1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * Write an ACPI Core System Resource Table (CSRT) 4 * 5 * Copyright 2021 Google LLC 6 */ 7 8#define LOG_CATEGORY LOGC_ACPI 9 10#include <mapmem.h> 11#include <tables_csum.h> 12#include <acpi/acpi_table.h> 13#include <dm/acpi.h> 14#include <linux/string.h> 15 16__weak int acpi_fill_csrt(struct acpi_ctx *ctx) 17{ 18 return 0; 19} 20 21int acpi_write_csrt(struct acpi_ctx *ctx, const struct acpi_writer *entry) 22{ 23 struct acpi_table_header *header; 24 struct acpi_csrt *csrt; 25 int ret; 26 27 csrt = ctx->current; 28 header = &csrt->header; 29 30 memset(csrt, '\0', sizeof(struct acpi_csrt)); 31 32 /* Fill out header fields */ 33 acpi_fill_header(header, "CSRT"); 34 header->revision = 0; 35 acpi_inc(ctx, sizeof(*header)); 36 37 ret = acpi_fill_csrt(ctx); 38 if (ret) 39 return log_msg_ret("fill", ret); 40 41 /* (Re)calculate length and checksum */ 42 header->length = (ulong)ctx->current - (ulong)csrt; 43 header->checksum = table_compute_checksum(csrt, header->length); 44 45 acpi_add_table(ctx, csrt); 46 47 return 0; 48} 49ACPI_WRITER(5csrt, "CSRT", acpi_write_csrt, 0); 50