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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (c) 2017 General Electric Company. All rights reserved.
- */
- #include <bootcount.h>
- #include <fs.h>
- #include <mapmem.h>
- #define BC_MAGIC 0xbd
- #define BC_VERSION 1
- typedef struct {
- u8 magic;
- u8 version;
- u8 bootcount;
- u8 upgrade_available;
- } bootcount_ext_t;
- static u8 upgrade_available = 1;
- void bootcount_store(ulong a)
- {
- bootcount_ext_t *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;
- }
- /* Only update bootcount during upgrade process */
- if (!upgrade_available)
- return;
- buf = map_sysmem(CONFIG_SYS_BOOTCOUNT_ADDR, sizeof(bootcount_ext_t));
- buf->magic = BC_MAGIC;
- buf->version = BC_VERSION;
- buf->bootcount = (a & 0xff);
- buf->upgrade_available = upgrade_available;
- unmap_sysmem(buf);
- ret = fs_write(CONFIG_SYS_BOOTCOUNT_EXT_NAME,
- CONFIG_SYS_BOOTCOUNT_ADDR, 0, sizeof(bootcount_ext_t),
- &len);
- if (ret != 0)
- puts("Error storing bootcount\n");
- }
- ulong bootcount_load(void)
- {
- bootcount_ext_t *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, sizeof(bootcount_ext_t), &len_read);
- if (ret != 0 || len_read != sizeof(bootcount_ext_t)) {
- puts("Error loading bootcount\n");
- return 0;
- }
- buf = map_sysmem(CONFIG_SYS_BOOTCOUNT_ADDR, sizeof(bootcount_ext_t));
- if (buf->magic == BC_MAGIC && buf->version == BC_VERSION) {
- upgrade_available = buf->upgrade_available;
- if (upgrade_available)
- ret = buf->bootcount;
- } else {
- puts("Incorrect bootcount file\n");
- }
- unmap_sysmem(buf);
- return ret;
- }
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