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1/*
2 * Thread support for the Hexagon architecture
3 *
4 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 and
8 * only version 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA.
19 */
20
21#ifndef _ASM_THREAD_INFO_H
22#define _ASM_THREAD_INFO_H
23
24#ifdef __KERNEL__
25
26#ifndef __ASSEMBLY__
27#include <asm/processor.h>
28#include <asm/registers.h>
29#include <asm/page.h>
30#endif
31
32#define THREAD_SHIFT 12
33#define THREAD_SIZE (1<<THREAD_SHIFT)
34#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
35
36#ifndef __ASSEMBLY__
37
38typedef struct {
39 unsigned long seg;
40} mm_segment_t;
41
42/*
43 * This is union'd with the "bottom" of the kernel stack.
44 * It keeps track of thread info which is handy for routines
45 * to access quickly.
46 */
47
48struct thread_info {
49 struct task_struct *task; /* main task structure */
50 unsigned long flags; /* low level flags */
51 __u32 cpu; /* current cpu */
52 int preempt_count; /* 0=>preemptible,<0=>BUG */
53 mm_segment_t addr_limit; /* segmentation sux */
54 /*
55 * used for syscalls somehow;
56 * seems to have a function pointer and four arguments
57 */
58 /* Points to the current pt_regs frame */
59 struct pt_regs *regs;
60 /*
61 * saved kernel sp at switch_to time;
62 * not sure if this is used (it's not in the VM model it seems;
63 * see thread_struct)
64 */
65 unsigned long sp;
66};
67
68#else /* !__ASSEMBLY__ */
69
70#include <asm/asm-offsets.h>
71
72#endif /* __ASSEMBLY__ */
73
74#ifndef __ASSEMBLY__
75
76#define INIT_THREAD_INFO(tsk) \
77{ \
78 .task = &tsk, \
79 .flags = 0, \
80 .cpu = 0, \
81 .preempt_count = 1, \
82 .addr_limit = KERNEL_DS, \
83 .sp = 0, \
84 .regs = NULL, \
85}
86
87/* Tacky preprocessor trickery */
88#define qqstr(s) qstr(s)
89#define qstr(s) #s
90#define QUOTED_THREADINFO_REG qqstr(THREADINFO_REG)
91
92register struct thread_info *__current_thread_info asm(QUOTED_THREADINFO_REG);
93#define current_thread_info() __current_thread_info
94
95#endif /* __ASSEMBLY__ */
96
97/*
98 * thread information flags
99 * - these are process state flags that various assembly files
100 * may need to access
101 * - pending work-to-be-done flags are in LSW
102 * - other flags in MSW
103 */
104
105#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
106#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
107#define TIF_SIGPENDING 2 /* signal pending */
108#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
109#define TIF_SINGLESTEP 4 /* restore ss @ return to usr mode */
110#define TIF_RESTORE_SIGMASK 6 /* restore sig mask in do_signal() */
111/* true if poll_idle() is polling TIF_NEED_RESCHED */
112#define TIF_MEMDIE 17 /* OOM killer killed process */
113
114#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
115#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
116#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
117#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
118#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
119
120/* work to do on interrupt/exception return - All but TIF_SYSCALL_TRACE */
121#define _TIF_WORK_MASK (0x0000FFFF & ~_TIF_SYSCALL_TRACE)
122
123/* work to do on any return to u-space */
124#define _TIF_ALLWORK_MASK 0x0000FFFF
125
126#endif /* __KERNEL__ */
127
128#endif
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Thread support for the Hexagon architecture
4 *
5 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
6 */
7
8#ifndef _ASM_THREAD_INFO_H
9#define _ASM_THREAD_INFO_H
10
11#ifdef __KERNEL__
12
13#ifndef __ASSEMBLY__
14#include <asm/processor.h>
15#include <asm/registers.h>
16#include <asm/page.h>
17#endif
18
19#define THREAD_SHIFT 12
20#define THREAD_SIZE (1<<THREAD_SHIFT)
21#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
22
23#ifndef __ASSEMBLY__
24
25typedef struct {
26 unsigned long seg;
27} mm_segment_t;
28
29/*
30 * This is union'd with the "bottom" of the kernel stack.
31 * It keeps track of thread info which is handy for routines
32 * to access quickly.
33 */
34
35struct thread_info {
36 struct task_struct *task; /* main task structure */
37 unsigned long flags; /* low level flags */
38 __u32 cpu; /* current cpu */
39 int preempt_count; /* 0=>preemptible,<0=>BUG */
40 mm_segment_t addr_limit; /* segmentation sux */
41 /*
42 * used for syscalls somehow;
43 * seems to have a function pointer and four arguments
44 */
45 /* Points to the current pt_regs frame */
46 struct pt_regs *regs;
47 /*
48 * saved kernel sp at switch_to time;
49 * not sure if this is used (it's not in the VM model it seems;
50 * see thread_struct)
51 */
52 unsigned long sp;
53};
54
55#else /* !__ASSEMBLY__ */
56
57#include <asm/asm-offsets.h>
58
59#endif /* __ASSEMBLY__ */
60
61#ifndef __ASSEMBLY__
62
63#define INIT_THREAD_INFO(tsk) \
64{ \
65 .task = &tsk, \
66 .flags = 0, \
67 .cpu = 0, \
68 .preempt_count = 1, \
69 .addr_limit = KERNEL_DS, \
70 .sp = 0, \
71 .regs = NULL, \
72}
73
74/* Tacky preprocessor trickery */
75#define qqstr(s) qstr(s)
76#define qstr(s) #s
77#define QUOTED_THREADINFO_REG qqstr(THREADINFO_REG)
78
79register struct thread_info *__current_thread_info asm(QUOTED_THREADINFO_REG);
80#define current_thread_info() __current_thread_info
81
82#endif /* __ASSEMBLY__ */
83
84/*
85 * thread information flags
86 * - these are process state flags that various assembly files
87 * may need to access
88 * - pending work-to-be-done flags are in LSW
89 * - other flags in MSW
90 */
91
92#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
93#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
94#define TIF_SIGPENDING 2 /* signal pending */
95#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
96#define TIF_SINGLESTEP 4 /* restore ss @ return to usr mode */
97#define TIF_RESTORE_SIGMASK 6 /* restore sig mask in do_signal() */
98#define TIF_NOTIFY_SIGNAL 7 /* signal notifications exist */
99/* true if poll_idle() is polling TIF_NEED_RESCHED */
100#define TIF_MEMDIE 17 /* OOM killer killed process */
101
102#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
103#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
104#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
105#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
106#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
107#define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL)
108
109/* work to do on interrupt/exception return - All but TIF_SYSCALL_TRACE */
110#define _TIF_WORK_MASK (0x0000FFFF & ~_TIF_SYSCALL_TRACE)
111
112/* work to do on any return to u-space */
113#define _TIF_ALLWORK_MASK 0x0000FFFF
114
115#endif /* __KERNEL__ */
116
117#endif