linux/drivers/firmware/efi/rci2-table.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Export Runtime Configuration Interface Table Version 2 (RCI2)
 * to sysfs
 *
 * Copyright (C) 2019 Dell Inc
 * by Narendra K <[email protected]>
 *
 * System firmware advertises the address of the RCI2 Table via
 * an EFI Configuration Table entry. This code retrieves the RCI2
 * table from the address and exports it to sysfs as a binary
 * attribute 'rci2' under /sys/firmware/efi/tables directory.
 */

#include <linux/kobject.h>
#include <linux/device.h>
#include <linux/sysfs.h>
#include <linux/efi.h>
#include <linux/types.h>
#include <linux/io.h>

#define RCI_SIGNATURE …

struct rci2_table_global_hdr { … } __packed;

static u8 *rci2_base;
static u32 rci2_table_len;
unsigned long rci2_table_phys __ro_after_init = …;

static BIN_ATTR_SIMPLE_ADMIN_RO(rci2);

static u16 checksum(void)
{ … }

static int __init efi_rci2_sysfs_init(void)
{ … }
late_initcall(efi_rci2_sysfs_init);