svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.
pmap_enter(9)
PMAP_ENTER(9) BSD Kernel Developer's Manual PMAP_ENTER(9)
NAME
pmap_enter — insert a virtual page into a physical map
SYNOPSIS
#include <sys/param.h>
#include <vm/vm.h>
#include <vm/pmap.h>
int
pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot,
u_int flags, int8_t psind);
DESCRIPTION
The pmap_enter() function creates a mapping in the physical map pmap from
the virtual address va to the physical page m with the protection prot.
Any previous mapping at the virtual address va is destroyed.
The flags argument may have the following values:
VM_PROT_READ A read access to the given virtual address triggered
the call.
VM_PROT_WRITE A write access to the given virtual address triggered
the call.
VM_PROT_EXECUTE An execute access to the given virtual address trig‐
gered the call.
PMAP_ENTER_WIRED The mapping should be marked as wired.
PMAP_ENTER_NOSLEEP This function may not sleep during creation of the
mapping. If the mapping cannot be created without
sleeping, an appropriate Mach VM error is returned.
If the PMAP_ENTER_NOSLEEP flag is not specified, this function must cre‐
ate the requested mapping before returning. It may not fail. In order
to create the requested mapping, this function may destroy any non-wired
mapping in any pmap.
The psind parameter specifies the page size that should be used by the
mapping. The supported page sizes are described by the global array
pagesizes[]. The desired page size is specified by passing the index of
the array element that equals the desired page size.
When the pmap_enter() function destroys or updates a managed mapping,
including an existing mapping at virtual address va, it updates the
vm_page structure corresponding to the previously mapped physical page.
If the physical page was accessed through the managed mapping, then the
vm_page structure's PGA_REFERENCED aflag is set. If the physical page
was modified through the managed mapping, then the vm_page_dirty() func‐
tion is called on the vm_page structure.
The PGA_WRITEABLE aflag must be set for the page m if the new mapping is
managed and writeable. It is advised to clear PGA_WRITEABLE for
destroyed mappings if the implementation can ensure that no other write‐
able managed mappings for the previously mapped pages exist.
If the page m is managed, the page must be busied by the caller or the
owning object must be locked. In the later case, the PMAP_ENTER_NOSLEEP
must be specified by the caller.
The pmap_enter() function must handle the multiprocessor TLB consistency
for the given address.
NOTES
On arm and i386 architectures the existing implementation of the
pmap_enter function is incomplete, only value 0 for psind is supported.
Other supported architectures, except amd64, have pagesizes[] array of
size 1.
RETURN VALUES
If successful, the pmap_enter() function returns KERN_SUCCESS. If the
PMAP_ENTER_NOSLEEP flag was specified and the resources required for the
mapping cannot be acquired without sleeping, KERN_RESOURCE_SHORTAGE is
returned.
SEE ALSO
pmap(9)
AUTHORS
This manual page was first written by Bruce M Simpson <bms@spc.org> and
then rewritten by
Alan Cox <alc@FreeBSD.org> and
Konstantin Belousov <kib@FreeBSD.org>.
BSD February 16, 2018 BSD