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 29typedef 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 */ 40struct 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#define init_thread_info (init_thread_union.thread_info) 67#define init_stack (init_thread_union.stack) 68 69/* how to get the thread information struct from C */ 70static inline struct thread_info *current_thread_info(void) 71{ 72 register unsigned long sp asm("sp"); 73 74 return (struct thread_info *)(sp & ~(THREAD_SIZE - 1)); 75} 76#endif /* !__ASSEMBLY__ */ 77 78/* 79 * thread information flags 80 * - these are process state flags that various assembly files may need to 81 * access 82 * - pending work-to-be-done flags are in LSW 83 * - other flags in MSW 84 */ 85#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 86#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ 87#define TIF_SIGPENDING 2 /* signal pending */ 88#define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 89#define TIF_MEMDIE 4 /* is terminating due to OOM killer */ 90#define TIF_SECCOMP 5 /* secure computing */ 91#define TIF_SYSCALL_AUDIT 6 /* syscall auditing active */ 92#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */ 93 94#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling 95 TIF_NEED_RESCHED */ 96 97#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 98#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 99#define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 100#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 101#define _TIF_SECCOMP (1 << TIF_SECCOMP) 102#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 103#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK) 104#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) 105 106/* work to do on interrupt/exception return */ 107#define _TIF_WORK_MASK 0x0000FFFE 108 109/* work to do on any return to u-space */ 110# define _TIF_ALLWORK_MASK 0x0000FFFF 111 112#endif /* __KERNEL__ */ 113 114#endif /* _ASM_NIOS2_THREAD_INFO_H */ 115