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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>
108 lines
3.3 KiB
C
108 lines
3.3 KiB
C
/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Vineetg: Oct 2009
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* No need for ARC specific thread_info allocator (kmalloc/free). This is
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* anyways one page allocation, thus slab alloc can be short-circuited and
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* the generic version (get_free_page) would be loads better.
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*
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* Sameer Dhavale: Codito Technologies 2004
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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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#include <asm/page.h>
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#ifdef CONFIG_16KSTACKS
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#define THREAD_SIZE_ORDER 1
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#else
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#define THREAD_SIZE_ORDER 0
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#endif
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#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
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#define THREAD_SHIFT (PAGE_SHIFT << THREAD_SIZE_ORDER)
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#ifndef __ASSEMBLY__
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#include <linux/thread_info.h>
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#include <asm/segment.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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unsigned long flags; /* low level flags */
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int preempt_count; /* 0 => preemptable, <0 => BUG */
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struct task_struct *task; /* main task structure */
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mm_segment_t addr_limit; /* thread address space */
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__u32 cpu; /* current CPU */
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unsigned long thr_ptr; /* TLS ptr */
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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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.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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}
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static inline __attribute_const__ struct thread_info *current_thread_info(void)
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{
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register unsigned long sp asm("sp");
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return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
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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 LSW
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* - other flags in MSW
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*/
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#define TIF_RESTORE_SIGMASK 0 /* restore sig mask in do_signal() */
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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_SYSCALL_AUDIT 4 /* syscall auditing active */
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#define TIF_SYSCALL_TRACE 15 /* syscall trace active */
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/* true if poll_idle() is polling TIF_NEED_RESCHED */
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#define TIF_MEMDIE 16
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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_AUDIT (1<<TIF_SYSCALL_AUDIT)
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#define _TIF_MEMDIE (1<<TIF_MEMDIE)
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/* work to do on interrupt/exception return */
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#define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
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_TIF_NOTIFY_RESUME)
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/*
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* _TIF_ALLWORK_MASK includes SYSCALL_TRACE, but we don't need it.
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* SYSCALL_TRACE is anyway seperately/unconditionally tested right after a
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* syscall, so all that reamins to be tested is _TIF_WORK_MASK
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*/
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#endif /* _ASM_THREAD_INFO_H */
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