1 /* thread_info.h: CRIS low-level thread information 2 * 3 * Copyright (C) 2002 David Howells (dhowells@redhat.com) 4 * - Incorporating suggestions made by Linus Torvalds and Dave Miller 5 * 6 * CRIS port by Axis Communications 7 */ 8 9 #ifndef _ASM_THREAD_INFO_H 10 #define _ASM_THREAD_INFO_H 11 12 #ifdef __KERNEL__ 13 14 #ifndef __ASSEMBLY__ 15 #include <asm/types.h> 16 #include <asm/processor.h> 17 #include <arch/thread_info.h> 18 #include <asm/segment.h> 19 #endif 20 21 22 /* 23 * low level task data that entry.S needs immediate access to 24 * - this struct should fit entirely inside of one cache line 25 * - this struct shares the supervisor stack pages 26 * - if the contents of this structure are changed, the assembly constants must also be changed 27 */ 28 #ifndef __ASSEMBLY__ 29 struct thread_info { 30 struct task_struct *task; /* main task structure */ 31 unsigned long flags; /* low level flags */ 32 __u32 cpu; /* current CPU */ 33 int preempt_count; /* 0 => preemptable, <0 => BUG */ 34 __u32 tls; /* TLS for this thread */ 35 36 mm_segment_t addr_limit; /* thread address space: 37 0-0xBFFFFFFF for user-thead 38 0-0xFFFFFFFF for kernel-thread 39 */ 40 __u8 supervisor_stack[0]; 41 }; 42 43 #endif 44 45 /* 46 * macros/functions for gaining access to the thread information structure 47 */ 48 #ifndef __ASSEMBLY__ 49 #define INIT_THREAD_INFO(tsk) \ 50 { \ 51 .task = &tsk, \ 52 .flags = 0, \ 53 .cpu = 0, \ 54 .preempt_count = INIT_PREEMPT_COUNT, \ 55 .addr_limit = KERNEL_DS, \ 56 } 57 58 #define init_thread_info (init_thread_union.thread_info) 59 60 #endif /* !__ASSEMBLY__ */ 61 62 /* 63 * thread information flags 64 * - these are process state flags that various assembly files may need to access 65 * - pending work-to-be-done flags are in LSW 66 * - other flags in MSW 67 */ 68 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 69 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ 70 #define TIF_SIGPENDING 2 /* signal pending */ 71 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 72 #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */ 73 #define TIF_MEMDIE 17 /* is terminating due to OOM killer */ 74 75 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 76 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 77 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 78 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 79 80 #define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */ 81 #define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */ 82 83 #endif /* __KERNEL__ */ 84 85 #endif /* _ASM_THREAD_INFO_H */ 86