2 * NiosII low-level thread information
4 * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
5 * Copyright (C) 2004 Microtronix Datacom Ltd.
7 * Based on asm/thread_info_no.h from m68k which is:
9 * Copyright (C) 2002 David Howells <dhowells@redhat.com>
11 * This file is subject to the terms and conditions of the GNU General Public
12 * License. See the file "COPYING" in the main directory of this archive
16 #ifndef _ASM_NIOS2_THREAD_INFO_H
17 #define _ASM_NIOS2_THREAD_INFO_H
22 * Size of the kernel stack for each process.
24 #define THREAD_SIZE_ORDER 1
25 #define THREAD_SIZE 8192 /* 2 * PAGE_SIZE */
34 * low level task data that entry.S needs immediate access to
35 * - this struct should fit entirely inside of one cache line
36 * - this struct shares the supervisor stack pages
37 * - if the contents of this structure are changed, the assembly constants
38 * must also be changed
41 struct task_struct *task; /* main task structure */
42 struct exec_domain *exec_domain; /* execution domain */
43 unsigned long flags; /* low level flags */
44 __u32 cpu; /* current CPU */
45 int preempt_count; /* 0 => preemptable,<0 => BUG */
46 mm_segment_t addr_limit; /* thread address space:
47 0-0x7FFFFFFF for user-thead
48 0-0xFFFFFFFF for kernel-thread
50 struct restart_block restart_block;
55 * macros/functions for gaining access to the thread information structure
57 * preempt_count needs to be 1 initially, until the scheduler is functional.
59 #define INIT_THREAD_INFO(tsk) \
62 .exec_domain = &default_exec_domain, \
65 .preempt_count = INIT_PREEMPT_COUNT, \
66 .addr_limit = KERNEL_DS, \
68 .fn = do_no_restart_syscall, \
72 #define init_thread_info (init_thread_union.thread_info)
73 #define init_stack (init_thread_union.stack)
75 /* how to get the thread information struct from C */
76 static inline struct thread_info *current_thread_info(void)
78 register unsigned long sp asm("sp");
80 return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
82 #endif /* !__ASSEMBLY__ */
85 * thread information flags
86 * - these are process state flags that various assembly files may need to
88 * - pending work-to-be-done flags are in LSW
89 * - other flags in MSW
91 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
92 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
93 #define TIF_SIGPENDING 2 /* signal pending */
94 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
95 #define TIF_MEMDIE 4 /* is terminating due to OOM killer */
96 #define TIF_SECCOMP 5 /* secure computing */
97 #define TIF_SYSCALL_AUDIT 6 /* syscall auditing active */
98 #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
100 #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling
103 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
104 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
105 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
106 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
107 #define _TIF_SECCOMP (1 << TIF_SECCOMP)
108 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
109 #define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
110 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
112 /* work to do on interrupt/exception return */
113 #define _TIF_WORK_MASK 0x0000FFFE
115 /* work to do on any return to u-space */
116 # define _TIF_ALLWORK_MASK 0x0000FFFF
118 #endif /* __KERNEL__ */
120 #endif /* _ASM_NIOS2_THREAD_INFO_H */