GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/trusted-firmware/trusted-firmware-a-2.8/plat/arm/common/arm_tzc_dmc500.c

@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2016-2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+
+#include <platform_def.h>
+
+#include <common/debug.h>
+#include <drivers/arm/tzc_dmc500.h>
+#include <plat/arm/common/plat_arm.h>
+
+/*******************************************************************************
+ * Initialize the DMC500-TrustZone Controller for ARM standard platforms.
+ * When booting an EL3 payload, this is simplified: we configure region 0 with
+ * secure access only and do not enable any other region.
+ ******************************************************************************/
+void arm_tzc_dmc500_setup(tzc_dmc500_driver_data_t *plat_driver_data,
+			const arm_tzc_regions_info_t *tzc_regions)
+{
+#ifndef EL3_PAYLOAD_BASE
+	unsigned int region_index = 1U;
+	const arm_tzc_regions_info_t *p;
+	const arm_tzc_regions_info_t init_tzc_regions[] = {
+		ARM_TZC_REGIONS_DEF,
+		{0}
+	};
+#endif
+
+	assert(plat_driver_data);
+
+	INFO("Configuring DMC-500 TZ Settings\n");
+
+	tzc_dmc500_driver_init(plat_driver_data);
+
+#ifndef EL3_PAYLOAD_BASE
+	if (tzc_regions == NULL)
+		p = init_tzc_regions;
+	else
+		p = tzc_regions;
+
+	/* Region 0 set to no access by default */
+	tzc_dmc500_configure_region0(TZC_REGION_S_NONE, 0);
+
+	/* Rest Regions set according to tzc_regions array */
+	for (; p->base != 0ULL; p++) {
+		tzc_dmc500_configure_region(region_index, p->base, p->end,
+					    p->sec_attr, p->nsaid_permissions);
+		region_index++;
+	}
+
+	INFO("Total %u regions set.\n", region_index);
+
+#else
+	/* Allow secure access only to DRAM for EL3 payloads */
+	tzc_dmc500_configure_region0(TZC_REGION_S_RDWR, 0);
+#endif
+	/*
+	 * Raise an exception if a NS device tries to access secure memory
+	 * TODO: Add interrupt handling support.
+	 */
+	tzc_dmc500_set_action(TZC_ACTION_RV_LOWERR);
+
+	/*
+	 * Flush the configuration settings to have an affect. Validate
+	 * flush by checking FILTER_EN is set on region 1 attributes
+	 * register.
+	 */
+	tzc_dmc500_config_complete();
+
+	/*
+	 * Wait for the flush to complete.
+	 * TODO: Have a timeout for this loop
+	 */
+	while (tzc_dmc500_verify_complete())
+		;
+}