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 struct exec_domain *exec_domain; /* execution domain */ 43 unsigned long flags; /* low level flags */ 44 __u32 cpu; /* current CPU */ 45 int preempt_count; /* 0 => preemptable,<0 => BUG */ 46 mm_segment_t addr_limit; /* thread address space: 47 0-0x7FFFFFFF for user-thead 48 0-0xFFFFFFFF for kernel-thread 49 */ 50 struct restart_block restart_block; 51 struct pt_regs *regs; 52 }; 53 54 /* 55 * macros/functions for gaining access to the thread information structure 56 * 57 * preempt_count needs to be 1 initially, until the scheduler is functional. 58 */ 59 #define INIT_THREAD_INFO(tsk) \ 60 { \ 61 .task = &tsk, \ 62 .exec_domain = &default_exec_domain, \ 63 .flags = 0, \ 64 .cpu = 0, \ 65 .preempt_count = INIT_PREEMPT_COUNT, \ 66 .addr_limit = KERNEL_DS, \ 67 .restart_block = { \ 68 .fn = do_no_restart_syscall, \ 69 }, \ 70 } 71 72 #define init_thread_info (init_thread_union.thread_info) 73 #define init_stack (init_thread_union.stack) 74 75 /* how to get the thread information struct from C */ 76 static inline struct thread_info *current_thread_info(void) 77 { 78 register unsigned long sp asm("sp"); 79 80 return (struct thread_info *)(sp & ~(THREAD_SIZE - 1)); 81 } 82 #endif /* !__ASSEMBLY__ */ 83 84 /* 85 * thread information flags 86 * - these are process state flags that various assembly files may need to 87 * access 88 * - pending work-to-be-done flags are in LSW 89 * - other flags in MSW 90 */ 91 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 92 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ 93 #define TIF_SIGPENDING 2 /* signal pending */ 94 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 95 #define TIF_MEMDIE 4 /* is terminating due to OOM killer */ 96 #define TIF_SECCOMP 5 /* secure computing */ 97 #define TIF_SYSCALL_AUDIT 6 /* syscall auditing active */ 98 #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */ 99 100 #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling 101 TIF_NEED_RESCHED */ 102 103 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 104 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 105 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 106 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 107 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 108 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 109 #define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK) 110 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) 111 112 /* work to do on interrupt/exception return */ 113 #define _TIF_WORK_MASK 0x0000FFFE 114 115 /* work to do on any return to u-space */ 116 # define _TIF_ALLWORK_MASK 0x0000FFFF 117 118 #endif /* __KERNEL__ */ 119 120 #endif /* _ASM_NIOS2_THREAD_INFO_H */ 121