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 #define THREAD_ORDER 2 18 #define ASYNC_ORDER 2 19 #endif /* CONFIG_64BIT */ 20 21 #define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER) 22 #define ASYNC_SIZE (PAGE_SIZE << ASYNC_ORDER) 23 24 #ifndef __ASSEMBLY__ 25 #include <asm/lowcore.h> 26 #include <asm/page.h> 27 #include <asm/processor.h> 28 29 /* 30 * low level task data that entry.S needs immediate access to 31 * - this struct should fit entirely inside of one cache line 32 * - this struct shares the supervisor stack pages 33 * - if the contents of this structure are changed, the assembly constants must also be changed 34 */ 35 struct thread_info { 36 struct task_struct *task; /* main task structure */ 37 struct exec_domain *exec_domain; /* execution domain */ 38 unsigned long flags; /* low level flags */ 39 unsigned long sys_call_table; /* System call table address */ 40 unsigned int cpu; /* current CPU */ 41 int preempt_count; /* 0 => preemptable, <0 => BUG */ 42 unsigned int system_call; 43 __u64 user_timer; 44 __u64 system_timer; 45 unsigned long last_break; /* last breaking-event-address. */ 46 }; 47 48 /* 49 * macros/functions for gaining access to the thread information structure 50 */ 51 #define INIT_THREAD_INFO(tsk) \ 52 { \ 53 .task = &tsk, \ 54 .exec_domain = &default_exec_domain, \ 55 .flags = 0, \ 56 .cpu = 0, \ 57 .preempt_count = INIT_PREEMPT_COUNT, \ 58 } 59 60 #define init_thread_info (init_thread_union.thread_info) 61 #define init_stack (init_thread_union.stack) 62 63 /* how to get the thread information struct from C */ current_thread_info(void)64static inline struct thread_info *current_thread_info(void) 65 { 66 return (struct thread_info *) S390_lowcore.thread_info; 67 } 68 69 #define THREAD_SIZE_ORDER THREAD_ORDER 70 71 #endif 72 73 /* 74 * thread information flags bit numbers 75 */ 76 #define TIF_NOTIFY_RESUME 0 /* callback before returning to user */ 77 #define TIF_SIGPENDING 1 /* signal pending */ 78 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 79 #define TIF_SYSCALL_TRACE 3 /* syscall trace active */ 80 #define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */ 81 #define TIF_SECCOMP 5 /* secure computing */ 82 #define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */ 83 #define TIF_UPROBE 7 /* breakpointed or single-stepping */ 84 #define TIF_31BIT 16 /* 32bit process */ 85 #define TIF_MEMDIE 17 /* is terminating due to OOM killer */ 86 #define TIF_RESTORE_SIGMASK 18 /* restore signal mask in do_signal() */ 87 #define TIF_SINGLE_STEP 19 /* This task is single stepped */ 88 #define TIF_BLOCK_STEP 20 /* This task is block stepped */ 89 #define TIF_UPROBE_SINGLESTEP 21 /* This task is uprobe single stepped */ 90 91 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 92 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 93 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 94 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 95 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 96 #define _TIF_SECCOMP (1<<TIF_SECCOMP) 97 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 98 #define _TIF_UPROBE (1<<TIF_UPROBE) 99 #define _TIF_31BIT (1<<TIF_31BIT) 100 #define _TIF_SINGLE_STEP (1<<TIF_SINGLE_STEP) 101 102 #ifdef CONFIG_64BIT 103 #define is_32bit_task() (test_thread_flag(TIF_31BIT)) 104 #else 105 #define is_32bit_task() (1) 106 #endif 107 108 #endif /* _ASM_THREAD_INFO_H */ 109