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 #define THREAD_ORDER 2 14 #define ASYNC_ORDER 2 15 16 #define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER) 17 #define ASYNC_SIZE (PAGE_SIZE << ASYNC_ORDER) 18 19 #ifndef __ASSEMBLY__ 20 #include <asm/lowcore.h> 21 #include <asm/page.h> 22 #include <asm/processor.h> 23 24 /* 25 * low level task data that entry.S needs immediate access to 26 * - this struct should fit entirely inside of one cache line 27 * - this struct shares the supervisor stack pages 28 * - if the contents of this structure are changed, the assembly constants must also be changed 29 */ 30 struct thread_info { 31 struct task_struct *task; /* main task structure */ 32 unsigned long flags; /* low level flags */ 33 unsigned long sys_call_table; /* System call table address */ 34 unsigned int cpu; /* current CPU */ 35 int preempt_count; /* 0 => preemptable, <0 => BUG */ 36 unsigned int system_call; 37 __u64 user_timer; 38 __u64 system_timer; 39 unsigned long last_break; /* last breaking-event-address. */ 40 }; 41 42 /* 43 * macros/functions for gaining access to the thread information structure 44 */ 45 #define INIT_THREAD_INFO(tsk) \ 46 { \ 47 .task = &tsk, \ 48 .flags = 0, \ 49 .cpu = 0, \ 50 .preempt_count = INIT_PREEMPT_COUNT, \ 51 } 52 53 #define init_thread_info (init_thread_union.thread_info) 54 #define init_stack (init_thread_union.stack) 55 56 /* how to get the thread information struct from C */ 57 static inline struct thread_info *current_thread_info(void) 58 { 59 return (struct thread_info *) S390_lowcore.thread_info; 60 } 61 62 void arch_release_task_struct(struct task_struct *tsk); 63 64 #define THREAD_SIZE_ORDER THREAD_ORDER 65 66 #endif 67 68 /* 69 * thread information flags bit numbers 70 */ 71 #define TIF_NOTIFY_RESUME 0 /* callback before returning to user */ 72 #define TIF_SIGPENDING 1 /* signal pending */ 73 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 74 #define TIF_SYSCALL_TRACE 3 /* syscall trace active */ 75 #define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */ 76 #define TIF_SECCOMP 5 /* secure computing */ 77 #define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */ 78 #define TIF_UPROBE 7 /* breakpointed or single-stepping */ 79 #define TIF_31BIT 16 /* 32bit process */ 80 #define TIF_MEMDIE 17 /* is terminating due to OOM killer */ 81 #define TIF_RESTORE_SIGMASK 18 /* restore signal mask in do_signal() */ 82 #define TIF_SINGLE_STEP 19 /* This task is single stepped */ 83 #define TIF_BLOCK_STEP 20 /* This task is block stepped */ 84 #define TIF_UPROBE_SINGLESTEP 21 /* This task is uprobe single stepped */ 85 86 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 87 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 88 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 89 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 90 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 91 #define _TIF_SECCOMP (1<<TIF_SECCOMP) 92 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 93 #define _TIF_UPROBE (1<<TIF_UPROBE) 94 #define _TIF_31BIT (1<<TIF_31BIT) 95 #define _TIF_SINGLE_STEP (1<<TIF_SINGLE_STEP) 96 97 #define is_32bit_task() (test_thread_flag(TIF_31BIT)) 98 99 #endif /* _ASM_THREAD_INFO_H */ 100