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author | ru <ru@FreeBSD.org> | 2006-10-29 14:50:58 +0000 |
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committer | ru <ru@FreeBSD.org> | 2006-10-29 14:50:58 +0000 |
commit | f0e19d90c0fc3bf47cab297e03cd0fc782076767 (patch) | |
tree | 8b907f11b53d6e4725c11716fdf425629834fc0a /sys/modules | |
parent | 248a5cec67d92bfe2d6ecfe22e5e82d80fbbbdc6 (diff) | |
download | FreeBSD-src-f0e19d90c0fc3bf47cab297e03cd0fc782076767.zip FreeBSD-src-f0e19d90c0fc3bf47cab297e03cd0fc782076767.tar.gz |
Because the BTX mini-kernel now uses flat memory mode and clients
are no longer limited to a virtual address space of 16 megabytes,
only mask high two bits of a virtual address. This allows to load
larger kernels (up to 1 gigabyte). Not masking addresses at all
was a bad idea on machines with less than >3G of memory -- kernels
are linked at 0xc0xxxxxx, and that would attempt to load a kernel
at above 3G. By masking only two highest bits we stay within the
safe limits while still allowing to boot larger kernels.
(This is a safer reimplmentation of sys/boot/i386/boot2/boot.2.c
rev. 1.71.)
Prodded by: jhb
Tested by: nyan (pc98)
Diffstat (limited to 'sys/modules')
0 files changed, 0 insertions, 0 deletions