Implement getcwd() in the core; Fix COM32 getcwd() to use the new function.

This resolves the previous comment about COM32 getcwd() not working by
not using INT 22h AX=001Fh.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Fix COM32 chdir() since it's implemented in the core.
Forgot the core changes needed for this before.

Signed-off-by: Gene Cumm <gene.cumm@gmail.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

As reported by hpa, strlcpy is safer and could prevent some bugs.
So I replaced all strncpy by strlcpy calls.

Make __farcall preserve the current value of IF.  If we need to we can
create a __raw_farcall() operation which does not.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

Unify multiple open-coded instances of integer binary logarithm.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

-Werror cleanup: remove unused variable.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

const char * confuse the *argv++ assignation
Casting to char * removes this warning

Do the actual idling in protected mode.  This both allows PM code a
more efficient interface, but also handles bugs in HVM implementations
which don't handle HLT in real mode.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

Resolved Conflicts:
	MCONFIG.embedded
	com32/MCONFIG
	com32/include/com32.h
	core/com32.inc
	core/pxelinux.asm
	doc/comboot.txt

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>