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123 lines
3.7 KiB
123 lines
3.7 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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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 <[email protected]> |
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* Copyright (C) 2010-2011 Jonas Bonn <[email protected]> |
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* et al. |
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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 or1k, 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 = INIT_PREEMPT_COUNT, \ |
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.addr_limit = KERNEL_DS, \ |
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.ksp = 0, \ |
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} |
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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_NOTIFY_SIGNAL 5 /* signal notifications exist */ |
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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_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL) |
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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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