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98 lines
3.2 KiB
98 lines
3.2 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Copyright (C) 2009 Chen Liqin <[email protected]> |
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* Copyright (C) 2012 Regents of the University of California |
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* Copyright (C) 2017 SiFive |
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*/ |
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#ifndef _ASM_RISCV_THREAD_INFO_H |
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#define _ASM_RISCV_THREAD_INFO_H |
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#include <asm/page.h> |
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#include <linux/const.h> |
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/* thread information allocation */ |
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#ifdef CONFIG_64BIT |
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#define THREAD_SIZE_ORDER (2) |
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#else |
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#define THREAD_SIZE_ORDER (1) |
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#endif |
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#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) |
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#ifndef __ASSEMBLY__ |
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#include <asm/processor.h> |
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#include <asm/csr.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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* - if the members of this struct changes, the assembly constants |
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* in asm-offsets.c must be updated accordingly |
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* - thread_info is included in task_struct at an offset of 0. This means that |
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* tp points to both thread_info and task_struct. |
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*/ |
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struct thread_info { |
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unsigned long flags; /* low level flags */ |
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int preempt_count; /* 0=>preemptible, <0=>BUG */ |
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/* |
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* These stack pointers are overwritten on every system call or |
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* exception. SP is also saved to the stack it can be recovered when |
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* overwritten. |
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*/ |
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long kernel_sp; /* Kernel stack pointer */ |
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long user_sp; /* User stack pointer */ |
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int cpu; |
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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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.flags = 0, \ |
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.preempt_count = INIT_PREEMPT_COUNT, \ |
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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 lowest half-word |
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* - other flags in upper half-word(s) |
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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 /* callback before returning to user */ |
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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_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */ |
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#define TIF_MEMDIE 5 /* is terminating due to OOM killer */ |
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#define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */ |
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#define TIF_SYSCALL_AUDIT 7 /* syscall auditing */ |
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#define TIF_SECCOMP 8 /* syscall secure computing */ |
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#define TIF_NOTIFY_SIGNAL 9 /* signal notifications exist */ |
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#define TIF_UPROBE 10 /* uprobe breakpoint or singlestep */ |
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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_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) |
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#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) |
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#define _TIF_SECCOMP (1 << TIF_SECCOMP) |
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#define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL) |
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#define _TIF_UPROBE (1 << TIF_UPROBE) |
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#define _TIF_WORK_MASK \ |
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(_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | _TIF_NEED_RESCHED | \ |
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_TIF_NOTIFY_SIGNAL | _TIF_UPROBE) |
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#define _TIF_SYSCALL_WORK \ |
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(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT | _TIF_SYSCALL_AUDIT | \ |
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_TIF_SECCOMP) |
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#endif /* _ASM_RISCV_THREAD_INFO_H */
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