/* * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) * Licensed under the GPL */ #ifndef __UM_THREAD_INFO_H #define __UM_THREAD_INFO_H #ifndef __ASSEMBLY__ #include <asm/processor.h> #include <asm/types.h> struct thread_info { struct task_struct *task; /* main task structure */ struct exec_domain *exec_domain; /* execution domain */ unsigned long flags; /* low level flags */ __u32 cpu; /* current CPU */ int preempt_count; /* 0 => preemptable, <0 => BUG */ mm_segment_t addr_limit; /* thread address space: 0-0xBFFFFFFF for user 0-0xFFFFFFFF for kernel */ struct restart_block restart_block; struct thread_info *real_thread; /* Points to non-IRQ stack */ }; #define INIT_THREAD_INFO(tsk) \ { \ .task = &tsk, \ .exec_domain = &default_exec_domain, \ .flags = 0, \ .cpu = 0, \ .preempt_count = 1, \ .addr_limit = KERNEL_DS, \ .restart_block = { \ .fn = do_no_restart_syscall, \ }, \ .real_thread = NULL, \ } #define init_thread_info (init_thread_union.thread_info) #define init_stack (init_thread_union.stack) #define THREAD_SIZE ((1 << CONFIG_KERNEL_STACK_ORDER) * PAGE_SIZE) /* how to get the thread information struct from C */ static inline struct thread_info *current_thread_info(void) { struct thread_info *ti; unsigned long mask = THREAD_SIZE - 1; ti = (struct thread_info *) (((unsigned long) &ti) & ~mask); return ti; } #ifdef CONFIG_DEBUG_STACK_USAGE #define alloc_thread_info(tsk) \ ((struct thread_info *) __get_free_pages(GFP_KERNEL | __GFP_ZERO, \ CONFIG_KERNEL_STACK_ORDER)) #else /* thread information allocation */ #define alloc_thread_info(tsk) \ ((struct thread_info *) __get_free_pages(GFP_KERNEL, \ CONFIG_KERNEL_STACK_ORDER)) #endif #define free_thread_info(ti) \ free_pages((unsigned long)(ti),CONFIG_KERNEL_STACK_ORDER) #endif #define PREEMPT_ACTIVE 0x10000000 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ #define TIF_SIGPENDING 1 /* signal pending */ #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ #define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling * TIF_NEED_RESCHED */ #define TIF_RESTART_BLOCK 4 #define TIF_MEMDIE 5 #define TIF_SYSCALL_AUDIT 6 #define TIF_RESTORE_SIGMASK 7 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) #define _TIF_MEMDIE (1 << TIF_MEMDIE) #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) #define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK) #endif