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>
127 lines
3.6 KiB
C
127 lines
3.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_M32R_THREAD_INFO_H
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#define _ASM_M32R_THREAD_INFO_H
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/* thread_info.h: m32r low-level thread information
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*
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* Copyright (C) 2002 David Howells (dhowells@redhat.com)
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* - Incorporating suggestions made by Linus Torvalds and Dave Miller
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* Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
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*/
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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#include <asm/processor.h>
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#endif
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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 must also be changed
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*/
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#ifndef __ASSEMBLY__
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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 status; /* thread-synchronous 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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0-0xBFFFFFFF for user-thread
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0-0xFFFFFFFF for kernel-thread
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*/
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__u8 supervisor_stack[0];
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};
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#endif /* !__ASSEMBLY__ */
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#define THREAD_SIZE (PAGE_SIZE << 1)
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#define THREAD_SIZE_ORDER 1
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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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#ifndef __ASSEMBLY__
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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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struct thread_info *ti;
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__asm__ __volatile__ (
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"ldi %0, #%1 \n\t"
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"and %0, sp \n\t"
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: "=r" (ti) : "i" (~(THREAD_SIZE - 1))
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);
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return ti;
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}
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#define TI_FLAG_FAULT_CODE_SHIFT 28
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static inline void set_thread_fault_code(unsigned int val)
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{
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struct thread_info *ti = current_thread_info();
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ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
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| (val << TI_FLAG_FAULT_CODE_SHIFT);
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}
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static inline unsigned int get_thread_fault_code(void)
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{
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struct thread_info *ti = current_thread_info();
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return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
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}
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#endif
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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 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_SINGLESTEP 3 /* restore singlestep on return to user mode */
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#define TIF_NOTIFY_RESUME 5 /* callback before returning to user */
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#define TIF_RESTORE_SIGMASK 8 /* restore signal mask in do_signal() */
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#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
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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_SINGLESTEP (1<<TIF_SINGLESTEP)
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#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
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#define _TIF_USEDFPU (1<<TIF_USEDFPU)
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#define _TIF_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
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#define _TIF_ALLWORK_MASK (_TIF_WORK_MASK | _TIF_SYSCALL_TRACE)
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/*
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* Thread-synchronous status.
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*
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* This is different from the flags in that nobody else
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* ever touches our thread-synchronous status, so we don't
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* have to worry about atomic accesses.
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*/
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#define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */
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#endif /* __KERNEL__ */
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#endif /* _ASM_M32R_THREAD_INFO_H */
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