SPM: Move xlat-related functions to separate file
This is done in order to make it easier to read the file spm_main.c.
Change-Id: I21e765154c1682a319a3bc47a19a42fd736e910e
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/services/std_svc/spm/sp_xlat.c b/services/std_svc/spm/sp_xlat.c
new file mode 100644
index 0000000..b192b0c
--- /dev/null
+++ b/services/std_svc/spm/sp_xlat.c
@@ -0,0 +1,155 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <arch_helpers.h>
+#include <assert.h>
+#include <errno.h>
+#include <platform_def.h>
+#include <platform.h>
+#include <secure_partition.h>
+#include <spm_svc.h>
+#include <xlat_tables_v2.h>
+
+#include "spm_private.h"
+#include "spm_shim_private.h"
+
+/* Place translation tables by default along with the ones used by BL31. */
+#ifndef PLAT_SP_IMAGE_XLAT_SECTION_NAME
+#define PLAT_SP_IMAGE_XLAT_SECTION_NAME "xlat_table"
+#endif
+
+/* Allocate and initialise the translation context for the secure partitions. */
+REGISTER_XLAT_CONTEXT2(sp,
+ PLAT_SP_IMAGE_MMAP_REGIONS,
+ PLAT_SP_IMAGE_MAX_XLAT_TABLES,
+ PLAT_VIRT_ADDR_SPACE_SIZE, PLAT_PHY_ADDR_SPACE_SIZE,
+ EL1_EL0_REGIME, PLAT_SP_IMAGE_XLAT_SECTION_NAME);
+
+/* Lock used for SP_MEMORY_ATTRIBUTES_GET and SP_MEMORY_ATTRIBUTES_SET */
+static spinlock_t mem_attr_smc_lock;
+
+/* Get handle of Secure Partition translation context */
+xlat_ctx_t *spm_get_sp_xlat_context(void)
+{
+ return &sp_xlat_ctx;
+};
+
+/*
+ * Attributes are encoded using a different format in the SMC interface than in
+ * the Trusted Firmware, where the mmap_attr_t enum type is used. This function
+ * converts an attributes value from the SMC format to the mmap_attr_t format by
+ * setting MT_RW/MT_RO, MT_USER/MT_PRIVILEGED and MT_EXECUTE/MT_EXECUTE_NEVER.
+ * The other fields are left as 0 because they are ignored by the function
+ * change_mem_attributes().
+ */
+static unsigned int smc_attr_to_mmap_attr(unsigned int attributes)
+{
+ unsigned int tf_attr = 0U;
+
+ unsigned int access = (attributes & SP_MEMORY_ATTRIBUTES_ACCESS_MASK)
+ >> SP_MEMORY_ATTRIBUTES_ACCESS_SHIFT;
+
+ if (access == SP_MEMORY_ATTRIBUTES_ACCESS_RW) {
+ tf_attr |= MT_RW | MT_USER;
+ } else if (access == SP_MEMORY_ATTRIBUTES_ACCESS_RO) {
+ tf_attr |= MT_RO | MT_USER;
+ } else {
+ /* Other values are reserved. */
+ assert(access == SP_MEMORY_ATTRIBUTES_ACCESS_NOACCESS);
+ /* The only requirement is that there's no access from EL0 */
+ tf_attr |= MT_RO | MT_PRIVILEGED;
+ }
+
+ if ((attributes & SP_MEMORY_ATTRIBUTES_NON_EXEC) == 0) {
+ tf_attr |= MT_EXECUTE;
+ } else {
+ tf_attr |= MT_EXECUTE_NEVER;
+ }
+
+ return tf_attr;
+}
+
+/*
+ * This function converts attributes from the Trusted Firmware format into the
+ * SMC interface format.
+ */
+static unsigned int smc_mmap_to_smc_attr(unsigned int attr)
+{
+ unsigned int smc_attr = 0U;
+
+ unsigned int data_access;
+
+ if ((attr & MT_USER) == 0) {
+ /* No access from EL0. */
+ data_access = SP_MEMORY_ATTRIBUTES_ACCESS_NOACCESS;
+ } else {
+ if ((attr & MT_RW) != 0) {
+ assert(MT_TYPE(attr) != MT_DEVICE);
+ data_access = SP_MEMORY_ATTRIBUTES_ACCESS_RW;
+ } else {
+ data_access = SP_MEMORY_ATTRIBUTES_ACCESS_RO;
+ }
+ }
+
+ smc_attr |= (data_access & SP_MEMORY_ATTRIBUTES_ACCESS_MASK)
+ << SP_MEMORY_ATTRIBUTES_ACCESS_SHIFT;
+
+ if ((attr & MT_EXECUTE_NEVER) != 0U) {
+ smc_attr |= SP_MEMORY_ATTRIBUTES_NON_EXEC;
+ }
+
+ return smc_attr;
+}
+
+int32_t spm_memory_attributes_get_smc_handler(secure_partition_context_t *sp_ctx,
+ uintptr_t base_va)
+{
+ uint32_t attributes;
+
+ spin_lock(&mem_attr_smc_lock);
+
+ int rc = get_mem_attributes(sp_ctx->xlat_ctx_handle,
+ base_va, &attributes);
+
+ spin_unlock(&mem_attr_smc_lock);
+
+ /* Convert error codes of get_mem_attributes() into SPM ones. */
+ assert((rc == 0) || (rc == -EINVAL));
+
+ if (rc == 0) {
+ return (int32_t) smc_mmap_to_smc_attr(attributes);
+ } else {
+ return SPM_INVALID_PARAMETER;
+ }
+}
+
+int spm_memory_attributes_set_smc_handler(secure_partition_context_t *sp_ctx,
+ u_register_t page_address,
+ u_register_t pages_count,
+ u_register_t smc_attributes)
+{
+ uintptr_t base_va = (uintptr_t) page_address;
+ size_t size = (size_t) (pages_count * PAGE_SIZE);
+ uint32_t attributes = (uint32_t) smc_attributes;
+
+ INFO(" Start address : 0x%lx\n", base_va);
+ INFO(" Number of pages: %i (%zi bytes)\n", (int) pages_count, size);
+ INFO(" Attributes : 0x%x\n", attributes);
+
+ spin_lock(&mem_attr_smc_lock);
+
+ int ret = change_mem_attributes(sp_ctx->xlat_ctx_handle,
+ base_va, size,
+ smc_attr_to_mmap_attr(attributes));
+
+ spin_unlock(&mem_attr_smc_lock);
+
+ /* Convert error codes of change_mem_attributes() into SPM ones. */
+ assert((ret == 0) || (ret == -EINVAL));
+
+ return (ret == 0) ? SPM_SUCCESS : SPM_INVALID_PARAMETER;
+}