65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Write an ACPI MCFG table
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*
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* Copyright 2022 Google LLC
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*/
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#define LOG_CATEGORY LOGC_ACPI
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#include <common.h>
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#include <mapmem.h>
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#include <tables_csum.h>
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#include <acpi/acpi_table.h>
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#include <dm/acpi.h>
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int acpi_create_mcfg_mmconfig(struct acpi_mcfg_mmconfig *mmconfig, u32 base,
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u16 seg_nr, u8 start, u8 end)
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{
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memset(mmconfig, 0, sizeof(*mmconfig));
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mmconfig->base_address_l = base;
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mmconfig->base_address_h = 0;
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mmconfig->pci_segment_group_number = seg_nr;
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mmconfig->start_bus_number = start;
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mmconfig->end_bus_number = end;
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return sizeof(struct acpi_mcfg_mmconfig);
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}
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__weak int acpi_fill_mcfg(struct acpi_ctx *ctx)
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{
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return -ENOENT;
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}
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/* MCFG is defined in the PCI Firmware Specification 3.0 */
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int acpi_write_mcfg(struct acpi_ctx *ctx, const struct acpi_writer *entry)
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{
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struct acpi_table_header *header;
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struct acpi_mcfg *mcfg;
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int ret;
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mcfg = ctx->current;
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header = &mcfg->header;
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memset(mcfg, '\0', sizeof(struct acpi_mcfg));
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/* Fill out header fields */
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acpi_fill_header(header, "MCFG");
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header->length = sizeof(struct acpi_mcfg);
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header->revision = 1;
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acpi_inc(ctx, sizeof(*mcfg));
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ret = acpi_fill_mcfg(ctx);
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if (ret)
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return log_msg_ret("fill", ret);
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/* (Re)calculate length and checksum */
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header->length = (ulong)ctx->current - (ulong)mcfg;
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header->checksum = table_compute_checksum(mcfg, header->length);
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acpi_add_table(ctx, mcfg);
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return 0;
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}
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ACPI_WRITER(5mcfg, "MCFG", acpi_write_mcfg, 0);
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