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/* $NetBSD: vmpagemd.h,v 1.17 2020/12/20 16:38:26 skrll Exp $ */
/*-
* Copyright (c) 2011 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Raytheon BBN Technologies Corp and Defense Advanced Research Projects
* Agency and which was developed by Matt Thomas of 3am Software Foundry.
*
* This material is based upon work supported by the Defense Advanced Research
* Projects Agency and Space and Naval Warfare Systems Center, Pacific, under
* Contract No. N66001-09-C-2073.
* Approved for Public Release, Distribution Unlimited
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _UVM_PMAP_VMPAGEMD_H_
#define _UVM_PMAP_VMPAGEMD_H_
#ifdef _LOCORE
#error use assym.h instead
#endif
//#ifdef _MODULE
//#error this file should not be included by loadable kernel modules
//#endif
#ifdef _KERNEL_OPT
#include "opt_modular.h"
#include "opt_multiprocessor.h"
#endif
#include <sys/atomic.h>
#include <sys/mutex.h>
#define __HAVE_VM_PAGE_MD
typedef struct pv_entry {
struct pv_entry *pv_next;
struct pmap *pv_pmap;
vaddr_t pv_va;
#define PV_KENTER __BIT(0)
} *pv_entry_t;
#define PV_ISKENTER_P(pv) (((pv->pv_va) & PV_KENTER) != 0)
#ifndef _MODULE
#define VM_PAGEMD_VMPAGE __BIT(0) /* page is vm managed */
#define VM_PAGEMD_REFERENCED __BIT(1) /* page has been referenced */
#define VM_PAGEMD_MODIFIED __BIT(2) /* page has been modified */
#define VM_PAGEMD_POOLPAGE __BIT(3) /* page is used as a poolpage */
#define VM_PAGEMD_EXECPAGE __BIT(4) /* page is exec mapped */
#ifdef PMAP_VIRTUAL_CACHE_ALIASES
#define VM_PAGEMD_UNCACHED __BIT(5) /* page is mapped uncached */
#endif
#define VM_PAGEMD_VMPAGE_P(mdpg) (((mdpg)->mdpg_attrs & VM_PAGEMD_VMPAGE) != 0)
#define VM_PAGEMD_REFERENCED_P(mdpg) (((mdpg)->mdpg_attrs & VM_PAGEMD_REFERENCED) != 0)
#define VM_PAGEMD_MODIFIED_P(mdpg) (((mdpg)->mdpg_attrs & VM_PAGEMD_MODIFIED) != 0)
#define VM_PAGEMD_POOLPAGE_P(mdpg) (((mdpg)->mdpg_attrs & VM_PAGEMD_POOLPAGE) != 0)
#define VM_PAGEMD_EXECPAGE_P(mdpg) (((mdpg)->mdpg_attrs & VM_PAGEMD_EXECPAGE) != 0)
#ifdef PMAP_VIRTUAL_CACHE_ALIASES
#define VM_PAGEMD_CACHED_P(mdpg) (((mdpg)->mdpg_attrs & VM_PAGEMD_UNCACHED) == 0)
#define VM_PAGEMD_UNCACHED_P(mdpg) (((mdpg)->mdpg_attrs & VM_PAGEMD_UNCACHED) != 0)
#endif
#endif /* !_MODULE */
struct vm_page_md {
volatile unsigned long mdpg_attrs; /* page attributes */
struct pv_entry mdpg_first; /* pv_entry first */
#if defined(MULTIPROCESSOR) || defined(MODULAR) || defined(_MODULE)
kmutex_t *mdpg_lock; /* pv list lock */
#endif
};
#ifndef _MODULE
#if defined(MULTIPROCESSOR) || defined(MODULAR)
#define VM_PAGEMD_PVLIST_LOCK_INIT(mdpg) (mdpg)->mdpg_lock = NULL
#else
#define VM_PAGEMD_PVLIST_LOCK_INIT(mdpg) __nothing
#endif /* MULTIPROCESSOR || MODULAR */
#define VM_PAGEMD_PVLIST_LOCK(mdpg) pmap_pvlist_lock(mdpg, 1)
#define VM_PAGEMD_PVLIST_READLOCK(mdpg) pmap_pvlist_lock(mdpg, 0)
#define VM_PAGEMD_PVLIST_UNLOCK(mdpg) pmap_pvlist_unlock(mdpg)
#define VM_PAGEMD_PVLIST_LOCKED_P(mdpg) pmap_pvlist_locked_p(mdpg)
#define VM_PAGEMD_PVLIST_GEN(mdpg) ((mdpg)->mdpg_attrs >> 16)
#define VM_PAGEMD_PVLIST_EMPTY_P(mdpg) ((mdpg)->mdpg_first.pv_pmap == NULL)
#ifdef _KERNEL
#if defined(MULTIPROCESSOR) || defined(MODULAR)
kmutex_t *pmap_pvlist_lock_addr(struct vm_page_md *);
#else
extern kmutex_t pmap_pvlist_mutex;
static __inline kmutex_t *
pmap_pvlist_lock_addr(struct vm_page_md *mdpg)
{
return &pmap_pvlist_mutex;
}
#endif
static __inline uintptr_t
pmap_pvlist_lock(struct vm_page_md *mdpg, uintptr_t increment)
{
mutex_spin_enter(pmap_pvlist_lock_addr(mdpg));
const uintptr_t gen = VM_PAGEMD_PVLIST_GEN(mdpg);
mdpg->mdpg_attrs += increment << 16;
return gen;
}
static __inline uintptr_t
pmap_pvlist_unlock(struct vm_page_md *mdpg)
{
const uintptr_t gen = VM_PAGEMD_PVLIST_GEN(mdpg);
mutex_spin_exit(pmap_pvlist_lock_addr(mdpg));
return gen;
}
static __inline bool
pmap_pvlist_locked_p(struct vm_page_md *mdpg)
{
return mutex_owned(pmap_pvlist_lock_addr(mdpg));
}
#endif /* _KERNEL */
#define VM_MDPAGE_INIT(pg) \
do { \
(pg)->mdpage.mdpg_first.pv_next = NULL; \
(pg)->mdpage.mdpg_first.pv_pmap = NULL; \
(pg)->mdpage.mdpg_first.pv_va = VM_PAGE_TO_PHYS(pg); \
(pg)->mdpage.mdpg_attrs = VM_PAGEMD_VMPAGE; \
VM_PAGEMD_PVLIST_LOCK_INIT(&(pg)->mdpage); \
} while (/* CONSTCOND */ 0)
#endif /* _MODULE */
#endif /* _UVM_PMAP_VMPAGEMD_H_ */
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