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Diffstat (limited to '')
| -rw-r--r-- | services/spd/opteed/opteed_pm.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/services/spd/opteed/opteed_pm.c b/services/spd/opteed/opteed_pm.c new file mode 100644 index 0000000..fa724a1 --- /dev/null +++ b/services/spd/opteed/opteed_pm.c @@ -0,0 +1,252 @@ +/* + * 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, +}; |