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 struct restart_block restart_block; 29 __u8 supervisor_stack[0]; 30}; 31 32#define INIT_THREAD_INFO(tsk) \ 33{ \ 34 .task = &tsk, \ 35 .exec_domain = &default_exec_domain, \ 36 .flags = 0, \ 37 .cpu = 0, \ 38 .preempt_count = 1, \ 39 .restart_block = { \ 40 .fn = do_no_restart_syscall \ 41 } \ 42} 43 44#define init_thread_info (init_thread_union.thread_info) 45#define init_stack (init_thread_union.stack) 46 47/* 48 * Get the thread information struct from C. 49 * We do the usual trick and use the lower end of the stack for this 50 */ 51static inline struct thread_info *current_thread_info(void) 52{ 53 unsigned long addr = ~(THREAD_SIZE - 1); 54 55 asm("and %0, sp" : "=r"(addr) : "0"(addr)); 56 return (struct thread_info *)addr; 57} 58 59/* thread information allocation */ 60#define alloc_thread_info(ti) \ 61 ((struct thread_info *) __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER)) 62#define free_thread_info(ti) free_pages((unsigned long)(ti), 1) 63#define get_thread_info(ti) get_task_struct((ti)->task) 64#define put_thread_info(ti) put_task_struct((ti)->task) 65 66#endif /* !__ASSEMBLY__ */ 67 68#define PREEMPT_ACTIVE 0x40000000 69 70/* 71 * Thread information flags 72 * - these are process state flags that various assembly files may need to access 73 * - pending work-to-be-done flags are in LSW 74 * - other flags in MSW 75 */ 76#define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 77#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */ 78#define TIF_SIGPENDING 2 /* signal pending */ 79#define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 80#define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling 81 TIF_NEED_RESCHED */ 82#define TIF_BREAKPOINT 5 /* true if we should break after return */ 83#define TIF_SINGLE_STEP 6 /* single step after next break */ 84#define TIF_MEMDIE 7 85#define TIF_RESTORE_SIGMASK 8 /* restore signal mask in do_signal */ 86#define TIF_CPU_GOING_TO_SLEEP 9 /* CPU is entering sleep 0 mode */ 87#define TIF_USERSPACE 31 /* true if FS sets userspace */ 88 89#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 90#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 91#define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 92#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 93#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) 94#define _TIF_BREAKPOINT (1 << TIF_BREAKPOINT) 95#define _TIF_SINGLE_STEP (1 << TIF_SINGLE_STEP) 96#define _TIF_MEMDIE (1 << TIF_MEMDIE) 97#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK) 98#define _TIF_CPU_GOING_TO_SLEEP (1 << TIF_CPU_GOING_TO_SLEEP) 99 100/* work to do on interrupt/exception return */ 101#define _TIF_WORK_MASK 0x0000013e 102/* work to do on any return to userspace */ 103#define _TIF_ALLWORK_MASK 0x0000013f 104/* work to do on return from debug mode */ 105#define _TIF_DBGWORK_MASK 0x0000017e 106 107#endif /* __ASM_AVR32_THREAD_INFO_H */ 108