blob: 3e0c9496fce0244a63663f572c0d7e1d34e430f7 [file] [log] [blame]
/*
* Copyright (c) 2018-2019, Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <arch_helpers.h>
#include <lib/spinlock.h>
#include <lib/utils_def.h>
#include <platform_def.h>
#include "./spm_private.h"
/*******************************************************************************
* Secure Service response global array. All the responses to the requests done
* to the Secure Partition are stored here. They are removed from the array as
* soon as their value is read.
******************************************************************************/
struct sprt_response {
int is_valid;
uint32_t token;
uint16_t client_id, handle;
u_register_t x1, x2, x3;
};
static struct sprt_response responses[PLAT_SPM_RESPONSES_MAX];
static spinlock_t responses_lock;
/* Add response to the global response buffer. Returns 0 on success else -1. */
int spm_response_add(uint16_t client_id, uint16_t handle, uint32_t token,
u_register_t x1, u_register_t x2, u_register_t x3)
{
spin_lock(&responses_lock);
/* Make sure that there isn't any other response with the same token. */
for (unsigned int i = 0U; i < ARRAY_SIZE(responses); i++) {
struct sprt_response *resp = &(responses[i]);
if ((resp->is_valid == 1) && (resp->token == token)) {
return -1;
}
}
for (unsigned int i = 0U; i < ARRAY_SIZE(responses); i++) {
struct sprt_response *resp = &(responses[i]);
if (resp->is_valid == 0) {
resp->token = token;
resp->client_id = client_id;
resp->handle = handle;
resp->x1 = x1;
resp->x2 = x2;
resp->x3 = x3;
dmbish();
resp->is_valid = 1;
spin_unlock(&responses_lock);
return 0;
}
}
spin_unlock(&responses_lock);
return -1;
}
/*
* Returns a response from the requests array and removes it from it. Returns 0
* on success, -1 if it wasn't found.
*/
int spm_response_get(uint16_t client_id, uint16_t handle, uint32_t token,
u_register_t *x1, u_register_t *x2, u_register_t *x3)
{
spin_lock(&responses_lock);
for (unsigned int i = 0U; i < ARRAY_SIZE(responses); i++) {
struct sprt_response *resp = &(responses[i]);
/* Ignore invalid entries */
if (resp->is_valid == 0) {
continue;
}
/* Make sure that all the information matches the stored one */
if ((resp->token != token) || (resp->client_id != client_id) ||
(resp->handle != handle)) {
continue;
}
*x1 = resp->x1;
*x2 = resp->x2;
*x3 = resp->x3;
dmbish();
resp->is_valid = 0;
spin_unlock(&responses_lock);
return 0;
}
spin_unlock(&responses_lock);
return -1;
}