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57ed31bcc5
This makes it easier to add params or flags for vendor commands without changing all of the command handlers. It also reduces code size by 56 bytes. For now, existing command handlers continue to use DECLARE_VENDOR_COMMAND(). Added DECLARE_VENDOR_COMMAND_P() for handlers which take the params struct directly. The CCD command will be the first user of that, since it will have different rules for 'open' based on where the command comes from. No change to existing command behavior. BUG=b:79983505 BRANCH=cr50 TEST=gsctool -I still works Change-Id: I7ed288a9c45e381162e246b50ae88cf76e67490d Signed-off-by: Randall Spangler <rspangler@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/1069538 Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
101 lines
2.9 KiB
C
101 lines
2.9 KiB
C
/* Copyright 2015 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef __EC_INCLUDE_EXTENSION_H
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#define __EC_INCLUDE_EXTENSION_H
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#include <stddef.h>
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#include <stdint.h>
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#include "common.h"
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#include "tpm_vendor_cmds.h"
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/* Flags for vendor or extension commands */
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enum vendor_cmd_flags {
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/*
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* Command is coming from the USB interface (either via the vendor
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* command endpoint or the console). If this flag is not present,
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* the command is coming from the AP.
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*/
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VENDOR_CMD_FROM_USB = (1 << 0),
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};
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/* Parameters for vendor commands */
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struct vendor_cmd_params {
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/* Command code */
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enum vendor_cmd_cc code;
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/* On input, data to be processed. On output, response data. */
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void *buffer;
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/* Number of bytes of input data */
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size_t in_size;
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/*
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* On input, size of output buffer. On output, actual response size.
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* Both in bytes. A single response byte usually indicates an error
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* and contains the error code.
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*/
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size_t out_size;
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/* Flags; zero or more of enum vendor_cmd_flags */
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uint32_t flags;
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};
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/* Type of function handling extension commands. */
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typedef enum vendor_cmd_rc
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(*extension_handler)(struct vendor_cmd_params *params);
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/**
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* Find handler for an extension command.
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*
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* Use the interface specific function call in order to check the policies for
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* handling the commands on that interface.
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*
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* @param p Parameters for the command
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* @return The return code from processing the command.
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*/
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uint32_t extension_route_command(struct vendor_cmd_params *p);
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/* Pointer table */
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struct extension_command {
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uint16_t command_code;
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extension_handler handler;
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} __packed;
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#define DECLARE_EXTENSION_COMMAND(code, func) \
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static enum vendor_cmd_rc \
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func##_wrap(struct vendor_cmd_params *params) \
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{ \
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func(params->buffer, params->in_size, \
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¶ms->out_size); \
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return 0; \
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} \
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const struct extension_command __keep __extension_cmd_##code \
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__attribute__((section(".rodata.extensioncmds"))) \
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= {.command_code = code, .handler = func##_wrap }
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/* Vendor command which takes params directly */
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#define DECLARE_VENDOR_COMMAND(cmd_code, func) \
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static enum vendor_cmd_rc \
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func##_wrap(struct vendor_cmd_params *params) \
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{ \
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func(params->code, params->buffer, params->in_size, \
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¶ms->out_size); \
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return 0; \
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} \
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const struct extension_command __keep __vendor_cmd_##cmd_code \
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__attribute__((section(".rodata.extensioncmds"))) \
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= {.command_code = cmd_code, .handler = func##_wrap}
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/* Vendor command which takes params as struct */
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#define DECLARE_VENDOR_COMMAND_P(cmd_code, func) \
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const struct extension_command __keep __vendor_cmd_##cmd_code \
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__attribute__((section(".rodata.extensioncmds"))) \
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= {.command_code = cmd_code, .handler = func}
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#endif /* __EC_INCLUDE_EXTENSION_H */
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