/* SPDX-License-Identifier: GPL-2.0-only */
|
/*
|
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
|
*
|
* Vineetg: Oct 2009
|
* No need for ARC specific thread_info allocator (kmalloc/free). This is
|
* anyways one page allocation, thus slab alloc can be short-circuited and
|
* the generic version (get_free_page) would be loads better.
|
*
|
* Sameer Dhavale: Codito Technologies 2004
|
*/
|
|
#ifndef _ASM_THREAD_INFO_H
|
#define _ASM_THREAD_INFO_H
|
|
#include <asm/page.h>
|
|
#ifdef CONFIG_16KSTACKS
|
#define THREAD_SIZE_ORDER 1
|
#else
|
#define THREAD_SIZE_ORDER 0
|
#endif
|
|
#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
|
#define THREAD_SHIFT (PAGE_SHIFT << THREAD_SIZE_ORDER)
|
|
#ifndef __ASSEMBLY__
|
|
#include <linux/thread_info.h>
|
#include <asm/segment.h>
|
|
/*
|
* low level task data that entry.S needs immediate access to
|
* - this struct should fit entirely inside of one cache line
|
* - this struct shares the supervisor stack pages
|
* - if the contents of this structure are changed, the assembly constants
|
* must also be changed
|
*/
|
struct thread_info {
|
unsigned long flags; /* low level flags */
|
int preempt_count; /* 0 => preemptable, <0 => BUG */
|
struct task_struct *task; /* main task structure */
|
mm_segment_t addr_limit; /* thread address space */
|
__u32 cpu; /* current CPU */
|
unsigned long thr_ptr; /* TLS ptr */
|
};
|
|
/*
|
* macros/functions for gaining access to the thread information structure
|
*
|
* preempt_count needs to be 1 initially, until the scheduler is functional.
|
*/
|
#define INIT_THREAD_INFO(tsk) \
|
{ \
|
.task = &tsk, \
|
.flags = 0, \
|
.cpu = 0, \
|
.preempt_count = INIT_PREEMPT_COUNT, \
|
.addr_limit = KERNEL_DS, \
|
}
|
|
static inline __attribute_const__ struct thread_info *current_thread_info(void)
|
{
|
register unsigned long sp asm("sp");
|
return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
|
}
|
|
#endif /* !__ASSEMBLY__ */
|
|
/*
|
* thread information flags
|
* - these are process state flags that various assembly files may need to
|
* access
|
* - pending work-to-be-done flags are in LSW
|
* - other flags in MSW
|
*/
|
#define TIF_RESTORE_SIGMASK 0 /* restore sig mask in do_signal() */
|
#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
|
#define TIF_SIGPENDING 2 /* signal pending */
|
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
|
#define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
|
#define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */
|
#define TIF_SYSCALL_TRACE 15 /* syscall trace active */
|
|
/* true if poll_idle() is polling TIF_NEED_RESCHED */
|
#define TIF_MEMDIE 16
|
|
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
|
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
|
#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
|
#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
|
#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
|
#define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL)
|
#define _TIF_MEMDIE (1<<TIF_MEMDIE)
|
|
/* work to do on interrupt/exception return */
|
#define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
|
_TIF_NOTIFY_RESUME | _TIF_NOTIFY_SIGNAL)
|
|
/*
|
* _TIF_ALLWORK_MASK includes SYSCALL_TRACE, but we don't need it.
|
* SYSCALL_TRACE is anyway seperately/unconditionally tested right after a
|
* syscall, so all that reamins to be tested is _TIF_WORK_MASK
|
*/
|
|
#endif /* _ASM_THREAD_INFO_H */
|
