132 lines
4.0 KiB
C
132 lines
4.0 KiB
C
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/*
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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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#define init_thread_info (init_thread_union.thread_info)
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#define init_stack (init_thread_union.stack)
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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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