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sys/compat/linuxkpi/common/include/linux/highmem.h
- This file was added.
/*- | |||||
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD | |||||
* | |||||
* Copyright (c) 2010 Isilon Systems, Inc. | |||||
* Copyright (c) 2016 Matthew Macy (mmacy@mattmacy.io) | |||||
* Copyright (c) 2017 Mellanox Technologies, Ltd. | |||||
* Copyright (c) 2021 Vladimir Kondratyev <wulf@FreeBSD.org> | |||||
* | |||||
* 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 AUTHOR 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 AUTHOR 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 _LINUX_HIGHMEM_H_ | |||||
#define _LINUX_HIGHMEM_H_ | |||||
#include <sys/types.h> | |||||
#include <sys/lock.h> | |||||
#include <sys/mutex.h> | |||||
#include <sys/proc.h> | |||||
#include <sys/sched.h> | |||||
#include <sys/sf_buf.h> | |||||
#include <vm/vm.h> | |||||
#include <vm/vm_page.h> | |||||
#include <vm/pmap.h> | |||||
#include <linux/page.h> | |||||
#define PageHighMem(p) (0) | |||||
static inline vm_page_t | |||||
kmap_to_page(void *addr) | |||||
{ | |||||
return (virt_to_page(addr)); | |||||
} | |||||
static inline void * | |||||
kmap(vm_page_t page) | |||||
{ | |||||
struct sf_buf *sf; | |||||
if (PMAP_HAS_DMAP) { | |||||
return ((void *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(page))); | |||||
} else { | |||||
sched_pin(); | |||||
sf = sf_buf_alloc(page, SFB_NOWAIT | SFB_CPUPRIVATE); | |||||
if (sf == NULL) { | |||||
sched_unpin(); | |||||
return (NULL); | |||||
} | |||||
return ((void *)sf_buf_kva(sf)); | |||||
} | |||||
} | |||||
static inline void * | |||||
kmap_atomic_prot(vm_page_t page, pgprot_t prot) | |||||
{ | |||||
vm_memattr_t attr = pgprot2cachemode(prot); | |||||
if (attr != VM_MEMATTR_DEFAULT) { | |||||
vm_page_lock(page); | |||||
page->flags |= PG_FICTITIOUS; | |||||
vm_page_unlock(page); | |||||
pmap_page_set_memattr(page, attr); | |||||
} | |||||
return (kmap(page)); | |||||
} | |||||
static inline void * | |||||
kmap_atomic(vm_page_t page) | |||||
{ | |||||
return (kmap_atomic_prot(page, VM_PROT_ALL)); | |||||
} | |||||
static inline void | |||||
kunmap(vm_page_t page) | |||||
{ | |||||
struct sf_buf *sf; | |||||
if (!PMAP_HAS_DMAP) { | |||||
/* lookup SF buffer in list */ | |||||
sf = sf_buf_alloc(page, SFB_NOWAIT | SFB_CPUPRIVATE); | |||||
/* double-free */ | |||||
sf_buf_free(sf); | |||||
sf_buf_free(sf); | |||||
sched_unpin(); | |||||
} | |||||
} | |||||
static inline void | |||||
kunmap_atomic(void *vaddr) | |||||
{ | |||||
if (!PMAP_HAS_DMAP) | |||||
kunmap(virt_to_page(vaddr)); | |||||
} | |||||
#endif /* _LINUX_HIGHMEM_H_ */ |