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 #include <linux/const.h> 11 12 /* 13 * Size of kernel stack for each process 14 */ 15 #define THREAD_ORDER 2 16 #define ASYNC_ORDER 2 17 18 #define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER) 19 #define ASYNC_SIZE (PAGE_SIZE << ASYNC_ORDER) 20 21 #ifndef __ASSEMBLY__ 22 #include <asm/lowcore.h> 23 #include <asm/page.h> 24 #include <asm/processor.h> 25 26 /* 27 * low level task data that entry.S needs immediate access to 28 * - this struct should fit entirely inside of one cache line 29 * - this struct shares the supervisor stack pages 30 * - if the contents of this structure are changed, the assembly constants must also be changed 31 */ 32 struct thread_info { 33 struct task_struct *task; /* main task structure */ 34 unsigned long flags; /* low level flags */ 35 unsigned long sys_call_table; /* System call table address */ 36 unsigned int cpu; /* current CPU */ 37 int preempt_count; /* 0 => preemptable, <0 => BUG */ 38 unsigned int system_call; 39 __u64 user_timer; 40 __u64 system_timer; 41 unsigned long last_break; /* last breaking-event-address. */ 42 }; 43 44 /* 45 * macros/functions for gaining access to the thread information structure 46 */ 47 #define INIT_THREAD_INFO(tsk) \ 48 { \ 49 .task = &tsk, \ 50 .flags = 0, \ 51 .cpu = 0, \ 52 .preempt_count = INIT_PREEMPT_COUNT, \ 53 } 54 55 #define init_thread_info (init_thread_union.thread_info) 56 #define init_stack (init_thread_union.stack) 57 58 /* how to get the thread information struct from C */ 59 static inline struct thread_info *current_thread_info(void) 60 { 61 return (struct thread_info *) S390_lowcore.thread_info; 62 } 63 64 void arch_release_task_struct(struct task_struct *tsk); 65 int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); 66 67 #define THREAD_SIZE_ORDER THREAD_ORDER 68 69 #endif 70 71 /* 72 * thread information flags bit numbers 73 */ 74 #define TIF_NOTIFY_RESUME 0 /* callback before returning to user */ 75 #define TIF_SIGPENDING 1 /* signal pending */ 76 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 77 #define TIF_SYSCALL_TRACE 3 /* syscall trace active */ 78 #define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */ 79 #define TIF_SECCOMP 5 /* secure computing */ 80 #define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */ 81 #define TIF_UPROBE 7 /* breakpointed or single-stepping */ 82 #define TIF_31BIT 16 /* 32bit process */ 83 #define TIF_MEMDIE 17 /* is terminating due to OOM killer */ 84 #define TIF_RESTORE_SIGMASK 18 /* restore signal mask in do_signal() */ 85 #define TIF_SINGLE_STEP 19 /* This task is single stepped */ 86 #define TIF_BLOCK_STEP 20 /* This task is block stepped */ 87 #define TIF_UPROBE_SINGLESTEP 21 /* This task is uprobe single stepped */ 88 89 #define _TIF_NOTIFY_RESUME _BITUL(TIF_NOTIFY_RESUME) 90 #define _TIF_SIGPENDING _BITUL(TIF_SIGPENDING) 91 #define _TIF_NEED_RESCHED _BITUL(TIF_NEED_RESCHED) 92 #define _TIF_SYSCALL_TRACE _BITUL(TIF_SYSCALL_TRACE) 93 #define _TIF_SYSCALL_AUDIT _BITUL(TIF_SYSCALL_AUDIT) 94 #define _TIF_SECCOMP _BITUL(TIF_SECCOMP) 95 #define _TIF_SYSCALL_TRACEPOINT _BITUL(TIF_SYSCALL_TRACEPOINT) 96 #define _TIF_UPROBE _BITUL(TIF_UPROBE) 97 #define _TIF_31BIT _BITUL(TIF_31BIT) 98 #define _TIF_SINGLE_STEP _BITUL(TIF_SINGLE_STEP) 99 100 #endif /* _ASM_THREAD_INFO_H */ 101