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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * linux/arch/unicore32/include/asm/thread_info.h
4 *
5 * Code specific to PKUnity SoC and UniCore ISA
6 *
7 * Copyright (C) 2001-2010 GUAN Xue-tao
8 */
9#ifndef __UNICORE_THREAD_INFO_H__
10#define __UNICORE_THREAD_INFO_H__
11
12#ifdef __KERNEL__
13
14#include <linux/compiler.h>
15#include <asm/fpstate.h>
16
17#define THREAD_SIZE_ORDER 1
18#define THREAD_SIZE 8192
19#define THREAD_START_SP (THREAD_SIZE - 8)
20
21#ifndef __ASSEMBLY__
22
23struct task_struct;
24
25#include <asm/types.h>
26
27typedef struct {
28 unsigned long seg;
29} mm_segment_t;
30
31struct cpu_context_save {
32 __u32 r4;
33 __u32 r5;
34 __u32 r6;
35 __u32 r7;
36 __u32 r8;
37 __u32 r9;
38 __u32 r10;
39 __u32 r11;
40 __u32 r12;
41 __u32 r13;
42 __u32 r14;
43 __u32 r15;
44 __u32 r16;
45 __u32 r17;
46 __u32 r18;
47 __u32 r19;
48 __u32 r20;
49 __u32 r21;
50 __u32 r22;
51 __u32 r23;
52 __u32 r24;
53 __u32 r25;
54 __u32 r26;
55 __u32 fp;
56 __u32 sp;
57 __u32 pc;
58};
59
60/*
61 * low level task data that entry.S needs immediate access to.
62 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
63 */
64struct thread_info {
65 unsigned long flags; /* low level flags */
66 int preempt_count; /* 0 => preemptable */
67 /* <0 => bug */
68 mm_segment_t addr_limit; /* address limit */
69 struct task_struct *task; /* main task structure */
70 __u32 cpu; /* cpu */
71 struct cpu_context_save cpu_context; /* cpu context */
72 __u32 syscall; /* syscall number */
73 __u8 used_cp[16]; /* thread used copro */
74#ifdef CONFIG_UNICORE_FPU_F64
75 struct fp_state fpstate __attribute__((aligned(8)));
76#endif
77};
78
79#define INIT_THREAD_INFO(tsk) \
80{ \
81 .task = &tsk, \
82 .flags = 0, \
83 .preempt_count = INIT_PREEMPT_COUNT, \
84 .addr_limit = KERNEL_DS, \
85}
86
87/*
88 * how to get the thread information struct from C
89 */
90static inline struct thread_info *current_thread_info(void) __attribute_const__;
91
92static inline struct thread_info *current_thread_info(void)
93{
94 register unsigned long sp asm ("sp");
95 return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
96}
97
98#define thread_saved_pc(tsk) \
99 ((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
100#define thread_saved_sp(tsk) \
101 ((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
102#define thread_saved_fp(tsk) \
103 ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
104
105#endif
106
107/*
108 * thread information flags:
109 * TIF_SYSCALL_TRACE - syscall trace active
110 * TIF_SIGPENDING - signal pending
111 * TIF_NEED_RESCHED - rescheduling necessary
112 * TIF_NOTIFY_RESUME - callback before returning to user
113 */
114#define TIF_SIGPENDING 0
115#define TIF_NEED_RESCHED 1
116#define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
117#define TIF_SYSCALL_TRACE 8
118#define TIF_MEMDIE 18
119#define TIF_RESTORE_SIGMASK 20
120
121#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
122#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
123#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
124#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
125
126/*
127 * Change these and you break ASM code in entry-common.S
128 */
129#define _TIF_WORK_MASK \
130 (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
131
132#endif /* __KERNEL__ */
133#endif /* __UNICORE_THREAD_INFO_H__ */