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cbb870c822
Use asm offsets to make sure the offset defines to struct _lowcore and its layout don't get out of sync. Also add a BUILD_BUG_ON() which checks that the size of the structure is sane. And while being at it change those sites which use odd casts to access the current lowcore. These should use S390_lowcore instead. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
123 lines
3.6 KiB
C
123 lines
3.6 KiB
C
/*
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* include/asm-s390/thread_info.h
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*
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* S390 version
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* Copyright (C) IBM Corp. 2002,2006
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
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*/
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#ifndef _ASM_THREAD_INFO_H
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#define _ASM_THREAD_INFO_H
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#ifdef __KERNEL__
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/*
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* Size of kernel stack for each process
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*/
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#ifndef __s390x__
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#define THREAD_ORDER 1
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#define ASYNC_ORDER 1
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#else /* __s390x__ */
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#ifndef __SMALL_STACK
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#define THREAD_ORDER 2
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#define ASYNC_ORDER 2
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#else
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#define THREAD_ORDER 1
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#define ASYNC_ORDER 1
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#endif
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#endif /* __s390x__ */
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#define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)
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#define ASYNC_SIZE (PAGE_SIZE << ASYNC_ORDER)
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#ifndef __ASSEMBLY__
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#include <asm/lowcore.h>
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#include <asm/page.h>
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#include <asm/processor.h>
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/*
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* low level task data that entry.S needs immediate access to
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* - this struct should fit entirely inside of one cache line
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* - this struct shares the supervisor stack pages
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* - if the contents of this structure are changed, the assembly constants must also be changed
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*/
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struct thread_info {
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struct task_struct *task; /* main task structure */
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struct exec_domain *exec_domain; /* execution domain */
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unsigned long flags; /* low level flags */
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unsigned int cpu; /* current CPU */
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int preempt_count; /* 0 => preemptable, <0 => BUG */
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struct restart_block restart_block;
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__u64 user_timer;
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__u64 system_timer;
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};
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/*
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* macros/functions for gaining access to the thread information structure
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*/
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#define INIT_THREAD_INFO(tsk) \
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{ \
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.task = &tsk, \
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.exec_domain = &default_exec_domain, \
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.flags = 0, \
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.cpu = 0, \
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.preempt_count = INIT_PREEMPT_COUNT, \
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.restart_block = { \
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.fn = do_no_restart_syscall, \
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}, \
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}
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#define init_thread_info (init_thread_union.thread_info)
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#define init_stack (init_thread_union.stack)
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/* how to get the thread information struct from C */
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static inline struct thread_info *current_thread_info(void)
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{
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return (struct thread_info *)(S390_lowcore.kernel_stack - THREAD_SIZE);
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}
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#define THREAD_SIZE_ORDER THREAD_ORDER
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#endif
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/*
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* thread information flags bit numbers
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*/
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#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
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#define TIF_SIGPENDING 2 /* signal pending */
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#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
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#define TIF_RESTART_SVC 4 /* restart svc with new svc number */
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#define TIF_SINGLE_STEP 6 /* deliver sigtrap on return to user */
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#define TIF_MCCK_PENDING 7 /* machine check handling is pending */
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#define TIF_SYSCALL_TRACE 8 /* syscall trace active */
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#define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */
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#define TIF_SECCOMP 10 /* secure computing */
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#define TIF_SYSCALL_TRACEPOINT 11 /* syscall tracepoint instrumentation */
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#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling
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TIF_NEED_RESCHED */
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#define TIF_31BIT 17 /* 32bit process */
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#define TIF_MEMDIE 18
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#define TIF_RESTORE_SIGMASK 19 /* restore signal mask in do_signal() */
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#define TIF_FREEZE 20 /* thread is freezing for suspend */
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#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
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#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
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#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
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#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
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#define _TIF_RESTART_SVC (1<<TIF_RESTART_SVC)
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#define _TIF_SINGLE_STEP (1<<TIF_SINGLE_STEP)
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#define _TIF_MCCK_PENDING (1<<TIF_MCCK_PENDING)
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#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
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#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
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#define _TIF_SECCOMP (1<<TIF_SECCOMP)
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#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
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#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
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#define _TIF_31BIT (1<<TIF_31BIT)
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#define _TIF_FREEZE (1<<TIF_FREEZE)
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#endif /* __KERNEL__ */
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#define PREEMPT_ACTIVE 0x4000000
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#endif /* _ASM_THREAD_INFO_H */
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