1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Write an ACPI Core System Resource Table (CSRT)
4 *
5 * Copyright 2021 Google LLC
6 */
7
8#define LOG_CATEGORY LOGC_ACPI
9
10#include <mapmem.h>
11#include <tables_csum.h>
12#include <acpi/acpi_table.h>
13#include <dm/acpi.h>
14#include <linux/string.h>
15
16__weak int acpi_fill_csrt(struct acpi_ctx *ctx)
17{
18	return 0;
19}
20
21int acpi_write_csrt(struct acpi_ctx *ctx, const struct acpi_writer *entry)
22{
23	struct acpi_table_header *header;
24	struct acpi_csrt *csrt;
25	int ret;
26
27	csrt = ctx->current;
28	header = &csrt->header;
29
30	memset(csrt, '\0', sizeof(struct acpi_csrt));
31
32	/* Fill out header fields */
33	acpi_fill_header(header, "CSRT");
34	header->revision = 0;
35	acpi_inc(ctx, sizeof(*header));
36
37	ret = acpi_fill_csrt(ctx);
38	if (ret)
39		return log_msg_ret("fill", ret);
40
41	/* (Re)calculate length and checksum */
42	header->length = (ulong)ctx->current - (ulong)csrt;
43	header->checksum = table_compute_checksum(csrt, header->length);
44
45	acpi_add_table(ctx, csrt);
46
47	return 0;
48}
49ACPI_WRITER(5csrt, "CSRT", acpi_write_csrt, 0);
50