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Diffstat (limited to 'include/asm-s390/thread_info.h')
| -rw-r--r-- | include/asm-s390/thread_info.h | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/include/asm-s390/thread_info.h b/include/asm-s390/thread_info.h new file mode 100644 index 0000000..aade85c --- /dev/null +++ b/include/asm-s390/thread_info.h @@ -0,0 +1,120 @@ +/* + * include/asm-s390/thread_info.h + * + * S390 version + * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, IBM Corporation + * 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 */ + unsigned int preempt_count; /* 0 => preemptable */ + 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, \ + .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) +#define get_thread_info(ti) get_task_struct((ti)->task) +#define put_thread_info(ti) put_task_struct((ti)->task) + +#endif + +/* + * thread information flags bit numbers + */ +#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ +#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ +#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_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_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) +#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) +#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_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 */ |