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/*
* Copyright (c) 2021, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include "../../../../bl1/bl1_private.h"
#include <arch_helpers.h>
#include <common/debug.h>
#include <context.h>
#include <lib/el3_runtime/context_mgmt.h>
#include <plat/common/platform.h>
void cm_prepare_el2_exit(void);
/* Following contains the cpu context pointers. */
static void *bl1_cpu_context_ptr[2];
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;
}
/*******************************************************************************
* 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 %s",
"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. */
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 context for the next EL */
cm_prepare_el2_exit();
/* Indicate that image is in execution state. */
desc->state = IMAGE_STATE_EXECUTED;
print_entry_point_info(next_bl_ep);
}
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