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-rw-r--r--src/drivers/pc80/tpm/tis.c128
-rw-r--r--src/drivers/tpm/Makefile.inc2
-rw-r--r--src/drivers/tpm/ppi_stub.c133
-rw-r--r--src/drivers/tpm/tpm_ppi.h58
4 files changed, 199 insertions, 122 deletions
diff --git a/src/drivers/pc80/tpm/tis.c b/src/drivers/pc80/tpm/tis.c
index 27d238ce75..48e529ad9f 100644
--- a/src/drivers/pc80/tpm/tis.c
+++ b/src/drivers/pc80/tpm/tis.c
@@ -21,13 +21,11 @@
#include <console/console.h>
#include <security/tpm/tis.h>
#include <device/pnp.h>
+#include <drivers/tpm/tpm_ppi.h>
#include "chip.h"
#define PREFIX "lpc_tpm: "
-/* TCG Physical Presence Interface */
-#define TPM_PPI_UUID "3dddfaa6-361b-4eb4-a424-8d10089d1653"
-/* TCG Memory Clear Interface */
-#define TPM_MCI_UUID "376054ed-cc13-4675-901c-4756d7f2d45d"
+
/* coreboot wrapper for TPM driver (start) */
#define TPM_DEBUG(fmt, args...) \
if (CONFIG(DEBUG_TPM)) { \
@@ -777,104 +775,9 @@ static void lpc_tpm_set_resources(struct device *dev)
}
#if CONFIG(HAVE_ACPI_TABLES)
-
-static void tpm_ppi_func0_cb(void *arg)
-{
- /* Functions 1-8. */
- u8 buf[] = {0xff, 0x01};
- acpigen_write_return_byte_buffer(buf, 2);
-}
-
-static void tpm_ppi_func1_cb(void *arg)
-{
- if (CONFIG(TPM2))
- /* Interface version: 2.0 */
- acpigen_write_return_string("2.0");
- else
- /* Interface version: 1.2 */
- acpigen_write_return_string("1.2");
-}
-
-static void tpm_ppi_func2_cb(void *arg)
-{
- /* Submit operations: drop on the floor and return success. */
- acpigen_write_return_byte(0);
-}
-
-static void tpm_ppi_func3_cb(void *arg)
-{
- /* Pending operation: none. */
- acpigen_emit_byte(RETURN_OP);
- acpigen_write_package(2);
- acpigen_write_byte(0);
- acpigen_write_byte(0);
- acpigen_pop_len();
-}
-static void tpm_ppi_func4_cb(void *arg)
-{
- /* Pre-OS transition method: reboot. */
- acpigen_write_return_byte(2);
-}
-static void tpm_ppi_func5_cb(void *arg)
-{
- /* Operation response: no operation executed. */
- acpigen_emit_byte(RETURN_OP);
- acpigen_write_package(3);
- acpigen_write_byte(0);
- acpigen_write_byte(0);
- acpigen_write_byte(0);
- acpigen_pop_len();
-}
-static void tpm_ppi_func6_cb(void *arg)
-{
- /*
- * Set preferred user language: deprecated and must return 3 aka
- * "not implemented".
- */
- acpigen_write_return_byte(3);
-}
-static void tpm_ppi_func7_cb(void *arg)
-{
- /* Submit operations: deny. */
- acpigen_write_return_byte(3);
-}
-static void tpm_ppi_func8_cb(void *arg)
-{
- /* All actions are forbidden. */
- acpigen_write_return_byte(1);
-}
-static void (*tpm_ppi_callbacks[])(void *) = {
- tpm_ppi_func0_cb,
- tpm_ppi_func1_cb,
- tpm_ppi_func2_cb,
- tpm_ppi_func3_cb,
- tpm_ppi_func4_cb,
- tpm_ppi_func5_cb,
- tpm_ppi_func6_cb,
- tpm_ppi_func7_cb,
- tpm_ppi_func8_cb,
-};
-
-static void tpm_mci_func0_cb(void *arg)
-{
- /* Function 1. */
- acpigen_write_return_singleton_buffer(0x3);
-}
-static void tpm_mci_func1_cb(void *arg)
-{
- /* Just return success. */
- acpigen_write_return_byte(0);
-}
-
-static void (*tpm_mci_callbacks[])(void *) = {
- tpm_mci_func0_cb,
- tpm_mci_func1_cb,
-};
-
static void lpc_tpm_fill_ssdt(const struct device *dev)
{
const char *path = acpi_device_path(dev->bus->dev);
- u32 arg;
if (!path) {
path = "\\_SB_.PCI0.LPCB";
@@ -938,31 +841,12 @@ static void lpc_tpm_fill_ssdt(const struct device *dev)
acpi_device_write_interrupt(&tpm_irq);
}
+
acpigen_write_resourcetemplate_footer();
- if (!CONFIG(CHROMEOS)) {
- /*
- * _DSM method
- */
- struct dsm_uuid ids[] = {
- /* Physical presence interface.
