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 typedef struct { 30 unsigned long seg; 31 } mm_segment_t; 32 33 /* 34 * low level task data that entry.S needs immediate access to 35 * - this struct should fit entirely inside of one cache line 36 * - this struct shares the supervisor stack pages 37 * - if the contents of this structure are changed, the assembly constants 38 * must also be changed 39 */ 40 struct thread_info { 41 struct task_struct *task; /* main task structure */ 42 unsigned long flags; /* low level flags */ 43 __u32 cpu; /* current CPU */ 44 int preempt_count; /* 0 => preemptable,<0 => BUG */ 45 mm_segment_t addr_limit; /* thread address space: 46 0-0x7FFFFFFF for user-thead 47 0-0xFFFFFFFF for kernel-thread 48 */ 49 struct pt_regs *regs; 50 }; 51 52 /* 53 * macros/functions for gaining access to the thread information structure 54 * 55 * preempt_count needs to be 1 initially, until the scheduler is functional. 56 */ 57 #define INIT_THREAD_INFO(tsk) \ 58 { \ 59 .task = &tsk, \ 60 .flags = 0, \ 61 .cpu = 0, \ 62 .preempt_count = INIT_PREEMPT_COUNT, \ 63 .addr_limit = KERNEL_DS, \ 64 } 65 66 /* how to get the thread information struct from C */ 67 static inline struct thread_info *current_thread_info(void) 68 { 69 register unsigned long sp asm("sp"); 70 71 return (struct thread_info *)(sp & ~(THREAD_SIZE - 1)); 72 } 73 #endif /* !__ASSEMBLY__ */ 74 75 /* 76 * thread information flags 77 * - these are process state flags that various assembly files may need to 78 * access 79 * - pending work-to-be-done flags are in LSW 80 * - other flags in MSW 81 */ 82 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 83 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ 84 #define TIF_SIGPENDING 2 /* signal pending */ 85 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 86 #define TIF_MEMDIE 4 /* is terminating due to OOM killer */ 87 #define TIF_SECCOMP 5 /* secure computing */ 88 #define TIF_SYSCALL_AUDIT 6 /* syscall auditing active */ 89 #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */ 90 91 #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling 92 TIF_NEED_RESCHED */ 93 94 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 95 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 96 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 97 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 98 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 99 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 100 #define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK) 101 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) 102 103 /* work to do on interrupt/exception return */ 104 #define _TIF_WORK_MASK 0x0000FFFE 105 106 /* work to do on any return to u-space */ 107 # define _TIF_ALLWORK_MASK 0x0000FFFF 108 109 #endif /* __KERNEL__ */ 110 111 #endif /* _ASM_NIOS2_THREAD_INFO_H */ 112