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/* $OpenBSD: highmem.h,v 1.1 2019/04/14 10:14:53 jsg Exp $ */
/*
* Copyright (c) 2013, 2014, 2015 Mark Kettenis
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _LINUX_HIGHMEM_H
#define _LINUX_HIGHMEM_H
#include <uvm/uvm_extern.h>
#include <linux/uaccess.h>
void *kmap(struct vm_page *);
void kunmap(void *addr);
#define kmap_to_page(ptr) (ptr)
#if defined(__i386__) || defined(__amd64__)
static inline void *
kmap_atomic(struct vm_page *pg)
{
vaddr_t va;
#if defined (__HAVE_PMAP_DIRECT)
va = pmap_map_direct(pg);
#else
extern vaddr_t pmap_tmpmap_pa(paddr_t);
va = pmap_tmpmap_pa(VM_PAGE_TO_PHYS(pg));
#endif
return (void *)va;
}
static inline void
kunmap_atomic(void *addr)
{
#if defined (__HAVE_PMAP_DIRECT)
pmap_unmap_direct((vaddr_t)addr);
#else
extern void pmap_tmpunmap_pa(void);
pmap_tmpunmap_pa();
#endif
}
#endif /* defined(__i386__) || defined(__amd64__) */
#endif
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