/* SPDX-License-Identifier: GPL-2.0-or-later */
|
/*
|
* OpenRISC Linux
|
*
|
* Linux architectural port borrowing liberally from similar works of
|
* others. All original copyrights apply as per the original source
|
* declaration.
|
*
|
* OpenRISC implementation:
|
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
|
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
|
* et al.
|
*/
|
|
#ifndef _ASM_THREAD_INFO_H
|
#define _ASM_THREAD_INFO_H
|
|
#ifdef __KERNEL__
|
|
#ifndef __ASSEMBLY__
|
#include <asm/types.h>
|
#include <asm/processor.h>
|
#endif
|
|
|
/* THREAD_SIZE is the size of the task_struct/kernel_stack combo.
|
* normally, the stack is found by doing something like p + THREAD_SIZE
|
* in or32, a page is 8192 bytes, which seems like a sane size
|
*/
|
|
#define THREAD_SIZE_ORDER 0
|
#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
|
|
/*
|
* 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
|
*/
|
#ifndef __ASSEMBLY__
|
|
typedef unsigned long mm_segment_t;
|
|
struct thread_info {
|
struct task_struct *task; /* main task structure */
|
unsigned long flags; /* low level flags */
|
__u32 cpu; /* current CPU */
|
__s32 preempt_count; /* 0 => preemptable, <0 => BUG */
|
|
mm_segment_t addr_limit; /* thread address space:
|
0-0x7FFFFFFF for user-thead
|
0-0xFFFFFFFF for kernel-thread
|
*/
|
__u8 supervisor_stack[0];
|
|
/* saved context data */
|
unsigned long ksp;
|
};
|
#endif
|
|
/*
|
* macros/functions for gaining access to the thread information structure
|
*
|
* preempt_count needs to be 1 initially, until the scheduler is functional.
|
*/
|
#ifndef __ASSEMBLY__
|
#define INIT_THREAD_INFO(tsk) \
|
{ \
|
.task = &tsk, \
|
.flags = 0, \
|
.cpu = 0, \
|
.preempt_count = INIT_PREEMPT_COUNT, \
|
.addr_limit = KERNEL_DS, \
|
.ksp = 0, \
|
}
|
|
/* how to get the thread information struct from C */
|
register struct thread_info *current_thread_info_reg asm("r10");
|
#define current_thread_info() (current_thread_info_reg)
|
|
#define get_thread_info(ti) get_task_struct((ti)->task)
|
#define put_thread_info(ti) put_task_struct((ti)->task)
|
|
#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_SINGLESTEP 4 /* restore singlestep on return to user
|
* mode
|
*/
|
#define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */
|
#define TIF_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation */
|
#define TIF_RESTORE_SIGMASK 9
|
#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling * TIF_NEED_RESCHED
|
*/
|
#define TIF_MEMDIE 17
|
|
#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_SINGLESTEP (1<<TIF_SINGLESTEP)
|
#define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL)
|
#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
|
|
|
/* Work to do when returning from interrupt/exception */
|
/* For OpenRISC, this is anything in the LSW other than syscall trace */
|
#define _TIF_WORK_MASK (0xff & ~(_TIF_SYSCALL_TRACE|_TIF_SINGLESTEP))
|
|
#endif /* __KERNEL__ */
|
|
#endif /* _ASM_THREAD_INFO_H */
|
