blob: 596301a43fe468bcc3dadacc093ea274e12017e6 [file] [log] [blame]
Simon Glass7ae69762023-05-04 16:54:58 -06001// SPDX-License-Identifier: GPL-2.0
2/*
3 * Utility functions for ACPI
4 *
5 * Copyright 2023 Google LLC
6 */
7
Simon Glass7ae69762023-05-04 16:54:58 -06008#include <mapmem.h>
Heinrich Schuchardt6c2e55a2025-03-22 00:21:16 +01009#include <tables_csum.h>
Simon Glass7ae69762023-05-04 16:54:58 -060010#include <acpi/acpi_table.h>
11#include <asm/global_data.h>
12
13DECLARE_GLOBAL_DATA_PTR;
14
Heinrich Schuchardt6c2e55a2025-03-22 00:21:16 +010015void acpi_update_checksum(struct acpi_table_header *header)
16{
17 header->checksum = 0;
18 header->checksum = table_compute_checksum(header, header->length);
19}
20
Simon Glass7ae69762023-05-04 16:54:58 -060021struct acpi_table_header *acpi_find_table(const char *sig)
22{
23 struct acpi_rsdp *rsdp;
24 struct acpi_rsdt *rsdt;
Heinrich Schuchardt23c14e12023-11-18 22:57:26 +010025 struct acpi_xsdt *xsdt;
Simon Glass7ae69762023-05-04 16:54:58 -060026 int len, i, count;
27
28 rsdp = map_sysmem(gd_acpi_start(), 0);
29 if (!rsdp)
30 return NULL;
Heinrich Schuchardt23c14e12023-11-18 22:57:26 +010031 if (rsdp->xsdt_address) {
Simon Glass919f8352023-12-31 08:25:54 -070032 xsdt = nomap_sysmem(rsdp->xsdt_address, 0);
Heinrich Schuchardt23c14e12023-11-18 22:57:26 +010033 len = xsdt->header.length - sizeof(xsdt->header);
34 count = len / sizeof(u64);
35 } else {
36 if (!rsdp->rsdt_address)
37 return NULL;
Simon Glass919f8352023-12-31 08:25:54 -070038 rsdt = nomap_sysmem(rsdp->rsdt_address, 0);
Heinrich Schuchardt23c14e12023-11-18 22:57:26 +010039 len = rsdt->header.length - sizeof(rsdt->header);
40 count = len / sizeof(u32);
41 }
Simon Glass7ae69762023-05-04 16:54:58 -060042 for (i = 0; i < count; i++) {
43 struct acpi_table_header *hdr;
44
Heinrich Schuchardt23c14e12023-11-18 22:57:26 +010045 if (rsdp->xsdt_address)
Simon Glass919f8352023-12-31 08:25:54 -070046 hdr = nomap_sysmem(xsdt->entry[i], 0);
Heinrich Schuchardt23c14e12023-11-18 22:57:26 +010047 else
Simon Glass919f8352023-12-31 08:25:54 -070048 hdr = nomap_sysmem(rsdt->entry[i], 0);
Simon Glass7ae69762023-05-04 16:54:58 -060049 if (!memcmp(hdr->signature, sig, ACPI_NAME_LEN))
50 return hdr;
51 if (!memcmp(hdr->signature, "FACP", ACPI_NAME_LEN)) {
52 struct acpi_fadt *fadt = (struct acpi_fadt *)hdr;
53
Heinrich Schuchardtfc7a0ee2023-12-16 09:12:00 +010054 if (!memcmp(sig, "DSDT", ACPI_NAME_LEN)) {
55 void *dsdt;
56
57 if (fadt->header.revision >= 3 && fadt->x_dsdt)
58 dsdt = nomap_sysmem(fadt->x_dsdt, 0);
59 else if (fadt->dsdt)
60 dsdt = nomap_sysmem(fadt->dsdt, 0);
61 else
62 dsdt = NULL;
63 return dsdt;
64 }
65
66 if (!memcmp(sig, "FACS", ACPI_NAME_LEN)) {
67 void *facs;
68
69 if (fadt->header.revision >= 3 &&
70 fadt->x_firmware_ctrl)
71 facs = nomap_sysmem(fadt->x_firmware_ctrl, 0);
72 else if (fadt->firmware_ctrl)
73 facs = nomap_sysmem(fadt->firmware_ctrl, 0);
74 else
75 facs = NULL;
76 return facs;
77 }
Simon Glass7ae69762023-05-04 16:54:58 -060078 }
79 }
80
81 return NULL;
82}