of virtual address space, leaving userland with 3G, and update comments
to match the new reality.
We knew we were going to have to bite this bullet eventually, and there
are a couple of outstanding PRs related to this issue (9389 and 9313).
Complete solution to those PRs is going to involve some sort of run-time
decision on how large kmem_map should be, as well as changing some data
structure allocation strategies in UVM. However, this change will at
least allow the PR submitter to simply throw resources at the problem.
allocation strategy no longer works at all. Move pmap.new.* to pmap.*.
To read the revision history of PMAP_NEW up until this merge, use cvs
rlog of the old pmap.new.* files.
which set the LDT and share VM space (e.g. new versions of WINE) expect
the LDT to be logically coupled to the address space. Use the new pmap_fork()
interface to copy non-shared user-set LDTs when the address space is forked.
written by chuck cranor. thanks to mycroft for helping me find the
one little line of code i accidentally deleted while merging it.
this is not enabled by default. `options MACHINE_NEW_NONCONTIG'
will use this code. eventually, this should go into <machine/vmparam.h>
insteaed of MACHINE_NONCONTIG.
- New variables: biosextmem, biosbasemem, nkpde
- Above can be set by using the options BIOSEXTMEM, BIOSBASEMEM,
and NKPDE respectively (EXTMEM_SIZE is now called BIOSEXTMEM).
When preset this way, they won't be filled in / calculated.
- Readable by sysctl using machdep.nkpde, machdep.biosbasemem
and machdep.biosextmem.
- nkpde is calculated as:
min(NKPDE_MAX, NKPDE_BASE + (biosextmem >> 10) * NKPDE_SCALE)
Where NKPDE_MAX is 31, NKPDE_BASE is 4, NKPDE_SCALE = 1.
Map kernel stacks only at unique addresses.
Use one TSS per process.
Add sysarch calls for modifying IOPL and the I/O permission bitmap.
Add a compacting GDT entry allocator, for TSS and LDT selectors.
Enable modifying %fs and %gs with PT_SETREGS.
Sanitize various bits of code.
* Inline some functions.
* Eliminate redundant calls to pmap_page_index().
* Reduce the number of TLB flushes in accordance with the i386 SSWG.
* Inline pmap_remove() in pmap_remove_all(). (Most if it is unnecessary.)
* Allocate pv_entry's in pages, and keep a list of free entries in each page,
and a list of pages with free entries. (Trying to reduce malloc() overhead,
and improve locality of reference.)
* Remove a couple of macros that aren't really useful.
* Remove pmap_kernel() completely.
