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 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR 15 16 #ifndef __ASSEMBLY__ 17 #include <asm/types.h> 18 #include <asm/processor.h> 19 #include <arch/thread_info.h> 20 #include <asm/segment.h> 21 #endif 22 23 24 /* 25 * low level task data that entry.S needs immediate access to 26 * - this struct should fit entirely inside of one cache line 27 * - this struct shares the supervisor stack pages 28 * - if the contents of this structure are changed, the assembly constants must also be changed 29 */ 30 #ifndef __ASSEMBLY__ 31 struct thread_info { 32 struct task_struct *task; /* main task structure */ 33 struct exec_domain *exec_domain; /* execution domain */ 34 unsigned long flags; /* low level flags */ 35 __u32 cpu; /* current CPU */ 36 int preempt_count; /* 0 => preemptable, <0 => BUG */ 37 __u32 tls; /* TLS for this thread */ 38 39 mm_segment_t addr_limit; /* thread address space: 40 0-0xBFFFFFFF for user-thead 41 0-0xFFFFFFFF for kernel-thread 42 */ 43 struct restart_block restart_block; 44 __u8 supervisor_stack[0]; 45 }; 46 47 #endif 48 49 #define PREEMPT_ACTIVE 0x10000000 50 51 /* 52 * macros/functions for gaining access to the thread information structure 53 * 54 * preempt_count needs to be 1 initially, until the scheduler is functional. 55 */ 56 #ifndef __ASSEMBLY__ 57 #define INIT_THREAD_INFO(tsk) \ 58 { \ 59 .task = &tsk, \ 60 .exec_domain = &default_exec_domain, \ 61 .flags = 0, \ 62 .cpu = 0, \ 63 .preempt_count = 1, \ 64 .addr_limit = KERNEL_DS, \ 65 .restart_block = { \ 66 .fn = do_no_restart_syscall, \ 67 }, \ 68 } 69 70 #define init_thread_info (init_thread_union.thread_info) 71 72 /* thread information allocation */ 73 #define alloc_thread_info(tsk) ((struct thread_info *) __get_free_pages(GFP_KERNEL,1)) 74 #define free_thread_info(ti) free_pages((unsigned long) (ti), 1) 75 76 #endif /* !__ASSEMBLY__ */ 77 78 /* 79 * thread information flags 80 * - these are process state flags that various assembly files may need to access 81 * - pending work-to-be-done flags are in LSW 82 * - other flags in MSW 83 */ 84 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 85 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ 86 #define TIF_SIGPENDING 2 /* signal pending */ 87 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 88 #define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */ 89 #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */ 90 #define TIF_MEMDIE 17 91 #define TIF_FREEZE 18 /* is freezing for suspend */ 92 93 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 94 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 95 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 96 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 97 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) 98 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 99 #define _TIF_FREEZE (1<<TIF_FREEZE) 100 101 #define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */ 102 #define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */ 103 104 #endif /* __KERNEL__ */ 105 106 #endif /* _ASM_THREAD_INFO_H */ 107