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#ifndef __ASSEMBLY__ 16 17/* 18 * Size of kernel stack for each process. This must be a power of 2... 19 */ 20#ifdef CONFIG_4KSTACKS 21#define THREAD_SIZE_ORDER (0) 22#else 23#define THREAD_SIZE_ORDER (1) 24#endif 25 26/* 27 * for asm files, THREAD_SIZE is now generated by asm-offsets.c 28 */ 29#define THREAD_SIZE (PAGE_SIZE<<THREAD_SIZE_ORDER) 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 struct restart_block restart_block; 41}; 42 43/* 44 * macros/functions for gaining access to the thread information structure 45 */ 46#define INIT_THREAD_INFO(tsk) \ 47{ \ 48 .task = &tsk, \ 49 .exec_domain = &default_exec_domain, \ 50 .flags = 0, \ 51 .cpu = 0, \ 52 .restart_block = { \ 53 .fn = do_no_restart_syscall, \ 54 }, \ 55} 56 57#define init_thread_info (init_thread_union.thread_info) 58#define init_stack (init_thread_union.stack) 59 60 61/* how to get the thread information struct from C */ 62static inline struct thread_info *current_thread_info(void) 63{ 64 struct thread_info *ti; 65 __asm__( 66 "move.l %%sp, %0 \n\t" 67 "and.l %1, %0" 68 : "=&d"(ti) 69 : "di" (~(THREAD_SIZE-1)) 70 ); 71 return ti; 72} 73 74/* thread information allocation */ 75#define alloc_thread_info(tsk) ((struct thread_info *) \ 76 __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER)) 77#define free_thread_info(ti) free_pages((unsigned long) (ti), THREAD_SIZE_ORDER) 78#endif /* __ASSEMBLY__ */ 79 80#define PREEMPT_ACTIVE 0x4000000 81 82/* 83 * thread information flag bit numbers 84 */ 85#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 86#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ 87#define TIF_SIGPENDING 2 /* signal pending */ 88#define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 89#define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling 90 TIF_NEED_RESCHED */ 91#define TIF_MEMDIE 5 92 93/* as above, but as bit values */ 94#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 95#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 96#define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 97#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 98#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 99 100#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */ 101 102#endif /* __KERNEL__ */ 103 104#endif /* _ASM_THREAD_INFO_H */ 105