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/*
* Copyright (c) 2017-2023, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <common/debug.h>
#include <lib/optee_utils.h>
#include <platform_def.h>
/*******************************************************************************
* Check if it is a valid tee header
* Return true if valid
* Return false if invalid
******************************************************************************/
static bool tee_validate_header(optee_header_t *header)
{
if ((header->magic == TEE_MAGIC_NUM_OPTEE) &&
(header->version == 2u) &&
(header->nb_images > 0u) &&
(header->nb_images <= OPTEE_MAX_NUM_IMAGES)) {
return true;
}
return false;
}
bool optee_header_is_valid(uintptr_t header_base)
{
return tee_validate_header((optee_header_t *)header_base);
}
/*******************************************************************************
* Parse the OPTEE image
* Return 0 on success or a negative error code otherwise.
******************************************************************************/
static int parse_optee_image(image_info_t *image_info,
optee_image_t *image)
{
uintptr_t init_load_addr, free_end, requested_end;
size_t init_size;
init_load_addr = ((uint64_t)image->load_addr_hi << 32) |
image->load_addr_lo;
init_size = image->size;
/*
* image->load_addr_hi & image->load_addr_lo set to UINT32_MAX indicate
* loader decided address; take our pre-mapped area for current image
* since arm-tf could not allocate memory dynamically
*/
if ((image->load_addr_hi == UINT32_MAX) &&
(image->load_addr_lo == UINT32_MAX)) {
init_load_addr = image_info->image_base;
}
/* Check that the default end address doesn't overflow */
if (check_uptr_overflow(image_info->image_base,
image_info->image_max_size - 1))
return -1;
free_end = image_info->image_base + (image_info->image_max_size - 1);
/* Check that the image end address doesn't overflow */
if (check_uptr_overflow(init_load_addr, init_size - 1))
return -1;
requested_end = init_load_addr + (init_size - 1);
/*
* Check that the requested RAM location is within reserved
* space for OPTEE.
*/
if (!((init_load_addr >= image_info->image_base) &&
(requested_end <= free_end))) {
WARN("The load address in optee header %p - %p is not in reserved area: %p - %p.\n",
(void *)init_load_addr,
(void *)(init_load_addr + init_size),
(void *)image_info->image_base,
(void *)(image_info->image_base +
image_info->image_max_size));
return -1;
}
/*
* Remove the skip attr from image_info, the image will be loaded.
* The default attr in image_info is "IMAGE_ATTRIB_SKIP_LOADING", which
* mean the image will not be loaded. Here, we parse the header image to
* know that the extra image need to be loaded, so remove the skip attr.
*/
image_info->h.attr &= ~IMAGE_ATTRIB_SKIP_LOADING;
/* Update image base and size of image_info */
image_info->image_base = init_load_addr;
image_info->image_size = init_size;
return 0;
}
/*******************************************************************************
* Parse the OPTEE header
* Return 0 on success or a negative error code otherwise.
******************************************************************************/
int parse_optee_header(entry_point_info_t *header_ep,
image_info_t *pager_image_info,
image_info_t *paged_image_info)
{
optee_header_t *header;
uint32_t num;
int ret;
assert(header_ep);
header = (optee_header_t *)header_ep->pc;
assert(header);
/* Print the OPTEE header information */
INFO("OPTEE ep=0x%x\n", (unsigned int)header_ep->pc);
INFO("OPTEE header info:\n");
INFO(" magic=0x%x\n", header->magic);
INFO(" version=0x%x\n", header->version);
INFO(" arch=0x%x\n", header->arch);
INFO(" flags=0x%x\n", header->flags);
INFO(" nb_images=0x%x\n", header->nb_images);
/*
* OPTEE image has 3 types:
*
* 1. Plain OPTEE bin without header.
* Original bin without header, return directly,
* BL32_EXTRA1_IMAGE_ID and BL32_EXTRA2_IMAGE_ID will be skipped.
*
* 2. OPTEE bin with header bin, but no paging.
* Header available and nb_images = 1, remove skip attr for
* BL32_EXTRA1_IMAGE_ID. BL32_EXTRA1_IMAGE_ID will be loaded,
* and BL32_EXTRA2_IMAGE_ID be skipped.
*
* 3. OPTEE image with paging support.
* Header available and nb_images = 2, there are 3 bins: header,
* pager and pageable. Remove skip attr for BL32_EXTRA1_IMAGE_ID
* and BL32_EXTRA2_IMAGE_ID to load pager and paged bin.
*/
if (!tee_validate_header(header)) {
INFO("Invalid OPTEE header, set legacy mode.\n");
#ifdef __aarch64__
header_ep->args.arg0 = MODE_RW_64;
#else
header_ep->args.arg0 = MODE_RW_32;
#endif
return 0;
}
/* Parse OPTEE image */
for (num = 0U; num < header->nb_images; num++) {
if (header->optee_image_list[num].image_id ==
OPTEE_PAGER_IMAGE_ID) {
ret = parse_optee_image(pager_image_info,
&header->optee_image_list[num]);
} else if (header->optee_image_list[num].image_id ==
OPTEE_PAGED_IMAGE_ID) {
if (paged_image_info == NULL) {
if (header->optee_image_list[num].size != 0U) {
ERROR("Paged image is not supported\n");
return -1;
}
continue;
} else {
ret = parse_optee_image(paged_image_info,
&header->optee_image_list[num]);
}
} else {
ERROR("Parse optee image failed.\n");
return -1;
}
if (ret != 0)
return -1;
}
/*
* Update "pc" value which should comes from pager image. After the
* header image is parsed, it will be unuseful, and the actual
* execution image after BL31 is pager image.
*/
header_ep->pc = pager_image_info->image_base;
/*
* The paged load address and size are populated in
* header image arguments so that can be read by the
* BL32 SPD.
*/
if (paged_image_info != NULL) {
header_ep->args.arg1 = paged_image_info->image_base;
header_ep->args.arg2 = paged_image_info->image_size;
}
/* Set OPTEE runtime arch - aarch32/aarch64 */
if (header->arch == 0) {
header_ep->args.arg0 = MODE_RW_32;
} else {
#ifdef __aarch64__
header_ep->args.arg0 = MODE_RW_64;
#else
ERROR("Cannot boot an AArch64 OP-TEE\n");
return -1;
#endif
}
return 0;
}
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