/* 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 __ASSEMBLER__
#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 or1k , 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 __ASSEMBLER__
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 */
__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 __ASSEMBLER__
#define INIT_THREAD_INFO(tsk) \
{ \
.task = &tsk, \
.flags = 0 , \
.cpu = 0 , \
.preempt_count = INIT_PREEMPT_COUNT, \
.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 /* !__ASSEMBLER__ */
/*
* 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 (0 xff & ~(_TIF_SYSCALL_TRACE|_TIF_SINGLESTEP))
#endif /* __KERNEL__ */
#endif /* _ASM_THREAD_INFO_H */
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