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>
91 lines
2.4 KiB
C
91 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_SCORE_THREAD_INFO_H
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#define _ASM_SCORE_THREAD_INFO_H
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#ifdef __KERNEL__
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#define KU_MASK 0x08
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#define KU_USER 0x08
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#define KU_KERN 0x00
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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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#define THREAD_MASK (THREAD_SIZE - _AC(1,UL))
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#ifndef __ASSEMBLY__
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#include <asm/processor.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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struct task_struct *task; /* main task structure */
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unsigned long flags; /* low level flags */
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unsigned long tp_value; /* thread pointer */
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__u32 cpu; /* current CPU */
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/* 0 => preemptable, < 0 => BUG */
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int preempt_count;
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/*
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* thread address space:
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* 0-0xBFFFFFFF for user-thead
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* 0-0xFFFFFFFF for kernel-thread
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*/
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mm_segment_t addr_limit;
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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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.cpu = 0, \
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.preempt_count = 1, \
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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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register struct thread_info *__current_thread_info __asm__("r28");
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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 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_SIGPENDING 1 /* signal pending */
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#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
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#define TIF_NOTIFY_RESUME 5 /* callback before returning to user */
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#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
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#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
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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_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
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#define _TIF_WORK_MASK (0x0000ffff)
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#endif /* __KERNEL__ */
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#endif /* _ASM_SCORE_THREAD_INFO_H */
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