CVS commit: src/sys/arch

["Maxime Villard" <maxv%netbsd.org@localhost>]

Module Name:    src
Committed By:   maxv
Date:           Fri Jul 22 14:08:33 UTC 2016

Modified Files:
        src/sys/arch/amd64/amd64: machdep.c
        src/sys/arch/amd64/include: pmap.h
        src/sys/arch/x86/x86: pmap.c

Log Message:
Remove pmap_prealloc_lowmem_ptps on amd64. This function creates levels in
the page tree so that the first 2MB of virtual memory can be kentered in
L1.

Strictly speaking, the kernel should never kenter a virtual page below
VM_MIN_KERNEL_ADDRESS, because then it wouldn't be available in userland.
It used to need the first 2MB in order to map the CPU trampoline and the
initial VAs used by the bootstrap code. Now, the CPU trampoline VA is
allocated with uvm_km_alloc and the VAs used by the bootstrap code are
allocated with pmap_bootstrap_valloc, and in either case the resulting VA
is above VM_MIN_KERNEL_ADDRESS.

The low levels in the page tree are therefore unused. By removing this
function, we are making sure no one will be tempted to map an area below
VM_MIN_KERNEL_ADDRESS in kernel mode, and particularly, we are making sure
NULL cannot be kentered.

In short, there is no way to map NULL in kernel mode anymore.


To generate a diff of this commit:
cvs rdiff -u -r1.225 -r1.226 src/sys/arch/amd64/amd64/machdep.c
cvs rdiff -u -r1.37 -r1.38 src/sys/arch/amd64/include/pmap.h
cvs rdiff -u -r1.215 -r1.216 src/sys/arch/x86/x86/pmap.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.