security/tpm: Drop CAR_GLOBAL_MIGRATION support

Change-Id: I1c09eda6164efb390de4626f52aafba59962f9c4
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37029
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

2 files changed, 24 insertions, 30 deletions

diff --git a/src/security/tpm/tss/tcg-2.0/tss.c b/src/security/tpm/tss/tcg-2.0/tss.c
index 16e40fe569..6bc30966ff 100644
--- a/src/security/tpm/tss/tcg-2.0/tss.c
+++ b/src/security/tpm/tss/tcg-2.0/tss.c
@@ -5,7 +5,6 @@
  * found in the LICENSE file.
  */
 
-#include <arch/early_variables.h>
 #include <console/console.h>
 #include <endian.h>
 #include <string.h>
@@ -30,11 +29,9 @@ void *tpm_process_command(TPM_CC command, void *command_body)
 	size_t in_size;
 	const uint8_t *sendb;
 	/* Command/response buffer. */
-	static uint8_t cr_buffer[TPM_BUFFER_SIZE] CAR_GLOBAL;
+	static uint8_t cr_buffer[TPM_BUFFER_SIZE];
 
-	uint8_t *cr_buffer_ptr = car_get_var_ptr(cr_buffer);
-
-	obuf_init(&ob, cr_buffer_ptr, sizeof(cr_buffer));
+	obuf_init(&ob, cr_buffer, sizeof(cr_buffer));
 
 	if (tpm_marshal_command(command, command_body, &ob) < 0) {
 		printk(BIOS_ERR, "command %#x\n", command);
@@ -44,12 +41,12 @@ void *tpm_process_command(TPM_CC command, void *command_body)
 	sendb = obuf_contents(&ob, &out_size);
 
 	in_size = sizeof(cr_buffer);
-	if (tis_sendrecv(sendb, out_size, cr_buffer_ptr, &in_size)) {
+	if (tis_sendrecv(sendb, out_size, cr_buffer, &in_size)) {
 		printk(BIOS_ERR, "tpm transaction failed\n");
 		return NULL;
 	}
 
-	ibuf_init(&ib, cr_buffer_ptr, in_size);
+	ibuf_init(&ib, cr_buffer, in_size);
 
 	return tpm_unmarshal_response(command, &ib);
 }
@@ -173,13 +170,12 @@ uint32_t tlcl_force_clear(void)
 	return TPM_SUCCESS;
 }
 
-static uint8_t tlcl_init_done CAR_GLOBAL;
+static uint8_t tlcl_init_done;
 
 /* This function is called directly by vboot, uses vboot return types. */
 uint32_t tlcl_lib_init(void)
 {
-	uint8_t done = car_get_var(tlcl_init_done);
-	if (done)
+	if (tlcl_init_done)
 		return VB2_SUCCESS;
 
 	if (tis_init()) {
@@ -192,7 +188,7 @@ uint32_t tlcl_lib_init(void)
 		return VB2_ERROR_UNKNOWN;
 	}
 
-	car_set_var(tlcl_init_done, 1);
+	tlcl_init_done = 1;
 
 	return VB2_SUCCESS;
 }
diff --git a/src/security/tpm/tss/tcg-2.0/tss_marshaling.c b/src/security/tpm/tss/tcg-2.0/tss_marshaling.c
index 1bf211a898..720e7c4b68 100644
--- a/src/security/tpm/tss/tcg-2.0/tss_marshaling.c
+++ b/src/security/tpm/tss/tcg-2.0/tss_marshaling.c
@@ -5,7 +5,6 @@
  * found in the LICENSE file.
  */
 
-#include <arch/early_variables.h>
 #include <commonlib/iobuf.h>
 #include <console/console.h>
 #include <stdlib.h>
@@ -15,7 +14,7 @@
 #include <security/tpm/tss/vendor/cr50/cr50.h>
 #include <security/tpm/tss.h>
 
-static uint16_t tpm_tag CAR_GLOBAL;  /* Depends on the command type. */
+static uint16_t tpm_tag;  /* Depends on the command type. */
 
 #define unmarshal_TPM_CAP(a, b) ibuf_read_be32(a, b)
 #define unmarshal_TPM_CC(a, b) ibuf_read_be32(a, b)
@@ -165,7 +164,7 @@ static int marshal_common_session_header(struct obuf *ob,
 	struct tpm2_session_header session_header;
 	int rc = 0;
 
-	car_set_var(tpm_tag, TPM_ST_SESSIONS);
+	tpm_tag = TPM_ST_SESSIONS;
 
 	for (i = 0; i < handle_count; i++)
 		rc |= marshal_TPM_HANDLE(ob, handles[i]);
@@ -270,7 +269,7 @@ static int marshal_hierarchy_control(struct obuf *ob,
 	int rc = 0;
 	struct tpm2_session_header session_header;
 
