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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>
112 lines
3.3 KiB
C
112 lines
3.3 KiB
C
/*
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* NiosII low-level thread information
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*
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* Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
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* Copyright (C) 2004 Microtronix Datacom Ltd.
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*
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* Based on asm/thread_info_no.h from m68k which is:
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*
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* Copyright (C) 2002 David Howells <dhowells@redhat.com>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#ifndef _ASM_NIOS2_THREAD_INFO_H
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#define _ASM_NIOS2_THREAD_INFO_H
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#ifdef __KERNEL__
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/*
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* Size of the kernel stack for each process.
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*/
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#define THREAD_SIZE_ORDER 1
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#define THREAD_SIZE 8192 /* 2 * PAGE_SIZE */
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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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* 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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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 => preemptable,<0 => BUG */
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mm_segment_t addr_limit; /* thread address space:
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0-0x7FFFFFFF for user-thead
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0-0xFFFFFFFF for kernel-thread
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*/
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struct pt_regs *regs;
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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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/* how to get the thread information struct from C */
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static inline 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_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_MEMDIE 4 /* is terminating due to OOM killer */
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#define TIF_SECCOMP 5 /* secure computing */
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#define TIF_SYSCALL_AUDIT 6 /* syscall auditing active */
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#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
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#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling
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TIF_NEED_RESCHED */
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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_SECCOMP (1 << TIF_SECCOMP)
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#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
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#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
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#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
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/* work to do on interrupt/exception return */
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#define _TIF_WORK_MASK 0x0000FFFE
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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 /* _ASM_NIOS2_THREAD_INFO_H */
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