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