107 lines
3.6 KiB
C
107 lines
3.6 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* thread_info.h: LoongArch low-level thread information
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*
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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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/processor.h>
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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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unsigned long tp_value; /* thread pointer */
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__u32 cpu; /* current CPU */
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int preempt_count; /* 0 => preemptible, <0 => BUG */
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struct pt_regs *regs;
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unsigned long syscall; /* syscall number */
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unsigned long syscall_work; /* SYSCALL_WORK_ flags */
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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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#define INIT_THREAD_INFO(tsk) \
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{ \
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.task = &tsk, \
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.flags = _TIF_FIXADE, \
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.cpu = 0, \
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.preempt_count = INIT_PREEMPT_COUNT, \
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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 __asm__("$tp");
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static inline struct thread_info *current_thread_info(void)
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{
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return __current_thread_info;
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}
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register unsigned long current_stack_pointer __asm__("$sp");
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#endif /* !__ASSEMBLY__ */
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/* thread information allocation */
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#define THREAD_SIZE SZ_16K
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#define THREAD_MASK (THREAD_SIZE - 1UL)
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#define THREAD_SIZE_ORDER ilog2(THREAD_SIZE / PAGE_SIZE)
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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_SIGPENDING 1 /* signal pending */
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#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
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#define TIF_NOTIFY_RESUME 3 /* callback before returning to user */
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#define TIF_NOTIFY_SIGNAL 4 /* signal notifications exist */
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#define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */
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#define TIF_NOHZ 6 /* in adaptive nohz mode */
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#define TIF_UPROBE 7 /* breakpointed or singlestepping */
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#define TIF_USEDFPU 8 /* FPU was used by this task this quantum (SMP) */
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#define TIF_USEDSIMD 9 /* SIMD has been used this quantum */
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#define TIF_MEMDIE 10 /* is terminating due to OOM killer */
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#define TIF_FIXADE 11 /* Fix address errors in software */
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#define TIF_LOGADE 12 /* Log address errors to syslog */
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#define TIF_32BIT_REGS 13 /* 32-bit general purpose registers */
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#define TIF_32BIT_ADDR 14 /* 32-bit address space */
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#define TIF_LOAD_WATCH 15 /* If set, load watch registers */
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#define TIF_SINGLESTEP 16 /* Single Step */
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#define TIF_LSX_CTX_LIVE 17 /* LSX context must be preserved */
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#define TIF_LASX_CTX_LIVE 18 /* LASX context must be preserved */
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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_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
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#define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL)
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#define _TIF_NOHZ (1<<TIF_NOHZ)
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#define _TIF_UPROBE (1<<TIF_UPROBE)
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#define _TIF_USEDFPU (1<<TIF_USEDFPU)
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#define _TIF_USEDSIMD (1<<TIF_USEDSIMD)
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#define _TIF_FIXADE (1<<TIF_FIXADE)
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#define _TIF_LOGADE (1<<TIF_LOGADE)
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#define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS)
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#define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR)
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#define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH)
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#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
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#define _TIF_LSX_CTX_LIVE (1<<TIF_LSX_CTX_LIVE)
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#define _TIF_LASX_CTX_LIVE (1<<TIF_LASX_CTX_LIVE)
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#endif /* __KERNEL__ */
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#endif /* _ASM_THREAD_INFO_H */
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