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#ifndef __SMALL_STACK 19#define THREAD_ORDER 1 20#define ASYNC_ORDER 1 21#else 22#define THREAD_ORDER 0 23#define ASYNC_ORDER 0 24#endif 25#else /* __s390x__ */ 26#ifndef __SMALL_STACK 27#define THREAD_ORDER 2 28#define ASYNC_ORDER 2 29#else 30#define THREAD_ORDER 1 31#define ASYNC_ORDER 1 32#endif 33#endif /* __s390x__ */ 34 35#define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER) 36#define ASYNC_SIZE (PAGE_SIZE << ASYNC_ORDER) 37 38#ifndef __ASSEMBLY__ 39#include <asm/processor.h> 40#include <asm/lowcore.h> 41 42/* 43 * low level task data that entry.S needs immediate access to 44 * - this struct should fit entirely inside of one cache line 45 * - this struct shares the supervisor stack pages 46 * - if the contents of this structure are changed, the assembly constants must also be changed 47 */ 48struct thread_info { 49 struct task_struct *task; /* main task structure */ 50 struct exec_domain *exec_domain; /* execution domain */ 51 unsigned long flags; /* low level flags */ 52 unsigned int cpu; /* current CPU */ 53 int preempt_count; /* 0 => preemptable, <0 => BUG */ 54 struct restart_block restart_block; 55}; 56 57/* 58 * macros/functions for gaining access to the thread information structure 59 */ 60#define INIT_THREAD_INFO(tsk) \ 61{ \ 62 .task = &tsk, \ 63 .exec_domain = &default_exec_domain, \ 64 .flags = 0, \ 65 .cpu = 0, \ 66 .preempt_count = 1, \ 67 .restart_block = { \ 68 .fn = do_no_restart_syscall, \ 69 }, \ 70} 71 72#define init_thread_info (init_thread_union.thread_info) 73#define init_stack (init_thread_union.stack) 74 75/* how to get the thread information struct from C */ 76static inline struct thread_info *current_thread_info(void) 77{ 78 return (struct thread_info *)((*(unsigned long *) __LC_KERNEL_STACK)-THREAD_SIZE); 79} 80 81/* thread information allocation */ 82#define alloc_thread_info(tsk) ((struct thread_info *) \ 83 __get_free_pages(GFP_KERNEL,THREAD_ORDER)) 84#define free_thread_info(ti) free_pages((unsigned long) (ti),THREAD_ORDER) 85 86#endif 87 88/* 89 * thread information flags bit numbers 90 */ 91#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 92#define TIF_RESTORE_SIGMASK 1 /* restore signal mask in do_signal() */ 93#define TIF_SIGPENDING 2 /* signal pending */ 94#define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 95#define TIF_RESTART_SVC 4 /* restart svc with new svc number */ 96#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ 97#define TIF_SINGLE_STEP 6 /* deliver sigtrap on return to user */ 98#define TIF_MCCK_PENDING 7 /* machine check handling is pending */ 99#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */ 100#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling 101 TIF_NEED_RESCHED */ 102#define TIF_31BIT 18 /* 32bit process */ 103#define TIF_MEMDIE 19 104 105#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 106#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) 107#define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 108#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 109#define _TIF_RESTART_SVC (1<<TIF_RESTART_SVC) 110#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 111#define _TIF_SINGLE_STEP (1<<TIF_SINGLE_STEP) 112#define _TIF_MCCK_PENDING (1<<TIF_MCCK_PENDING) 113#define _TIF_USEDFPU (1<<TIF_USEDFPU) 114#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 115#define _TIF_31BIT (1<<TIF_31BIT) 116 117#endif /* __KERNEL__ */ 118 119#define PREEMPT_ACTIVE 0x4000000 120 121#endif /* _ASM_THREAD_INFO_H */ 122