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>
99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
/*
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* Copyright 2004-2010 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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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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#include <asm/entry.h>
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#include <asm/l1layout.h>
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#include <linux/compiler.h>
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#ifdef __KERNEL__
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/* Thread Align Mask to reach to the top of the stack
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* for any process
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*/
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#define ALIGN_PAGE_MASK 0xffffe000
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/*
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* Size of kernel stack for each process. This must be a power of 2...
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*/
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#define THREAD_SIZE_ORDER 1
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#define THREAD_SIZE 8192 /* 2 pages */
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#define STACK_WARN (THREAD_SIZE/8)
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#ifndef __ASSEMBLY__
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typedef unsigned long mm_segment_t;
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/*
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* low level task data.
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* If you change this, change the TI_* offsets below to match.
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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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int cpu; /* cpu we're on */
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int preempt_count; /* 0 => preemptable, <0 => BUG */
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mm_segment_t addr_limit; /* address limit */
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#ifndef CONFIG_SMP
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struct l1_scratch_task_info l1_task_info;
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#endif
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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 = 0, \
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.cpu = 0, \
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.preempt_count = INIT_PREEMPT_COUNT, \
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}
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/* Given a task stack pointer, you can find its corresponding
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* thread_info structure just by masking it to the THREAD_SIZE
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* boundary (currently 8K as you can see above).
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*/
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__attribute_const__
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static inline struct thread_info *current_thread_info(void)
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{
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struct thread_info *ti;
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__asm__("%0 = sp;" : "=da"(ti));
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return (struct thread_info *)((long)ti & ~((long)THREAD_SIZE-1));
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}
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#endif /* __ASSEMBLY__ */
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/*
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* thread information flag bit numbers
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*/
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#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
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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_MEMDIE 4 /* is terminating due to OOM killer */
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#define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */
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#define TIF_IRQ_SYNC 7 /* sync pipeline stage */
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#define TIF_NOTIFY_RESUME 8 /* callback before returning to user */
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#define TIF_SINGLESTEP 9
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/* as above, but as bit values */
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#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
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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_IRQ_SYNC (1<<TIF_IRQ_SYNC)
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#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
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#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
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#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
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#endif /* __KERNEL__ */
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#endif /* _ASM_THREAD_INFO_H */
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