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0500871f21
Construct the init thread stack in the linker script rather than doing it by means of a union so that ia64's init_task.c can be got rid of. The following symbols are then made available from INIT_TASK_DATA() linker script macro: init_thread_union init_stack INIT_TASK_DATA() also expands the region to THREAD_SIZE to accommodate the size of the init stack. init_thread_union is given its own section so that it can be placed into the stack space in the right order. I'm assuming that the ia64 ordering is correct and that the task_struct is first and the thread_info second. Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: Tony Luck <tony.luck@intel.com> Tested-by: Will Deacon <will.deacon@arm.com> (arm64) Tested-by: Palmer Dabbelt <palmer@sifive.com> Acked-by: Thomas Gleixner <tglx@linutronix.de>
93 lines
3.0 KiB
C
93 lines
3.0 KiB
C
/*
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* Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com>
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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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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#define THREAD_SIZE_ORDER (1)
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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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typedef unsigned long mm_segment_t;
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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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mm_segment_t addr_limit;
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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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.addr_limit = KERNEL_DS, \
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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_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_WORK_MASK \
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(_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | _TIF_NEED_RESCHED)
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#endif /* _ASM_RISCV_THREAD_INFO_H */
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