feat(spmc): add FF-A secure partition manager core
This patch introduces the core support for enabling an SPMC in EL3
as per the FF-A spec.
The current implemented functionality is targeted to enable
initialization of the SPMC itself and initial support for
bringing up a single S-EL1 SP.
This includes initialization of the SPMC's internal state,
parsing of an SP's manifest, preparing the cpu contexts and
appropriate system registers for the Secure Partition.
The spmc_smc_handler is the main handler for all incoming SMCs
to the SPMC, FF-A ABI handlers and functionality will
be implemented in subsequent patches.
Signed-off-by: Marc Bonnici <marc.bonnici@arm.com>
Change-Id: Ib33c240b91e54cbd018a69fec880d02adfbe12b9
diff --git a/services/std_svc/spm/el3_spmc/spmc_setup.c b/services/std_svc/spm/el3_spmc/spmc_setup.c
new file mode 100644
index 0000000..7b23c9e
--- /dev/null
+++ b/services/std_svc/spm/el3_spmc/spmc_setup.c
@@ -0,0 +1,112 @@
+/*
+ * 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);
+
+ /*
+ * 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);
+}