1 /* 2 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) 3 * Licensed under the GPL 4 */ 5 6 #ifndef __UM_THREAD_INFO_H 7 #define __UM_THREAD_INFO_H 8 9 #ifndef __ASSEMBLY__ 10 11 #include <asm/types.h> 12 #include <asm/page.h> 13 #include <asm/segment.h> 14 15 struct thread_info { 16 struct task_struct *task; /* main task structure */ 17 unsigned long flags; /* low level flags */ 18 __u32 cpu; /* current CPU */ 19 int preempt_count; /* 0 => preemptable, 20 <0 => BUG */ 21 mm_segment_t addr_limit; /* thread address space: 22 0-0xBFFFFFFF for user 23 0-0xFFFFFFFF for kernel */ 24 struct thread_info *real_thread; /* Points to non-IRQ stack */ 25 }; 26 27 #define INIT_THREAD_INFO(tsk) \ 28 { \ 29 .task = &tsk, \ 30 .flags = 0, \ 31 .cpu = 0, \ 32 .preempt_count = INIT_PREEMPT_COUNT, \ 33 .addr_limit = KERNEL_DS, \ 34 .real_thread = NULL, \ 35 } 36 37 #define init_thread_info (init_thread_union.thread_info) 38 #define init_stack (init_thread_union.stack) 39 40 #define THREAD_SIZE ((1 << CONFIG_KERNEL_STACK_ORDER) * PAGE_SIZE) 41 /* how to get the thread information struct from C */ 42 static inline struct thread_info *current_thread_info(void) 43 { 44 struct thread_info *ti; 45 unsigned long mask = THREAD_SIZE - 1; 46 void *p; 47 48 asm volatile ("" : "=r" (p) : "0" (&ti)); 49 ti = (struct thread_info *) (((unsigned long)p) & ~mask); 50 return ti; 51 } 52 53 #define THREAD_SIZE_ORDER CONFIG_KERNEL_STACK_ORDER 54 55 #endif 56 57 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 58 #define TIF_SIGPENDING 1 /* signal pending */ 59 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 60 #define TIF_RESTART_BLOCK 4 61 #define TIF_MEMDIE 5 /* is terminating due to OOM killer */ 62 #define TIF_SYSCALL_AUDIT 6 63 #define TIF_RESTORE_SIGMASK 7 64 #define TIF_NOTIFY_RESUME 8 65 66 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 67 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 68 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 69 #define _TIF_MEMDIE (1 << TIF_MEMDIE) 70 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 71 72 #endif 73