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

source/trusted-firmware/trusted-firmware-a-2.8/bl1/aarch64/bl1_context_mgmt.c

@@ -0,0 +1,131 @@
+/*
+ * Copyright (c) 2015-2021, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+
+#include <arch_helpers.h>
+#include <context.h>
+#include <common/debug.h>
+#include <lib/el3_runtime/context_mgmt.h>
+#include <plat/common/platform.h>
+
+#include "../bl1_private.h"
+
+/* Following contains the cpu context pointers. */
+static void *bl1_cpu_context_ptr[2];
+entry_point_info_t *bl2_ep_info;
+
+
+void *cm_get_context(uint32_t security_state)
+{
+	assert(sec_state_is_valid(security_state));
+	return bl1_cpu_context_ptr[security_state];
+}
+
+void cm_set_context(void *context, uint32_t security_state)
+{
+	assert(sec_state_is_valid(security_state));
+	bl1_cpu_context_ptr[security_state] = context;
+}
+
+#if ENABLE_RME
+/*******************************************************************************
+ * This function prepares the entry point information to run BL2 in Root world,
+ * i.e. EL3, for the case when FEAT_RME is enabled.
+ ******************************************************************************/
+void bl1_prepare_next_image(unsigned int image_id)
+{
+	image_desc_t *bl2_desc;
+
+	assert(image_id == BL2_IMAGE_ID);
+
+	/* Get the image descriptor. */
+	bl2_desc = bl1_plat_get_image_desc(BL2_IMAGE_ID);
+	assert(bl2_desc != NULL);
+
+	/* Get the entry point info. */
+	bl2_ep_info = &bl2_desc->ep_info;
+
+	bl2_ep_info->spsr = (uint32_t)SPSR_64(MODE_EL3, MODE_SP_ELX,
+						DISABLE_ALL_EXCEPTIONS);
+
+	/*
+	 * Flush cache since bl2_ep_info is accessed after MMU is disabled
+	 * before jumping to BL2.
+	 */
+	flush_dcache_range((uintptr_t)bl2_ep_info, sizeof(entry_point_info_t));
+
+	/* Indicate that image is in execution state. */
+	bl2_desc->state = IMAGE_STATE_EXECUTED;
+
+	/* Print debug info and flush the console before running BL2. */
+	print_entry_point_info(bl2_ep_info);
+}
+#else
+/*******************************************************************************
+ * This function prepares the context for Secure/Normal world images.
+ * Normal world images are transitioned to EL2(if supported) else EL1.
+ ******************************************************************************/
+void bl1_prepare_next_image(unsigned int image_id)
+{
+
+	/*
+	 * Following array will be used for context management.
+	 * There are 2 instances, for the Secure and Non-Secure contexts.
+	 */
+	static cpu_context_t bl1_cpu_context[2];
+
+	unsigned int security_state, mode = MODE_EL1;
+	image_desc_t *desc;
+	entry_point_info_t *next_bl_ep;
+
+#if CTX_INCLUDE_AARCH32_REGS
+	/*
+	 * Ensure that the build flag to save AArch32 system registers in CPU
+	 * context is not set for AArch64-only platforms.
+	 */
+	if (el_implemented(1) == EL_IMPL_A64ONLY) {
+		ERROR("EL1 supports AArch64-only. Please set build flag "
+				"CTX_INCLUDE_AARCH32_REGS = 0\n");
+		panic();
+	}
+#endif
+
+	/* Get the image descriptor. */
+	desc = bl1_plat_get_image_desc(image_id);
+	assert(desc != NULL);
+
+	/* Get the entry point info. */
+	next_bl_ep = &desc->ep_info;
+
+	/* Get the image security state. */
+	security_state = GET_SECURITY_STATE(next_bl_ep->h.attr);
+
+	/* Setup the Secure/Non-Secure context if not done already. */
+	if (cm_get_context(security_state) == NULL)
+		cm_set_context(&bl1_cpu_context[security_state], security_state);
+
+	/* Prepare the SPSR for the next BL image. */
+	if ((security_state != SECURE) && (el_implemented(2) != EL_IMPL_NONE)) {
+		mode = MODE_EL2;
+	}
+
+	next_bl_ep->spsr = (uint32_t)SPSR_64((uint64_t) mode,
+		(uint64_t)MODE_SP_ELX, DISABLE_ALL_EXCEPTIONS);
+
+	/* Allow platform to make change */
+	bl1_plat_set_ep_info(image_id, next_bl_ep);
+
+	/* Prepare the context for the next BL image. */
+	cm_init_my_context(next_bl_ep);
+	cm_prepare_el3_exit(security_state);
+
+	/* Indicate that image is in execution state. */
+	desc->state = IMAGE_STATE_EXECUTED;
+
+	print_entry_point_info(next_bl_ep);
+}
+#endif /* ENABLE_RME */