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// SPDX-License-Identifier: GPL-2.0+
/*
* Write base ACPI tables
*
* Copyright 2021 Google LLC
*/
#define LOG_CATEGORY LOGC_ACPI
#include <common.h>
#include <acpi/acpi_table.h>
#include <dm/acpi.h>
#include <mapmem.h>
#include <tables_csum.h>
#include <linux/sizes.h>
void acpi_write_rsdp(struct acpi_rsdp *rsdp, struct acpi_rsdt *rsdt,
struct acpi_xsdt *xsdt)
{
memset(rsdp, 0, sizeof(struct acpi_rsdp));
memcpy(rsdp->signature, RSDP_SIG, 8);
memcpy(rsdp->oem_id, OEM_ID, 6);
if (rsdt)
rsdp->rsdt_address = map_to_sysmem(rsdt);
if (xsdt)
rsdp->xsdt_address = map_to_sysmem(xsdt);
rsdp->length = sizeof(struct acpi_rsdp);
rsdp->revision = ACPI_RSDP_REV_ACPI_2_0;
/* Calculate checksums */
rsdp->checksum = table_compute_checksum(rsdp, 20);
rsdp->ext_checksum = table_compute_checksum(rsdp,
sizeof(struct acpi_rsdp));
}
static void acpi_write_rsdt(struct acpi_rsdt *rsdt)
{
struct acpi_table_header *header = &rsdt->header;
/* Fill out header fields */
acpi_fill_header(header, "RSDT");
header->length = sizeof(struct acpi_rsdt);
header->revision = 1;
/* Entries are filled in later, we come with an empty set */
/* Fix checksum */
header->checksum = table_compute_checksum(rsdt,
sizeof(struct acpi_rsdt));
}
static void acpi_write_xsdt(struct acpi_xsdt *xsdt)
{
struct acpi_table_header *header = &xsdt->header;
/* Fill out header fields */
acpi_fill_header(header, "XSDT");
header->length = sizeof(struct acpi_xsdt);
header->revision = 1;
/* Entries are filled in later, we come with an empty set */
/* Fix checksum */
header->checksum = table_compute_checksum(xsdt,
sizeof(struct acpi_xsdt));
}
static int acpi_write_base(struct acpi_ctx *ctx,
const struct acpi_writer *entry)
{
/* We need at least an RSDP and an XSDT Table */
ctx->rsdp = ctx->current;
acpi_inc_align(ctx, sizeof(struct acpi_rsdp));
if (map_to_sysmem(ctx->current) < SZ_4G - SZ_64K) {
ctx->rsdt = ctx->current;
acpi_inc_align(ctx, sizeof(struct acpi_rsdt));
} else {
ctx->rsdt = 0;
}
ctx->xsdt = ctx->current;
acpi_inc_align(ctx, sizeof(struct acpi_xsdt));
/* clear all table memory */
memset(ctx->base, '\0', ctx->current - ctx->base);
acpi_write_rsdp(ctx->rsdp, ctx->rsdt, ctx->xsdt);
if (ctx->rsdt)
acpi_write_rsdt(ctx->rsdt);
acpi_write_xsdt(ctx->xsdt);
return 0;
}
/*
* Per ACPI spec, the FACS table address must be aligned to a 64-byte boundary
* (Windows checks this, but Linux does not).
*
* Use the '0' prefix to put this one first
*/
ACPI_WRITER(0base, NULL, acpi_write_base, ACPIWF_ALIGN64);
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