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/* SPDX-License-Identifier: GPL-2.0-only */
#include <types.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: 1.3 */
acpigen_write_return_string("1.3");
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));
}
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