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#ifdef __KERNEL__ 13 14/* 15 * Size of kernel stack for each process 16 */ 17#ifndef __s390x__ 18#define THREAD_ORDER 1 19#define ASYNC_ORDER 1 20#else /* __s390x__ */ 21#ifndef __SMALL_STACK 22#define THREAD_ORDER 2 23#define ASYNC_ORDER 2 24#else 25#define THREAD_ORDER 1 26#define ASYNC_ORDER 1 27#endif 28#endif /* __s390x__ */ 29 30#define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER) 31#define ASYNC_SIZE (PAGE_SIZE << ASYNC_ORDER) 32 33#ifndef __ASSEMBLY__ 34#include <asm/lowcore.h> 35#include <asm/page.h> 36#include <asm/processor.h> 37 38/* 39 * low level task data that entry.S needs immediate access to 40 * - this struct should fit entirely inside of one cache line 41 * - this struct shares the supervisor stack pages 42 * - if the contents of this structure are changed, the assembly constants must also be changed 43 */ 44struct thread_info { 45 struct task_struct *task; /* main task structure */ 46 struct exec_domain *exec_domain; /* execution domain */ 47 unsigned long flags; /* low level flags */ 48 unsigned int cpu; /* current CPU */ 49 int preempt_count; /* 0 => preemptable, <0 => BUG */ 50 struct restart_block restart_block; 51 __u64 user_timer; 52 __u64 system_timer; 53 unsigned long last_break; /* last breaking-event-address. */ 54}; 55 56/* 57 * macros/functions for gaining access to the thread information structure 58 */ 59#define INIT_THREAD_INFO(tsk) \ 60{ \ 61 .task = &tsk, \ 62 .exec_domain = &default_exec_domain, \ 63 .flags = 0, \ 64 .cpu = 0, \ 65 .preempt_count = INIT_PREEMPT_COUNT, \ 66 .restart_block = { \ 67 .fn = do_no_restart_syscall, \ 68 }, \ 69} 70 71#define init_thread_info (init_thread_union.thread_info) 72#define init_stack (init_thread_union.stack) 73 74/* how to get the thread information struct from C */ 75static inline struct thread_info *current_thread_info(void) 76{ 77 return (struct thread_info *)(S390_lowcore.kernel_stack - THREAD_SIZE); 78} 79 80#define THREAD_SIZE_ORDER THREAD_ORDER 81 82#endif 83 84/* 85 * thread information flags bit numbers 86 */ 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_RESTART_SVC 4 /* restart svc with new svc number */ 91#define TIF_SINGLE_STEP 6 /* deliver sigtrap on return to user */ 92#define TIF_MCCK_PENDING 7 /* machine check handling is pending */ 93#define TIF_SYSCALL_TRACE 8 /* syscall trace active */ 94#define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */ 95#define TIF_SECCOMP 10 /* secure computing */ 96#define TIF_SYSCALL_TRACEPOINT 11 /* syscall tracepoint instrumentation */ 97#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling 98 TIF_NEED_RESCHED */ 99#define TIF_31BIT 17 /* 32bit process */ 100#define TIF_MEMDIE 18 /* is terminating due to OOM killer */ 101#define TIF_RESTORE_SIGMASK 19 /* restore signal mask in do_signal() */ 102#define TIF_FREEZE 20 /* thread is freezing for suspend */ 103 104#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_RESTART_SVC (1<<TIF_RESTART_SVC) 109#define _TIF_SINGLE_STEP (1<<TIF_SINGLE_STEP) 110#define _TIF_MCCK_PENDING (1<<TIF_MCCK_PENDING) 111#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 112#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 113#define _TIF_SECCOMP (1<<TIF_SECCOMP) 114#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 115#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 116#define _TIF_31BIT (1<<TIF_31BIT) 117#define _TIF_FREEZE (1<<TIF_FREEZE) 118 119#endif /* __KERNEL__ */ 120 121#define PREEMPT_ACTIVE 0x4000000 122 123#endif /* _ASM_THREAD_INFO_H */ 124