d88e4cb671
Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: linux-arch@vger.kernel.org
121 lines
3.2 KiB
C
121 lines
3.2 KiB
C
/*
|
|
* 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_POLLING_NRFLAG 3 /* true if poll_idle() is polling
|
|
TIF_NEED_RESCHED */
|
|
#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_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
|
|
#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
|
|
#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 */
|