-	car_set_var(tpm_tag, TPM_ST_SESSIONS);
+	tpm_tag = TPM_ST_SESSIONS;
 
 	rc |= marshal_TPM_HANDLE(ob, TPM_RH_PLATFORM);
 	memset(&session_header, 0, sizeof(session_header));
@@ -335,7 +334,7 @@ int tpm_marshal_command(TPM_CC command, void *tpm_command_body, struct obuf *ob)
 	const size_t hdr_sz = sizeof(uint16_t) + 2 * sizeof(uint32_t);
 	int rc = 0;
 
-	car_set_var(tpm_tag, TPM_ST_NO_SESSIONS);
+	tpm_tag = TPM_ST_NO_SESSIONS;
 
 	if (obuf_splice_current(ob, &ob_hdr, hdr_sz) < 0)
 		return -1;
@@ -407,7 +406,7 @@ int tpm_marshal_command(TPM_CC command, void *tpm_command_body, struct obuf *ob)
 		return rc;
 
 	/* Fix up the command header with known values. */
-	rc |= obuf_write_be16(&ob_hdr, car_get_var(tpm_tag));
+	rc |= obuf_write_be16(&ob_hdr, tpm_tag);
 	rc |= obuf_write_be32(&ob_hdr, obuf_nr_written(ob));
 
 	return rc;
@@ -552,23 +551,22 @@ static int unmarshal_vendor_command(struct ibuf *ib,
 
 struct tpm2_response *tpm_unmarshal_response(TPM_CC command, struct ibuf *ib)
 {
-	static struct tpm2_response tpm2_static_resp CAR_GLOBAL;
-	struct tpm2_response *tpm2_resp = car_get_var_ptr(&tpm2_static_resp);
+	static struct tpm2_response tpm2_static_resp;
 	int rc = 0;
 
-	rc |= ibuf_read_be16(ib, &tpm2_resp->hdr.tpm_tag);
-	rc |= ibuf_read_be32(ib, &tpm2_resp->hdr.tpm_size);
-	rc |= unmarshal_TPM_CC(ib, &tpm2_resp->hdr.tpm_code);
+	rc |= ibuf_read_be16(ib, &tpm2_static_resp.hdr.tpm_tag);
+	rc |= ibuf_read_be32(ib, &tpm2_static_resp.hdr.tpm_size);
+	rc |= unmarshal_TPM_CC(ib, &tpm2_static_resp.hdr.tpm_code);
 
 	if (rc != 0)
 		return NULL;
 
 	if (ibuf_remaining(ib) == 0) {
-		if (tpm2_resp->hdr.tpm_size != ibuf_nr_read(ib))
+		if (tpm2_static_resp.hdr.tpm_size != ibuf_nr_read(ib))
 			printk(BIOS_ERR,
 			       "%s: size mismatch in response to command %#x\n",
 			       __func__, command);
-		return tpm2_resp;
+		return &tpm2_static_resp;
 	}
 
 	switch (command) {
@@ -577,11 +575,11 @@ struct tpm2_response *tpm_unmarshal_response(TPM_CC command, struct ibuf *ib)
 		break;
 
 	case TPM2_GetCapability:
-		rc |= unmarshal_get_capability(ib, &tpm2_resp->gc);
+		rc |= unmarshal_get_capability(ib, &tpm2_static_resp.gc);
 		break;
 
 	case TPM2_NV_Read:
-		rc |= unmarshal_nv_read(ib, &tpm2_resp->nvr);
+		rc |= unmarshal_nv_read(ib, &tpm2_static_resp.nvr);
 		break;
 
 	case TPM2_Hierarchy_Control:
@@ -595,7 +593,7 @@ struct tpm2_response *tpm_unmarshal_response(TPM_CC command, struct ibuf *ib)
 		break;
 
 	case TPM2_CR50_VENDOR_COMMAND:
-		rc |= unmarshal_vendor_command(ib, &tpm2_resp->vcr);
+		rc |= unmarshal_vendor_command(ib, &tpm2_static_resp.vcr);
 		break;
 
 	default:
@@ -608,7 +606,7 @@ struct tpm2_response *tpm_unmarshal_response(TPM_CC command, struct ibuf *ib)
 			       "Request to unmarshal unexpected command %#x,"
 			       " code %#x",
 			       __func__, __LINE__, command,
-			       tpm2_resp->hdr.tpm_code);
+			       tpm2_static_resp.hdr.tpm_code);
 
 			sz_left = ibuf_remaining(ib);
 			data = ibuf_oob_drain(ib, sz_left);
@@ -627,7 +625,7 @@ struct tpm2_response *tpm_unmarshal_response(TPM_CC command, struct ibuf *ib)
 		printk(BIOS_INFO,
 		       "%s:%d got %d bytes back in response to %#x,"
 		       " failed to parse (%zd)\n",
-		       __func__, __LINE__, tpm2_resp->hdr.tpm_size,
+		       __func__, __LINE__, tpm2_static_resp.hdr.tpm_size,
 		       command, ibuf_remaining(ib));
 		return NULL;
 	}
@@ -636,5 +634,5 @@ struct tpm2_response *tpm_unmarshal_response(TPM_CC command, struct ibuf *ib)
 					__func__);
 
 	/* The entire message have been parsed. */
-	return tpm2_resp;
+	return &tpm2_static_resp;
 }