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bbc78592b1
Use acpi_update_checksum() for updating ACPI table header checksum. Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com> Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> Reviewed-by: Matthias Brugger <mbrugger@suse.com>
48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Write an ACPI Secondary System Descriptor Table (SSDT) table
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*
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* Copyright 2021 Google LLC
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*/
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#define LOG_CATEGORY LOGC_ACPI
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#include <acpi/acpi_table.h>
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#include <dm/acpi.h>
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#include <tables_csum.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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int acpi_write_ssdt(struct acpi_ctx *ctx, const struct acpi_writer *entry)
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{
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struct acpi_table_header *ssdt;
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int ret;
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ssdt = ctx->current;
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memset(ssdt, '\0', sizeof(struct acpi_table_header));
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acpi_fill_header(ssdt, "SSDT");
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ssdt->revision = acpi_get_table_revision(ACPITAB_SSDT);
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ssdt->length = sizeof(struct acpi_table_header);
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acpi_inc(ctx, sizeof(struct acpi_table_header));
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ret = acpi_fill_ssdt(ctx);
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if (ret) {
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ctx->current = ssdt;
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return log_msg_ret("fill", ret);
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}
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/* (Re)calculate length and checksum */
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ssdt->length = ctx->current - (void *)ssdt;
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acpi_update_checksum(ssdt);
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log_debug("SSDT at %p, length %x\n", ssdt, ssdt->length);
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/* Drop the table if it is empty */
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if (ssdt->length == sizeof(struct acpi_table_header))
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return log_msg_ret("fill", -ENOENT);
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acpi_add_table(ctx, ssdt);
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return 0;
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}
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ACPI_WRITER(6ssdt, "SSDT", acpi_write_ssdt, 0);
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