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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>
93 lines
3.0 KiB
C
93 lines
3.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_PARISC_THREAD_INFO_H
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#define _ASM_PARISC_THREAD_INFO_H
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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#include <asm/processor.h>
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#include <asm/special_insns.h>
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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; /* thread_info flags (see TIF_*) */
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mm_segment_t addr_limit; /* user-level address space limit */
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__u32 cpu; /* current CPU */
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int preempt_count; /* 0=premptable, <0=BUG; will also serve as bh-counter */
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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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.addr_limit = KERNEL_DS, \
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.preempt_count = INIT_PREEMPT_COUNT, \
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}
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/* how to get the thread information struct from C */
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#define current_thread_info() ((struct thread_info *)mfctl(30))
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#endif /* !__ASSEMBLY */
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/* thread information allocation */
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#ifdef CONFIG_IRQSTACKS
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#define THREAD_SIZE_ORDER 2 /* PA-RISC requires at least 16k stack */
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#else
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#define THREAD_SIZE_ORDER 3 /* PA-RISC requires at least 32k stack */
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#endif
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/* Be sure to hunt all references to this down when you change the size of
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* the kernel stack */
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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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/*
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* thread information flags
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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_POLLING_NRFLAG 3 /* true if poll_idle() is polling TIF_NEED_RESCHED */
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#define TIF_32BIT 4 /* 32 bit binary */
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#define TIF_MEMDIE 5 /* is terminating due to OOM killer */
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#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
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#define TIF_NOTIFY_RESUME 8 /* callback before returning to user */
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#define TIF_SINGLESTEP 9 /* single stepping? */
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#define TIF_BLOCKSTEP 10 /* branch stepping? */
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#define TIF_SECCOMP 11 /* secure computing */
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#define TIF_SYSCALL_TRACEPOINT 12 /* syscall tracepoint instrumentation */
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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_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
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#define _TIF_32BIT (1 << TIF_32BIT)
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#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
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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_BLOCKSTEP (1 << TIF_BLOCKSTEP)
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#define _TIF_SECCOMP (1 << TIF_SECCOMP)
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#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
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#define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | \
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_TIF_NEED_RESCHED)
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#define _TIF_SYSCALL_TRACE_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
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_TIF_BLOCKSTEP | _TIF_SYSCALL_AUDIT | \
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_TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT)
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#ifdef CONFIG_64BIT
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# ifdef CONFIG_COMPAT
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# define is_32bit_task() (test_thread_flag(TIF_32BIT))
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# else
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# define is_32bit_task() (0)
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# endif
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#else
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# define is_32bit_task() (1)
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#endif
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#endif /* __KERNEL__ */
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#endif /* _ASM_PARISC_THREAD_INFO_H */
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