/* * File: include/asm-blackfin/thread_info.h * Based on: include/asm-m68knommu/thread_info.h * Author: LG Soft India * Copyright (C) 2004-2005 Analog Devices Inc. * Created: Tue Sep 21 2004 * Description: Blackfin low-level thread information * Modified: * Bugs: Enter bugs at http://blackfin.uclinux.org/ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; see the file COPYING. * If not, write to the Free Software Foundation, * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifndef _ASM_THREAD_INFO_H #define _ASM_THREAD_INFO_H #include #include #include #include #ifdef __KERNEL__ /* Thread Align Mask to reach to the top of the stack * for any process */ #define ALIGN_PAGE_MASK 0xffffe000 /* * Size of kernel stack for each process. This must be a power of 2... */ #define THREAD_SIZE_ORDER 1 #define THREAD_SIZE 8192 /* 2 pages */ #define STACK_WARN (THREAD_SIZE/8) #ifndef __ASSEMBLY__ typedef unsigned long mm_segment_t; /* * low level task data. * If you change this, change the TI_* offsets below to match. */ struct thread_info { struct task_struct *task; /* main task structure */ struct exec_domain *exec_domain; /* execution domain */ unsigned long flags; /* low level flags */ int cpu; /* cpu we're on */ int preempt_count; /* 0 => preemptable, <0 => BUG */ mm_segment_t addr_limit; /* address limit */ struct restart_block restart_block; struct l1_scratch_task_info l1_task_info; }; /* * macros/functions for gaining access to the thread information structure */ #define INIT_THREAD_INFO(tsk) \ { \ .task = &tsk, \ .exec_domain = &default_exec_domain, \ .flags = 0, \ .cpu = 0, \ .preempt_count = 1, \ .restart_block = { \ .fn = do_no_restart_syscall, \ }, \ } #define init_thread_info (init_thread_union.thread_info) #define init_stack (init_thread_union.stack) /* Given a task stack pointer, you can find its corresponding * thread_info structure just by masking it to the THREAD_SIZE * boundary (currently 8K as you can see above). */ __attribute_const__ static inline struct thread_info *current_thread_info(void) { struct thread_info *ti; __asm__("%0 = sp;" : "=da"(ti) : ); return (struct thread_info *)((long)ti & ~((long)THREAD_SIZE-1)); } #endif /* __ASSEMBLY__ */ /* * Offsets in thread_info structure, used in assembly code */ #define TI_TASK 0 #define TI_EXECDOMAIN 4 #define TI_FLAGS 8 #define TI_CPU 12 #define TI_PREEMPT 16 #define PREEMPT_ACTIVE 0x4000000 /* * thread information flag bit numbers */ #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ #define TIF_SIGPENDING 1 /* signal pending */ #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ #define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling TIF_NEED_RESCHED */ #define TIF_MEMDIE 4 #define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */ #define TIF_FREEZE 6 /* is freezing for suspend */ /* as above, but as bit values */ #define _TIF_SYSCALL_TRACE (1<