/* * include/asm-s390/thread_info.h * * S390 version * Copyright (C) IBM Corp. 2002,2006 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) */ #ifndef _ASM_THREAD_INFO_H #define _ASM_THREAD_INFO_H #ifdef __KERNEL__ /* * Size of kernel stack for each process */ #ifndef __s390x__ #ifndef __SMALL_STACK #define THREAD_ORDER 1 #define ASYNC_ORDER 1 #else #define THREAD_ORDER 0 #define ASYNC_ORDER 0 #endif #else /* __s390x__ */ #ifndef __SMALL_STACK #define THREAD_ORDER 2 #define ASYNC_ORDER 2 #else #define THREAD_ORDER 1 #define ASYNC_ORDER 1 #endif #endif /* __s390x__ */ #define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER) #define ASYNC_SIZE (PAGE_SIZE << ASYNC_ORDER) #ifndef __ASSEMBLY__ #include <asm/processor.h> #include <asm/lowcore.h> /* * low level task data that entry.S needs immediate access to * - this struct should fit entirely inside of one cache line * - this struct shares the supervisor stack pages * - if the contents of this structure are changed, the assembly constants must also be changed */ struct thread_info { struct task_struct *task; /* main task structure */ struct exec_domain *exec_domain; /* execution domain */ unsigned long flags; /* low level flags */ unsigned int cpu; /* current CPU */ int preempt_count; /* 0 => preemptable, <0 => BUG */ struct restart_block restart_block; }; /* * macros/functions for gaining access to the thread information structure */ #define INIT_THREAD_INFO(tsk) \ { \ .task = &tsk, \ .exec_domain = &default_exec_domain, \ .flags = 0, \ .cpu = 0, \ .preempt_count = 1, \ .restart_block = { \ .fn = do_no_restart_syscall, \ }, \ } #define init_thread_info (init_thread_union.thread_info) #define init_stack (init_thread_union.stack) /* how to get the thread information struct from C */ static inline struct thread_info *current_thread_info(void) { return (struct thread_info *)((*(unsigned long *) __LC_KERNEL_STACK)-THREAD_SIZE); } /* thread information allocation */ #define alloc_thread_info(tsk) ((struct thread_info *) \ __get_free_pages(GFP_KERNEL,THREAD_ORDER)) #define free_thread_info(ti) free_pages((unsigned long) (ti),THREAD_ORDER) #endif /* * thread information flags bit numbers */ #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ #define TIF_SIGPENDING 2 /* signal pending */ #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ #define TIF_RESTART_SVC 4 /* restart svc with new svc number */ #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ #define TIF_SINGLE_STEP 6 /* deliver sigtrap on return to user */ #define TIF_MCCK_PENDING 7 /* machine check handling is pending */ #define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */ #define TIF_31BIT 18 /* 32bit process */ #define TIF_MEMDIE 19 #define TIF_RESTORE_SIGMASK 20 /* restore signal mask in do_signal() */ #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) #define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) #define _TIF_RESTART_SVC (1<<TIF_RESTART_SVC) #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) #define _TIF_SINGLE_STEP (1<<TIF_SINGLE_STEP) #define _TIF_MCCK_PENDING (1<<TIF_MCCK_PENDING) #define _TIF_USEDFPU (1<<TIF_USEDFPU) #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) #define _TIF_31BIT (1<<TIF_31BIT) #endif /* __KERNEL__ */ #define PREEMPT_ACTIVE 0x4000000 #endif /* _ASM_THREAD_INFO_H */