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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <nos/transport.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <application.h>
/* Note: evaluates expressions multiple times */
#define MIN(a, b) (((a) < (b)) ? (a) : (b))
#define VERBOSE_LOG 0
#define DEBUG_LOG 0
#ifdef ANDROID
/* Logging for Android */
#include <sys/types.h>
#include <log/log.h>
#define NLOGE(...) ALOGE(__VA_ARGS__)
#define NLOGV(...) do { if (VERBOSE_LOG) { ALOGV(__VA_ARGS__); } } while (0)
#define NLOGD(...) do { if (DEBUG_LOG) { ALOGD(__VA_ARGS__); } } while (0)
#else
/* Logging for other platforms */
#include <stdio.h>
#define NLOGE(...) do { fprintf(stderr, __VA_ARGS__); fprintf("\n"); } while (0)
#define NLOGV(...) do { if (VERBOSE_LOG) { \
printf(__VA_ARGS__); printf("\n"); } } while (0)
#define NLOGD(...) do { if (DEBUG_LOG) { \
printf(__VA_ARGS__); printf("\n"); } } while (0)
#endif
// TODO: report the failure out of here
#define FAIL do \
{ NLOGE("FAIL at %s:%d\n", __FILE__, __LINE__); \
exit(1); \
} while (0)
/* status is non-zero on error */
static void get_status(const struct nos_device *dev,
uint8_t app_id, uint32_t *status, uint16_t *ulen)
{
uint8_t buf[6];
uint32_t command = CMD_ID(app_id) | CMD_IS_READ | CMD_TRANSPORT;
if (0 != dev->ops.read(dev->ctx, command, buf, sizeof(buf)))
FAIL;
*status = *(uint32_t *)buf;
*ulen = *(uint16_t *)(buf + 4);
}
static void clear_status(const struct nos_device *dev, uint8_t app_id)
{
uint32_t command = CMD_ID(app_id) | CMD_TRANSPORT;
if (0 != dev->ops.write(dev->ctx, command, 0, 0))
FAIL;
}
uint32_t nos_call_application(const struct nos_device *dev,
uint8_t app_id, uint16_t params,
const uint8_t *args, uint32_t arg_len,
uint8_t *reply, uint32_t *reply_len)
{
uint32_t command;
uint8_t buf[MAX_DEVICE_TRANSFER];
uint32_t status;
uint16_t ulen;
uint32_t poll_count = 0;
/* Make sure it's idle */
get_status(dev, app_id, &status, &ulen);
NLOGV("%d: query status 0x%08x ulen 0x%04x", __LINE__, status, ulen);
/* It's not idle, but we're the only ones telling it what to do, so it
* should be. */
if (status != APP_STATUS_IDLE) {
/* Try clearing the status */
NLOGV("clearing previous status");
clear_status(dev, app_id);
/* Check again */
get_status(dev, app_id, &status, &ulen);
NLOGV("%d: query status 0x%08x ulen 0x%04x\n",__LINE__,
status, ulen);
/* It's ignoring us and is still not ready, so it's broken */
if (status != APP_STATUS_IDLE)
FAIL;
}
/* Send args data */
command = CMD_ID(app_id) | CMD_TRANSPORT | CMD_IS_DATA;
do {
/*
* We can't send more than the device can take. For
* Citadel using the TPM Wait protocol on SPS, this is
* a constant. For other buses, it may not be.
*
* For each Write, Citadel requires that we send the length of
* what we're about to send in the params field.
*/
ulen = MIN(arg_len, MAX_DEVICE_TRANSFER);
CMD_SET_PARAM(command, ulen);
if (args && ulen)
memcpy(buf, args, ulen);
NLOGV("Write command 0x%08x, bytes 0x%x\n", command, ulen);
if (0 != dev->ops.write(dev->ctx, command, buf, ulen))
FAIL;
/* Additional data needs the additional flag set */
command |= CMD_MORE_TO_COME;
if (args)
args += ulen;
if (arg_len)
arg_len -= ulen;
} while (arg_len);
/* See if we had any errors while sending the args */
get_status(dev, app_id, &status, &ulen);
NLOGV("%d: query status 0x%08x ulen 0x%04x\n", __LINE__, status, ulen);
if (status & APP_STATUS_DONE)
/* Yep, problems. It should still be idle. */
goto reply;
/* Now tell the app to do whatever */
command = CMD_ID(app_id) | CMD_PARAM(params);
NLOGV("Write command 0x%08x\n", command);
if (0 != dev->ops.write(dev->ctx, command, 0, 0))
FAIL;
/* Poll the app status until it's done */
do {
get_status(dev, app_id, &status, &ulen);
NLOGD("%d: poll status 0x%08x ulen 0x%04x\n", __LINE__,
status, ulen);
poll_count++;
} while (!(status & APP_STATUS_DONE));
NLOGV("polled %d times, status 0x%08x ulen 0x%04x\n", poll_count,
status, ulen);
reply:
/* Read any result only if there's a place with room to put it */
if (reply && reply_len && *reply_len) {
uint16_t left = MIN(*reply_len, ulen);
uint16_t gimme, got;
command = CMD_ID(app_id) | CMD_IS_READ |
CMD_TRANSPORT | CMD_IS_DATA;
got = 0 ;
while (left) {
/*
* We can't read more than the device can send. For
* Citadel using the TPM Wait protocol on SPS, this is
* a constant. For other buses, it may not be.
*/
gimme = MIN(left, MAX_DEVICE_TRANSFER);
NLOGV("Read command 0x%08x, bytes 0x%x\n",
command, gimme);
if (0 != dev->ops.read(dev->ctx, command, buf, gimme))
FAIL;
memcpy(reply, buf, gimme);
reply += gimme;
left -= gimme;
got += gimme;
}
/* got it all */
*reply_len = got;
}
/* Clear the reply manually for the next caller */
command = CMD_ID(app_id) | CMD_TRANSPORT;
if (0 != dev->ops.write(dev->ctx, command, 0, 0))
FAIL;
return APP_STATUS_CODE(status);
}
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