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| 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/common/load_elf.c | |
| 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/common/load_elf.c')
| -rw-r--r-- | sys/boot/common/load_elf.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sys/boot/common/load_elf.c b/sys/boot/common/load_elf.c index cd983a9..be8f881 100644 --- a/sys/boot/common/load_elf.c +++ b/sys/boot/common/load_elf.c @@ -263,7 +263,7 @@ __elfN(loadimage)(struct preloaded_file *fp, elf_file_t ef, u_int64_t off) #if __ELF_WORD_SIZE == 64 off = - (off & 0xffffffffff000000ull);/* x86_64 relocates after locore */ #else - off = - (off & 0xff000000u); /* i386 relocates after locore */ + off = - (off & 0xc0000000u); /* i386 relocates after locore */ #endif #else off = 0; /* other archs use direct mapped kernels */ |
