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/*
* Copyright (c) 2013-2023, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <arch_helpers.h>
#include <common/bl_common.h>
#include <common/debug.h>
#include <lib/el3_runtime/context_mgmt.h>
#include <plat/common/platform.h>
#include "opteed_private.h"
/*******************************************************************************
* The target cpu is being turned on. Allow the OPTEED/OPTEE to perform any
* actions needed. Nothing at the moment.
******************************************************************************/
static void opteed_cpu_on_handler(u_register_t target_cpu)
{
}
/*******************************************************************************
* This cpu is being turned off. Allow the OPTEED/OPTEE to perform any actions
* needed
******************************************************************************/
static int32_t opteed_cpu_off_handler(u_register_t unused)
{
int32_t rc = 0;
uint32_t linear_id = plat_my_core_pos();
optee_context_t *optee_ctx = &opteed_sp_context[linear_id];
if (get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_UNKNOWN) {
return 0;
}
assert(optee_vector_table);
assert(get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_ON);
/* Program the entry point and enter OPTEE */
cm_set_elr_el3(SECURE, (uint64_t) &optee_vector_table->cpu_off_entry);
rc = opteed_synchronous_sp_entry(optee_ctx);
/*
* Read the response from OPTEE. A non-zero return means that
* something went wrong while communicating with OPTEE.
*/
if (rc != 0)
panic();
/*
* Reset OPTEE's context for a fresh start when this cpu is turned on
* subsequently.
*/
set_optee_pstate(optee_ctx->state, OPTEE_PSTATE_OFF);
return 0;
}
/*******************************************************************************
* This cpu is being suspended. S-EL1 state must have been saved in the
* resident cpu (mpidr format) if it is a UP/UP migratable OPTEE.
******************************************************************************/
static void opteed_cpu_suspend_handler(u_register_t max_off_pwrlvl)
{
int32_t rc = 0;
uint32_t linear_id = plat_my_core_pos();
optee_context_t *optee_ctx = &opteed_sp_context[linear_id];
if (get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_UNKNOWN) {
return;
}
assert(optee_vector_table);
assert(get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_ON);
write_ctx_reg(get_gpregs_ctx(&optee_ctx->cpu_ctx), CTX_GPREG_X0,
max_off_pwrlvl);
/* Program the entry point and enter OPTEE */
cm_set_elr_el3(SECURE, (uint64_t) &optee_vector_table->cpu_suspend_entry);
rc = opteed_synchronous_sp_entry(optee_ctx);
/*
* Read the response from OPTEE. A non-zero return means that
* something went wrong while communicating with OPTEE.
*/
if (rc != 0)
panic();
/* Update its context to reflect the state OPTEE is in */
set_optee_pstate(optee_ctx->state, OPTEE_PSTATE_SUSPEND);
}
/*******************************************************************************
* This cpu has been turned on. Enter OPTEE to initialise S-EL1 and other bits
* before passing control back to the Secure Monitor. Entry in S-El1 is done
* after initialising minimal architectural state that guarantees safe
* execution.
******************************************************************************/
void opteed_cpu_on_finish_handler(u_register_t unused)
{
int32_t rc = 0;
uint32_t linear_id = plat_my_core_pos();
optee_context_t *optee_ctx = &opteed_sp_context[linear_id];
entry_point_info_t optee_on_entrypoint;
assert(optee_vector_table);
assert(get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_OFF ||
get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_UNKNOWN);
opteed_init_optee_ep_state(&optee_on_entrypoint, opteed_rw,
(uint64_t)&optee_vector_table->cpu_on_entry,
0, 0, 0, optee_ctx);
/* Initialise this cpu's secure context */
cm_init_my_context(&optee_on_entrypoint);
/* Enter OPTEE */
rc = opteed_synchronous_sp_entry(optee_ctx);
/*
* Read the response from OPTEE. A non-zero return means that
* something went wrong while communicating with OPTEE.
