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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017 Linaro
* Bryan O'Donoghue <bryan.odonoghue@linaro.org>
*/
#include <common.h>
#include <malloc.h>
#include <linux/libfdt.h>
#include <tee/optee.h>
#define optee_hdr_err_msg \
"OPTEE verification error:" \
"\n\thdr=%p image=0x%08lx magic=0x%08x tzdram 0x%08lx-0x%08lx " \
"\n\theader lo=0x%08x hi=0x%08x size=0x%08lx arch=0x%08x" \
"\n\tuimage params 0x%08lx-0x%08lx\n"
int optee_verify_image(struct optee_header *hdr, unsigned long tzdram_start,
unsigned long tzdram_len, unsigned long image_len)
{
unsigned long tzdram_end = tzdram_start + tzdram_len;
uint32_t tee_file_size;
tee_file_size = hdr->init_size + hdr->paged_size +
sizeof(struct optee_header);
if (hdr->magic != OPTEE_MAGIC ||
hdr->version != OPTEE_VERSION ||
hdr->init_load_addr_hi > tzdram_end ||
hdr->init_load_addr_lo < tzdram_start ||
tee_file_size > tzdram_len ||
tee_file_size != image_len ||
(hdr->init_load_addr_lo + tee_file_size) > tzdram_end) {
return -EINVAL;
}
return 0;
}
int optee_verify_bootm_image(unsigned long image_addr,
unsigned long image_load_addr,
unsigned long image_len)
{
struct optee_header *hdr = (struct optee_header *)image_addr;
unsigned long tzdram_start = CONFIG_OPTEE_TZDRAM_BASE;
unsigned long tzdram_len = CONFIG_OPTEE_TZDRAM_SIZE;
int ret;
ret = optee_verify_image(hdr, tzdram_start, tzdram_len, image_len);
if (ret)
goto error;
if (image_load_addr + sizeof(*hdr) != hdr->init_load_addr_lo) {
ret = -EINVAL;
goto error;
}
return ret;
error:
printf(optee_hdr_err_msg, hdr, image_addr, hdr->magic, tzdram_start,
tzdram_start + tzdram_len, hdr->init_load_addr_lo,
hdr->init_load_addr_hi, image_len, hdr->arch, image_load_addr,
image_load_addr + image_len);
return ret;
}
#if defined(CONFIG_OF_LIBFDT)
static int optee_copy_firmware_node(const void *old_blob, void *fdt_blob)
{
int old_offs, offs, ret, len;
const void *prop;
old_offs = fdt_path_offset(old_blob, "/firmware/optee");
if (old_offs < 0) {
debug("Original OP-TEE Device Tree node not found");
return old_offs;
}
offs = fdt_path_offset(fdt_blob, "/firmware");
if (offs < 0) {
offs = fdt_path_offset(fdt_blob, "/");
if (offs < 0)
return offs;
offs = fdt_add_subnode(fdt_blob, offs, "firmware");
if (offs < 0)
return offs;
}
offs = fdt_add_subnode(fdt_blob, offs, "optee");
if (offs < 0)
return ret;
/* copy the compatible property */
prop = fdt_getprop(old_blob, old_offs, "compatible", &len);
if (!prop) {
debug("missing OP-TEE compatible property");
return -EINVAL;
}
ret = fdt_setprop(fdt_blob, offs, "compatible", prop, len);
if (ret < 0)
return ret;
/* copy the method property */
prop = fdt_getprop(old_blob, old_offs, "method", &len);
if (!prop) {
debug("missing OP-TEE method property");
return -EINVAL;
}
ret = fdt_setprop(fdt_blob, offs, "method", prop, len);
if (ret < 0)
return ret;
return 0;
}
int optee_copy_fdt_nodes(const void *old_blob, void *new_blob)
{
int nodeoffset, subnode, ret;
struct fdt_resource res;
if (fdt_check_header(old_blob))
return -EINVAL;
if (fdt_check_header(new_blob))
return -EINVAL;
/* only proceed if there is an /firmware/optee node */
if (fdt_path_offset(old_blob, "/firmware/optee") < 0) {
debug("No OP-TEE firmware node in old fdt, nothing to do");
return 0;
}
/*
* Do not proceed if the target dt already has an OP-TEE node.
* In this case assume that the system knows better somehow,
* so do not interfere.
*/
if (fdt_path_offset(new_blob, "/firmware/optee") >= 0) {
debug("OP-TEE Device Tree node already exists in target");
return 0;
}
ret = optee_copy_firmware_node(old_blob, new_blob);
if (ret < 0) {
printf("Failed to add OP-TEE firmware node\n");
return ret;
}
/* optee inserts its memory regions as reserved-memory nodes */
nodeoffset = fdt_subnode_offset(old_blob, 0, "reserved-memory");
if (nodeoffset >= 0) {
subnode = fdt_first_subnode(old_blob, nodeoffset);
while (subnode >= 0) {
const char *name = fdt_get_name(old_blob,
subnode, NULL);
if (!name)
return -EINVAL;
/* only handle optee reservations */
if (strncmp(name, "optee", 5))
continue;
/* check if this subnode has a reg property */
ret = fdt_get_resource(old_blob, subnode, "reg", 0,
&res);
if (!ret) {
struct fdt_memory carveout = {
.start = res.start,
.end = res.end,
};
char *oldname, *nodename, *tmp;
oldname = strdup(name);
if (!oldname)
return -ENOMEM;
tmp = oldname;
nodename = strsep(&tmp, "@");
if (!nodename) {
free(oldname);
return -EINVAL;
}
ret = fdtdec_add_reserved_memory(new_blob,
nodename,
&carveout,
NULL);
free(oldname);
if (ret < 0)
return ret;
}
subnode = fdt_next_subnode(old_blob, subnode);
}
}
return 0;
}
#endif
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