kboot: Add our own lua bindings

Create a small wrapper around the new flua hash module so we can use it
here too. There's no 4th bindings, nor will they be created.

Sponsored by:		Netflix
Differential Revision:	https://reviews.freebsd.org/D43874

stand/defs.mk

@@ -62,6 +62,7 @@ BINDIR?=	/boot
 # LUAPATH is where we search for and install lua scripts.
 LUAPATH?=	/boot/lua
 FLUASRC?=	${SRCTOP}/libexec/flua
+FLUALIB?=	${SRCTOP}/lib/flua
 
 LIBSA=		${BOOTOBJ}/libsa/libsa.a
 .if ${MACHINE} == "i386"

stand/i386/loader/Makefile

@@ -33,7 +33,7 @@ VERSION_FILE=	${.CURDIR}/../loader/version
 #
 # will tell you how many kiB of lomem are available.
 #
-LOADERSIZE?=	550000		# Largest known safe size for loader.bin
+LOADERSIZE?=	570000		# Largest known safe size for loader.bin
 
 .PATH:		${BOOTSRC}/i386/loader
 

stand/kboot/kboot/Makefile

@@ -60,4 +60,11 @@ CFLAGS+=	-Wall
 DPADD=		${LDR_INTERP} ${LIBOFW} ${LIBSAFDT} ${LIBSA} ${LIBKBOOT}
 LDADD=		${LDR_INTERP} ${LIBOFW} ${LIBSAFDT} ${LIBSA} ${LIBKBOOT}
 
+# Add our own lua bindings until they are universal
+.if ${LOADER_INTERP} == "lua"
+SRCS+=		\
+		lua_bindings.c
+CFLAGS.lua_bindings.c+=  -I${FLUALIB}/libhash
+.endif
+
 .include <bsd.prog.mk>

stand/kboot/kboot/lua_bindings.c

@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2024 Netflix, Inc.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "lua.h"
+#include "lauxlib.h"
+#include "lutils.h"
+#include "lhash.h"
+
+static void
+lua_hash_bindings(lua_State *L)
+{
+	luaL_requiref(L, "hash", luaopen_hash, 1);
+	lua_pop(L, 1);	/* Remove lib */
+}
+
+LUA_COMPILE_SET(lua_hash_bindings);

stand/liblua/Makefile

@@ -27,6 +27,8 @@ SRCS+=	gfx_utils.c
 
 .PATH:	${FLUASRC}/modules
 SRCS+=	lfs.c
+.PATH:	${FLUALIB}/libhash
+SRCS+=	lhash.c
 
 WARNS?=	3
 
@@ -36,6 +38,7 @@ CFLAGS+= -fno-stack-protector -D__BSD_VISIBLE
 CFLAGS+= -I${BOOTSRC}/include -I${LIBLUASRC} -I${LUASRC} -I${LDRSRC}
 
 CFLAGS.gfx_utils.c+= -I${SRCTOP}/sys/teken -I${SRCTOP}/contrib/pnglite
+CFLAGS.lhash.c+= -I${FLUALIB}/libhash -I${SRCTOP}/sys/crypto/sha2
 
 .if ${MACHINE_CPUARCH} == "amd64" && ${DO32:U0} == 0
 CFLAGS+=	-fPIC