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 struct exec_domain *exec_domain; /* execution domain */ 32 unsigned long flags; /* low level flags */ 33 __u32 cpu; /* current CPU */ 34 int preempt_count; /* 0 => preemptable, <0 => BUG */ 35 __u32 tls; /* TLS for this thread */ 36 37 mm_segment_t addr_limit; /* thread address space: 38 0-0xBFFFFFFF for user-thead 39 0-0xFFFFFFFF for kernel-thread 40 */ 41 struct restart_block restart_block; 42 __u8 supervisor_stack[0]; 43 }; 44 45 #endif 46 47 #define PREEMPT_ACTIVE 0x10000000 48 49 /* 50 * macros/functions for gaining access to the thread information structure 51 */ 52 #ifndef __ASSEMBLY__ 53 #define INIT_THREAD_INFO(tsk) \ 54 { \ 55 .task = &tsk, \ 56 .exec_domain = &default_exec_domain, \ 57 .flags = 0, \ 58 .cpu = 0, \ 59 .preempt_count = INIT_PREEMPT_COUNT, \ 60 .addr_limit = KERNEL_DS, \ 61 .restart_block = { \ 62 .fn = do_no_restart_syscall, \ 63 }, \ 64 } 65 66 #define init_thread_info (init_thread_union.thread_info) 67 68 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR 69 /* thread information allocation */ 70 #define alloc_thread_info_node(tsk, node) \ 71 ((struct thread_info *) __get_free_pages(GFP_KERNEL, 1)) 72 #define free_thread_info(ti) free_pages((unsigned long) (ti), 1) 73 74 #endif /* !__ASSEMBLY__ */ 75 76 /* 77 * thread information flags 78 * - these are process state flags that various assembly files may need to access 79 * - pending work-to-be-done flags are in LSW 80 * - other flags in MSW 81 */ 82 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 83 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ 84 #define TIF_SIGPENDING 2 /* signal pending */ 85 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 86 #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */ 87 #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 88 #define TIF_MEMDIE 17 /* is terminating due to OOM killer */ 89 90 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 91 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 92 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 93 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 94 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) 95 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 96 97 #define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */ 98 #define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */ 99 100 #endif /* __KERNEL__ */ 101 102 #endif /* _ASM_THREAD_INFO_H */ 103