1 files changed, 70 insertions, 0 deletions
diff --git a/common/load.c b/common/load.c
new file mode 100644
index 0000000..4669c0b
--- /dev/null
+++ b/common/load.c
@@ -0,0 +1,70 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * load.c - pull the payload into RAM. semihosting is the qemu path,
+ * flash and block devices follow the same shape once they exist.
+ *
+ * Copyright (C) 2026 Bradley Morgan <brads@mainlining.org>
+ */
+
+#include <string.h>
+#include <sys/types.h>
+#include <stdint.h>
+#include <semihosting.h>
+#include <boot.h>
+
+/*
+ * load fname into mem_base. the header decides the real placement, so
+ * we read the whole file first and let tb_image_setup place it.
+ */
+int tb_load_semihosting(const char *fname, uintptr_t load_addr,
+			uintptr_t mem_base, uint32 mem_size,
+			struct tb_image *img)
+{
+	struct Image_header *ih = (struct Image_header *)load_addr;
+	long fd;
+	long len;
+	long ret;
+
+	fd = smh_open(fname, MODE_READ | MODE_BINARY);
+	if (fd < 0)
+		return fd;
+
+	len = smh_flen(fd);
+	if (len < 0) {
+		smh_close(fd);
+		return len;
+	}
+
+	if ((uint32)len > mem_size) {
+		smh_close(fd);
+		return -2;
+	}
+
+	/* header first so placement is known before the big copy */
+	ret = smh_read(fd, (void *)load_addr, sizeof(*ih));
+	if (ret != sizeof(*ih)) {
+		smh_close(fd);
+		return -3;
+	}
+
+	if (tb_image_setup(load_addr, mem_base, mem_size, img)) {
+		smh_close(fd);
+		return -4;
+	}
+
+	if (img->load != load_addr) {
+		/* the image wants to sit elsewhere, copy it there */
+		memmove((void *)img->load, (void *)load_addr,
+			sizeof(*ih));
+	}
+
+	ret = smh_read(fd, (void *)(img->load + sizeof(*ih)),
+		       len - sizeof(*ih));
+	if (ret != len - sizeof(*ih)) {
+		smh_close(fd);
+		return -5;
+	}
+
+	smh_close(fd);
+	return 0;
+}