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// SPDX-License-Identifier: BSD-2-Clause
/*
* Copyright (c) 2014, STMicroelectronics International N.V.
*/
#include <kernel/panic.h>
#include <kernel/tee_time.h>
#include <string.h>
#include <stdlib.h>
#include <trace.h>
#include <utee_defines.h>
struct tee_ta_time_offs {
TEE_UUID uuid;
TEE_Time offs;
bool positive;
};
static struct tee_ta_time_offs *tee_time_offs;
static size_t tee_time_num_offs;
static TEE_Result tee_time_ta_get_offs(const TEE_UUID *uuid,
const TEE_Time **offs, bool *positive)
{
size_t n;
for (n = 0; n < tee_time_num_offs; n++) {
if (memcmp(uuid, &tee_time_offs[n].uuid, sizeof(TEE_UUID))
== 0) {
*offs = &tee_time_offs[n].offs;
*positive = tee_time_offs[n].positive;
return TEE_SUCCESS;
}
}
return TEE_ERROR_TIME_NOT_SET;
}
static TEE_Result tee_time_ta_set_offs(const TEE_UUID *uuid,
const TEE_Time *offs, bool positive)
{
size_t n;
struct tee_ta_time_offs *o;
for (n = 0; n < tee_time_num_offs; n++) {
if (memcmp(uuid, &tee_time_offs[n].uuid, sizeof(TEE_UUID))
== 0) {
tee_time_offs[n].offs = *offs;
tee_time_offs[n].positive = positive;
return TEE_SUCCESS;
}
}
n = tee_time_num_offs + 1;
o = realloc(tee_time_offs, n * sizeof(struct tee_ta_time_offs));
if (!o)
return TEE_ERROR_OUT_OF_MEMORY;
tee_time_offs = o;
tee_time_offs[tee_time_num_offs].uuid = *uuid;
tee_time_offs[tee_time_num_offs].offs = *offs;
tee_time_offs[tee_time_num_offs].positive = positive;
tee_time_num_offs = n;
return TEE_SUCCESS;
}
TEE_Result tee_time_get_ta_time(const TEE_UUID *uuid, TEE_Time *time)
{
TEE_Result res;
const TEE_Time *offs;
bool positive;
TEE_Time t;
TEE_Time t2;
res = tee_time_ta_get_offs(uuid, &offs, &positive);
if (res != TEE_SUCCESS)
return res;
res = tee_time_get_sys_time(&t);
if (res != TEE_SUCCESS)
return res;
if (positive) {
TEE_TIME_ADD(t, *offs, t2);
/* Detect wrapping, the wrapped time should be returned. */
if (TEE_TIME_LT(t2, t))
res = TEE_ERROR_OVERFLOW;
} else {
TEE_TIME_SUB(t, *offs, t2);
/* Detect wrapping, the wrapped time should be returned. */
if (TEE_TIME_LE(t, t2))
res = TEE_ERROR_OVERFLOW;
}
*time = t2;
return res;
}
TEE_Result tee_time_set_ta_time(const TEE_UUID *uuid, const TEE_Time *time)
{
TEE_Result res;
TEE_Time offs;
TEE_Time t;
/* Check that time is normalized. */
if (time->millis >= TEE_TIME_MILLIS_BASE)
return TEE_ERROR_BAD_PARAMETERS;
res = tee_time_get_sys_time(&t);
if (res != TEE_SUCCESS)
return res;
if (TEE_TIME_LT(t, *time)) {
TEE_TIME_SUB(*time, t, offs);
return tee_time_ta_set_offs(uuid, &offs, true);
} else {
TEE_TIME_SUB(t, *time, offs);
return tee_time_ta_set_offs(uuid, &offs, false);
}
}
void tee_time_busy_wait(uint32_t milliseconds_delay)
{
TEE_Time curr;
TEE_Time delta;
TEE_Time end;
if (tee_time_get_sys_time(&curr) != TEE_SUCCESS)
panic();
delta.seconds = milliseconds_delay / 1000;
delta.millis = milliseconds_delay % 1000;
TEE_TIME_ADD(curr, delta, end);
while (TEE_TIME_LT(curr, end))
if (tee_time_get_sys_time(&curr) != TEE_SUCCESS)
panic();
}
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