bootcount_ext.c
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/*
* Copyright (c) 2017 General Electric Company. All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <bootcount.h>
#include <fs.h>
#include <mapmem.h>
#define BC_MAGIC 0xbc
void bootcount_store(ulong a)
{
u8 *buf;
loff_t len;
int ret;
if (fs_set_blk_dev(CONFIG_SYS_BOOTCOUNT_EXT_INTERFACE,
CONFIG_SYS_BOOTCOUNT_EXT_DEVPART, FS_TYPE_EXT)) {
puts("Error selecting device\n");
return;
}
buf = map_sysmem(CONFIG_SYS_BOOTCOUNT_ADDR, 2);
buf[0] = BC_MAGIC;
buf[1] = (a & 0xff);
unmap_sysmem(buf);
ret = fs_write(CONFIG_SYS_BOOTCOUNT_EXT_NAME,
CONFIG_SYS_BOOTCOUNT_ADDR, 0, 2, &len);
if (ret != 0)
puts("Error storing bootcount\n");
}
ulong bootcount_load(void)
{
u8 *buf;
loff_t len_read;
int ret;
if (fs_set_blk_dev(CONFIG_SYS_BOOTCOUNT_EXT_INTERFACE,
CONFIG_SYS_BOOTCOUNT_EXT_DEVPART, FS_TYPE_EXT)) {
puts("Error selecting device\n");
return 0;
}
ret = fs_read(CONFIG_SYS_BOOTCOUNT_EXT_NAME, CONFIG_SYS_BOOTCOUNT_ADDR,
0, 2, &len_read);
if (ret != 0 || len_read != 2) {
puts("Error loading bootcount\n");
return 0;
}
buf = map_sysmem(CONFIG_SYS_BOOTCOUNT_ADDR, 2);
if (buf[0] == BC_MAGIC)
ret = buf[1];
unmap_sysmem(buf);
return ret;
}