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/*
* Copyright 2004-2010 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#ifndef _ASM_THREAD_INFO_H
#define _ASM_THREAD_INFO_H
#include <asm/page.h>
#include <asm/entry.h>
#include <asm/l1layout.h>
#include <linux/compiler.h>
#ifdef __KERNEL__
/* Thread Align Mask to reach to the top of the stack
* for any process
*/
#define ALIGN_PAGE_MASK 0xffffe000
/*
* Size of kernel stack for each process. This must be a power of 2...
*/
#define THREAD_SIZE_ORDER 1
#define THREAD_SIZE 8192 /* 2 pages */
#define STACK_WARN (THREAD_SIZE/8)
#ifndef __ASSEMBLY__
typedef unsigned long mm_segment_t;
/*
* low level task data.
* If you change this, change the TI_* offsets below to match.
*/
struct thread_info {
struct task_struct *task; /* main task structure */
struct exec_domain *exec_domain; /* execution domain */
unsigned long flags; /* low level flags */
int cpu; /* cpu we're on */
int preempt_count; /* 0 => preemptable, <0 => BUG */
mm_segment_t addr_limit; /* address limit */
struct restart_block restart_block;
#ifndef CONFIG_SMP
struct l1_scratch_task_info l1_task_info;
#endif
};
/*
* macros/functions for gaining access to the thread information structure
*/
#define INIT_THREAD_INFO(tsk) \
{ \
.task = &tsk, \
.exec_domain = &default_exec_domain, \
.flags = 0, \
.cpu = 0, \
.preempt_count = INIT_PREEMPT_COUNT, \
.restart_block = { \
.fn = do_no_restart_syscall, \
}, \
}
#define init_thread_info (init_thread_union.thread_info)
#define init_stack (init_thread_union.stack)
/* Given a task stack pointer, you can find its corresponding
* thread_info structure just by masking it to the THREAD_SIZE
* boundary (currently 8K as you can see above).
*/
__attribute_const__
static inline struct thread_info *current_thread_info(void)
{
struct thread_info *ti;
__asm__("%0 = sp;" : "=da"(ti));
return (struct thread_info *)((long)ti & ~((long)THREAD_SIZE-1));
}
#endif /* __ASSEMBLY__ */
/*
* Offsets in thread_info structure, used in assembly code
*/
#define TI_TASK 0
#define TI_EXECDOMAIN 4
#define TI_FLAGS 8
#define TI_CPU 12
#define TI_PREEMPT 16
#define PREEMPT_ACTIVE 0x4000000
/*
* thread information flag bit numbers
*/
#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
#define TIF_SIGPENDING 1 /* signal pending */
#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
#define TIF_MEMDIE 4 /* is terminating due to OOM killer */
#define TIF_RESTORE_SIGMASK 5 /* restore signal mask in do_signal() */
#define TIF_IRQ_SYNC 7 /* sync pipeline stage */
#define TIF_NOTIFY_RESUME 8 /* callback before returning to user */
#define TIF_SINGLESTEP 9
/* as above, but as bit values */
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
#define _TIF_IRQ_SYNC (1<<TIF_IRQ_SYNC)
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
#endif /* __KERNEL__ */
#endif /* _ASM_THREAD_INFO_H */
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