*/
if (rc != 0)
panic();
/* Update its context to reflect the state OPTEE is in */
set_optee_pstate(optee_ctx->state, OPTEE_PSTATE_ON);
}
/*******************************************************************************
* This cpu has resumed from suspend. The OPTEED saved the OPTEE context when it
* completed the preceding suspend call. Use that context to program an entry
* into OPTEE to allow it to do any remaining book keeping
******************************************************************************/
static void opteed_cpu_suspend_finish_handler(u_register_t max_off_pwrlvl)
{
int32_t rc = 0;
uint32_t linear_id = plat_my_core_pos();
optee_context_t *optee_ctx = &opteed_sp_context[linear_id];
if (get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_UNKNOWN) {
return;
}
assert(optee_vector_table);
assert(get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_SUSPEND);
/* Program the entry point, max_off_pwrlvl and enter the SP */
write_ctx_reg(get_gpregs_ctx(&optee_ctx->cpu_ctx),
CTX_GPREG_X0,
max_off_pwrlvl);
cm_set_elr_el3(SECURE, (uint64_t) &optee_vector_table->cpu_resume_entry);
rc = opteed_synchronous_sp_entry(optee_ctx);
/*
* Read the response from OPTEE. A non-zero return means that
* something went wrong while communicating with OPTEE.
*/
if (rc != 0)
panic();
/* Update its context to reflect the state OPTEE is in */
set_optee_pstate(optee_ctx->state, OPTEE_PSTATE_ON);
}
/*******************************************************************************
* Return the type of OPTEE the OPTEED is dealing with. Report the current
* resident cpu (mpidr format) if it is a UP/UP migratable OPTEE.
******************************************************************************/
static int32_t opteed_cpu_migrate_info(u_register_t *resident_cpu)
{
return OPTEE_MIGRATE_INFO;
}
/*******************************************************************************
* System is about to be switched off. Allow the OPTEED/OPTEE to perform
* any actions needed.
******************************************************************************/
static void opteed_system_off(void)
{
uint32_t linear_id = plat_my_core_pos();
optee_context_t *optee_ctx = &opteed_sp_context[linear_id];
/*
* OP-TEE must have been initialized in order to reach this location so
* it is safe to init the CPU context if not already done for this core.
*/
if (get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_UNKNOWN) {
opteed_cpu_on_finish_handler(0);
}
assert(optee_vector_table);
assert(get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_ON);
/* Program the entry point */
cm_set_elr_el3(SECURE, (uint64_t) &optee_vector_table->system_off_entry);
/* Enter OPTEE. We do not care about the return value because we
* must continue the shutdown anyway */
opteed_synchronous_sp_entry(optee_ctx);
}
/*******************************************************************************
* System is about to be reset. Allow the OPTEED/OPTEE to perform
* any actions needed.
******************************************************************************/
static void opteed_system_reset(void)
{
uint32_t linear_id = plat_my_core_pos();
optee_context_t *optee_ctx = &opteed_sp_context[linear_id];
/*
* OP-TEE must have been initialized in order to reach this location so
* it is safe to init the CPU context if not already done for this core.
*/
if (get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_UNKNOWN) {
opteed_cpu_on_finish_handler(0);
}
assert(optee_vector_table);
assert(get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_ON);
/* Program the entry point */
cm_set_elr_el3(SECURE, (uint64_t) &optee_vector_table->system_reset_entry);
/* Enter OPTEE. We do not care about the return value because we
* must continue the reset anyway */
opteed_synchronous_sp_entry(optee_ctx);
}
/*******************************************************************************
* Structure populated by the OPTEE Dispatcher to be given a chance to
* perform any OPTEE bookkeeping before PSCI executes a power mgmt.
* operation.
******************************************************************************/
const spd_pm_ops_t opteed_pm = {
.svc_on = opteed_cpu_on_handler,
.svc_off = opteed_cpu_off_handler,
.svc_suspend = opteed_cpu_suspend_handler,
.svc_on_finish = opteed_cpu_on_finish_handler,
.svc_suspend_finish = opteed_cpu_suspend_finish_handler,
.svc_migrate = NULL,
.svc_migrate_info = opteed_cpu_migrate_info,
.svc_system_off = opteed_system_off,
.svc_system_reset = opteed_system_reset,
};
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