1 /* 2 * S390 version 3 * Copyright IBM Corp. 2002, 2006 4 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) 5 */ 6 7 #ifndef _ASM_THREAD_INFO_H 8 #define _ASM_THREAD_INFO_H 9 10 /* 11 * Size of kernel stack for each process 12 */ 13 #ifndef CONFIG_64BIT 14 #define THREAD_ORDER 1 15 #define ASYNC_ORDER 1 16 #else /* CONFIG_64BIT */ 17 #define THREAD_ORDER 2 18 #define ASYNC_ORDER 2 19 #endif /* CONFIG_64BIT */ 20 21 #define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER) 22 #define ASYNC_SIZE (PAGE_SIZE << ASYNC_ORDER) 23 24 #ifndef __ASSEMBLY__ 25 #include <asm/lowcore.h> 26 #include <asm/page.h> 27 #include <asm/processor.h> 28 29 /* 30 * low level task data that entry.S needs immediate access to 31 * - this struct should fit entirely inside of one cache line 32 * - this struct shares the supervisor stack pages 33 * - if the contents of this structure are changed, the assembly constants must also be changed 34 */ 35 struct thread_info { 36 struct task_struct *task; /* main task structure */ 37 struct exec_domain *exec_domain; /* execution domain */ 38 unsigned long flags; /* low level flags */ 39 unsigned long sys_call_table; /* System call table address */ 40 unsigned int cpu; /* current CPU */ 41 int preempt_count; /* 0 => preemptable, <0 => BUG */ 42 struct restart_block restart_block; 43 unsigned int system_call; 44 __u64 user_timer; 45 __u64 system_timer; 46 unsigned long last_break; /* last breaking-event-address. */ 47 }; 48 49 /* 50 * macros/functions for gaining access to the thread information structure 51 */ 52 #define INIT_THREAD_INFO(tsk) \ 53 { \ 54 .task = &tsk, \ 55 .exec_domain = &default_exec_domain, \ 56 .flags = 0, \ 57 .cpu = 0, \ 58 .preempt_count = INIT_PREEMPT_COUNT, \ 59 .restart_block = { \ 60 .fn = do_no_restart_syscall, \ 61 }, \ 62 } 63 64 #define init_thread_info (init_thread_union.thread_info) 65 #define init_stack (init_thread_union.stack) 66 67 /* how to get the thread information struct from C */ 68 static inline struct thread_info *current_thread_info(void) 69 { 70 return (struct thread_info *) S390_lowcore.thread_info; 71 } 72 73 #define THREAD_SIZE_ORDER THREAD_ORDER 74 75 #endif 76 77 /* 78 * thread information flags bit numbers 79 */ 80 #define TIF_SYSCALL 0 /* inside a system call */ 81 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ 82 #define TIF_SIGPENDING 2 /* signal pending */ 83 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 84 #define TIF_TLB_WAIT 4 /* wait for TLB flush completion */ 85 #define TIF_ASCE 5 /* primary asce needs fixup / uaccess */ 86 #define TIF_PER_TRAP 6 /* deliver sigtrap on return to user */ 87 #define TIF_MCCK_PENDING 7 /* machine check handling is pending */ 88 #define TIF_SYSCALL_TRACE 8 /* syscall trace active */ 89 #define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */ 90 #define TIF_SECCOMP 10 /* secure computing */ 91 #define TIF_SYSCALL_TRACEPOINT 11 /* syscall tracepoint instrumentation */ 92 #define TIF_31BIT 17 /* 32bit process */ 93 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ 94 #define TIF_RESTORE_SIGMASK 19 /* restore signal mask in do_signal() */ 95 #define TIF_SINGLE_STEP 20 /* This task is single stepped */ 96 #define TIF_BLOCK_STEP 21 /* This task is block stepped */ 97 98 #define _TIF_SYSCALL (1<<TIF_SYSCALL) 99 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 100 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 101 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 102 #define _TIF_TLB_WAIT (1<<TIF_TLB_WAIT) 103 #define _TIF_ASCE (1<<TIF_ASCE) 104 #define _TIF_PER_TRAP (1<<TIF_PER_TRAP) 105 #define _TIF_MCCK_PENDING (1<<TIF_MCCK_PENDING) 106 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 107 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 108 #define _TIF_SECCOMP (1<<TIF_SECCOMP) 109 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 110 #define _TIF_31BIT (1<<TIF_31BIT) 111 #define _TIF_SINGLE_STEP (1<<TIF_SINGLE_STEP) 112 113 #ifdef CONFIG_64BIT 114 #define is_32bit_task() (test_thread_flag(TIF_31BIT)) 115 #else 116 #define is_32bit_task() (1) 117 #endif 118 119 #endif /* _ASM_THREAD_INFO_H */ 120