Add Google ChromeOS vendor support

Google's ChromeOS can be booted super fast and safely
using coreboot. This adds the ChromeOS specific code that
is required by all ChromeBooks to do this.

Change-Id: Ic03ff090a569a27acbd798ce1e5f89a34897a2f2
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/817
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

1 files changed, 49 insertions, 14 deletions

diff --git a/src/vendorcode/google/chromeos/vboot.c b/src/vendorcode/google/chromeos/vboot.c
index e0a8c9b336..5bdb7a2b7a 100644
--- a/src/vendorcode/google/chromeos/vboot.c
+++ b/src/vendorcode/google/chromeos/vboot.c
@@ -21,9 +21,11 @@
 #include <console/console.h>
 #include <arch/acpi.h>
 #include <pc80/tpm.h>
+#include <reset.h>
 #include "chromeos.h"
 
 //#define EXTRA_LOGGING
+#define UBOOT_DOES_TPM_STARTUP
 
 #define TPM_LARGE_ENOUGH_COMMAND_SIZE 256	/* saves space in the firmware */
 
@@ -44,6 +46,12 @@ static const struct {
 };
 
 static const struct {
+	u8 buffer[12];
+} tpm_startup_cmd = {
+	{0x0, 0xc1, 0x0, 0x0, 0x0, 0xc, 0x0, 0x0, 0x0, 0x99, 0x0, 0x1 }
+};
+
+static const struct {
 	u8 buffer[10];
 } tpm_continueselftest_cmd = {
 	{ 0x0, 0xc1, 0x0, 0x0, 0x0, 0xa, 0x0, 0x0, 0x0, 0x53 }
@@ -169,33 +177,60 @@ static u32 TlclSendReceive(const u8 * request, u8 * response, int max_length)
 	return result;
 }
 
-void init_vboot(void)
+static void init_vboot(int bootmode)
 {
 	u32 result;
 	u8 response[TPM_LARGE_ENOUGH_COMMAND_SIZE];
 
-	printk(BIOS_DEBUG, "TPM: Init\n");
+#ifdef UBOOT_DOES_TPM_STARTUP
+	/* Doing TPM startup when we're not coming in on the S3 resume path
+	 * saves us roughly 20ms in boot time only. This does not seem to
+	 * be worth an API change to vboot_reference-firmware right now, so
+	 * let's keep the code around, but just bail out early:
+	 */
+	if (bootmode != 2)
+		return;
+#endif
+
+	printk(BIOS_DEBUG, "Verified boot TPM initialization.\n");
+
+	printk(BIOS_SPEW, "TPM: Init\n");
 	if (tis_init())
 		return;
 
-	printk(BIOS_DEBUG, "TPM: Open\n");
+	printk(BIOS_SPEW, "TPM: Open\n");
 	if (tis_open())
 		return;
 
-	printk(BIOS_DEBUG, "TPM: Resume\n");
 
-	result =
-	    TlclSendReceive(tpm_resume_cmd.buffer, response, sizeof(response));
-
-	if (result == TPM_E_INVALID_POSTINIT) {
-		/* We're on a platform where the TPM maintains power in S3, so
-		 * it's already initialized. */
-		printk(BIOS_DEBUG, "TPM: Already initialized.\n");
-		return;
+	if (bootmode == 2) {
+		/* S3 Resume */
+		printk(BIOS_SPEW, "TPM: Resume\n");
+		result = TlclSendReceive(tpm_resume_cmd.buffer,
+					response, sizeof(response));
+		if (result == TPM_E_INVALID_POSTINIT) {
+			/* We're on a platform where the TPM maintains power
+			 * in S3, so it's already initialized.
+			 */
+			printk(BIOS_DEBUG, "TPM: Already initialized.\n");
+			return;
+		}
+	} else {
+		printk(BIOS_SPEW, "TPM: Startup\n");
+		result = TlclSendReceive(tpm_startup_cmd.buffer,
+					response, sizeof(response));
 	}
+
 	if (result == TPM_SUCCESS) {
-		printk(BIOS_DEBUG, "TPM: OK.\n");
+		printk(BIOS_SPEW, "TPM: OK.\n");
 		return;
 	}
-	// TODO(reinauer) hard reboot?
+
+	printk(BIOS_ERR, "TPM: Error code 0x%x. Hard reset!\n", result);
+	hard_reset();
+}
+
+void init_chromeos(int bootmode)
+{
+	init_vboot(bootmode);
 }