blob: b140b4b2ff65cd6144ccb4df18f2725748a16a80 [file] [log] [blame]
Simon Glass68000952021-12-01 09:02:56 -07001// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Write an ACPI Secondary System Descriptor Table (SSDT) table
4 *
5 * Copyright 2021 Google LLC
6 */
7
8#define LOG_CATEGORY LOGC_ACPI
9
10#include <common.h>
11#include <acpi/acpi_table.h>
12#include <dm/acpi.h>
13#include <tables_csum.h>
14
15int acpi_write_ssdt(struct acpi_ctx *ctx, const struct acpi_writer *entry)
16{
17 struct acpi_table_header *ssdt;
18 int ret;
19
20 ssdt = ctx->current;
Heinrich Schuchardtf252dfc2023-11-18 22:52:37 +010021 memset(ssdt, '\0', sizeof(struct acpi_table_header));
Simon Glass68000952021-12-01 09:02:56 -070022
23 acpi_fill_header(ssdt, "SSDT");
Simon Glass68000952021-12-01 09:02:56 -070024 ssdt->revision = acpi_get_table_revision(ACPITAB_SSDT);
25 ssdt->aslc_revision = 1;
26 ssdt->length = sizeof(struct acpi_table_header);
27
28 acpi_inc(ctx, sizeof(struct acpi_table_header));
29
30 ret = acpi_fill_ssdt(ctx);
31 if (ret) {
32 ctx->current = ssdt;
33 return log_msg_ret("fill", ret);
34 }
35
36 /* (Re)calculate length and checksum */
37 ssdt->length = ctx->current - (void *)ssdt;
38 ssdt->checksum = table_compute_checksum((void *)ssdt, ssdt->length);
39 log_debug("SSDT at %p, length %x\n", ssdt, ssdt->length);
40
41 /* Drop the table if it is empty */
42 if (ssdt->length == sizeof(struct acpi_table_header))
43 return log_msg_ret("fill", -ENOENT);
44 acpi_add_table(ctx, ssdt);
45
46 return 0;
47}
48ACPI_WRITER(6ssdt, "SSDT", acpi_write_ssdt, 0);