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 19 struct task_struct; 20 21 struct thread_info { 22 struct task_struct *task; /* main task structure */ 23 unsigned long flags; /* low level flags */ 24 __u32 cpu; 25 __s32 preempt_count; /* 0 => preemptable, <0 => BUG */ 26 __u32 rar_saved; /* return address... */ 27 __u32 rsr_saved; /* ...and status register 28 saved by debug handler 29 when setting up 30 trampoline */ 31 __u8 supervisor_stack[0]; 32 }; 33 34 #define INIT_THREAD_INFO(tsk) \ 35 { \ 36 .task = &tsk, \ 37 .flags = 0, \ 38 .cpu = 0, \ 39 .preempt_count = INIT_PREEMPT_COUNT, \ 40 } 41 42 #define init_thread_info (init_thread_union.thread_info) 43 #define init_stack (init_thread_union.stack) 44 45 /* 46 * Get the thread information struct from C. 47 * We do the usual trick and use the lower end of the stack for this 48 */ current_thread_info(void)49static inline struct thread_info *current_thread_info(void) 50 { 51 unsigned long addr = ~(THREAD_SIZE - 1); 52 53 asm("and %0, sp" : "=r"(addr) : "0"(addr)); 54 return (struct thread_info *)addr; 55 } 56 57 #define get_thread_info(ti) get_task_struct((ti)->task) 58 #define put_thread_info(ti) put_task_struct((ti)->task) 59 60 #endif /* !__ASSEMBLY__ */ 61 62 /* 63 * Thread information flags 64 * - these are process state flags that various assembly files may need to access 65 * - pending work-to-be-done flags are in LSW 66 * - other flags in MSW 67 */ 68 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 69 #define TIF_SIGPENDING 1 /* signal pending */ 70 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 71 #define TIF_BREAKPOINT 4 /* enter monitor mode on return */ 72 #define TIF_SINGLE_STEP 5 /* single step in progress */ 73 #define TIF_MEMDIE 6 /* is terminating due to OOM killer */ 74 #define TIF_RESTORE_SIGMASK 7 /* restore signal mask in do_signal */ 75 #define TIF_CPU_GOING_TO_SLEEP 8 /* CPU is entering sleep 0 mode */ 76 #define TIF_NOTIFY_RESUME 9 /* callback before returning to user */ 77 #define TIF_DEBUG 30 /* debugging enabled */ 78 #define TIF_USERSPACE 31 /* true if FS sets userspace */ 79 80 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 81 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 82 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 83 #define _TIF_BREAKPOINT (1 << TIF_BREAKPOINT) 84 #define _TIF_SINGLE_STEP (1 << TIF_SINGLE_STEP) 85 #define _TIF_MEMDIE (1 << TIF_MEMDIE) 86 #define _TIF_CPU_GOING_TO_SLEEP (1 << TIF_CPU_GOING_TO_SLEEP) 87 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 88 89 /* Note: The masks below must never span more than 16 bits! */ 90 91 /* work to do on interrupt/exception return */ 92 #define _TIF_WORK_MASK \ 93 (_TIF_SIGPENDING \ 94 | _TIF_NOTIFY_RESUME \ 95 | _TIF_NEED_RESCHED \ 96 | _TIF_BREAKPOINT) 97 98 /* work to do on any return to userspace */ 99 #define _TIF_ALLWORK_MASK (_TIF_WORK_MASK | _TIF_SYSCALL_TRACE) 100 /* work to do on return from debug mode */ 101 #define _TIF_DBGWORK_MASK (_TIF_WORK_MASK & ~_TIF_BREAKPOINT) 102 103 #endif /* __ASM_AVR32_THREAD_INFO_H */ 104