 => preemptable,< 0 => BUG*/
65
66 struct cpu_context cpu_context;
67};
68
69/*
70 * macros/functions for gaining access to the thread information structure
71 */
72#define INIT_THREAD_INFO(tsk) \
73{ \
74 .task = &tsk, \
75 .flags = 0, \
76 .cpu = 0, \
77 .preempt_count = INIT_PREEMPT_COUNT, \
78}
79
80/* how to get the thread information struct from C */
81static inline struct thread_info *current_thread_info(void)
82{
83 register unsigned long sp asm("r1");
84
85 return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
86}
87
88/* thread information allocation */
89#endif /* __ASSEMBLER__ */
90
91/*
92 * thread information flags
93 * - these are process state flags that various assembly files may
94 * need to access
95 * - pending work-to-be-done flags are in LSW
96 * - other flags in MSW
97 */
98#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
99#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
100#define TIF_SIGPENDING 2 /* signal pending */
101#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
102/* restore singlestep on return to user mode */
103#define TIF_SINGLESTEP 4
104#define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */
105#define TIF_MEMDIE 6 /* is terminating due to OOM killer */
106#define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */
107#define TIF_SECCOMP 10 /* secure computing */
108
109/* true if poll_idle() is polling TIF_NEED_RESCHED */
110#define TIF_POLLING_NRFLAG 16
111
112#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
113#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
114#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
115#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
116#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
117#define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL)
118#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
119#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
120#define _TIF_SECCOMP (1 << TIF_SECCOMP)
121
122/* work to do in syscall trace */
123#define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
124 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP)
125
126/* work to do on interrupt/exception return */
127#define _TIF_WORK_MASK 0x0000FFFE
128
129/* work to do on any return to u-space */
130#define _TIF_ALLWORK_MASK 0x0000FFFF
131
132/*
133 * Thread-synchronous status.
134 *
135 * This is different from the flags in that nobody else
136 * ever touches our thread-synchronous status, so we don't
137 * have to worry about atomic accesses.
138 */
139/* FPU was used by this task this quantum (SMP) */
140#define TS_USEDFPU 0x0001
141
142#endif /* __KERNEL__ */
143#endif /* _ASM_MICROBLAZE_THREAD_INFO_H */