[mirror_ubuntu-hirsute-kernel.git] / arch / riscv / include / asm / thread_info.h

/*
 * Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com>
 * Copyright (C) 2012 Regents of the University of California
 * Copyright (C) 2017 SiFive
 *
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU General Public License
 *   as published by the Free Software Foundation, version 2.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 */

#ifndef _ASM_RISCV_THREAD_INFO_H
#define _ASM_RISCV_THREAD_INFO_H

#include <asm/page.h>
#include <linux/const.h>

/* thread information allocation */
#define THREAD_SIZE_ORDER	(1)
#define THREAD_SIZE		(PAGE_SIZE << THREAD_SIZE_ORDER)

#ifndef __ASSEMBLY__

#include <asm/processor.h>
#include <asm/csr.h>

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
 * - if the members of this struct changes, the assembly constants
 *   in asm-offsets.c must be updated accordingly
 * - thread_info is included in task_struct at an offset of 0.  This means that
 *   tp points to both thread_info and task_struct.
 */
struct thread_info {
	unsigned long		flags;		/* low level flags */
	int                     preempt_count;  /* 0=>preemptible, <0=>BUG */
	mm_segment_t		addr_limit;
	/*
	 * These stack pointers are overwritten on every system call or
	 * exception.  SP is also saved to the stack it can be recovered when
	 * overwritten.
	 */
	long			kernel_sp;	/* Kernel stack pointer */
	long			user_sp;	/* User stack pointer */
	int			cpu;
};

/*
 * 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)			\
{						\
	.flags		= 0,			\
	.preempt_count	= INIT_PREEMPT_COUNT,	\
	.addr_limit	= KERNEL_DS,		\
}

#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 lowest half-word
 * - other flags in upper half-word(s)
 */
#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
#define TIF_NOTIFY_RESUME	1	/* callback before returning to user */
#define TIF_SIGPENDING		2	/* signal pending */
#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
#define TIF_RESTORE_SIGMASK	4	/* restore signal mask in do_signal() */
#define TIF_MEMDIE		5	/* is terminating due to OOM killer */
#define TIF_SYSCALL_TRACEPOINT  6       /* syscall tracepoint instrumentation */
#define TIF_SYSCALL_AUDIT	7	/* syscall auditing */

#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_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)
#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)

#define _TIF_WORK_MASK \
	(_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | _TIF_NEED_RESCHED)

#define _TIF_SYSCALL_WORK \
	(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT | _TIF_SYSCALL_AUDIT)

#endif /* _ASM_RISCV_THREAD_INFO_H */
Commit	Line	Data
7db91e57 PD	1	/*
	2	* Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com>
	3	* Copyright (C) 2012 Regents of the University of California
	4	* Copyright (C) 2017 SiFive
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation, version 2.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*/
	15
	16	#ifndef _ASM_RISCV_THREAD_INFO_H
	17	#define _ASM_RISCV_THREAD_INFO_H
	18
	19	#include <asm/page.h>
	20	#include <linux/const.h>
	21
	22	/* thread information allocation */
	23	#define THREAD_SIZE_ORDER (1)
	24	#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
	25
	26	#ifndef __ASSEMBLY__
	27
	28	#include <asm/processor.h>
	29	#include <asm/csr.h>
	30
5cfade5f CH	31	typedef struct {
	32	unsigned long seg;
	33	} mm_segment_t;
7db91e57 PD	34
	35	/*
	36	* low level task data that entry.S needs immediate access to
	37	* - this struct should fit entirely inside of one cache line
	38	* - if the members of this struct changes, the assembly constants
	39	* in asm-offsets.c must be updated accordingly
	40	* - thread_info is included in task_struct at an offset of 0. This means that
	41	* tp points to both thread_info and task_struct.
	42	*/
	43	struct thread_info {
	44	unsigned long flags; /* low level flags */
	45	int preempt_count; /* 0=>preemptible, <0=>BUG */
	46	mm_segment_t addr_limit;
	47	/*
	48	* These stack pointers are overwritten on every system call or
	49	* exception. SP is also saved to the stack it can be recovered when
	50	* overwritten.
	51	*/
	52	long kernel_sp; /* Kernel stack pointer */
	53	long user_sp; /* User stack pointer */
	54	int cpu;
	55	};
	56
	57	/*
	58	* macros/functions for gaining access to the thread information structure
	59	*
	60	* preempt_count needs to be 1 initially, until the scheduler is functional.
	61	*/
	62	#define INIT_THREAD_INFO(tsk) \
	63	{ \
	64	.flags = 0, \
	65	.preempt_count = INIT_PREEMPT_COUNT, \
	66	.addr_limit = KERNEL_DS, \
	67	}
	68
7db91e57 PD	69	#endif /* !__ASSEMBLY__ */
	70
	71	/*
	72	* thread information flags
	73	* - these are process state flags that various assembly files may need to
	74	* access
	75	* - pending work-to-be-done flags are in lowest half-word
	76	* - other flags in upper half-word(s)
	77	*/
	78	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
	79	#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
	80	#define TIF_SIGPENDING 2 /* signal pending */
	81	#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
	82	#define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */
	83	#define TIF_MEMDIE 5 /* is terminating due to OOM killer */
	84	#define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */
efe75c49	85	#define TIF_SYSCALL_AUDIT 7 /* syscall auditing */
7db91e57 PD	86
	87	#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
	88	#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
	89	#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
	90	#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
efe75c49 DA	91	#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
efe75c49 DA	92	#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
7db91e57 PD	93
	94	#define _TIF_WORK_MASK \
	95	(_TIF_NOTIFY_RESUME \| _TIF_SIGPENDING \| _TIF_NEED_RESCHED)
	96
efe75c49 DA	97	#define _TIF_SYSCALL_WORK \
	98	(_TIF_SYSCALL_TRACE \| _TIF_SYSCALL_TRACEPOINT \| _TIF_SYSCALL_AUDIT)
	99
7db91e57	100	#endif /* _ASM_RISCV_THREAD_INFO_H */