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-.\" Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
-.\" All rights reserved.
-.\"
-.\" 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.
-.\" 3. Neither the name of Hyra nor the names of its
-.\" contributors may be used to endorse or promote products derived from
-.\" this software without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
-.Dd Mar 13 2024
-.Dt PMAP 9
-.Os Hyra
-.Sh NAME
-.Nm pmap - hyra machine dependent virtual memory layer
-.Sh SYNOPSIS
-.In vm/pmap.h
-
-.Bd -literal
-int pmap_map(struct vm_ctx *, vaddr_t, paddr_t, vm_prot_t);
-int pmap_unmap(struct vm_ctx *, vaddr_t);
-.Ed
-
-.Sh DESCRIPTION
-The machine dependent virtual memory layer contains a standard set of
-functions that shall be implemented per architecture and left alone
-outside of vm(9). vm(9) uses pmap routines internally which allows for
-abstracting away machine dependent details.
-
-The
-.Ft pmap_map()
-function is used to map a physical address (paddr_t) to
-a virtual address (vaddr_t). The argument of type
-vm_prot_t is used to give a mapping certain access
-rules. These rules are described below:
-
-The
-.Ft PROT_WRITABLE
-bit tells pmap_map() to allow writes to the page.
-Writes to pages without this bit will result in an exception,
-on AMD64 a #PF will occur.
-
-The
-.Ft PROT_EXEC
-bit tells pmap_map() to allow this page to be
-executable. On platforms like AMD64, execution of pages
-without this bit will result in an exception from the
-instruction fetch, for AMD64, a #PF will occur.
-
-The
-.Ft pmap_unmap()
-function is used to unmap a virtual address which
-leaves the address invalid.
-
-.Sh AUTHORS
-.An Ian Moffett Aq Mt ian@osmora.org
-
-.Sh SEE ALSO
-.Xr vm 9