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/lowcore.h> 35 #include <asm/page.h> 36 #include <asm/processor.h> 37 38 /* 39 * low level task data that entry.S needs immediate access to 40 * - this struct should fit entirely inside of one cache line 41 * - this struct shares the supervisor stack pages 42 * - if the contents of this structure are changed, the assembly constants must also be changed 43 */ 44 struct thread_info { 45 struct task_struct *task; /* main task structure */ 46 struct exec_domain *exec_domain; /* execution domain */ 47 unsigned long flags; /* low level flags */ 48 unsigned int cpu; /* current CPU */ 49 int preempt_count; /* 0 => preemptable, <0 => BUG */ 50 struct restart_block restart_block; 51 unsigned int system_call; 52 __u64 user_timer; 53 __u64 system_timer; 54 unsigned long last_break; /* last breaking-event-address. */ 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 = INIT_PREEMPT_COUNT, \ 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 *) S390_lowcore.thread_info; 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 0 /* inside a system call */ 89 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ 90 #define TIF_SIGPENDING 2 /* signal pending */ 91 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 92 #define TIF_PER_TRAP 6 /* deliver sigtrap on return to user */ 93 #define TIF_MCCK_PENDING 7 /* machine check handling is pending */ 94 #define TIF_SYSCALL_TRACE 8 /* syscall trace active */ 95 #define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */ 96 #define TIF_SECCOMP 10 /* secure computing */ 97 #define TIF_SYSCALL_TRACEPOINT 11 /* syscall tracepoint instrumentation */ 98 #define TIF_SIE 12 /* guest execution active */ 99 #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling 100 TIF_NEED_RESCHED */ 101 #define TIF_31BIT 17 /* 32bit process */ 102 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ 103 #define TIF_RESTORE_SIGMASK 19 /* restore signal mask in do_signal() */ 104 #define TIF_SINGLE_STEP 20 /* This task is single stepped */ 105 106 #define _TIF_SYSCALL (1<<TIF_SYSCALL) 107 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 108 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) 109 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 110 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 111 #define _TIF_PER_TRAP (1<<TIF_PER_TRAP) 112 #define _TIF_MCCK_PENDING (1<<TIF_MCCK_PENDING) 113 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 114 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 115 #define _TIF_SECCOMP (1<<TIF_SECCOMP) 116 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 117 #define _TIF_SIE (1<<TIF_SIE) 118 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 119 #define _TIF_31BIT (1<<TIF_31BIT) 120 #define _TIF_SINGLE_STEP (1<<TIF_SINGLE_STEP) 121 122 #ifdef CONFIG_64BIT 123 #define is_32bit_task() (test_thread_flag(TIF_31BIT)) 124 #else 125 #define is_32bit_task() (1) 126 #endif 127 128 #endif /* __KERNEL__ */ 129 130 #define PREEMPT_ACTIVE 0x4000000 131 132 #endif /* _ASM_THREAD_INFO_H */ 133