1/* thread_info.h: h8300 low-level thread information 2 * adapted from the i386 and PPC versions by Yoshinori Sato <ysato@users.sourceforge.jp> 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 * low level task data. 19 * If you change this, change the TI_* offsets below to match. 20 */ 21struct thread_info { 22 struct task_struct *task; /* main task structure */ 23 struct exec_domain *exec_domain; /* execution domain */ 24 unsigned long flags; /* low level flags */ 25 int cpu; /* cpu we're on */ 26 int preempt_count; /* 0 => preemptable, <0 => BUG */ 27 struct restart_block restart_block; 28}; 29 30/* 31 * macros/functions for gaining access to the thread information structure 32 */ 33#define INIT_THREAD_INFO(tsk) \ 34{ \ 35 .task = &tsk, \ 36 .exec_domain = &default_exec_domain, \ 37 .flags = 0, \ 38 .cpu = 0, \ 39 .preempt_count = INIT_PREEMPT_COUNT, \ 40 .restart_block = { \ 41 .fn = do_no_restart_syscall, \ 42 }, \ 43} 44 45#define init_thread_info (init_thread_union.thread_info) 46#define init_stack (init_thread_union.stack) 47 48 49/* 50 * Size of kernel stack for each process. This must be a power of 2... 51 */ 52#define THREAD_SIZE_ORDER 1 53#define THREAD_SIZE 8192 /* 2 pages */ 54 55 56/* how to get the thread information struct from C */ 57static inline struct thread_info *current_thread_info(void) 58{ 59 struct thread_info *ti; 60 __asm__( 61 "mov.l sp, %0 \n\t" 62 "and.l %1, %0" 63 : "=&r"(ti) 64 : "i" (~(THREAD_SIZE-1)) 65 ); 66 return ti; 67} 68 69#endif /* __ASSEMBLY__ */ 70 71/* 72 * Offsets in thread_info structure, used in assembly code 73 */ 74#define TI_TASK 0 75#define TI_EXECDOMAIN 4 76#define TI_FLAGS 8 77#define TI_CPU 12 78#define TI_PRE_COUNT 16 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_SIGPENDING 1 /* signal pending */ 87#define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 88#define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling 89 TIF_NEED_RESCHED */ 90#define TIF_MEMDIE 4 /* is terminating due to OOM killer */ 91#define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */ 92#define TIF_NOTIFY_RESUME 6 /* callback before returning to user */ 93#define TIF_FREEZE 16 /* is freezing for suspend */ 94 95/* as above, but as bit values */ 96#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 97#define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 98#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 99#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 100#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK) 101#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 102#define _TIF_FREEZE (1<<TIF_FREEZE) 103 104#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */ 105 106#endif /* __KERNEL__ */ 107 108#endif /* _ASM_THREAD_INFO_H */ 109