- * This is used to submit commands like "Clear TPM" to
- * be run at next reboot provided that user confirms
- * them. Spec allows user to cancel all commands and/or
- * configure BIOS to reject commands. So we pretend that
- * user did just this: cancelled everything. If user
- * really wants to clear TPM the only option now is to
- * do it manually in payload.
- */
- DSM_UUID(TPM_PPI_UUID, &tpm_ppi_callbacks[0],
- ARRAY_SIZE(tpm_ppi_callbacks), (void *) &arg),
- /* Memory clearing on boot: just a dummy. */
- DSM_UUID(TPM_MCI_UUID, &tpm_mci_callbacks[0],
- ARRAY_SIZE(tpm_mci_callbacks), (void *) &arg),
- };
-
- acpigen_write_dsm_uuid_arr(ids, ARRAY_SIZE(ids));
- }
+ if (!CONFIG(CHROMEOS))
+ tpm_ppi_acpi_fill_ssdt(dev);
+
acpigen_pop_len(); /* Device */
acpigen_pop_len(); /* Scope */
diff --git a/src/drivers/tpm/Makefile.inc b/src/drivers/tpm/Makefile.inc
index 4e80600ddf..5fc4632912 100644
--- a/src/drivers/tpm/Makefile.inc
+++ b/src/drivers/tpm/Makefile.inc
@@ -1 +1,3 @@
ramstage-$(CONFIG_TPM_INIT) += tpm.c
+
+ramstage-$(CONFIG_HAVE_ACPI_TABLES) += ppi_stub.c
diff --git a/src/drivers/tpm/ppi_stub.c b/src/drivers/tpm/ppi_stub.c
new file mode 100644
index 0000000000..11bd07e10a
--- /dev/null
+++ b/src/drivers/tpm/ppi_stub.c
@@ -0,0 +1,133 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <types.h>
+#include <stddef.h>
+#include <acpi/acpi.h>
+#include <acpi/acpigen.h>
+#include <acpi/acpi_device.h>
+
+#include "tpm_ppi.h"
+
+static void tpm_ppi_func0_cb(void *arg)
+{
+ /* Functions 1-8. */
+ u8 buf[] = {0xff, 0x01};
+ acpigen_write_return_byte_buffer(buf, sizeof(buf));
+}
+
+static void tpm_ppi_func1_cb(void *arg)
+{
+ if (CONFIG(TPM2))
+ /* Interface version: 2.0 */
+ acpigen_write_return_string("2.0");
+ else
+ /* Interface version: 1.2 */
+ acpigen_write_return_string("1.2");
+}
+
+static void tpm_ppi_func2_cb(void *arg)
+{
+ /* Submit operations: drop on the floor and return success. */
+ acpigen_write_return_byte(PPI2_RET_SUCCESS);
+}
+
+static void tpm_ppi_func3_cb(void *arg)
+{
+ /* Pending operation: none. */
+ acpigen_emit_byte(RETURN_OP);
+ acpigen_write_package(2);
+ acpigen_write_byte(0);
+ acpigen_write_byte(0);
+ acpigen_pop_len();
+}
+
+static void tpm_ppi_func4_cb(void *arg)
+{
+ /* Pre-OS transition method: reboot. */
+ acpigen_write_return_byte(2);
+}
+
+static void tpm_ppi_func5_cb(void *arg)
+{
+ /* Operation response: no operation executed. */
+ acpigen_emit_byte(RETURN_OP);
+ acpigen_write_package(3);
+ acpigen_write_byte(0);
+ acpigen_write_byte(0);
+ acpigen_write_byte(0);
+ acpigen_pop_len();
+}
+
+static void tpm_ppi_func6_cb(void *arg)
+{
+ /*
+ * Set preferred user language: deprecated and must return 3 AKA
+ * "not implemented".
