services/std_svc/spm/el3_spmc/spmc_setup.c

/*
 * Copyright (c) 2022, ARM Limited and Contributors. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <assert.h>
#include <string.h>

#include <arch.h>
#include <arch_helpers.h>
#include <common/debug.h>
#include <context.h>
#include <lib/el3_runtime/context_mgmt.h>
#include <lib/utils.h>
#include <lib/xlat_tables/xlat_tables_v2.h>
#include <plat/common/common_def.h>
#include <plat/common/platform.h>
#include <services/ffa_svc.h>
#include "spm_common.h"
#include "spmc.h"

#include <platform_def.h>

/*
 * We are assuming that the index of the execution
 * context used is the linear index of the current physical cpu.
 */
unsigned int get_ec_index(struct secure_partition_desc *sp)
{
	return plat_my_core_pos();
}

/* S-EL1 partition specific initialisation. */
void spmc_el1_sp_setup(struct secure_partition_desc *sp,
		       entry_point_info_t *ep_info)
{
	/* Sanity check input arguments. */
	assert(sp != NULL);
	assert(ep_info != NULL);

	/* Initialise the SPSR for S-EL1 SPs. */
	ep_info->spsr =	SPSR_64(MODE_EL1, MODE_SP_ELX,
				DISABLE_ALL_EXCEPTIONS);

	/*
	 * TF-A Implementation defined behaviour to provide the linear
	 * core ID in the x4 register.
	 */
	ep_info->args.arg4 = (uintptr_t) plat_my_core_pos();

	/*
	 * Check whether setup is being performed for the primary or a secondary
	 * execution context. In the latter case, indicate to the SP that this
	 * is a warm boot.
	 * TODO: This check would need to be reworked if the same entry point is
	 * used for both primary and secondary initialisation.
	 */
	if (sp->secondary_ep != 0U) {
		/*
		 * Sanity check that the secondary entry point is still what was
		 * originally set.
		 */
		assert(sp->secondary_ep == ep_info->pc);
		ep_info->args.arg0 = FFA_WB_TYPE_S2RAM;
	}
}

/* Common initialisation for all SPs. */
void spmc_sp_common_setup(struct secure_partition_desc *sp,
			  entry_point_info_t *ep_info)
{
	uint16_t sp_id;

	/* Assign FF-A Partition ID if not already assigned. */
	if (sp->sp_id == INV_SP_ID) {
		sp_id = FFA_SP_ID_BASE + ACTIVE_SP_DESC_INDEX;
		/*
		 * Ensure we don't clash with previously assigned partition
		 * IDs.
		 */
		while (!is_ffa_secure_id_valid(sp_id)) {
			sp_id++;

			if (sp_id == FFA_SWD_ID_LIMIT) {
				ERROR("Unable to determine valid SP ID.\n");
				panic();
			}
		}
		sp->sp_id = sp_id;
	}

	/*
	 * We currently only support S-EL1 partitions so ensure this is the
	 * case.
	 */
	assert(sp->runtime_el == S_EL1);

	/*
	 * Clear the general purpose registers. These should be populated as
	 * required.
	 */
	zeromem(&ep_info->args, sizeof(ep_info->args));
}

/*
 * Initialise the SP context now we have populated the common and EL specific
 * entrypoint information.
 */
void spmc_sp_common_ep_commit(struct secure_partition_desc *sp,
			      entry_point_info_t *ep_info)
{
	cpu_context_t *cpu_ctx;

	cpu_ctx = &(spmc_get_sp_ec(sp)->cpu_ctx);
	print_entry_point_info(ep_info);
	cm_setup_context(cpu_ctx, ep_info);
}