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 #include <sysdep/ptrace_user.h> 15 16 struct thread_info { 17 struct task_struct *task; /* main task structure */ 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 thread_info *real_thread; /* Points to non-IRQ stack */ 26 unsigned long aux_fp_regs[FP_SIZE]; /* auxiliary fp_regs to save/restore 27 them out-of-band */ 28 }; 29 30 #define INIT_THREAD_INFO(tsk) \ 31 { \ 32 .task = &tsk, \ 33 .flags = 0, \ 34 .cpu = 0, \ 35 .preempt_count = INIT_PREEMPT_COUNT, \ 36 .addr_limit = KERNEL_DS, \ 37 .real_thread = NULL, \ 38 } 39 40 #define init_thread_info (init_thread_union.thread_info) 41 #define init_stack (init_thread_union.stack) 42 43 #define THREAD_SIZE ((1 << CONFIG_KERNEL_STACK_ORDER) * PAGE_SIZE) 44 /* how to get the thread information struct from C */ 45 static inline struct thread_info *current_thread_info(void) 46 { 47 struct thread_info *ti; 48 unsigned long mask = THREAD_SIZE - 1; 49 void *p; 50 51 asm volatile ("" : "=r" (p) : "0" (&ti)); 52 ti = (struct thread_info *) (((unsigned long)p) & ~mask); 53 return ti; 54 } 55 56 #define THREAD_SIZE_ORDER CONFIG_KERNEL_STACK_ORDER 57 58 #endif 59 60 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 61 #define TIF_SIGPENDING 1 /* signal pending */ 62 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 63 #define TIF_RESTART_BLOCK 4 64 #define TIF_MEMDIE 5 /* is terminating due to OOM killer */ 65 #define TIF_SYSCALL_AUDIT 6 66 #define TIF_RESTORE_SIGMASK 7 67 #define TIF_NOTIFY_RESUME 8 68 #define TIF_SECCOMP 9 /* secure computing */ 69 70 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 71 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 72 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 73 #define _TIF_MEMDIE (1 << TIF_MEMDIE) 74 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 75 #define _TIF_SECCOMP (1 << TIF_SECCOMP) 76 77 #endif 78