diff options
Diffstat (limited to 'common/desc_image_load.c')
-rw-r--r-- | common/desc_image_load.c | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/common/desc_image_load.c b/common/desc_image_load.c new file mode 100644 index 00000000..a9762b71 --- /dev/null +++ b/common/desc_image_load.c @@ -0,0 +1,220 @@ +/* + * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * Neither the name of ARM nor the names of its contributors may be used + * to endorse or promote products derived from this software without specific + * prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include <arch_helpers.h> +#include <assert.h> +#include <bl_common.h> +#include <desc_image_load.h> + + +extern bl_mem_params_node_t *bl_mem_params_desc_ptr; +extern unsigned int bl_mem_params_desc_num; + +static bl_load_info_t bl_load_info; +static bl_params_t next_bl_params; + + +/******************************************************************************* + * This function flushes the data structures so that they are visible + * in memory for the next BL image. + ******************************************************************************/ +void flush_bl_params_desc(void) +{ + flush_dcache_range((unsigned long)bl_mem_params_desc_ptr, + sizeof(*bl_mem_params_desc_ptr) * bl_mem_params_desc_num); +} + +/******************************************************************************* + * This function returns the index for given image_id, within the + * image descriptor array provided by bl_image_info_descs_ptr, if the + * image is found else it returns -1. + ******************************************************************************/ +int get_bl_params_node_index(unsigned int image_id) +{ + int index; + assert(image_id != INVALID_IMAGE_ID); + + for (index = 0; index < bl_mem_params_desc_num; index++) { + if (bl_mem_params_desc_ptr[index].image_id == image_id) + return index; + } + + return -1; +} + +/******************************************************************************* + * This function returns the pointer to `bl_mem_params_node_t` object for + * given image_id, within the image descriptor array provided by + * bl_mem_params_desc_ptr, if the image is found else it returns NULL. + ******************************************************************************/ +bl_mem_params_node_t *get_bl_mem_params_node(unsigned int image_id) +{ + int index; + assert(image_id != INVALID_IMAGE_ID); + + index = get_bl_params_node_index(image_id); + if (index >= 0) + return &bl_mem_params_desc_ptr[index]; + else + return NULL; +} + +/******************************************************************************* + * This function creates the list of loadable images, by populating and + * linking each `bl_load_info_node_t` type node, using the internal array + * of image descriptor provided by bl_mem_params_desc_ptr. It also populates + * and returns `bl_load_info_t` type structure that contains head of the list + * of loadable images. + ******************************************************************************/ +bl_load_info_t *get_bl_load_info_from_mem_params_desc(void) +{ + int index = 0; + + /* If there is no image to start with, return NULL */ + if (!bl_mem_params_desc_num) + return NULL; + + /* Assign initial data structures */ + bl_load_info_node_t *bl_node_info = + &bl_mem_params_desc_ptr[index].load_node_mem; + bl_load_info.head = bl_node_info; + SET_PARAM_HEAD(&bl_load_info, PARAM_BL_LOAD_INFO, VERSION_2, 0); + + /* Go through the image descriptor array and create the list */ + for (; index < bl_mem_params_desc_num; index++) { + + /* Populate the image information */ + bl_node_info->image_id = bl_mem_params_desc_ptr[index].image_id; + bl_node_info->image_info = &bl_mem_params_desc_ptr[index].image_info; + + /* Link next image if present */ + if ((index + 1) < bl_mem_params_desc_num) { + /* Get the memory and link the next node */ + bl_node_info->next_load_info = + &bl_mem_params_desc_ptr[index + 1].load_node_mem; + bl_node_info = bl_node_info->next_load_info; + } + } + + return &bl_load_info; +} + +/******************************************************************************* + * This function creates the list of executable images, by populating and + * linking each `bl_params_node_t` type node, using the internal array of + * image descriptor provided by bl_mem_params_desc_ptr. It also populates + * and returns `bl_params_t` type structure that contains head of the list + * of executable images. + ******************************************************************************/ +bl_params_t *get_next_bl_params_from_mem_params_desc(void) +{ + int count; + unsigned int img_id = 0; + int link_index = 0; + bl_params_node_t *bl_current_exec_node = NULL; + bl_params_node_t *bl_last_exec_node = NULL; + bl_mem_params_node_t *desc_ptr; + + /* If there is no image to start with, return NULL */ + if (!bl_mem_params_desc_num) + return NULL; + + /* Get the list HEAD */ + for (count = 0; count < bl_mem_params_desc_num; count++) { + + desc_ptr = &bl_mem_params_desc_ptr[count]; + + if ((EP_GET_EXE(desc_ptr->ep_info.h.attr) == EXECUTABLE) && + (EP_GET_FIRST_EXE(desc_ptr->ep_info.h.attr) == EP_FIRST_EXE)) { + next_bl_params.head = &desc_ptr->params_node_mem; + link_index = count; + break; + } + } + + /* Make sure we have a HEAD node */ + assert(next_bl_params.head != NULL); + + /* Populate the HEAD information */ + SET_PARAM_HEAD(&next_bl_params, PARAM_BL_PARAMS, VERSION_2, 0); + + /* + * Go through the image descriptor array and create the list. + * This bounded loop is to make sure that we are not looping forever. + */ + for (count = 0 ; count < bl_mem_params_desc_num; count++) { + + desc_ptr = &bl_mem_params_desc_ptr[link_index]; + + /* Make sure the image is executable */ + assert(EP_GET_EXE(desc_ptr->ep_info.h.attr) == EXECUTABLE); + + /* Get the memory for current node */ + bl_current_exec_node = &desc_ptr->params_node_mem; + + /* Populate the image information */ + bl_current_exec_node->image_id = desc_ptr->image_id; + bl_current_exec_node->image_info = &desc_ptr->image_info; + bl_current_exec_node->ep_info = &desc_ptr->ep_info; + + if (bl_last_exec_node) { + /* Assert if loop detected */ + assert(bl_last_exec_node->next_params_info == NULL); + + /* Link the previous node to the current one */ + bl_last_exec_node->next_params_info = bl_current_exec_node; + } + + /* Update the last node */ + bl_last_exec_node = bl_current_exec_node; + + /* If no next hand-off image then break out */ + img_id = desc_ptr->next_handoff_image_id; + if (img_id == INVALID_IMAGE_ID) + break; + + /* Get the index for the next hand-off image */ + link_index = get_bl_params_node_index(img_id); + assert((link_index > 0) && + (link_index < bl_mem_params_desc_num)); + } + + /* Invalid image is expected to terminate the loop */ + assert(img_id == INVALID_IMAGE_ID); + + /* Populate arg0 for the next BL image */ + next_bl_params.head->ep_info->args.arg0 = (unsigned long)&next_bl_params; + + /* Flush the parameters to be passed to the next BL image */ + flush_dcache_range((unsigned long)&next_bl_params, + sizeof(next_bl_params)); + + return &next_bl_params; +} |