1 files changed, 148 insertions, 0 deletions
diff --git a/src/soc/intel/braswell/refcode.c b/src/soc/intel/braswell/refcode.c
new file mode 100644
index 0000000000..558db3cc8d
--- /dev/null
+++ b/src/soc/intel/braswell/refcode.c
@@ -0,0 +1,148 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <string.h>
+#include <arch/acpi.h>
+#include <cbmem.h>
+#include <console/console.h>
+#include <console/streams.h>
+#include <cpu/x86/tsc.h>
+#include <program_loading.h>
+#include <rmodule.h>
+#include <stage_cache.h>
+#if IS_ENABLED(CONFIG_CHROMEOS)
+#include <vendorcode/google/chromeos/vboot_handoff.h>
+#endif
+
+#include <soc/ramstage.h>
+#include <soc/efi_wrapper.h>
+
+static void ABI_X86 send_to_console(unsigned char b)
+{
+	console_tx_byte(b);
+}
+
+static efi_wrapper_entry_t load_refcode_from_cache(void)
+{
+	struct prog refcode;
+
+	printk(BIOS_DEBUG, "refcode loading from cache.\n");
+
+	stage_cache_load_stage(STAGE_REFCODE, &refcode);
+
+	return (efi_wrapper_entry_t)prog_entry(&refcode);
+}
+
+static void cache_refcode(const struct rmod_stage_load *rsl)
+{
+	stage_cache_add(STAGE_REFCODE, rsl->prog);
+}
+
+#if IS_ENABLED(CONFIG_CHROMEOS)
+static int load_refcode_from_vboot(struct rmod_stage_load *refcode)
+{
+	struct vboot_handoff *vboot_handoff;
+	const struct firmware_component *fwc;
+	struct cbfs_stage *stage;
+
+	vboot_handoff = cbmem_find(CBMEM_ID_VBOOT_HANDOFF);
+	fwc = &vboot_handoff->components[CONFIG_VBOOT_REFCODE_INDEX];
+
+	if (vboot_handoff == NULL ||
+	    vboot_handoff->selected_firmware == VB_SELECT_FIRMWARE_READONLY ||
+	    CONFIG_VBOOT_REFCODE_INDEX >= MAX_PARSED_FW_COMPONENTS ||
+	    fwc->size == 0 || fwc->address == 0)
+		return -1;
+
+	printk(BIOS_DEBUG, "refcode loading from vboot rw area.\n");
+	stage = (void *)(uintptr_t)fwc->address;
+
+	if (rmodule_stage_load(refcode, stage)) {
+		printk(BIOS_DEBUG, "Error loading reference code.\n");
+		return -1;
+	}
+	return 0;
+}
+#else
+static int load_refcode_from_vboot(struct rmod_stage_load *refcode)
+{
+	return -1;
+}
+#endif
+
+static int load_refcode_from_cbfs(struct rmod_stage_load *refcode)
+{
+	printk(BIOS_DEBUG, "refcode loading from cbfs.\n");
+
+	if (rmodule_stage_load_from_cbfs(refcode)) {
+		printk(BIOS_DEBUG, "Error loading reference code.\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+static efi_wrapper_entry_t load_reference_code(void)
+{
+	struct prog prog = {
+		.name = CONFIG_CBFS_PREFIX "/refcode",
+	};
+	struct rmod_stage_load refcode = {
+		.cbmem_id = CBMEM_ID_REFCODE,
+		.prog = &prog,
+	};
+
+	if (acpi_is_wakeup_s3()) {
+		return load_refcode_from_cache();
+	}
+
+	if (load_refcode_from_vboot(&refcode) ||
+		load_refcode_from_cbfs(&refcode))
+			return NULL;
+
+	/* Cache loaded reference code. */
+	cache_refcode(&refcode);
+
+	return prog_entry(&prog);
+}
+
+void baytrail_run_reference_code(void)
+{
+	int ret;
+	efi_wrapper_entry_t entry;
+	struct efi_wrapper_params wrp = {
+		.version = EFI_WRAPPER_VER,
+		.console_out = send_to_console,
+	};
+
+	entry = load_reference_code();
+
+	if (entry == NULL)
+		return;
+
+	wrp.tsc_ticks_per_microsecond = tsc_freq_mhz();
+
+	/* Call into reference code. */
+	ret = entry(&wrp);
+
+	if (ret != 0) {
+		printk(BIOS_DEBUG, "Reference code returned %d\n", ret);
+		return;
+	}
+}