1 /* 2 * NiosII low-level thread information 3 * 4 * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch> 5 * Copyright (C) 2004 Microtronix Datacom Ltd. 6 * 7 * Based on asm/thread_info_no.h from m68k which is: 8 * 9 * Copyright (C) 2002 David Howells <dhowells@redhat.com> 10 * 11 * This file is subject to the terms and conditions of the GNU General Public 12 * License. See the file "COPYING" in the main directory of this archive 13 * for more details. 14 */ 15 16 #ifndef _ASM_NIOS2_THREAD_INFO_H 17 #define _ASM_NIOS2_THREAD_INFO_H 18 19 #ifdef __KERNEL__ 20 21 /* 22 * Size of the kernel stack for each process. 23 */ 24 #define THREAD_SIZE_ORDER 1 25 #define THREAD_SIZE 8192 /* 2 * PAGE_SIZE */ 26 27 #ifndef __ASSEMBLY__ 28 29 /* 30 * low level task data that entry.S needs immediate access to 31 * - this struct should fit entirely inside of one cache line 32 * - this struct shares the supervisor stack pages 33 * - if the contents of this structure are changed, the assembly constants 34 * must also be changed 35 */ 36 struct thread_info { 37 struct task_struct *task; /* main task structure */ 38 unsigned long flags; /* low level flags */ 39 __u32 cpu; /* current CPU */ 40 int preempt_count; /* 0 => preemptable,<0 => BUG */ 41 struct pt_regs *regs; 42 }; 43 44 /* 45 * macros/functions for gaining access to the thread information structure 46 * 47 * preempt_count needs to be 1 initially, until the scheduler is functional. 48 */ 49 #define INIT_THREAD_INFO(tsk) \ 50 { \ 51 .task = &tsk, \ 52 .flags = 0, \ 53 .cpu = 0, \ 54 .preempt_count = INIT_PREEMPT_COUNT, \ 55 } 56 57 /* how to get the thread information struct from C */ 58 static inline struct thread_info *current_thread_info(void) 59 { 60 register unsigned long sp asm("sp"); 61 62 return (struct thread_info *)(sp & ~(THREAD_SIZE - 1)); 63 } 64 #endif /* !__ASSEMBLY__ */ 65 66 /* 67 * thread information flags 68 * - these are process state flags that various assembly files may need to 69 * access 70 * - pending work-to-be-done flags are in LSW 71 * - other flags in MSW 72 */ 73 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 74 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ 75 #define TIF_SIGPENDING 2 /* signal pending */ 76 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 77 #define TIF_MEMDIE 4 /* is terminating due to OOM killer */ 78 #define TIF_SECCOMP 5 /* secure computing */ 79 #define TIF_SYSCALL_AUDIT 6 /* syscall auditing active */ 80 #define TIF_NOTIFY_SIGNAL 7 /* signal notifications exist */ 81 #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */ 82 83 #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling 84 TIF_NEED_RESCHED */ 85 86 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 87 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 88 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 89 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 90 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 91 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 92 #define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL) 93 #define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK) 94 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) 95 96 /* work to do on interrupt/exception return */ 97 #define _TIF_WORK_MASK 0x0000FFFE 98 99 /* work to do on any return to u-space */ 100 # define _TIF_ALLWORK_MASK 0x0000FFFF 101 102 #endif /* __KERNEL__ */ 103 104 #endif /* _ASM_NIOS2_THREAD_INFO_H */ 105