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117 lines
3.4 KiB
117 lines
3.4 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Thread support for the Hexagon architecture |
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* |
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* Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. |
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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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#include <asm/registers.h> |
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#include <asm/page.h> |
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#endif |
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#define THREAD_SHIFT 12 |
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#define THREAD_SIZE (1<<THREAD_SHIFT) |
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#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) |
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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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* This is union'd with the "bottom" of the kernel stack. |
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* It keeps track of thread info which is handy for routines |
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* to access quickly. |
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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=>preemptible,<0=>BUG */ |
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mm_segment_t addr_limit; /* segmentation sux */ |
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/* |
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* used for syscalls somehow; |
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* seems to have a function pointer and four arguments |
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*/ |
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/* Points to the current pt_regs frame */ |
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struct pt_regs *regs; |
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/* |
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* saved kernel sp at switch_to time; |
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* not sure if this is used (it's not in the VM model it seems; |
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* see thread_struct) |
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*/ |
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unsigned long sp; |
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}; |
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#else /* !__ASSEMBLY__ */ |
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#include <asm/asm-offsets.h> |
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#endif /* __ASSEMBLY__ */ |
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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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.sp = 0, \ |
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.regs = NULL, \ |
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} |
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/* Tacky preprocessor trickery */ |
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#define qqstr(s) qstr(s) |
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#define qstr(s) #s |
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#define QUOTED_THREADINFO_REG qqstr(THREADINFO_REG) |
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register struct thread_info *__current_thread_info asm(QUOTED_THREADINFO_REG); |
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#define current_thread_info() __current_thread_info |
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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 |
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* may need to 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 ss @ return to usr mode */ |
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#define TIF_RESTORE_SIGMASK 6 /* restore sig mask in do_signal() */ |
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#define TIF_NOTIFY_SIGNAL 7 /* signal notifications exist */ |
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/* true if poll_idle() is polling TIF_NEED_RESCHED */ |
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#define TIF_MEMDIE 17 /* OOM killer killed process */ |
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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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/* work to do on interrupt/exception return - All but TIF_SYSCALL_TRACE */ |
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#define _TIF_WORK_MASK (0x0000FFFF & ~_TIF_SYSCALL_TRACE) |
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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
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