128 lines
3.8 KiB
C
128 lines
3.8 KiB
C
/*
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* OpenRISC Linux
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*
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* Linux architectural port borrowing liberally from similar works of
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* others. All original copyrights apply as per the original source
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* declaration.
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*
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* OpenRISC implementation:
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* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
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* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
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* et al.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef _ASM_THREAD_INFO_H
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#define _ASM_THREAD_INFO_H
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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#include <asm/types.h>
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#include <asm/processor.h>
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#endif
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/* THREAD_SIZE is the size of the task_struct/kernel_stack combo.
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* normally, the stack is found by doing something like p + THREAD_SIZE
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* in or32, a page is 8192 bytes, which seems like a sane size
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*/
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#define THREAD_SIZE_ORDER 0
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#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
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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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#ifndef __ASSEMBLY__
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typedef unsigned long mm_segment_t;
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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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__s32 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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__u8 supervisor_stack[0];
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/* saved context data */
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unsigned long ksp;
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};
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#endif
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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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#ifndef __ASSEMBLY__
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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 = 1, \
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.addr_limit = KERNEL_DS, \
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.ksp = 0, \
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}
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#define init_thread_info (init_thread_union.thread_info)
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/* how to get the thread information struct from C */
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register struct thread_info *current_thread_info_reg asm("r10");
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#define current_thread_info() (current_thread_info_reg)
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#define get_thread_info(ti) get_task_struct((ti)->task)
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#define put_thread_info(ti) put_task_struct((ti)->task)
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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_SINGLESTEP 4 /* restore singlestep on return to user
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* mode
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*/
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#define TIF_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation */
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#define TIF_RESTORE_SIGMASK 9
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#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling * TIF_NEED_RESCHED
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*/
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#define TIF_MEMDIE 17
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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_SINGLESTEP (1<<TIF_SINGLESTEP)
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#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
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/* Work to do when returning from interrupt/exception */
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/* For OpenRISC, this is anything in the LSW other than syscall trace */
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#define _TIF_WORK_MASK (0xff & ~(_TIF_SYSCALL_TRACE|_TIF_SINGLESTEP))
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#endif /* __KERNEL__ */
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#endif /* _ASM_THREAD_INFO_H */
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