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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"
#include "tpm_vendor_cmds.h"
/* Flags for vendor or extension commands */
enum vendor_cmd_flags {
/*
* Command is coming from the USB interface (either via the vendor
* command endpoint or the console). If this flag is not present,
* the command is coming from the AP.
*/
VENDOR_CMD_FROM_USB = (1 << 0),
};
/* Parameters for vendor commands */
struct vendor_cmd_params {
/* Command code */
enum vendor_cmd_cc code;
/* On input, data to be processed. On output, response data. */
void *buffer;
/* Number of bytes of input data */
size_t in_size;
/*
* On input, size of output buffer. On output, actual response size.
* Both in bytes. A single response byte usually indicates an error
* and contains the error code.
*/
size_t out_size;
/* Flags; zero or more of enum vendor_cmd_flags */
uint32_t flags;
};
/* Type of function handling extension commands. */
typedef enum vendor_cmd_rc
(*extension_handler)(struct vendor_cmd_params *params);
/**
* Find handler for an extension command.
*
* Use the interface specific function call in order to check the policies for
* handling the commands on that interface.
*
* @param p Parameters for the command
* @return The return code from processing the command.
*/
uint32_t extension_route_command(struct vendor_cmd_params *p);
/* Pointer table */
struct extension_command {
uint16_t command_code;
extension_handler handler;
} __packed;
#define DECLARE_EXTENSION_COMMAND(code, func) \
static enum vendor_cmd_rc \
func##_wrap(struct vendor_cmd_params *params) \
{ \
func(params->buffer, params->in_size, \
¶ms->out_size); \
return VENDOR_RC_SUCCESS; \
} \
const struct extension_command __keep __no_sanitize_address \
__extension_cmd_##code \
__attribute__((section(".rodata.extensioncmds"))) \
= {.command_code = code, .handler = func##_wrap }
/* Vendor command which takes params directly */
#define DECLARE_VENDOR_COMMAND(cmd_code, func) \
static enum vendor_cmd_rc \
func##_wrap(struct vendor_cmd_params *params) \
{ \
return func(params->code, params->buffer, \
params->in_size, ¶ms->out_size); \
} \
const struct extension_command __keep __no_sanitize_address \
__vendor_cmd_##cmd_code \
__attribute__((section(".rodata.extensioncmds"))) \
= {.command_code = cmd_code, .handler = func##_wrap}
/* Vendor command which takes params as struct */
#define DECLARE_VENDOR_COMMAND_P(cmd_code, func) \
const struct extension_command __keep __no_sanitize_address \
__vendor_cmd_##cmd_code \
__attribute__((section(".rodata.extensioncmds"))) \
= {.command_code = cmd_code, .handler = func}
#endif /* __EC_INCLUDE_EXTENSION_H */
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