+ */
+ acpigen_write_return_byte(PPI6_RET_NOT_IMPLEMENTED);
+}
+
+static void tpm_ppi_func7_cb(void *arg)
+{
+ /* Submit operations: deny. */
+ acpigen_write_return_byte(PPI7_RET_BLOCKED_BY_FIRMWARE);
+}
+
+static void tpm_ppi_func8_cb(void *arg)
+{
+ /* All actions are forbidden. */
+ acpigen_write_return_byte(PPI8_RET_FIRMWARE_ONLY);
+}
+
+static void (*tpm_ppi_callbacks[])(void *) = {
+ tpm_ppi_func0_cb,
+ tpm_ppi_func1_cb,
+ tpm_ppi_func2_cb,
+ tpm_ppi_func3_cb,
+ tpm_ppi_func4_cb,
+ tpm_ppi_func5_cb,
+ tpm_ppi_func6_cb,
+ tpm_ppi_func7_cb,
+ tpm_ppi_func8_cb,
+};
+
+static void tpm_mci_func0_cb(void *arg)
+{
+ /* Function 1. */
+ acpigen_write_return_singleton_buffer(0x3);
+}
+static void tpm_mci_func1_cb(void *arg)
+{
+ /* Just return success. */
+ acpigen_write_return_byte(0);
+}
+
+static void (*tpm_mci_callbacks[])(void *) = {
+ tpm_mci_func0_cb,
+ tpm_mci_func1_cb,
+};
+
+void tpm_ppi_acpi_fill_ssdt(const struct device *dev)
+{
+ /*
+ * _DSM method
+ */
+ struct dsm_uuid ids[] = {
+ /* Physical presence interface.
+ * This is used to submit commands like "Clear TPM" to
+ * be run at next reboot provided that user confirms
+ * them. Spec allows user to cancel all commands and/or
+ * configure BIOS to reject commands. So we pretend that
+ * user did just this: cancelled everything. If user
+ * really wants to clear TPM the only option now is to
+ * do it manually in payload.
+ */
+ DSM_UUID(TPM_PPI_UUID, tpm_ppi_callbacks,
+ ARRAY_SIZE(tpm_ppi_callbacks), NULL),
+ /* Memory clearing on boot: just a dummy. */
+ DSM_UUID(TPM_MCI_UUID, tpm_mci_callbacks,
+ ARRAY_SIZE(tpm_mci_callbacks), NULL),
+ };
+
+ acpigen_write_dsm_uuid_arr(ids, ARRAY_SIZE(ids));
+}
diff --git a/src/drivers/tpm/tpm_ppi.h b/src/drivers/tpm/tpm_ppi.h
new file mode 100644
index 0000000000..7662386575
--- /dev/null
+++ b/src/drivers/tpm/tpm_ppi.h
@@ -0,0 +1,58 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef _TPM_PPI_H_
+#define _TPM_PPI_H_
+
+#include <device/device.h>
+
+#if CONFIG(HAVE_ACPI_TABLES)
+void tpm_ppi_acpi_fill_ssdt(const struct device *dev);
+#else
+static inline void tpm_ppi_acpi_fill_ssdt(const struct device *dev)
+{
+}
+#endif
+
+
+/* Return codes */
+/* Function 2 */
+#define PPI2_RET_SUCCESS 0
+#define PPI2_RET_NOT_SUPPORTED 1
+#define PPI2_RET_GENERAL_FAILURE 2
+
+/* Function 3 */
+#define PPI3_RET_SUCCESS 0
+#define PPI3_RET_GENERAL_FAILURE 1
+
+/* Function 4 */
+#define PPI4_RET_NONE 0
+#define PPI4_RET_SHUTDOWN 1
+#define PPI4_RET_REBOOT 2
+#define PPI4_RET_OS_VENDOR_SPECIFIC 3
+
+/* Function 5 */
+#define PPI5_RET_SUCCESS 0
+#define PPI5_RET_GENERAL_FAILURE 1
+
+/* Function 6 */
+#define PPI6_RET_NOT_IMPLEMENTED 3
+
+/* Function 7 */
+#define PPI7_RET_SUCCESS 0
+#define PPI7_RET_NOT_IMPLEMENTED 1
+#define PPI7_RET_GENERAL_FAILURE 2
+#define PPI7_RET_BLOCKED_BY_FIRMWARE 3
+
+/* Function 8 */
+#define PPI8_RET_NOT_IMPLEMENTED 0
+#define PPI8_RET_FIRMWARE_ONLY 1
+#define PPI8_RET_BLOCKED_FOR_OS_BY_FW 2
+#define PPI8_RET_ALLOWED_WITH_PP 3
+#define PPI8_RET_ALLOWED 4
+
+/* TCG Physical Presence Interface */
+#define TPM_PPI_UUID "3dddfaa6-361b-4eb4-a424-8d10089d1653"
+/* TCG Memory Clear Interface */
+#define TPM_MCI_UUID "376054ed-cc13-4675-901c-4756d7f2d45d"
+
+#endif /* _TPM_PPI_H_ */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-25 14:13:54 +0000