forked from Minki/linux
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>
129 lines
3.9 KiB
C
129 lines
3.9 KiB
C
/*
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* Thread support for the Hexagon architecture
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*
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* Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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#ifndef _ASM_THREAD_INFO_H
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#define _ASM_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/registers.h>
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#include <asm/page.h>
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#endif
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#define THREAD_SHIFT 12
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#define THREAD_SIZE (1<<THREAD_SHIFT)
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#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
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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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* This is union'd with the "bottom" of the kernel stack.
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* It keeps track of thread info which is handy for routines
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* to access quickly.
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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=>preemptible,<0=>BUG */
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mm_segment_t addr_limit; /* segmentation sux */
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/*
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* used for syscalls somehow;
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* seems to have a function pointer and four arguments
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*/
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/* Points to the current pt_regs frame */
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struct pt_regs *regs;
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/*
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* saved kernel sp at switch_to time;
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* not sure if this is used (it's not in the VM model it seems;
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* see thread_struct)
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*/
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unsigned long sp;
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};
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#else /* !__ASSEMBLY__ */
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#include <asm/asm-offsets.h>
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#endif /* __ASSEMBLY__ */
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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 = 1, \
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.addr_limit = KERNEL_DS, \
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.sp = 0, \
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.regs = NULL, \
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}
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/* Tacky preprocessor trickery */
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#define qqstr(s) qstr(s)
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#define qstr(s) #s
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#define QUOTED_THREADINFO_REG qqstr(THREADINFO_REG)
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register struct thread_info *__current_thread_info asm(QUOTED_THREADINFO_REG);
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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
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* 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_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_SINGLESTEP 4 /* restore ss @ return to usr mode */
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#define TIF_RESTORE_SIGMASK 6 /* restore sig mask in do_signal() */
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/* true if poll_idle() is polling TIF_NEED_RESCHED */
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#define TIF_MEMDIE 17 /* OOM killer killed process */
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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_SINGLESTEP (1 << TIF_SINGLESTEP)
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/* work to do on interrupt/exception return - All but TIF_SYSCALL_TRACE */
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#define _TIF_WORK_MASK (0x0000FFFF & ~_TIF_SYSCALL_TRACE)
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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
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