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// SPDX-License-Identifier: GPL-2.0+
/*
* Write an ACPI Secondary System Descriptor Table (SSDT) table
*
* Copyright 2021 Google LLC
*/
#define LOG_CATEGORY LOGC_ACPI
#include <acpi/acpi_table.h>
#include <dm/acpi.h>
#include <tables_csum.h>
#include <linux/errno.h>
#include <linux/string.h>
int acpi_write_ssdt(struct acpi_ctx *ctx, const struct acpi_writer *entry)
{
struct acpi_table_header *ssdt;
int ret;
ssdt = ctx->current;
memset(ssdt, '\0', sizeof(struct acpi_table_header));
acpi_fill_header(ssdt, "SSDT");
ssdt->revision = acpi_get_table_revision(ACPITAB_SSDT);
ssdt->creator_revision = 1;
ssdt->length = sizeof(struct acpi_table_header);
acpi_inc(ctx, sizeof(struct acpi_table_header));
ret = acpi_fill_ssdt(ctx);
if (ret) {
ctx->current = ssdt;
return log_msg_ret("fill", ret);
}
/* (Re)calculate length and checksum */
ssdt->length = ctx->current - (void *)ssdt;
ssdt->checksum = table_compute_checksum((void *)ssdt, ssdt->length);
log_debug("SSDT at %p, length %x\n", ssdt, ssdt->length);
/* Drop the table if it is empty */
if (ssdt->length == sizeof(struct acpi_table_header))
return log_msg_ret("fill", -ENOENT);
acpi_add_table(ctx, ssdt);
return 0;
}
ACPI_WRITER(6ssdt, "SSDT", acpi_write_ssdt, 0);
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