WinPE's pxeboot.n12 takes the BufferLimit returned by gPXE (indicating
the size of gPXE's internal DHCP packet buffers) and erroneously passes
it in as BufferSize (indicating the size of pxeboot.n12's DHCP packet
buffer).  If these don't match, then pxeboot.n12 ends up instructing gPXE
to overwrite parts of its data segment.

Change gPXE's internal DHCP packet buffers to be exactly
sizeof(BOOTPLAYER_t) bytes to work around this problem.

This allows pxelinux to execute arbitrary gPXE commands.  This is
remarkably unsafe (not least because some of the commands will assume
full ownership of memory and do nasty things like edit the e820 map
underneath the calling pxelinux), but it does allow access to the
"sanboot" command.

stored DHCP packets.

separate xfer method.

Add missing .alloc_iob entries to several xfer_interface_operations
structures.

PXENV_GET_CACHED_INFO.  NTLDR does this.

PXENV_GET_CACHED_INFO.  If we dont do this, Altiris' NBP screws up; it
relies on being able to grab pointers to each of the three packets and
then read them at will later.

s_PXENV_GET_CACHED_INFO, because this field doesn't exist in earlier
versions of the PXE spec, and some callers don't allocate space for it.

xfer_window() function, which can return a scalar rather than a
boolean.

safe dropping of the netdev ref by the driver while other refs still
exist.

Add netdev_irq() method.  Net device open()/close() methods should no
longer enable or disable IRQs.

Remove rx_quota; it wasn't used anywhere and added too much complexity
to implementing correct interrupt-masking behaviour in pxe_undi.c.

now-obsolete pxe.c.

5.4 bugs when driving ourselves via UNDI.

suspect that we need it, and implementing it would require needlessly
complicating the net device API.

handed a P_UNKNOWN packet.

Correct typo in pxenv_set_station_address().

via UNDI API and also by ifstat command; may be useful for debugging.

by PXE and NBI) and UNDI packets (as used by undinet and UNDI).

Use generic fields in struct device_description rather than assuming
that the struct device * is contained within a pci_device or
isapnp_device; this assumption is broken when using the undionly
driver.

Add PXENV_UNDI_SET_STATION_ADDRESS.

correct, but it's enough to get RIS working.

Implement PXENV_RESTART_TFTP.

present; DHCP is broken).

UDP API.

return a static buffer.

but there's so much else missing that it's not worth doing right now.

defined in vsprintf.h.  (This may change, since vsprintf.h is a
non-standard name, but for now it's the one to use.)

There should be no need to include vsprintf.h just for DBG() statements,
since include/compiler.h forces it in for a debug build anyway.