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 /* 13 * Size of kernel stack for each process 14 */ 15 #ifndef CONFIG_64BIT 16 #define THREAD_ORDER 1 17 #define ASYNC_ORDER 1 18 #else /* CONFIG_64BIT */ 19 #ifndef __SMALL_STACK 20 #define THREAD_ORDER 2 21 #define ASYNC_ORDER 2 22 #else 23 #define THREAD_ORDER 1 24 #define ASYNC_ORDER 1 25 #endif 26 #endif /* CONFIG_64BIT */ 27 28 #define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER) 29 #define ASYNC_SIZE (PAGE_SIZE << ASYNC_ORDER) 30 31 #ifndef __ASSEMBLY__ 32 #include <asm/lowcore.h> 33 #include <asm/page.h> 34 #include <asm/processor.h> 35 36 /* 37 * low level task data that entry.S needs immediate access to 38 * - this struct should fit entirely inside of one cache line 39 * - this struct shares the supervisor stack pages 40 * - if the contents of this structure are changed, the assembly constants must also be changed 41 */ 42 struct thread_info { 43 struct task_struct *task; /* main task structure */ 44 struct exec_domain *exec_domain; /* execution domain */ 45 unsigned long flags; /* low level flags */ 46 unsigned int cpu; /* current CPU */ 47 int preempt_count; /* 0 => preemptable, <0 => BUG */ 48 struct restart_block restart_block; 49 unsigned int system_call; 50 __u64 user_timer; 51 __u64 system_timer; 52 unsigned long last_break; /* last breaking-event-address. */ 53 }; 54 55 /* 56 * macros/functions for gaining access to the thread information structure 57 */ 58 #define INIT_THREAD_INFO(tsk) \ 59 { \ 60 .task = &tsk, \ 61 .exec_domain = &default_exec_domain, \ 62 .flags = 0, \ 63 .cpu = 0, \ 64 .preempt_count = INIT_PREEMPT_COUNT, \ 65 .restart_block = { \ 66 .fn = do_no_restart_syscall, \ 67 }, \ 68 } 69 70 #define init_thread_info (init_thread_union.thread_info) 71 #define init_stack (init_thread_union.stack) 72 73 /* how to get the thread information struct from C */ 74 static inline struct thread_info *current_thread_info(void) 75 { 76 return (struct thread_info *) S390_lowcore.thread_info; 77 } 78 79 #define THREAD_SIZE_ORDER THREAD_ORDER 80 81 #endif 82 83 /* 84 * thread information flags bit numbers 85 */ 86 #define TIF_SYSCALL 0 /* inside a system call */ 87 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ 88 #define TIF_SIGPENDING 2 /* signal pending */ 89 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 90 #define TIF_PER_TRAP 6 /* deliver sigtrap on return to user */ 91 #define TIF_MCCK_PENDING 7 /* machine check handling is pending */ 92 #define TIF_SYSCALL_TRACE 8 /* syscall trace active */ 93 #define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */ 94 #define TIF_SECCOMP 10 /* secure computing */ 95 #define TIF_SYSCALL_TRACEPOINT 11 /* syscall tracepoint instrumentation */ 96 #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling 97 TIF_NEED_RESCHED */ 98 #define TIF_31BIT 17 /* 32bit process */ 99 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ 100 #define TIF_RESTORE_SIGMASK 19 /* restore signal mask in do_signal() */ 101 #define TIF_SINGLE_STEP 20 /* This task is single stepped */ 102 103 #define _TIF_SYSCALL (1<<TIF_SYSCALL) 104 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 105 #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) 106 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 107 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 108 #define _TIF_PER_TRAP (1<<TIF_PER_TRAP) 109 #define _TIF_MCCK_PENDING (1<<TIF_MCCK_PENDING) 110 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 111 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 112 #define _TIF_SECCOMP (1<<TIF_SECCOMP) 113 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 114 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 115 #define _TIF_31BIT (1<<TIF_31BIT) 116 #define _TIF_SINGLE_STEP (1<<TIF_SINGLE_STEP) 117 118 #ifdef CONFIG_64BIT 119 #define is_32bit_task() (test_thread_flag(TIF_31BIT)) 120 #else 121 #define is_32bit_task() (1) 122 #endif 123 124 #define PREEMPT_ACTIVE 0x4000000 125 126 #endif /* _ASM_THREAD_INFO_H */ 127