9360feaf51
It exposes an interface that is as generic as possible, so payloads and/or kernels can use it for their data. Change-Id: I9553922f9dfa60b9d4b3576973ad4b84d3fe2fb5 Signed-off-by: Patrick Georgi <pgeorgi@google.com> Reviewed-on: https://review.coreboot.org/25182 Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
84 lines
2.0 KiB
C
84 lines
2.0 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2018 The Chromium OS Authors. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <console/console.h>
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#include <smmstore.h>
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#include <stddef.h>
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#include <stdint.h>
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/*
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* Check that the given range is legal.
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*
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* Legal means:
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* - not pointing into SMRAM
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* - ...?
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*
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* returns 0 on success, -1 on failure
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*/
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static int range_check(void *start, size_t size)
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{
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// TODO: fill in
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return 0;
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}
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/* Param is usually EBX, ret in EAX */
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uint32_t smmstore_exec(uint8_t command, void *param)
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{
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uint32_t ret = SMMSTORE_RET_FAILURE;
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switch (command) {
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case SMMSTORE_CMD_READ: {
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printk(BIOS_DEBUG, "Reading from SMM store\n");
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struct smmstore_params_read *params = param;
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if (range_check(params->buf, params->bufsize) != 0)
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break;
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if (smmstore_read_region(params->buf, ¶ms->bufsize) == 0)
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ret = SMMSTORE_RET_SUCCESS;
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break;
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}
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case SMMSTORE_CMD_APPEND: {
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printk(BIOS_DEBUG, "Appending into SMM store\n");
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struct smmstore_params_append *params = param;
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if (range_check(params->key, params->keysize) != 0)
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break;
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if (range_check(params->val, params->valsize) != 0)
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break;
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if (smmstore_append_data(params->key, params->keysize,
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params->val, params->valsize) == 0)
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ret = SMMSTORE_RET_SUCCESS;
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break;
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}
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case SMMSTORE_CMD_CLEAR: {
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if (smmstore_clear_region() == 0)
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ret = SMMSTORE_RET_SUCCESS;
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break;
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}
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default:
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printk(BIOS_DEBUG,
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"Unknown SMM store command: 0x%02x\n", command);
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ret = SMMSTORE_RET_UNSUPPORTED;
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break;
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}
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return ret;
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}
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