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 #ifndef __SMALL_STACK 19 #define THREAD_ORDER 1 20 #define ASYNC_ORDER 1 21 #else 22 #define THREAD_ORDER 0 23 #define ASYNC_ORDER 0 24 #endif 25 #else /* __s390x__ */ 26 #ifndef __SMALL_STACK 27 #define THREAD_ORDER 2 28 #define ASYNC_ORDER 2 29 #else 30 #define THREAD_ORDER 1 31 #define ASYNC_ORDER 1 32 #endif 33 #endif /* __s390x__ */ 34 35 #define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER) 36 #define ASYNC_SIZE (PAGE_SIZE << ASYNC_ORDER) 37 38 #ifndef __ASSEMBLY__ 39 #include <asm/processor.h> 40 #include <asm/lowcore.h> 41 42 /* 43 * low level task data that entry.S needs immediate access to 44 * - this struct should fit entirely inside of one cache line 45 * - this struct shares the supervisor stack pages 46 * - if the contents of this structure are changed, the assembly constants must also be changed 47 */ 48 struct thread_info { 49 struct task_struct *task; /* main task structure */ 50 struct exec_domain *exec_domain; /* execution domain */ 51 unsigned long flags; /* low level flags */ 52 unsigned int cpu; /* current CPU */ 53 int preempt_count; /* 0 => preemptable, <0 => BUG */ 54 struct restart_block restart_block; 55 }; 56 57 /* 58 * macros/functions for gaining access to the thread information structure 59 */ 60 #define INIT_THREAD_INFO(tsk) \ 61 { \ 62 .task = &tsk, \ 63 .exec_domain = &default_exec_domain, \ 64 .flags = 0, \ 65 .cpu = 0, \ 66 .preempt_count = 1, \ 67 .restart_block = { \ 68 .fn = do_no_restart_syscall, \ 69 }, \ 70 } 71 72 #define init_thread_info (init_thread_union.thread_info) 73 #define init_stack (init_thread_union.stack) 74 75 /* how to get the thread information struct from C */ 76 static inline struct thread_info *current_thread_info(void) 77 { 78 return (struct thread_info *)((*(unsigned long *) __LC_KERNEL_STACK)-THREAD_SIZE); 79 } 80 81 #define THREAD_SIZE_ORDER THREAD_ORDER 82 83 #endif 84 85 /* 86 * thread information flags bit numbers 87 */ 88 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 89 #define TIF_SIGPENDING 2 /* signal pending */ 90 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 91 #define TIF_RESTART_SVC 4 /* restart svc with new svc number */ 92 #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ 93 #define TIF_SINGLE_STEP 6 /* deliver sigtrap on return to user */ 94 #define TIF_MCCK_PENDING 7 /* machine check handling is pending */ 95 #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ 96 #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling 97 TIF_NEED_RESCHED */ 98 #define TIF_31BIT 18 /* 32bit process */ 99 #define TIF_MEMDIE 19 100 #define TIF_RESTORE_SIGMASK 20 /* restore signal mask in do_signal() */ 101 102 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 103 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) 104 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 105 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 106 #define _TIF_RESTART_SVC (1<<TIF_RESTART_SVC) 107 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 108 #define _TIF_SINGLE_STEP (1<<TIF_SINGLE_STEP) 109 #define _TIF_MCCK_PENDING (1<<TIF_MCCK_PENDING) 110 #define _TIF_USEDFPU (1<<TIF_USEDFPU) 111 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 112 #define _TIF_31BIT (1<<TIF_31BIT) 113 114 #endif /* __KERNEL__ */ 115 116 #define PREEMPT_ACTIVE 0x4000000 117 118 #endif /* _ASM_THREAD_INFO_H */ 119