diff options
author | Patrick Georgi <pgeorgi@google.com> | 2018-03-14 21:11:21 +0100 |
---|---|---|
committer | Patrick Georgi <pgeorgi@google.com> | 2018-10-08 09:46:30 +0000 |
commit | 9360feaf5121fb0b4b2d63e3168effe066650071 (patch) | |
tree | dae8bcba4a33a3920e1b57e5f2d9033fa763b32d /src/drivers/smmstore/smi.c | |
parent | 88607a4b1002ed6acc7f316f274feea2fd861095 (diff) | |
download | coreboot-9360feaf5121fb0b4b2d63e3168effe066650071.tar.xz |
smmstore: Add a key/val store facility in flash, mediated through SMM
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>
Diffstat (limited to 'src/drivers/smmstore/smi.c')
-rw-r--r-- | src/drivers/smmstore/smi.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/src/drivers/smmstore/smi.c b/src/drivers/smmstore/smi.c new file mode 100644 index 0000000000..3bcf564e1a --- /dev/null +++ b/src/drivers/smmstore/smi.c @@ -0,0 +1,83 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2018 The Chromium OS Authors. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <console/console.h> +#include <smmstore.h> +#include <stddef.h> +#include <stdint.h> + +/* + * Check that the given range is legal. + * + * Legal means: + * - not pointing into SMRAM + * - ...? + * + * returns 0 on success, -1 on failure + */ +static int range_check(void *start, size_t size) +{ + // TODO: fill in + return 0; +} + +/* Param is usually EBX, ret in EAX */ +uint32_t smmstore_exec(uint8_t command, void *param) +{ + uint32_t ret = SMMSTORE_RET_FAILURE; + + switch (command) { + case SMMSTORE_CMD_READ: { + printk(BIOS_DEBUG, "Reading from SMM store\n"); + struct smmstore_params_read *params = param; + + if (range_check(params->buf, params->bufsize) != 0) + break; + + if (smmstore_read_region(params->buf, ¶ms->bufsize) == 0) + ret = SMMSTORE_RET_SUCCESS; + break; + } + + case SMMSTORE_CMD_APPEND: { + printk(BIOS_DEBUG, "Appending into SMM store\n"); + struct smmstore_params_append *params = param; + + if (range_check(params->key, params->keysize) != 0) + break; + if (range_check(params->val, params->valsize) != 0) + break; + + if (smmstore_append_data(params->key, params->keysize, + params->val, params->valsize) == 0) + ret = SMMSTORE_RET_SUCCESS; + break; + } + + case SMMSTORE_CMD_CLEAR: { + if (smmstore_clear_region() == 0) + ret = SMMSTORE_RET_SUCCESS; + break; + } + + default: + printk(BIOS_DEBUG, + "Unknown SMM store command: 0x%02x\n", command); + ret = SMMSTORE_RET_UNSUPPORTED; + break; + } + + return ret; +} |