1 /* 2 * include/asm-s390/thread_info.h 3 * 4 * S390 version 5 * Copyright (C) IBM Corp. 2002,2006 6 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) 7 */ 8 9 #ifndef _ASM_THREAD_INFO_H 10 #define _ASM_THREAD_INFO_H 11 12 #ifdef __KERNEL__ 13 14 /* 15 * Size of kernel stack for each process 16 */ 17 #ifndef __s390x__ 18 #define THREAD_ORDER 1 19 #define ASYNC_ORDER 1 20 #else /* __s390x__ */ 21 #ifndef __SMALL_STACK 22 #define THREAD_ORDER 2 23 #define ASYNC_ORDER 2 24 #else 25 #define THREAD_ORDER 1 26 #define ASYNC_ORDER 1 27 #endif 28 #endif /* __s390x__ */ 29 30 #define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER) 31 #define ASYNC_SIZE (PAGE_SIZE << ASYNC_ORDER) 32 33 #ifndef __ASSEMBLY__ 34 #include <asm/processor.h> 35 #include <asm/lowcore.h> 36 37 /* 38 * low level task data that entry.S needs immediate access to 39 * - this struct should fit entirely inside of one cache line 40 * - this struct shares the supervisor stack pages 41 * - if the contents of this structure are changed, the assembly constants must also be changed 42 */ 43 struct thread_info { 44 struct task_struct *task; /* main task structure */ 45 struct exec_domain *exec_domain; /* execution domain */ 46 unsigned long flags; /* low level flags */ 47 unsigned int cpu; /* current CPU */ 48 int preempt_count; /* 0 => preemptable, <0 => BUG */ 49 struct restart_block restart_block; 50 }; 51 52 /* 53 * macros/functions for gaining access to the thread information structure 54 */ 55 #define INIT_THREAD_INFO(tsk) \ 56 { \ 57 .task = &tsk, \ 58 .exec_domain = &default_exec_domain, \ 59 .flags = 0, \ 60 .cpu = 0, \ 61 .preempt_count = 1, \ 62 .restart_block = { \ 63 .fn = do_no_restart_syscall, \ 64 }, \ 65 } 66 67 #define init_thread_info (init_thread_union.thread_info) 68 #define init_stack (init_thread_union.stack) 69 70 /* how to get the thread information struct from C */ 71 static inline struct thread_info *current_thread_info(void) 72 { 73 return (struct thread_info *)((*(unsigned long *) __LC_KERNEL_STACK)-THREAD_SIZE); 74 } 75 76 #define THREAD_SIZE_ORDER THREAD_ORDER 77 78 #endif 79 80 /* 81 * thread information flags bit numbers 82 */ 83 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 84 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ 85 #define TIF_SIGPENDING 2 /* signal pending */ 86 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 87 #define TIF_RESTART_SVC 4 /* restart svc with new svc number */ 88 #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ 89 #define TIF_SINGLE_STEP 6 /* deliver sigtrap on return to user */ 90 #define TIF_MCCK_PENDING 7 /* machine check handling is pending */ 91 #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ 92 #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling 93 TIF_NEED_RESCHED */ 94 #define TIF_31BIT 18 /* 32bit process */ 95 #define TIF_MEMDIE 19 96 #define TIF_RESTORE_SIGMASK 20 /* restore signal mask in do_signal() */ 97 #define TIF_FREEZE 21 /* thread is freezing for suspend */ 98 99 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 100 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 101 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) 102 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 103 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 104 #define _TIF_RESTART_SVC (1<<TIF_RESTART_SVC) 105 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 106 #define _TIF_SINGLE_STEP (1<<TIF_SINGLE_STEP) 107 #define _TIF_MCCK_PENDING (1<<TIF_MCCK_PENDING) 108 #define _TIF_USEDFPU (1<<TIF_USEDFPU) 109 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 110 #define _TIF_31BIT (1<<TIF_31BIT) 111 #define _TIF_FREEZE (1<<TIF_FREEZE) 112 113 #endif /* __KERNEL__ */ 114 115 #define PREEMPT_ACTIVE 0x4000000 116 117 #endif /* _ASM_THREAD_INFO_H */ 118