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 31typedef 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 38struct 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__ 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