kboot: Move seg code into libkboot

This code is really generic segment processing and should live here. It
also interfaces primarily with Linux APIs, so it's also appropriate for
this if we have a version of that runs as a FreeBSD binary using FreeBSD
system calls and APIs, though that's in the future somehow...

Sponsored by:		Netflix

stand/kboot/include/seg.h

@@ -0,0 +1,24 @@
+/*-
+ * Copyright (c) 2024, Netflix, Inc.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+struct memory_segments
+{
+	uint64_t	start;
+	uint64_t	end;
+	uint64_t	type;	/* MD defined */
+};
+
+#define SYSTEM_RAM 1
+void init_avail(void);
+void need_avail(int n);
+void add_avail(uint64_t start, uint64_t end, uint64_t type);
+void remove_avail(uint64_t start, uint64_t end, uint64_t type);
+uint64_t first_avail(uint64_t align, uint64_t min_size, uint64_t type);
+void print_avail(void);
+bool populate_avail_from_iomem(void);
+uint64_t space_avail(uint64_t start);

stand/kboot/kboot/Makefile

@@ -25,7 +25,6 @@ SRCS=	\
 		hostfs.c \
 		init.c \
 		main.c \
-		seg.c \
 		util.c \
 		vers.c
 

stand/kboot/kboot/kboot.h

@@ -9,13 +9,6 @@
 
 #define DEVT_HOSTDISK 1234
 
-struct memory_segments
-{
-	uint64_t	start;
-	uint64_t	end;
-	uint64_t	type;	/* MD defined */
-};
-
 bool enumerate_memory_arch(void);
 struct preloaded_file;
 void bi_loadsmap(struct preloaded_file *kfp);
@@ -40,19 +33,10 @@ const char *hostdisk_gen_probe(void);
 void hostdisk_zfs_probe(void);
 bool hostdisk_zfs_find_default(void);
 
-/* seg.c */
-#define SYSTEM_RAM 1
-void init_avail(void);
-void need_avail(int n);
-void add_avail(uint64_t start, uint64_t end, uint64_t type);
-void remove_avail(uint64_t start, uint64_t end, uint64_t type);
-uint64_t first_avail(uint64_t align, uint64_t min_size, uint64_t type);
-void print_avail(void);
-bool populate_avail_from_iomem(void);
-uint64_t space_avail(uint64_t start);
-
 /* util.c */
 bool file2str(const char *fn, char *buffer, size_t buflen);
 bool file2u64(const char *fn, uint64_t *val);
 
+#include "seg.h"
+
 #endif /* KBOOT_H */

stand/kboot/libkboot/Makefile

@@ -9,6 +9,7 @@ CFLAGS+=-I${.CURDIR} -I${.CURDIR}/arch/${MACHINE_ARCH}
 SRCS=	crt1.c
 SRCS+=	host_syscall.S
 SRCS+=	host_syscalls.c
+SRCS+=	seg.c
 SRCS+=	termios.c
 
 .sinclude "${.CURDIR}/arch/${MACHINE_ARCH}/Makefile.inc"

stand/kboot/libkboot/seg.c

@@ -5,7 +5,7 @@
  */
 
 #include "stand.h"
-#include "kboot.h"
+#include "seg.h"
 
 #include <sys/param.h>