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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.
*/
#ifndef __EC_INCLUDE_EXTENSION_H
#define __EC_INCLUDE_EXTENSION_H
#include <stddef.h>
#include <stdint.h>
#include "common.h"
/*
* Type of function handling extension commands.
*
* @param buffer As input points to the input data to be processed, as
* output stores data, processing result.
* @param command_size Number of bytes of input data
* @param response_size On input - max size of the buffer, on output - actual
* number of data returned by the handler.
*/
typedef void (*extension_handler)(void *buffer,
size_t command_size,
size_t *response_size);
/*
* Find handler for an extension command.
*
* @param command_code Code associated with a extension command handler.
* @param buffer Data to be processd by the handler, the same space
* is used for data returned by the handler.
* @command_size Size of the input data.
* @param size On input - max size of the buffer, on output - actual number of
* data returned by the handler. A single byte return
* usually indicates an error and contains the error code.
*/
void extension_route_command(uint16_t command_code,
void *buffer,
size_t command_size,
size_t *size);
struct extension_command {
uint16_t command_code;
extension_handler handler;
} __packed;
/* Values for different extension subcommands. */
enum {
EXTENSION_AES = 0,
EXTENSION_HASH = 1,
EXTENSION_RSA = 2,
EXTENSION_EC = 3,
};
/* Error codes reported by extension commands. */
enum {
/* EXTENSION_HASH error codes */
/* Attempt to start a session on an active handle. */
EXC_HASH_DUPLICATED_HANDLE = 1,
EXC_HASH_TOO_MANY_HANDLES = 2, /* No room to allocate a new context. */
/* Continuation/finish on unknown context. */
EXC_HASH_UNKNOWN_CONTEXT = 3
};
#define DECLARE_EXTENSION_COMMAND(code, handler) \
const struct extension_command __keep __extension_cmd_##code \
__attribute__((section(".rodata.extensioncmds"))) \
= {code, handler}
#endif /* __EC_INCLUDE_EXTENSION_H */
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