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113 lines
3.4 KiB
113 lines
3.4 KiB
/* |
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* NiosII low-level thread information |
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* |
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* Copyright (C) 2011 Tobias Klauser <[email protected]> |
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* Copyright (C) 2004 Microtronix Datacom Ltd. |
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* |
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* Based on asm/thread_info_no.h from m68k which is: |
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* |
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* Copyright (C) 2002 David Howells <[email protected]> |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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*/ |
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#ifndef _ASM_NIOS2_THREAD_INFO_H |
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#define _ASM_NIOS2_THREAD_INFO_H |
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#ifdef __KERNEL__ |
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/* |
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* Size of the kernel stack for each process. |
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*/ |
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#define THREAD_SIZE_ORDER 1 |
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#define THREAD_SIZE 8192 /* 2 * PAGE_SIZE */ |
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#ifndef __ASSEMBLY__ |
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typedef struct { |
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unsigned long seg; |
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} mm_segment_t; |
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/* |
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* low level task data that entry.S needs immediate access to |
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* - this struct should fit entirely inside of one cache line |
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* - this struct shares the supervisor stack pages |
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* - if the contents of this structure are changed, the assembly constants |
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* must also be changed |
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*/ |
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struct thread_info { |
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struct task_struct *task; /* main task structure */ |
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unsigned long flags; /* low level flags */ |
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__u32 cpu; /* current CPU */ |
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int preempt_count; /* 0 => preemptable,<0 => BUG */ |
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mm_segment_t addr_limit; /* thread address space: |
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0-0x7FFFFFFF for user-thead |
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0-0xFFFFFFFF for kernel-thread |
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*/ |
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struct pt_regs *regs; |
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}; |
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/* |
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* macros/functions for gaining access to the thread information structure |
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* |
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* preempt_count needs to be 1 initially, until the scheduler is functional. |
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*/ |
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#define INIT_THREAD_INFO(tsk) \ |
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{ \ |
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.task = &tsk, \ |
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.flags = 0, \ |
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.cpu = 0, \ |
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.preempt_count = INIT_PREEMPT_COUNT, \ |
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.addr_limit = KERNEL_DS, \ |
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} |
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/* how to get the thread information struct from C */ |
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static inline struct thread_info *current_thread_info(void) |
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{ |
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register unsigned long sp asm("sp"); |
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return (struct thread_info *)(sp & ~(THREAD_SIZE - 1)); |
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} |
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#endif /* !__ASSEMBLY__ */ |
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/* |
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* thread information flags |
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* - these are process state flags that various assembly files may need to |
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* access |
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* - pending work-to-be-done flags are in LSW |
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* - other flags in MSW |
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*/ |
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#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ |
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#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ |
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#define TIF_SIGPENDING 2 /* signal pending */ |
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#define TIF_NEED_RESCHED 3 /* rescheduling necessary */ |
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#define TIF_MEMDIE 4 /* is terminating due to OOM killer */ |
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#define TIF_SECCOMP 5 /* secure computing */ |
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#define TIF_SYSCALL_AUDIT 6 /* syscall auditing active */ |
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#define TIF_NOTIFY_SIGNAL 7 /* signal notifications exist */ |
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#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */ |
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#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling |
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TIF_NEED_RESCHED */ |
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#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) |
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#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) |
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#define _TIF_SIGPENDING (1 << TIF_SIGPENDING) |
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#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) |
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#define _TIF_SECCOMP (1 << TIF_SECCOMP) |
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#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) |
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#define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL) |
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#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK) |
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#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) |
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/* work to do on interrupt/exception return */ |
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#define _TIF_WORK_MASK 0x0000FFFE |
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/* work to do on any return to u-space */ |
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# define _TIF_ALLWORK_MASK 0x0000FFFF |
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#endif /* __KERNEL__ */ |
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#endif /* _ASM_NIOS2_THREAD_INFO_H */
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