| /* |
| * 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); |
| } |
| |
| #define THREAD_SIZE_ORDER THREAD_ORDER |
| |
| #endif |
| |
| /* |
| * thread information flags bit numbers |
| */ |
| #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ |
| #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ |
| #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_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) |
| #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 */ |