115 строки
3.4 KiB
C
115 строки
3.4 KiB
C
/*
|
|
* NiosII low-level thread information
|
|
*
|
|
* Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
|
|
* Copyright (C) 2004 Microtronix Datacom Ltd.
|
|
*
|
|
* Based on asm/thread_info_no.h from m68k which is:
|
|
*
|
|
* Copyright (C) 2002 David Howells <dhowells@redhat.com>
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
|
|
#ifndef _ASM_NIOS2_THREAD_INFO_H
|
|
#define _ASM_NIOS2_THREAD_INFO_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
/*
|
|
* Size of the kernel stack for each process.
|
|
*/
|
|
#define THREAD_SIZE_ORDER 1
|
|
#define THREAD_SIZE 8192 /* 2 * PAGE_SIZE */
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
typedef struct {
|
|
unsigned long seg;
|
|
} mm_segment_t;
|
|
|
|
/*
|
|
* 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 {
|
|
struct task_struct *task; /* main task structure */
|
|
unsigned long flags; /* low level flags */
|
|
__u32 cpu; /* current CPU */
|
|
int preempt_count; /* 0 => preemptable,<0 => BUG */
|
|
mm_segment_t addr_limit; /* thread address space:
|
|
0-0x7FFFFFFF for user-thead
|
|
0-0xFFFFFFFF for kernel-thread
|
|
*/
|
|
struct pt_regs *regs;
|
|
};
|
|
|
|
/*
|
|
* 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, \
|
|
}
|
|
|
|
#define init_thread_info (init_thread_union.thread_info)
|
|
#define init_stack (init_thread_union.stack)
|
|
|
|
/* how to get the thread information struct from C */
|
|
static inline 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_SYSCALL_TRACE 0 /* syscall trace active */
|
|
#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
|
|
#define TIF_SIGPENDING 2 /* signal pending */
|
|
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
|
|
#define TIF_MEMDIE 4 /* is terminating due to OOM killer */
|
|
#define TIF_SECCOMP 5 /* secure computing */
|
|
#define TIF_SYSCALL_AUDIT 6 /* syscall auditing active */
|
|
#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
|
|
|
|
#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling
|
|
TIF_NEED_RESCHED */
|
|
|
|
#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_SECCOMP (1 << TIF_SECCOMP)
|
|
#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
|
|
#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
|
|
#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
|
|
|
|
/* work to do on interrupt/exception return */
|
|
#define _TIF_WORK_MASK 0x0000FFFE
|
|
|
|
/* work to do on any return to u-space */
|
|
# define _TIF_ALLWORK_MASK 0x0000FFFF
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _ASM_NIOS2_THREAD_INFO_H */
|