mirror of
https://github.com/zephyrproject-rtos/zephyr
synced 2025-09-02 01:54:29 +00:00
cb3e0e7a91
Implementation of the generic API Trusted Execution Environment driver. This implements all basic syscalls, needed by tee driver, basic defines and helpers to work with shared memory. Signed-off-by: Oleksii Moisieiev <oleksii_moisieiev@epam.com>
103 lines
1.6 KiB
C
103 lines
1.6 KiB
C
/*
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* Copyright (c) 2023 EPAM Systems
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/drivers/tee.h>
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int tee_add_shm(const struct device *dev, void *addr, size_t align, size_t size,
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uint32_t flags, struct tee_shm **shmp)
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{
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int rc;
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void *p = addr;
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struct tee_shm *shm;
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if (!shmp) {
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return -EINVAL;
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}
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if (flags & TEE_SHM_ALLOC) {
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if (align) {
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p = k_aligned_alloc(align, size);
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} else {
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p = k_malloc(size);
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}
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}
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if (!p) {
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return -ENOMEM;
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}
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shm = k_malloc(sizeof(struct tee_shm));
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if (!shm) {
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rc = -ENOMEM;
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goto err;
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}
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shm->addr = p;
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shm->size = size;
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shm->flags = flags;
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shm->dev = dev;
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if (flags & TEE_SHM_REGISTER) {
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const struct tee_driver_api *api = (const struct tee_driver_api *)dev->api;
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if (!api->shm_register) {
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rc = -ENOSYS;
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goto err;
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}
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rc = api->shm_register(dev, shm);
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if (rc) {
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goto err;
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}
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}
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*shmp = shm;
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return 0;
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err:
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k_free(shm);
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if (flags & TEE_SHM_ALLOC) {
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k_free(p);
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}
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return rc;
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}
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int tee_rm_shm(const struct device *dev, struct tee_shm *shm)
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{
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int rc = 0;
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if (!shm) {
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return -EINVAL;
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}
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if (shm->flags & TEE_SHM_REGISTER) {
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const struct tee_driver_api *api = (const struct tee_driver_api *)dev->api;
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if (api->shm_unregister) {
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/*
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* We don't return immediately if callback returned error,
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* just return this code after cleanup.
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*/
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rc = api->shm_unregister(dev, shm);
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} else {
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/*
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* Set ENOSYS is SHM_REGISTER flag was set, but callback
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* is not set.
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*/
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rc = -ENOSYS;
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}
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}
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if (shm->flags & TEE_SHM_ALLOC) {
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k_free(shm->addr);
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}
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k_free(shm);
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return rc;
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}
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