1/* thread_info.h: m68knommu low-level thread information 2 * adapted from the i386 and PPC versions by Greg Ungerer (gerg@snapgear.com) 3 * 4 * Copyright (C) 2002 David Howells (dhowells@redhat.com) 5 * - Incorporating suggestions made by Linus Torvalds and Dave Miller 6 */ 7 8#ifndef _ASM_THREAD_INFO_H 9#define _ASM_THREAD_INFO_H 10 11#include <asm/page.h> 12 13#ifdef __KERNEL__ 14 15/* 16 * Size of kernel stack for each process. This must be a power of 2... 17 */ 18#ifdef CONFIG_4KSTACKS 19#define THREAD_SIZE_ORDER (0) 20#else 21#define THREAD_SIZE_ORDER (1) 22#endif 23 24/* 25 * for asm files, THREAD_SIZE is now generated by asm-offsets.c 26 */ 27#define THREAD_SIZE (PAGE_SIZE<<THREAD_SIZE_ORDER) 28 29#ifndef __ASSEMBLY__ 30 31/* 32 * low level task data. 33 */ 34struct thread_info { 35 struct task_struct *task; /* main task structure */ 36 struct exec_domain *exec_domain; /* execution domain */ 37 unsigned long flags; /* low level flags */ 38 int cpu; /* cpu we're on */ 39 int preempt_count; /* 0 => preemptable, <0 => BUG */ 40 unsigned long tp_value; /* thread pointer */ 41 struct restart_block restart_block; 42}; 43 44/* 45 * macros/functions for gaining access to the thread information structure 46 */ 47#define INIT_THREAD_INFO(tsk) \ 48{ \ 49 .task = &tsk, \ 50 .exec_domain = &default_exec_domain, \ 51 .flags = 0, \ 52 .cpu = 0, \ 53 .preempt_count = INIT_PREEMPT_COUNT, \ 54 .restart_block = { \ 55 .fn = do_no_restart_syscall, \ 56 }, \ 57} 58 59#define init_thread_info (init_thread_union.thread_info) 60#define init_stack (init_thread_union.stack) 61 62 63/* how to get the thread information struct from C */ 64static inline struct thread_info *current_thread_info(void) 65{ 66 struct thread_info *ti; 67 __asm__( 68 "move.l %%sp, %0 \n\t" 69 "and.l %1, %0" 70 : "=&d"(ti) 71 : "di" (~(THREAD_SIZE-1)) 72 ); 73 return ti; 74} 75 76#endif /* __ASSEMBLY__ */ 77 78#define PREEMPT_ACTIVE 0x4000000 79 80/* 81 * thread information flag bit numbers 82 */ 83#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 84#define TIF_SIGPENDING 1 /* signal pending */ 85#define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 86#define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling 87 TIF_NEED_RESCHED */ 88#define TIF_MEMDIE 4 /* is terminating due to OOM killer */ 89#define TIF_FREEZE 16 /* is freezing for suspend */ 90 91/* as above, but as bit values */ 92#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 93#define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 94#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 95#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 96#define _TIF_FREEZE (1<<TIF_FREEZE) 97 98#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */ 99 100#endif /* __KERNEL__ */ 101 102#endif /* _ASM_THREAD_INFO_H */ 103