a73b93157f
It encourages users from writing to the FSF without giving an address. Linux also prefers to drop that and their checkpatch.pl (that we imported) looks out for that. This is the result of util/scripts/no-fsf-addresses.sh with no further editing. Change-Id: Ie96faea295fe001911d77dbc51e9a6789558fbd6 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Reviewed-on: http://review.coreboot.org/11888 Tested-by: build bot (Jenkins) Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com> Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
118 lines
2.9 KiB
C
118 lines
2.9 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2012 The ChromiumOS 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 <ip_checksum.h>
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#include <pc80/mc146818rtc.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <elog.h>
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/*
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* We need a region in CMOS to store the boot counter.
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*
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* This can either be declared as part of the option
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* table or statically defined in the board config.
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*/
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#if CONFIG_USE_OPTION_TABLE
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# include "option_table.h"
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# define BOOT_COUNT_CMOS_OFFSET (CMOS_VSTART_boot_count_offset >> 3)
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#else
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# if defined(CONFIG_ELOG_BOOT_COUNT_CMOS_OFFSET) && CONFIG_ELOG_BOOT_COUNT_CMOS_OFFSET
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# define BOOT_COUNT_CMOS_OFFSET CONFIG_ELOG_BOOT_COUNT_CMOS_OFFSET
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# else
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# error "Must configure CONFIG_ELOG_BOOT_COUNT_CMOS_OFFSET"
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# endif
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#endif
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#define BOOT_COUNT_SIGNATURE 0x4342 /* 'BC' */
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struct boot_count {
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u16 signature;
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u32 count;
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u16 checksum;
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} __attribute__ ((packed));
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/* Read and validate boot count structure from CMOS */
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static int boot_count_cmos_read(struct boot_count *bc)
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{
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u8 i, *p;
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u16 csum;
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for (p = (u8*)bc, i = 0; i < sizeof(*bc); i++, p++)
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*p = cmos_read(BOOT_COUNT_CMOS_OFFSET + i);
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/* Verify signature */
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if (bc->signature != BOOT_COUNT_SIGNATURE) {
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printk(BIOS_DEBUG, "Boot Count invalid signature\n");
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return -1;
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}
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/* Verify checksum over signature and counter only */
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csum = compute_ip_checksum(bc, offsetof(struct boot_count, checksum));
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if (csum != bc->checksum) {
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printk(BIOS_DEBUG, "Boot Count checksum mismatch\n");
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return -1;
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}
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return 0;
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}
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/* Write boot count structure to CMOS */
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static void boot_count_cmos_write(struct boot_count *bc)
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{
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u8 i, *p;
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/* Checksum over signature and counter only */
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bc->checksum = compute_ip_checksum(
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bc, offsetof(struct boot_count, checksum));
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for (p = (u8*)bc, i = 0; i < sizeof(*bc); i++, p++)
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cmos_write(*p, BOOT_COUNT_CMOS_OFFSET + i);
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}
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/* Increment boot count and return the new value */
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u32 boot_count_increment(void)
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{
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struct boot_count bc;
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/* Read and increment boot count */
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if (boot_count_cmos_read(&bc) < 0) {
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/* Structure invalid, re-initialize */
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bc.signature = BOOT_COUNT_SIGNATURE;
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bc.count = 0;
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}
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/* Increment boot counter */
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bc.count++;
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/* Write the new count to CMOS */
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boot_count_cmos_write(&bc);
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printk(BIOS_DEBUG, "Boot Count incremented to %u\n", bc.count);
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return bc.count;
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}
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/* Return the current boot count */
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u32 boot_count_read(void)
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{
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struct boot_count bc;
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if (boot_count_cmos_read(&bc) < 0)
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return 0;
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return bc.count;
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}
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