Adding upstream version 2.10.0+dfsg.upstream/2.10.0+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 172 insertions, 0 deletions

diff --git a/bl1/aarch32/bl1_context_mgmt.c b/bl1/aarch32/bl1_context_mgmt.c
new file mode 100644
index 0000000..85d35a7
--- /dev/null
+++ b/bl1/aarch32/bl1_context_mgmt.c
@@ -0,0 +1,172 @@
+/*
+ * Copyright (c) 2016-2020, 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 <smccc_helpers.h>
+
+#include "../bl1_private.h"
+
+/*
+ * Following arrays 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];
+static smc_ctx_t bl1_smc_context[2];
+
+/* Following contains the next cpu context pointer. */
+static void *bl1_next_cpu_context_ptr;
+
+/* Following contains the next smc context pointer. */
+static void *bl1_next_smc_context_ptr;
+
+/* Following functions are used for SMC context handling */
+void *smc_get_ctx(unsigned int security_state)
+{
+	assert(sec_state_is_valid(security_state));
+	return &bl1_smc_context[security_state];
+}
+
+void smc_set_next_ctx(unsigned int security_state)
+{
+	assert(sec_state_is_valid(security_state));
+	bl1_next_smc_context_ptr = &bl1_smc_context[security_state];
+}
+
+void *smc_get_next_ctx(void)
+{
+	return bl1_next_smc_context_ptr;
+}
+
+/* Following functions are used for CPU context handling */
+void *cm_get_context(uint32_t security_state)
+{
+	assert(sec_state_is_valid(security_state));
+	return &bl1_cpu_context[security_state];
+}
+
+void cm_set_next_context(void *context)
+{
+	assert(context != NULL);
+	bl1_next_cpu_context_ptr = context;
+}
+
+void *cm_get_next_context(void)
+{
+	return bl1_next_cpu_context_ptr;
+}
+
+/*******************************************************************************
+ * Following function copies GP regs r0-r4, lr and spsr,
+ * from the CPU context to the SMC context structures.
+ ******************************************************************************/
+static void copy_cpu_ctx_to_smc_ctx(const regs_t *cpu_reg_ctx,
+		smc_ctx_t *next_smc_ctx)
+{
+	next_smc_ctx->r0 = read_ctx_reg(cpu_reg_ctx, CTX_GPREG_R0);
+	next_smc_ctx->r1 = read_ctx_reg(cpu_reg_ctx, CTX_GPREG_R1);
+	next_smc_ctx->r2 = read_ctx_reg(cpu_reg_ctx, CTX_GPREG_R2);
+	next_smc_ctx->r3 = read_ctx_reg(cpu_reg_ctx, CTX_GPREG_R3);
+	next_smc_ctx->lr_mon = read_ctx_reg(cpu_reg_ctx, CTX_LR);
+	next_smc_ctx->spsr_mon = read_ctx_reg(cpu_reg_ctx, CTX_SPSR);
+	next_smc_ctx->scr = read_ctx_reg(cpu_reg_ctx, CTX_SCR);
+}
+
+/*******************************************************************************
+ * Following function flushes the SMC & CPU context pointer and its data.
+ ******************************************************************************/
+static void flush_smc_and_cpu_ctx(void)
+{
+	flush_dcache_range((uintptr_t)&bl1_next_smc_context_ptr,
+		sizeof(bl1_next_smc_context_ptr));
+	flush_dcache_range((uintptr_t)bl1_next_smc_context_ptr,
+		sizeof(smc_ctx_t));
+
+	flush_dcache_range((uintptr_t)&bl1_next_cpu_context_ptr,
+		sizeof(bl1_next_cpu_context_ptr));
+	flush_dcache_range((uintptr_t)bl1_next_cpu_context_ptr,
+		sizeof(cpu_context_t));
+}
+
+/*******************************************************************************
+ * This function prepares the context for Secure/Normal world images.
+ * Normal world images are transitioned to HYP(if supported) else SVC.
+ ******************************************************************************/
+void bl1_prepare_next_image(unsigned int image_id)
+{
+	unsigned int security_state, mode = MODE32_svc;
+	image_desc_t *desc;
+	entry_point_info_t *next_bl_ep;
+
+	/* 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);
+
+	/* Prepare the SPSR for the next BL image. */
+	if ((security_state != SECURE) && (GET_VIRT_EXT(read_id_pfr1()) != 0U)) {
+		mode = MODE32_hyp;
+	}
+
+	next_bl_ep->spsr = SPSR_MODE32(mode, SPSR_T_ARM,
+				SPSR_E_LITTLE, DISABLE_ALL_EXCEPTIONS);
+
+	/* Allow platform to make change */
+	bl1_plat_set_ep_info(image_id, next_bl_ep);
+
+	/* Prepare the cpu context for the next BL image. */
+	cm_init_my_context(next_bl_ep);
+	cm_prepare_el3_exit(security_state);
+	cm_set_next_context(cm_get_context(security_state));
+
+	/* Prepare the smc context for the next BL image. */
+	smc_set_next_ctx(security_state);
+	copy_cpu_ctx_to_smc_ctx(get_regs_ctx(cm_get_next_context()),
+		smc_get_next_ctx());
+
+	/*
+	 * If the next image is non-secure, then we need to program the banked
+	 * non secure sctlr. This is not required when the next image is secure
+	 * because in AArch32, we expect the secure world to have the same
+	 * SCTLR settings.
+	 */
+	if (security_state == NON_SECURE) {
+		cpu_context_t *ctx = cm_get_context(security_state);
+		u_register_t ns_sctlr;
+
+		/* Temporarily set the NS bit to access NS SCTLR */
+		write_scr(read_scr() | SCR_NS_BIT);
+		isb();
+
+		ns_sctlr = read_ctx_reg(get_regs_ctx(ctx), CTX_NS_SCTLR);
+		write_sctlr(ns_sctlr);
+		isb();
+
+		write_scr(read_scr() & ~SCR_NS_BIT);
+		isb();
+	}
+
+	/*
+	 * Flush the SMC & CPU context and the (next)pointers,
+	 * to access them after caches are disabled.
+	 */
+	flush_smc_and_cpu_ctx();
+
+	/* Indicate that image is in execution state. */
+	desc->state = IMAGE_STATE_EXECUTED;
+
+	print_entry_point_info(next_bl_ep);
+}