142 lines
4.2 KiB
C
142 lines
4.2 KiB
C
/*
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* File: include/asm-blackfin/thread_info.h
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* Based on: include/asm-m68knommu/thread_info.h
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* Author: LG Soft India
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* Copyright (C) 2004-2005 Analog Devices Inc.
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* Created: Tue Sep 21 2004
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* Description: Blackfin low-level thread information
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* Modified:
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* Bugs: Enter bugs at http://blackfin.uclinux.org/
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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 as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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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; see the file COPYING.
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* If not, write to the Free Software Foundation,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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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#include <asm/page.h>
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#include <asm/entry.h>
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#include <asm/l1layout.h>
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#include <linux/compiler.h>
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#ifdef __KERNEL__
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/* Thread Align Mask to reach to the top of the stack
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* for any process
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*/
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#define ALIGN_PAGE_MASK 0xffffe000
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/*
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* Size of kernel stack for each process. This must be a power of 2...
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*/
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#define THREAD_SIZE 8192 /* 2 pages */
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#ifndef __ASSEMBLY__
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typedef unsigned long mm_segment_t;
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/*
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* low level task data.
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* If you change this, change the TI_* offsets below to match.
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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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struct exec_domain *exec_domain; /* execution domain */
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unsigned long flags; /* low level flags */
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int cpu; /* cpu we're on */
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int preempt_count; /* 0 => preemptable, <0 => BUG */
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mm_segment_t addr_limit; /* address limit */
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struct restart_block restart_block;
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struct l1_scratch_task_info l1_task_info;
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};
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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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#define INIT_THREAD_INFO(tsk) \
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{ \
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.task = &tsk, \
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.exec_domain = &default_exec_domain, \
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.flags = 0, \
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.cpu = 0, \
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.preempt_count = 1, \
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.restart_block = { \
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.fn = do_no_restart_syscall, \
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}, \
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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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/* 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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__attribute__ ((__const__));
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/* Given a task stack pointer, you can find it's task structure
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* just by masking it to the 8K boundary.
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*/
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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__("%0 = sp;": "=&d"(ti):
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);
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return (struct thread_info *)((long)ti & ~((long)THREAD_SIZE-1));
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}
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/* thread information allocation */
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#define alloc_thread_info(tsk) ((struct thread_info *) \
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__get_free_pages(GFP_KERNEL, 1))
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#define free_thread_info(ti) free_pages((unsigned long) (ti), 1)
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#endif /* __ASSEMBLY__ */
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/*
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* Offsets in thread_info structure, used in assembly code
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*/
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#define TI_TASK 0
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#define TI_EXECDOMAIN 4
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#define TI_FLAGS 8
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#define TI_CPU 12
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#define TI_PREEMPT 16
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#define PREEMPT_ACTIVE 0x4000000
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/*
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* thread information flag bit numbers
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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
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TIF_NEED_RESCHED */
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#define TIF_MEMDIE 4
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#define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */
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#define TIF_FREEZE 6 /* is freezing for suspend */
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/* as above, but as bit values */
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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_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
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#define _TIF_FREEZE (1<<TIF_FREEZE)
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#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
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#endif /* __KERNEL__ */
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#endif /* _ASM_THREAD_INFO_H */
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