diff options
| author | ru <ru@FreeBSD.org> | 2006-10-29 14:50:58 +0000 |
|---|---|---|
| committer | ru <ru@FreeBSD.org> | 2006-10-29 14:50:58 +0000 |
| commit | f0e19d90c0fc3bf47cab297e03cd0fc782076767 (patch) | |
| tree | 8b907f11b53d6e4725c11716fdf425629834fc0a /sys/boot/pc98/boot2 | |
| 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/boot/pc98/boot2')
| -rw-r--r-- | sys/boot/pc98/boot2/boot.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sys/boot/pc98/boot2/boot.c b/sys/boot/pc98/boot2/boot.c index feccc7e..96dfb72 100644 --- a/sys/boot/pc98/boot2/boot.c +++ b/sys/boot/pc98/boot2/boot.c @@ -199,9 +199,9 @@ loadprog(void) /* * We assume that the entry address is the same as the lowest text * address and that the kernel startup code handles relocation by - * this address rounded down to a multiple of 16M. + * this address rounded down to a multiple of 1G. */ - startaddr = head.a_entry & 0x00FFFFFF; + startaddr = head.a_entry & 0x3FFFFFFF; addr = startaddr; printf("Booting %d:%s(%d,%c)%s @ 0x%x\n" , dosdev & 0x0f |
