spl: test: Add a test for spl_load_simple_fit()

As an example of an SPL test, add a new test for loading a FIT within
SPL. This runs on sandbox_spl. For this to work, the text base is adjusted
so that there is plenty of space available.

While we are here, document struct spl_load_info properly, since this is
currently ambiguous.

This test only verifies the logic path. It does not actually check that
the image is loaded correctly. It is not possible for sandbox's SPL to
actually run u-boot.img since it currently includes u-boot.bin rather than
u-boot. Further work could expand the test in that direction.

The need for this was noted at:

   http://patchwork.ozlabs.org/project/uboot/patch/20201216000944.2832585-3-mr.nuke.me@gmail.com/

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 91 insertions, 0 deletions

diff --git a/test/image/spl_load.c b/test/image/spl_load.c
new file mode 100644
index 00000000000..851603ddd75
--- /dev/null
+++ b/test/image/spl_load.c
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2021 Google LLC
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#include <common.h>
+#include <image.h>
+#include <mapmem.h>
+#include <os.h>
+#include <spl.h>
+#include <test/ut.h>
+
+/* Declare a new SPL test */
+#define SPL_TEST(_name, _flags)		UNIT_TEST(_name, _flags, spl_test)
+
+/* Context used for this test */
+struct text_ctx {
+	int fd;
+};
+
+static ulong read_fit_image(struct spl_load_info *load, ulong sector,
+			    ulong count, void *buf)
+{
+	struct text_ctx *text_ctx = load->priv;
+	off_t offset, ret;
+	ssize_t res;
+
+	offset = sector * load->bl_len;
+	ret = os_lseek(text_ctx->fd, offset, OS_SEEK_SET);
+	if (ret != offset) {
+		printf("Failed to seek to %zx, got %zx (errno=%d)\n", offset,
+		       ret, errno);
+		return 0;
+	}
+
+	res = os_read(text_ctx->fd, buf, count * load->bl_len);
+	if (res == -1) {
+		printf("Failed to read %lx bytes, got %ld (errno=%d)\n",
+		       count * load->bl_len, res, errno);
+		return 0;
+	}
+
+	return count;
+}
+
+int board_fit_config_name_match(const char *name)
+{
+	return 0;
+}
+
+struct image_header *spl_get_load_buffer(ssize_t offset, size_t size)
+{
+	return map_sysmem(0x100000, 0);
+}
+
+static int spl_test_load(struct unit_test_state *uts)
+{
+	struct spl_image_info image;
+	struct image_header *header;
+	struct text_ctx text_ctx;
+	struct spl_load_info load;
+	char fname[256];
+	int ret;
+	int fd;
+
+	memset(&load, '\0', sizeof(load));
+	load.bl_len = 512;
+	load.read = read_fit_image;
+
+	ret = os_find_u_boot(fname, sizeof(fname), true);
+	if (ret) {
+		printf("(%s not found, error %d)\n", fname, ret);
+		return ret;
+	}
+	load.filename = fname;
+
+	header = spl_get_load_buffer(-sizeof(*header), sizeof(*header));
+
+	fd = os_open(fname, OS_O_RDONLY);
+	ut_assert(fd >= 0);
+	ut_asserteq(512, os_read(fd, header, 512));
+	text_ctx.fd = fd;
+
+	load.priv = &text_ctx;
+
+	ut_assertok(spl_load_simple_fit(&image, &load, 0, header));
+
+	return 0;
+}
+SPL_TEST(spl_test_load, 0);