sys: add userspace bootstrap program

sys/bootstrap/tar.h

@@ -0,0 +1,45 @@
+#ifndef TAR_H_
+#define TAR_H_
+
+#include <mango/types.h>
+#include <stddef.h>
+#include <stdint.h>
+
+struct tar {
+	struct tar_bin_header *tar_entries;
+};
+
+struct tar_bin_header {
+	char filename[100];
+	char mode[8];
+	char uid[8];
+	char gid[8];
+	char size[12];
+	char mtime[12];
+	char chksum[8];
+	char typeflag[1];
+} __attribute__((aligned(512)));
+
+struct tar_header {
+	char filename[100];
+	size_t size;
+};
+
+struct tar_file {
+	struct tar_header f_header;
+	const void *f_data;
+};
+
+extern int tar_init(struct tar *tar, uintptr_t base);
+
+extern int tar_open(struct tar *tar, const char *path, struct tar_file *out);
+
+extern int tar_file_create_vm_object(
+	const struct tar_file *file,
+	kern_handle_t *out);
+
+extern int tar_header_decode(
+	const struct tar_bin_header *in,
+	struct tar_header *out);
+
+#endif