Add build option for the ia32 loader

In preparation for supporting 64-bit machines with 32-bit UEFI firmware,
add a build option for compiling the ia32 loader. Currently unused.

Reviewed by: imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/1098

share/mk/src.opts.mk

@@ -132,6 +132,7 @@ __DEFAULT_YES_OPTIONS = \
     LOADER_OFW \
     LOADER_PXEBOOT \
     LOADER_UBOOT \
+    LOADER_IA32 \
     LOCALES \
     LOCATE \
     LPR \
@@ -330,6 +331,10 @@ BROKEN_OPTIONS+=LOADER_KBOOT
 .if (${__T:Marm*} == "" && ${__T:Mpowerpc*} == "") || ${__T} == "powerpc64le"
 BROKEN_OPTIONS+=LOADER_UBOOT
 .endif
+# The 32-bit UEFI loader is only for amd64
+.if ${__T} != "amd64"
+BROKEN_OPTIONS+=LOADER_IA32
+.endif
 # GELI and Lua in loader currently cause boot failures on powerpc.
 # Further debugging is required -- probably they are just broken on big
 # endian systems generically (they jump to null pointers or try to read

tools/build/options/WITHOUT_LOADER_IA32

@@ -0,0 +1 @@
+Do not build the 32-bit UEFI loader.

tools/build/options/WITH_LOADER_IA32

@@ -0,0 +1 @@
+Build the 32-bit UEFI loader.