1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) 4 * 5 * Vineetg: Oct 2009 6 * No need for ARC specific thread_info allocator (kmalloc/free). This is 7 * anyways one page allocation, thus slab alloc can be short-circuited and 8 * the generic version (get_free_page) would be loads better. 9 * 10 * Sameer Dhavale: Codito Technologies 2004 11 */ 12 13 #ifndef _ASM_THREAD_INFO_H 14 #define _ASM_THREAD_INFO_H 15 16 #include <asm/page.h> 17 18 #ifdef CONFIG_16KSTACKS 19 #define THREAD_SIZE_ORDER 1 20 #else 21 #define THREAD_SIZE_ORDER 0 22 #endif 23 24 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) 25 #define THREAD_SHIFT (PAGE_SHIFT << THREAD_SIZE_ORDER) 26 27 #ifndef __ASSEMBLY__ 28 29 #include <linux/thread_info.h> 30 #include <asm/segment.h> 31 32 /* 33 * low level task data that entry.S needs immediate access to 34 * - this struct should fit entirely inside of one cache line 35 * - this struct shares the supervisor stack pages 36 * - if the contents of this structure are changed, the assembly constants 37 * must also be changed 38 */ 39 struct thread_info { 40 unsigned long flags; /* low level flags */ 41 int preempt_count; /* 0 => preemptable, <0 => BUG */ 42 struct task_struct *task; /* main task structure */ 43 mm_segment_t addr_limit; /* thread address space */ 44 __u32 cpu; /* current CPU */ 45 unsigned long thr_ptr; /* TLS ptr */ 46 }; 47 48 /* 49 * macros/functions for gaining access to the thread information structure 50 * 51 * preempt_count needs to be 1 initially, until the scheduler is functional. 52 */ 53 #define INIT_THREAD_INFO(tsk) \ 54 { \ 55 .task = &tsk, \ 56 .flags = 0, \ 57 .cpu = 0, \ 58 .preempt_count = INIT_PREEMPT_COUNT, \ 59 .addr_limit = KERNEL_DS, \ 60 } 61 62 static inline __attribute_const__ struct thread_info *current_thread_info(void) 63 { 64 register unsigned long sp asm("sp"); 65 return (struct thread_info *)(sp & ~(THREAD_SIZE - 1)); 66 } 67 68 #endif /* !__ASSEMBLY__ */ 69 70 /* 71 * thread information flags 72 * - these are process state flags that various assembly files may need to 73 * access 74 * - pending work-to-be-done flags are in LSW 75 * - other flags in MSW 76 */ 77 #define TIF_RESTORE_SIGMASK 0 /* restore sig mask in do_signal() */ 78 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ 79 #define TIF_SIGPENDING 2 /* signal pending */ 80 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 81 #define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */ 82 #define TIF_SYSCALL_TRACE 15 /* syscall trace active */ 83 84 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 85 #define TIF_MEMDIE 16 86 87 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 88 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 89 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 90 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 91 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 92 #define _TIF_MEMDIE (1<<TIF_MEMDIE) 93 94 /* work to do on interrupt/exception return */ 95 #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ 96 _TIF_NOTIFY_RESUME) 97 98 /* 99 * _TIF_ALLWORK_MASK includes SYSCALL_TRACE, but we don't need it. 100 * SYSCALL_TRACE is anyway seperately/unconditionally tested right after a 101 * syscall, so all that reamins to be tested is _TIF_WORK_MASK 102 */ 103 104 #endif /* _ASM_THREAD_INFO_H */ 105