cvs commit: src/sys/boot/common load_elf.c src/sys/boot/i386/boot2 boot2.c src/sys/boot/i386/libi386 elf32_freebsd.c src/sys/boot/pc98/boot2 boot.c

John Baldwin jhb at
Mon Oct 30 18:03:44 UTC 2006

On Sunday 29 October 2006 09:50, Ruslan Ermilov wrote:
> ru          2006-10-29 14:50:58 UTC
>   FreeBSD src repository
>   Modified files:
>     sys/boot/common      load_elf.c 
>     sys/boot/i386/boot2  boot2.c 
>     sys/boot/i386/libi386 elf32_freebsd.c 
>     sys/boot/pc98/boot2  boot.c 
>   Log:
>   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)


John Baldwin

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