1 /* 2 * Copyright 2004-2010 Analog Devices Inc. 3 * 4 * Licensed under the GPL-2 or later. 5 */ 6 7 #ifndef _ASM_THREAD_INFO_H 8 #define _ASM_THREAD_INFO_H 9 10 #include <asm/page.h> 11 #include <asm/entry.h> 12 #include <asm/l1layout.h> 13 #include <linux/compiler.h> 14 15 #ifdef __KERNEL__ 16 17 /* Thread Align Mask to reach to the top of the stack 18 * for any process 19 */ 20 #define ALIGN_PAGE_MASK 0xffffe000 21 22 /* 23 * Size of kernel stack for each process. This must be a power of 2... 24 */ 25 #define THREAD_SIZE_ORDER 1 26 #define THREAD_SIZE 8192 /* 2 pages */ 27 #define STACK_WARN (THREAD_SIZE/8) 28 29 #ifndef __ASSEMBLY__ 30 31 typedef unsigned long mm_segment_t; 32 33 /* 34 * low level task data. 35 * If you change this, change the TI_* offsets below to match. 36 */ 37 38 struct thread_info { 39 struct task_struct *task; /* main task structure */ 40 unsigned long flags; /* low level flags */ 41 int cpu; /* cpu we're on */ 42 int preempt_count; /* 0 => preemptable, <0 => BUG */ 43 mm_segment_t addr_limit; /* address limit */ 44 #ifndef CONFIG_SMP 45 struct l1_scratch_task_info l1_task_info; 46 #endif 47 }; 48 49 /* 50 * macros/functions for gaining access to the thread information structure 51 */ 52 #define INIT_THREAD_INFO(tsk) \ 53 { \ 54 .task = &tsk, \ 55 .flags = 0, \ 56 .cpu = 0, \ 57 .preempt_count = INIT_PREEMPT_COUNT, \ 58 } 59 #define init_thread_info (init_thread_union.thread_info) 60 #define init_stack (init_thread_union.stack) 61 62 /* Given a task stack pointer, you can find its corresponding 63 * thread_info structure just by masking it to the THREAD_SIZE 64 * boundary (currently 8K as you can see above). 65 */ 66 __attribute_const__ current_thread_info(void)67static inline struct thread_info *current_thread_info(void) 68 { 69 struct thread_info *ti; 70 __asm__("%0 = sp;" : "=da"(ti)); 71 return (struct thread_info *)((long)ti & ~((long)THREAD_SIZE-1)); 72 } 73 74 #endif /* __ASSEMBLY__ */ 75 76 /* 77 * thread information flag bit numbers 78 */ 79 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 80 #define TIF_SIGPENDING 1 /* signal pending */ 81 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ 82 #define TIF_MEMDIE 4 /* is terminating due to OOM killer */ 83 #define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */ 84 #define TIF_IRQ_SYNC 7 /* sync pipeline stage */ 85 #define TIF_NOTIFY_RESUME 8 /* callback before returning to user */ 86 #define TIF_SINGLESTEP 9 87 88 /* as above, but as bit values */ 89 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 90 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 91 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 92 #define _TIF_IRQ_SYNC (1<<TIF_IRQ_SYNC) 93 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 94 #define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP) 95 96 #define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */ 97 98 #endif /* __KERNEL__ */ 99 100 #endif /* _ASM_THREAD_INFO_H */ 101