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/uaccess.h> 14 15 struct thread_info { 16 struct task_struct *task; /* main task structure */ 17 struct exec_domain *exec_domain; /* execution domain */ 18 unsigned long flags; /* low level flags */ 19 __u32 cpu; /* current CPU */ 20 int preempt_count; /* 0 => preemptable, 21 <0 => BUG */ 22 mm_segment_t addr_limit; /* thread address space: 23 0-0xBFFFFFFF for user 24 0-0xFFFFFFFF for kernel */ 25 struct restart_block restart_block; 26 struct thread_info *real_thread; /* Points to non-IRQ stack */ 27 }; 28 29 #define INIT_THREAD_INFO(tsk) \ 30 { \ 31 .task = &tsk, \ 32 .exec_domain = &default_exec_domain, \ 33 .flags = 0, \ 34 .cpu = 0, \ 35 .preempt_count = INIT_PREEMPT_COUNT, \ 36 .addr_limit = KERNEL_DS, \ 37 .restart_block = { \ 38 .fn = do_no_restart_syscall, \ 39 }, \ 40 .real_thread = NULL, \ 41 } 42 43 #define init_thread_info (init_thread_union.thread_info) 44 #define init_stack (init_thread_union.stack) 45 46 #define THREAD_SIZE ((1 << CONFIG_KERNEL_STACK_ORDER) * PAGE_SIZE) 47 /* how to get the thread information struct from C */ 48 static inline struct thread_info *current_thread_info(void) 49 { 50 struct thread_info *ti; 51 unsigned long mask = THREAD_SIZE - 1; 52 void *p; 53 54 asm volatile ("" : "=r" (p) : "0" (&ti)); 55 ti = (struct thread_info *) (((unsigned long)p) & ~mask); 56 return ti; 57 } 58 59 #define THREAD_SIZE_ORDER CONFIG_KERNEL_STACK_ORDER 60 61 #endif 62 63 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 64 #define TIF_SIGPENDING 1 /* signal pending */ 65 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 66 #define TIF_RESTART_BLOCK 4 67 #define TIF_MEMDIE 5 /* is terminating due to OOM killer */ 68 #define TIF_SYSCALL_AUDIT 6 69 #define TIF_RESTORE_SIGMASK 7 70 #define TIF_NOTIFY_RESUME 8 71 72 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 73 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 74 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 75 #define _TIF_MEMDIE (1 << TIF_MEMDIE) 76 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 77 78 #endif 79