From cd50715e0334fb16006788506e3815e489d337a9 Mon Sep 17 00:00:00 2001
From: Felix Held <felix-coreboot@felixheld.de>
Date: Tue, 24 Nov 2020 20:37:15 +0100
Subject: soc/amd: move vboot-on-PSP-related functions to common/vboot

Change-Id: I4f07d3ab12116229a13d2e8c02b2deb06e51a1af
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47976
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
---
 src/soc/amd/common/vboot/vboot_bootblock.c | 50 ++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

(limited to 'src/soc/amd/common')

diff --git a/src/soc/amd/common/vboot/vboot_bootblock.c b/src/soc/amd/common/vboot/vboot_bootblock.c
index 3fbc4ef608..45ad9de03e 100644
--- a/src/soc/amd/common/vboot/vboot_bootblock.c
+++ b/src/soc/amd/common/vboot/vboot_bootblock.c
@@ -2,13 +2,23 @@
 
 #include <amdblocks/reset.h>
 #include <bl_uapp/bl_syscall_public.h>
+#include <bootblock_common.h>
 #include <console/console.h>
 #include <pc80/mc146818rtc.h>
 #include <security/vboot/vbnv.h>
 #include <security/vboot/symbols.h>
 #include <soc/psp_transfer.h>
+#include <timestamp.h>
 #include <2struct.h>
 
+static int transfer_buffer_valid(const struct transfer_info_struct *ptr)
+{
+	if (ptr->magic_val == TRANSFER_MAGIC_VAL)
+		return 1;
+	else
+		return 0;
+}
+
 void verify_psp_transfer_buf(void)
 {
 	if (*(uint32_t *)_vboot2_work == VB2_SHARED_DATA_MAGIC) {
@@ -51,3 +61,43 @@ void show_psp_transfer_info(void)
 				"Production" : "Pre-Production");
 	}
 }
+
+void boot_with_psp_timestamp(uint64_t base_timestamp)
+{
+	const struct transfer_info_struct *info = (const struct transfer_info_struct *)
+		(void *)(uintptr_t)_transfer_buffer;
+
+	if (!transfer_buffer_valid(info) || info->timestamp == 0)
+		return;
+
+	/*
+	 * info->timestamp is PSP's timestamp (in microseconds)
+	 * when x86 processor is released.
+	 */
+	uint64_t psp_last_ts = info->timestamp;
+
+	int i;
+	struct timestamp_table *psp_ts_table =
+		(struct timestamp_table *)(void *)
+		((uintptr_t)_transfer_buffer + info->timestamp_offset);
+	/* new base_timestamp will be offset for all PSP timestamps. */
+	base_timestamp -= psp_last_ts;
+
+	for (i = 0; i < psp_ts_table->num_entries; i++) {
+		struct timestamp_entry *tse = &psp_ts_table->entries[i];
+		/*
+		 * We ignore the time between x86 processor release and bootblock.
+		 * Since timestamp_add subtracts base_time, we first add old base_time
+		 * to make it absolute then add base_timestamp again since
+		 * it'll be a new base_time.
+		 *
+		 * We don't need to convert unit since both PSP and coreboot
+		 * will use 1us granularity.
+		 *
+		 */
+		tse->entry_stamp += psp_ts_table->base_time + base_timestamp;
+	}
+
+	bootblock_main_with_timestamp(base_timestamp, psp_ts_table->entries,
+				      psp_ts_table->num_entries);
+}
-- 
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