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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 | /* * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Vineetg: Oct 2009 * No need for ARC specific thread_info allocator (kmalloc/free). This is * anyways one page allocation, thus slab alloc can be short-circuited and * the generic version (get_free_page) would be loads better. * * Sameer Dhavale: Codito Technologies 2004 */ #ifndef _ASM_THREAD_INFO_H #define _ASM_THREAD_INFO_H #include <asm/page.h> #ifdef CONFIG_16KSTACKS #define THREAD_SIZE_ORDER 1 #else #define THREAD_SIZE_ORDER 0 #endif #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) #ifndef __ASSEMBLY__ #include <linux/thread_info.h> #include <asm/segment.h> /* * low level task data that entry.S needs immediate access to * - this struct should fit entirely inside of one cache line * - this struct shares the supervisor stack pages * - if the contents of this structure are changed, the assembly constants * must also be changed */ struct thread_info { unsigned long flags; /* low level flags */ int preempt_count; /* 0 => preemptable, <0 => BUG */ struct task_struct *task; /* main task structure */ mm_segment_t addr_limit; /* thread address space */ __u32 cpu; /* current CPU */ unsigned long thr_ptr; /* TLS ptr */ }; /* * macros/functions for gaining access to the thread information structure * * preempt_count needs to be 1 initially, until the scheduler is functional. */ #define INIT_THREAD_INFO(tsk) \ { \ .task = &tsk, \ .flags = 0, \ .cpu = 0, \ .preempt_count = INIT_PREEMPT_COUNT, \ .addr_limit = KERNEL_DS, \ } #define init_thread_info (init_thread_union.thread_info) #define init_stack (init_thread_union.stack) static inline __attribute_const__ struct thread_info *current_thread_info(void) { register unsigned long sp asm("sp"); return (struct thread_info *)(sp & ~(THREAD_SIZE - 1)); } #endif /* !__ASSEMBLY__ */ /* * thread information flags * - these are process state flags that various assembly files may need to * access * - pending work-to-be-done flags are in LSW * - other flags in MSW */ #define TIF_RESTORE_SIGMASK 0 /* restore sig mask in do_signal() */ #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ #define TIF_SIGPENDING 2 /* signal pending */ #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ #define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */ #define TIF_SYSCALL_TRACE 15 /* syscall trace active */ /* true if poll_idle() is polling TIF_NEED_RESCHED */ #define TIF_MEMDIE 16 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) #define _TIF_MEMDIE (1<<TIF_MEMDIE) /* work to do on interrupt/exception return */ #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ _TIF_NOTIFY_RESUME) /* * _TIF_ALLWORK_MASK includes SYSCALL_TRACE, but we don't need it. * SYSCALL_TRACE is anways seperately/unconditionally tested right after a * syscall, so all that reamins to be tested is _TIF_WORK_MASK */ #endif /* _ASM_THREAD_INFO_H */ |