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
25 /*
26 * This is union'd with the "bottom" of the kernel stack.
27 * It keeps track of thread info which is handy for routines
28 * to access quickly.
29 */
30
31 struct thread_info {
32 struct task_struct *task; /* main task structure */
33 unsigned long flags; /* low level flags */
34 __u32 cpu; /* current cpu */
35 int preempt_count; /* 0=>preemptible,<0=>BUG */
36 /*
37 * used for syscalls somehow;
38 * seems to have a function pointer and four arguments
39 */
40 /* Points to the current pt_regs frame */
41 struct pt_regs *regs;
42 /*
43 * saved kernel sp at switch_to time;
44 * not sure if this is used (it's not in the VM model it seems;
45 * see thread_struct)
46 */
47 unsigned long sp;
48 };
49
50 #else /* !__ASSEMBLY__ */
51
52 #include <asm/asm-offsets.h>
53
54 #endif /* __ASSEMBLY__ */
55
56 #ifndef __ASSEMBLY__
57
58 #define INIT_THREAD_INFO(tsk) \
59 { \
60 .task = &tsk, \
61 .flags = 0, \
62 .cpu = 0, \
63 .preempt_count = 1, \
64 .sp = 0, \
65 .regs = NULL, \
66 }
67
68 /* Tacky preprocessor trickery */
69 #define qqstr(s) qstr(s)
70 #define qstr(s) #s
71 #define QUOTED_THREADINFO_REG qqstr(THREADINFO_REG)
72
73 register struct thread_info *__current_thread_info asm(QUOTED_THREADINFO_REG);
74 #define current_thread_info() __current_thread_info
75
76 #endif /* __ASSEMBLY__ */
77
78 /*
79 * thread information flags
80 * - these are process state flags that various assembly files
81 * may need to access
82 * - pending work-to-be-done flags are in LSW
83 * - other flags in MSW
84 */
85
86 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
87 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
88 #define TIF_SIGPENDING 2 /* signal pending */
89 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
90 #define TIF_SINGLESTEP 4 /* restore ss @ return to usr mode */
91 #define TIF_RESTORE_SIGMASK 6 /* restore sig mask in do_signal() */
92 #define TIF_NOTIFY_SIGNAL 7 /* signal notifications exist */
93 /* true if poll_idle() is polling TIF_NEED_RESCHED */
94 #define TIF_MEMDIE 17 /* OOM killer killed process */
95
96 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
97 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
98 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
99 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
100 #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
101 #define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL)
102
103 /* work to do on interrupt/exception return - All but TIF_SYSCALL_TRACE */
104 #define _TIF_WORK_MASK (0x0000FFFF & ~_TIF_SYSCALL_TRACE)
105
106 /* work to do on any return to u-space */
107 #define _TIF_ALLWORK_MASK 0x0000FFFF
108
109 #endif /* __KERNEL__ */
110
111 #endif
112
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