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/* Copyright 2015 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "byteorder.h"
#include "console.h"
#include "extension.h"
#include "link_defs.h"
#include "util.h"
#define CPRINTS(format, args...) cprints(CC_EXTENSION, format, ## args)
uint32_t extension_route_command(uint16_t command_code,
void *buffer,
size_t in_size,
size_t *out_size,
uint32_t flags)
{
struct extension_command *cmd_p;
struct extension_command *end_p;
const char *why_ignore = "not found";
#ifdef DEBUG_EXTENSION
CPRINTS("%s(%d,%s)", __func__, command_code,
flags & VENDOR_CMD_FROM_USB ? "USB" : "AP");
#endif
/* Filter commands from USB */
if (flags & VENDOR_CMD_FROM_USB) {
switch (command_code) {
#ifdef CR50_DEV
case VENDOR_CC_IMMEDIATE_RESET:
case VENDOR_CC_INVALIDATE_INACTIVE_RW:
case VENDOR_CC_SET_BOARD_ID:
#endif /* defined(CR50_DEV) */
case EXTENSION_POST_RESET: /* Always need to reset. */
case VENDOR_CC_CCD:
case VENDOR_CC_GET_BOARD_ID:
case VENDOR_CC_RMA_CHALLENGE_RESPONSE:
case VENDOR_CC_SPI_HASH: /* Requires physical presence. */
case VENDOR_CC_TURN_UPDATE_ON:
break;
default:
/* Otherwise, we don't allow this command. */
why_ignore = "usb";
goto ignore_cmd;
}
}
#ifdef CONFIG_BOARD_ID_SUPPORT
/*
* If board ID is mismatched, allow only the commands needed to upgrade
* Cr50 firmware.
*/
if (board_id_is_mismatched()) {
switch (command_code) {
case EXTENSION_FW_UPGRADE:
case VENDOR_CC_REPORT_TPM_STATE:
case VENDOR_CC_TURN_UPDATE_ON:
case EXTENSION_POST_RESET:
break;
default:
why_ignore = "BoardID mismatch";
goto ignore_cmd;
}
}
#endif
/* Find the command handler */
cmd_p = (struct extension_command *)&__extension_cmds;
end_p = (struct extension_command *)&__extension_cmds_end;
while (cmd_p != end_p) {
if (cmd_p->command_code == command_code)
return cmd_p->handler(command_code, buffer,
in_size, out_size);
cmd_p++;
}
ignore_cmd:
/* Command not found or not allowed */
CPRINTS("%s: ignore %d: %s", __func__, command_code, why_ignore);
*out_size = 0;
return VENDOR_RC_NO_SUCH_COMMAND;
}
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