drivers/intel/fsp2_0: Add function to report FSP-T output

This allows to compare the FSP-T output in %ecx and %edx to coreboot's
CAR symbols:

Change-Id: I8d79f97f8c12c63ce215935353717855442a8290
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46884
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/src/drivers/intel/fsp2_0/fspt_report.c b/src/drivers/intel/fsp2_0/fspt_report.c
new file mode 100644
index 0000000000..7fa3205e3d
--- /dev/null
+++ b/src/drivers/intel/fsp2_0/fspt_report.c
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <arch/symbols.h>
+#include <console/console.h>
+#include <fsp/util.h>
+
+/* filled in assembly after FSP-T ran */
+uintptr_t temp_memory_start;
+uintptr_t temp_memory_end;
+
+void report_fspt_output(void)
+{
+	const struct region fsp_car_region = {
+		.offset = temp_memory_start,
+		.size = temp_memory_end - temp_memory_start,
+	};
+	const struct region coreboot_car_region = {
+		.offset = (uintptr_t)_car_region_start,
+		.size = (uintptr_t)_car_region_size,
+	};
+	printk(BIOS_DEBUG, "FSP-T: reported temp_mem region: [0x%08lx,0x%08lx)\n",
+	       temp_memory_start, temp_memory_end);
+	if (!region_is_subregion(&fsp_car_region, &coreboot_car_region)) {
+		printk(BIOS_ERR, "Wrong CAR region used!\n");
+		printk(BIOS_ERR, "Adapt CONFIG_DCACHE_RAM_BASE and CONFIG_DCACHE_RAM_SIZE to match FSP-T\n");
+	}
+}