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 <common.h>
11 #include <mapmem.h>
12 #include <tables_csum.h>
13 #include <acpi/acpi_table.h>
14 #include <dm/acpi.h>
15
acpi_fill_csrt(struct acpi_ctx * ctx)16 __weak int acpi_fill_csrt(struct acpi_ctx *ctx)
17 {
18 return 0;
19 }
20
acpi_write_csrt(struct acpi_ctx * ctx,const struct acpi_writer * entry)21 int 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 }
49 ACPI_WRITER(5csrt, "CSRT", acpi_write_csrt, 0);
50