1 /* 2 * S390 version 3 * Copyright IBM Corp. 2002, 2006 4 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) 5 */ 6 7 #ifndef _ASM_THREAD_INFO_H 8 #define _ASM_THREAD_INFO_H 9 10 /* 11 * Size of kernel stack for each process 12 */ 13 #ifndef CONFIG_64BIT 14 #define THREAD_ORDER 1 15 #define ASYNC_ORDER 1 16 #else /* CONFIG_64BIT */ 17 #ifndef __SMALL_STACK 18 #define THREAD_ORDER 2 19 #define ASYNC_ORDER 2 20 #else 21 #define THREAD_ORDER 1 22 #define ASYNC_ORDER 1 23 #endif 24 #endif /* CONFIG_64BIT */ 25 26 #define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER) 27 #define ASYNC_SIZE (PAGE_SIZE << ASYNC_ORDER) 28 29 #ifndef __ASSEMBLY__ 30 #include <asm/lowcore.h> 31 #include <asm/page.h> 32 #include <asm/processor.h> 33 34 /* 35 * low level task data that entry.S needs immediate access to 36 * - this struct should fit entirely inside of one cache line 37 * - this struct shares the supervisor stack pages 38 * - if the contents of this structure are changed, the assembly constants must also be changed 39 */ 40 struct thread_info { 41 struct task_struct *task; /* main task structure */ 42 struct exec_domain *exec_domain; /* execution domain */ 43 unsigned long flags; /* low level flags */ 44 unsigned int cpu; /* current CPU */ 45 int preempt_count; /* 0 => preemptable, <0 => BUG */ 46 struct restart_block restart_block; 47 unsigned int system_call; 48 __u64 user_timer; 49 __u64 system_timer; 50 unsigned long last_break; /* last breaking-event-address. */ 51 }; 52 53 /* 54 * macros/functions for gaining access to the thread information structure 55 */ 56 #define INIT_THREAD_INFO(tsk) \ 57 { \ 58 .task = &tsk, \ 59 .exec_domain = &default_exec_domain, \ 60 .flags = 0, \ 61 .cpu = 0, \ 62 .preempt_count = INIT_PREEMPT_COUNT, \ 63 .restart_block = { \ 64 .fn = do_no_restart_syscall, \ 65 }, \ 66 } 67 68 #define init_thread_info (init_thread_union.thread_info) 69 #define init_stack (init_thread_union.stack) 70 71 /* how to get the thread information struct from C */ 72 static inline struct thread_info *current_thread_info(void) 73 { 74 return (struct thread_info *) S390_lowcore.thread_info; 75 } 76 77 #define THREAD_SIZE_ORDER THREAD_ORDER 78 79 #endif 80 81 /* 82 * thread information flags bit numbers 83 */ 84 #define TIF_SYSCALL 0 /* inside a system call */ 85 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ 86 #define TIF_SIGPENDING 2 /* signal pending */ 87 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 88 #define TIF_PER_TRAP 6 /* deliver sigtrap on return to user */ 89 #define TIF_MCCK_PENDING 7 /* machine check handling is pending */ 90 #define TIF_SYSCALL_TRACE 8 /* syscall trace active */ 91 #define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */ 92 #define TIF_SECCOMP 10 /* secure computing */ 93 #define TIF_SYSCALL_TRACEPOINT 11 /* syscall tracepoint instrumentation */ 94 #define TIF_31BIT 17 /* 32bit process */ 95 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ 96 #define TIF_RESTORE_SIGMASK 19 /* restore signal mask in do_signal() */ 97 #define TIF_SINGLE_STEP 20 /* This task is single stepped */ 98 99 #define _TIF_SYSCALL (1<<TIF_SYSCALL) 100 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 101 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 102 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 103 #define _TIF_PER_TRAP (1<<TIF_PER_TRAP) 104 #define _TIF_MCCK_PENDING (1<<TIF_MCCK_PENDING) 105 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 106 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 107 #define _TIF_SECCOMP (1<<TIF_SECCOMP) 108 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 109 #define _TIF_31BIT (1<<TIF_31BIT) 110 #define _TIF_SINGLE_STEP (1<<TIF_SINGLE_STEP) 111 112 #ifdef CONFIG_64BIT 113 #define is_32bit_task() (test_thread_flag(TIF_31BIT)) 114 #else 115 #define is_32bit_task() (1) 116 #endif 117 118 #define PREEMPT_ACTIVE 0x4000000 119 120 #endif /* _ASM_THREAD_INFO_H */ 121