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>
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* include/asm-cris/processor.h
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*
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* Copyright (C) 2000, 2001 Axis Communications AB
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*
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* Authors: Bjorn Wesen Initial version
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*
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*/
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#ifndef __ASM_CRIS_PROCESSOR_H
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#define __ASM_CRIS_PROCESSOR_H
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#include <asm/page.h>
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#include <asm/ptrace.h>
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#include <arch/processor.h>
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#include <arch/system.h>
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struct task_struct;
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#define STACK_TOP TASK_SIZE
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#define STACK_TOP_MAX STACK_TOP
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/* This decides where the kernel will search for a free chunk of vm
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* space during mmap's.
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*/
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#define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3))
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/*
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* At user->kernel entry, the pt_regs struct is stacked on the top of the kernel-stack.
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* This macro allows us to find those regs for a task.
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* Notice that subsequent pt_regs stackings, like recursive interrupts occurring while
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* we're in the kernel, won't affect this - only the first user->kernel transition
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* registers are reached by this.
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*/
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#define user_regs(thread_info) (((struct pt_regs *)((unsigned long)(thread_info) + THREAD_SIZE)) - 1)
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/*
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* Dito but for the currently running task
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*/
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#define task_pt_regs(task) user_regs(task_thread_info(task))
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unsigned long get_wchan(struct task_struct *p);
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#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
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/* Free all resources held by a thread. */
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static inline void release_thread(struct task_struct *dead_task)
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{
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/* Nothing needs to be done. */
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}
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#define cpu_relax() barrier()
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void default_idle(void);
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#endif /* __ASM_CRIS_PROCESSOR_H */
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