cvs commit: src/sys/i386/i386 locore.s

[Bruce Evans]

bde         2003/07/29 14:57:01 PDT

  FreeBSD src repository

  Modified files:
    sys/i386/i386        locore.s 
  Log:
  Restored clearing of the bss, except for putting it in a correct place
  with up to date comments.  This fixes booting kernels with boot2
  (except for loss of the features provided by loader) and is suitable
  for MFC.  Contrary to the old comments, most loaders don't clear the bss.
  biosboot lost clearing of the bss in a code crunch in 1997, and boot2
  never did it.
  
  kan didn't notice the problem with gcc-3.3 putting variables that are
  initialized to 0 in the bss until after committing gcc-3.3 because he
  was already using essentially this patch.  Before gcc-3.3, only the
  non-critical `bootdev' variable was clobbered by clearing the bss.
  
  MFC after:      3 days
  
  Revision  Changes    Path
  1.174     +18 -9     src/sys/i386/i386/locore.s