1/* 2 * Copyright (C) 2004-2006 Atmel Corporation 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 */ 8#ifndef __ASM_AVR32_THREAD_INFO_H 9#define __ASM_AVR32_THREAD_INFO_H 10 11#include <asm/page.h> 12 13#define THREAD_SIZE_ORDER 1 14#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) 15 16#ifndef __ASSEMBLY__ 17#include <asm/types.h> 18 19struct task_struct; 20struct exec_domain; 21 22struct thread_info { 23 struct task_struct *task; /* main task structure */ 24 struct exec_domain *exec_domain; /* execution domain */ 25 unsigned long flags; /* low level flags */ 26 __u32 cpu; 27 __s32 preempt_count; /* 0 => preemptable, <0 => BUG */ 28 __u32 rar_saved; /* return address... */ 29 __u32 rsr_saved; /* ...and status register 30 saved by debug handler 31 when setting up 32 trampoline */ 33 struct restart_block restart_block; 34 __u8 supervisor_stack[0]; 35}; 36 37#define INIT_THREAD_INFO(tsk) \ 38{ \ 39 .task = &tsk, \ 40 .exec_domain = &default_exec_domain, \ 41 .flags = 0, \ 42 .cpu = 0, \ 43 .preempt_count = INIT_PREEMPT_COUNT, \ 44 .restart_block = { \ 45 .fn = do_no_restart_syscall \ 46 } \ 47} 48 49#define init_thread_info (init_thread_union.thread_info) 50#define init_stack (init_thread_union.stack) 51 52/* 53 * Get the thread information struct from C. 54 * We do the usual trick and use the lower end of the stack for this 55 */ 56static inline struct thread_info *current_thread_info(void) 57{ 58 unsigned long addr = ~(THREAD_SIZE - 1); 59 60 asm("and %0, sp" : "=r"(addr) : "0"(addr)); 61 return (struct thread_info *)addr; 62} 63 64#define get_thread_info(ti) get_task_struct((ti)->task) 65#define put_thread_info(ti) put_task_struct((ti)->task) 66 67#endif /* !__ASSEMBLY__ */ 68 69#define PREEMPT_ACTIVE 0x40000000 70 71/* 72 * Thread information flags 73 * - these are process state flags that various assembly files may need to access 74 * - pending work-to-be-done flags are in LSW 75 * - other flags in MSW 76 */ 77#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 78#define TIF_SIGPENDING 1 /* signal pending */ 79#define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 80#define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling 81 TIF_NEED_RESCHED */ 82#define TIF_BREAKPOINT 4 /* enter monitor mode on return */ 83#define TIF_SINGLE_STEP 5 /* single step in progress */ 84#define TIF_MEMDIE 6 /* is terminating due to OOM killer */ 85#define TIF_RESTORE_SIGMASK 7 /* restore signal mask in do_signal */ 86#define TIF_CPU_GOING_TO_SLEEP 8 /* CPU is entering sleep 0 mode */ 87#define TIF_NOTIFY_RESUME 9 /* callback before returning to user */ 88#define TIF_FREEZE 29 89#define TIF_DEBUG 30 /* debugging enabled */ 90#define TIF_USERSPACE 31 /* true if FS sets userspace */ 91 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_SINGLE_STEP (1 << TIF_SINGLE_STEP) 97#define _TIF_MEMDIE (1 << TIF_MEMDIE) 98#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK) 99#define _TIF_CPU_GOING_TO_SLEEP (1 << TIF_CPU_GOING_TO_SLEEP) 100#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 101#define _TIF_FREEZE (1 << TIF_FREEZE) 102 103/* Note: The masks below must never span more than 16 bits! */ 104 105/* work to do on interrupt/exception return */ 106#define _TIF_WORK_MASK \ 107 ((1 << TIF_SIGPENDING) \ 108 | _TIF_NOTIFY_RESUME \ 109 | (1 << TIF_NEED_RESCHED) \ 110 | (1 << TIF_POLLING_NRFLAG) \ 111 | (1 << TIF_BREAKPOINT) \ 112 | (1 << TIF_RESTORE_SIGMASK)) 113 114/* work to do on any return to userspace */ 115#define _TIF_ALLWORK_MASK (_TIF_WORK_MASK | (1 << TIF_SYSCALL_TRACE) | \ 116 _TIF_NOTIFY_RESUME) 117/* work to do on return from debug mode */ 118#define _TIF_DBGWORK_MASK (_TIF_WORK_MASK & ~(1 << TIF_BREAKPOINT)) 119 120#endif /* __ASM_AVR32_THREAD_INFO_H */ 121