jcs.org
"Das U-Boot" Source Tree
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Write base ACPI tables
4 *
5 * Copyright 2021 Google LLC
6 */
7
8#define LOG_CATEGORY LOGC_ACPI
9
10#include <acpi/acpi_table.h>
11#include <dm/acpi.h>
12#include <mapmem.h>
13#include <tables_csum.h>
14#include <linux/sizes.h>
15#include <linux/errno.h>
16#include <linux/string.h>
17
18void acpi_write_rsdp(struct acpi_rsdp *rsdp, struct acpi_rsdt *rsdt,
19 struct acpi_xsdt *xsdt)
20{
21 memset(rsdp, 0, sizeof(struct acpi_rsdp));
22
23 memcpy(rsdp->signature, RSDP_SIG, 8);
24 memcpy(rsdp->oem_id, OEM_ID, 6);
25
26 if (rsdt)
27 rsdp->rsdt_address = nomap_to_sysmem(rsdt);
28
29 if (xsdt)
30 rsdp->xsdt_address = nomap_to_sysmem(xsdt);
31
32 rsdp->length = sizeof(struct acpi_rsdp);
33 rsdp->revision = ACPI_RSDP_REV_ACPI_2_0;
34
35 /* Calculate checksums */
36 rsdp->checksum = table_compute_checksum(rsdp, 20);
37 rsdp->ext_checksum = table_compute_checksum(rsdp,
38 sizeof(struct acpi_rsdp));
39}
40
41static void acpi_write_rsdt(struct acpi_rsdt *rsdt)
42{
43 struct acpi_table_header *header = &rsdt->header;
44
45 /* Fill out header fields */
46 acpi_fill_header(header, "RSDT");
47 header->length = sizeof(struct acpi_rsdt);
48 header->revision = 1;
49
50 /* Entries are filled in later, we come with an empty set */
51
52 /* Fix checksum */
53 header->checksum = table_compute_checksum(rsdt,
54 sizeof(struct acpi_rsdt));
55}
56
57static void acpi_write_xsdt(struct acpi_xsdt *xsdt)
58{
59 struct acpi_table_header *header = &xsdt->header;
60
61 /* Fill out header fields */
62 acpi_fill_header(header, "XSDT");
63 header->length = sizeof(struct acpi_xsdt);
64 header->revision = 1;
65
66 /* Entries are filled in later, we come with an empty set */
67
68 /* Fix checksum */
69 header->checksum = table_compute_checksum(xsdt,
70 sizeof(struct acpi_xsdt));
71}
72
73static int acpi_write_base(struct acpi_ctx *ctx,
74 const struct acpi_writer *entry)
75{
76 /* We need at least an RSDP and an XSDT Table */
77 ctx->rsdp = ctx->current;
78 acpi_inc_align(ctx, sizeof(struct acpi_rsdp));
79 if (map_to_sysmem(ctx->current) < SZ_4G - SZ_64K) {
80 ctx->rsdt = ctx->current;
81 acpi_inc_align(ctx, sizeof(struct acpi_rsdt));
82 } else {
83 ctx->rsdt = 0;
84 }
85 ctx->xsdt = ctx->current;
86 acpi_inc_align(ctx, sizeof(struct acpi_xsdt));
87
88 /* clear all table memory */
89 memset(ctx->base, '\0', ctx->current - ctx->base);
90
91 acpi_write_rsdp(ctx->rsdp, ctx->rsdt, ctx->xsdt);
92 if (ctx->rsdt)
93 acpi_write_rsdt(ctx->rsdt);
94 acpi_write_xsdt(ctx->xsdt);
95
96 return 0;
97}
98/*
99 * Per ACPI spec, the FACS table address must be aligned to a 64-byte boundary
100 * (Windows checks this, but Linux does not).
101 *
102 * Use the '0' prefix to put this one first
103 */
104ACPI_WRITER(0base, NULL, acpi_write_base, ACPIWF_ALIGN64);