pmap_qenter, pmap_qremove — manage temporary kernel space mappings
pmap_qenter(vm_offset_t sva, vm_page_t *m, int count);
pmap_qremove(vm_offset_t sva, int count);
The pmap_qenter() function accepts a linear array of count pointers to wired pages *m, and enters each of these pages into the kernel virtual address (KVA) space, beginning at the address sva. The pages are mapped non-executable, if possible. (For example, non-PAE i386 has no capability to map pages non-executable.)
The pmap_qremove() function tears out a mapping from the kernel virtual address space, beginning at sva and for count pages.
The pmap_qenter() function is intended for temporary mappings that do not require page modification or reference counting. Old mappings are simply overwritten. The pages must be wired into physical memory.
The corresponding pmap_qremove() function is intended to remove such temporary mappings.
This manual page was written by Bruce M Simpson <bms [AT] spc.org>.
BSD February 15, 2018 BSD