/*******************************************************************************
* This cpu is being turned off. Allow the OPTEED/OPTEE to perform any actions
* needed
******************************************************************************/
static int32_t opteed_cpu_off_handler(uint64_t unused)
{
int32_t rc = 0;
uint32_t linear_id = plat_my_core_pos();
optee_context_t *optee_ctx = &opteed_sp_context[linear_id];
assert(optee_vectors);
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_vectors->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 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.
******************************************************************************/
static void opteed_cpu_on_finish_handler(uint64_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_vectors);
assert(get_optee_pstate(optee_ctx->state) == OPTEE_PSTATE_OFF);
opteed_init_optee_ep_state(&optee_on_entrypoint, opteed_rw,
(uint64_t)&optee_vectors->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(uint64_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];
assert(optee_vectors);
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_vectors->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);
}
/*******************************************************************************
* This function is responsible for handling all SMCs in the Trusted OS/App
* range from the non-secure state as defined in the SMC Calling Convention
* Document. It is also responsible for communicating with the Secure
* payload to delegate work and return results back to the non-secure
* state. Lastly it will also return any information that OPTEE needs to do
* the work assigned to it.
******************************************************************************/
uint64_t opteed_smc_handler(uint32_t smc_fid,
uint64_t x1,
uint64_t x2,
uint64_t x3,
uint64_t x4,
void *cookie,
void *handle,
uint64_t flags)
{
cpu_context_t *ns_cpu_context;
unsigned long mpidr = read_mpidr();
uint32_t linear_id = platform_get_core_pos(mpidr);
optee_context_t *optee_ctx = &opteed_sp_context[linear_id];
uint64_t rc;
/*
* Determine which security state this SMC originated from
*/
if (is_caller_non_secure(flags)) {
/*
* This is a fresh request from the non-secure client.
* The parameters are in x1 and x2. Figure out which
* registers need to be preserved, save the non-secure
* state and send the request to the secure payload.
*/
assert(handle == cm_get_context(NON_SECURE));
cm_el1_sysregs_context_save(NON_SECURE);
/*
* We are done stashing the non-secure context. Ask the
* OPTEE to do the work now.
*/
/*
* Verify if there is a valid context to use, copy the
* operation type and parameters to the secure context
* and jump to the fast smc entry point in the secure
* payload. Entry into S-EL1 will take place upon exit
* from this function.
*/
assert(&optee_ctx->cpu_ctx == cm_get_context(SECURE));
/* Set appropriate entry for SMC.
* We expect OPTEE to manage the PSTATE.I and PSTATE.F
* flags as appropriate.
*/
if (GET_SMC_TYPE(smc_fid) == SMC_TYPE_FAST) {
cm_set_elr_el3(SECURE, (uint64_t)
&optee_vectors->fast_smc_entry);
} else {
cm_set_elr_el3(SECURE, (uint64_t)
&optee_vectors->std_smc_entry);
}
cm_el1_sysregs_context_restore(SECURE);
cm_set_next_eret_context(SECURE);
/* Propagate hypervisor client ID */
write_ctx_reg(get_gpregs_ctx(&optee_ctx->cpu_ctx),
CTX_GPREG_X7,
read_ctx_reg(get_gpregs_ctx(handle),
CTX_GPREG_X7));
SMC_RET4(&optee_ctx->cpu_ctx, smc_fid, x1, x2, x3);
}
/*
* Returning from OPTEE
*/
switch (smc_fid) {
/*
* OPTEE has finished initialising itself after a cold boot
*/
case TEESMC_OPTEED_RETURN_ENTRY_DONE:
/*
* Stash the OPTEE entry points information. This is done
* only once on the primary cpu
*/
assert(optee_vectors == NULL);
optee_vectors = (optee_vectors_t *) x1;
if (optee_vectors) {
set_optee_pstate(optee_ctx->state, OPTEE_PSTATE_ON);
/*
* OPTEE has been successfully initialized.
* Register power management hooks with PSCI
*/
psci_register_spd_pm_hook(&opteed_pm);
/*
* Register an interrupt handler for S-EL1 interrupts
* when generated during code executing in the
* non-secure state.
*/
flags = 0;
set_interrupt_rm_flag(flags, NON_SECURE);
rc = register_interrupt_type_handler(INTR_TYPE_S_EL1,
opteed_sel1_interrupt_handler,
flags);
if (rc)
panic();
}
/*
* OPTEE reports completion. The OPTEED must have initiated
* the original request through a synchronous entry into
* OPTEE. Jump back to the original C runtime context.
*/
opteed_synchronous_sp_exit(optee_ctx, x1);
/*
* These function IDs is used only by OP-TEE to indicate it has
* finished:
* 1. turning itself on in response to an earlier psci
* cpu_on request
* 2. resuming itself after an earlier psci cpu_suspend
* request.
*/
case TEESMC_OPTEED_RETURN_ON_DONE:
case TEESMC_OPTEED_RETURN_RESUME_DONE:
/*
* These function IDs is used only by the SP to indicate it has
* finished:
* 1. suspending itself after an earlier psci cpu_suspend
* request.
* 2. turning itself off in response to an earlier psci
* cpu_off request.
*/
case TEESMC_OPTEED_RETURN_OFF_DONE:
case TEESMC_OPTEED_RETURN_SUSPEND_DONE:
case TEESMC_OPTEED_RETURN_SYSTEM_OFF_DONE:
case TEESMC_OPTEED_RETURN_SYSTEM_RESET_DONE:
/*
* OPTEE reports completion. The OPTEED must have initiated the
* original request through a synchronous entry into OPTEE.
* Jump back to the original C runtime context, and pass x1 as
* return value to the caller
*/
opteed_synchronous_sp_exit(optee_ctx, x1);
/*
* OPTEE is returning from a call or being preempted from a call, in
* either case execution should resume in the normal world.
*/
case TEESMC_OPTEED_RETURN_CALL_DONE:
/*
* This is the result from the secure client of an
* earlier request. The results are in x0-x3. Copy it
* into the non-secure context, save the secure state
* and return to the non-secure state.
*/
assert(handle == cm_get_context(SECURE));
cm_el1_sysregs_context_save(SECURE);
/* Get a reference to the non-secure context */
ns_cpu_context = cm_get_context(NON_SECURE);
assert(ns_cpu_context);
/* Restore non-secure state */
cm_el1_sysregs_context_restore(NON_SECURE);
cm_set_next_eret_context(NON_SECURE);
SMC_RET4(ns_cpu_context, x1, x2, x3, x4);
/*
* OPTEE has finished handling a S-EL1 FIQ interrupt. Execution
* should resume in the normal world.
*/
case TEESMC_OPTEED_RETURN_FIQ_DONE:
/* Get a reference to the non-secure context */
ns_cpu_context = cm_get_context(NON_SECURE);
assert(ns_cpu_context);
/*
* Restore non-secure state. There is no need to save the
* secure system register context since OPTEE was supposed
* to preserve it during S-EL1 interrupt handling.
*/
cm_el1_sysregs_context_restore(NON_SECURE);
cm_set_next_eret_context(NON_SECURE);
SMC_RET0((uint64_t) ns_cpu_context);
default:
panic();
}
}
