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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Generic code used to generate ACPI tables
- *
- * Copyright 2019 Google LLC
- */
- #include <common.h>
- #include <dm.h>
- #include <cpu.h>
- #include <log.h>
- #include <mapmem.h>
- #include <tables_csum.h>
- #include <version.h>
- #include <acpi/acpi_table.h>
- #include <dm/acpi.h>
- int acpi_create_dmar(struct acpi_dmar *dmar, enum dmar_flags flags)
- {
- struct acpi_table_header *header = &dmar->header;
- struct cpu_info info;
- struct udevice *cpu;
- int ret;
- ret = uclass_first_device(UCLASS_CPU, &cpu);
- if (ret)
- return log_msg_ret("cpu", ret);
- ret = cpu_get_info(cpu, &info);
- if (ret)
- return log_msg_ret("info", ret);
- memset((void *)dmar, 0, sizeof(struct acpi_dmar));
- /* Fill out header fields. */
- acpi_fill_header(&dmar->header, "DMAR");
- header->length = sizeof(struct acpi_dmar);
- header->revision = acpi_get_table_revision(ACPITAB_DMAR);
- dmar->host_address_width = info.address_width - 1;
- dmar->flags = flags;
- return 0;
- }
- int acpi_get_table_revision(enum acpi_tables table)
- {
- switch (table) {
- case ACPITAB_FADT:
- return ACPI_FADT_REV_ACPI_3_0;
- case ACPITAB_MADT:
- return ACPI_MADT_REV_ACPI_3_0;
- case ACPITAB_MCFG:
- return ACPI_MCFG_REV_ACPI_3_0;
- case ACPITAB_TCPA:
- /* This version and the rest are open-coded */
- return 2;
- case ACPITAB_TPM2:
- return 4;
- case ACPITAB_SSDT: /* ACPI 3.0 upto 6.3: 2 */
- return 2;
- case ACPITAB_SRAT: /* ACPI 2.0: 1, ACPI 3.0: 2, ACPI 4.0 to 6.3: 3 */
- return 1; /* TODO Should probably be upgraded to 2 */
- case ACPITAB_DMAR:
- return 1;
- case ACPITAB_SLIT: /* ACPI 2.0 upto 6.3: 1 */
- return 1;
- case ACPITAB_SPMI: /* IMPI 2.0 */
- return 5;
- case ACPITAB_HPET: /* Currently 1. Table added in ACPI 2.0 */
- return 1;
- case ACPITAB_VFCT: /* ACPI 2.0/3.0/4.0: 1 */
- return 1;
- case ACPITAB_IVRS:
- return IVRS_FORMAT_FIXED;
- case ACPITAB_DBG2:
- return 0;
- case ACPITAB_FACS: /* ACPI 2.0/3.0: 1, ACPI 4.0 to 6.3: 2 */
- return 1;
- case ACPITAB_RSDT: /* ACPI 1.0 upto 6.3: 1 */
- return 1;
- case ACPITAB_XSDT: /* ACPI 2.0 upto 6.3: 1 */
- return 1;
- case ACPITAB_RSDP: /* ACPI 2.0 upto 6.3: 2 */
- return 2;
- case ACPITAB_HEST:
- return 1;
- case ACPITAB_NHLT:
- return 5;
- case ACPITAB_BERT:
- return 1;
- case ACPITAB_SPCR:
- return 2;
- default:
- return -EINVAL;
- }
- }
- void acpi_fill_header(struct acpi_table_header *header, char *signature)
- {
- memcpy(header->signature, signature, 4);
- memcpy(header->oem_id, OEM_ID, 6);
- memcpy(header->oem_table_id, OEM_TABLE_ID, 8);
- header->oem_revision = U_BOOT_BUILD_DATE;
- memcpy(header->aslc_id, ASLC_ID, 4);
- }
- void acpi_align(struct acpi_ctx *ctx)
- {
- ctx->current = (void *)ALIGN((ulong)ctx->current, 16);
- }
- void acpi_align64(struct acpi_ctx *ctx)
- {
- ctx->current = (void *)ALIGN((ulong)ctx->current, 64);
- }
- void acpi_inc(struct acpi_ctx *ctx, uint amount)
- {
- ctx->current += amount;
- }
- void acpi_inc_align(struct acpi_ctx *ctx, uint amount)
- {
- ctx->current += amount;
- acpi_align(ctx);
- }
- /**
- * Add an ACPI table to the RSDT (and XSDT) structure, recalculate length
- * and checksum.
- */
- int acpi_add_table(struct acpi_ctx *ctx, void *table)
- {
- int i, entries_num;
- struct acpi_rsdt *rsdt;
- struct acpi_xsdt *xsdt;
- /* The RSDT is mandatory while the XSDT is not */
- rsdt = ctx->rsdt;
- /* This should always be MAX_ACPI_TABLES */
- entries_num = ARRAY_SIZE(rsdt->entry);
- for (i = 0; i < entries_num; i++) {
- if (rsdt->entry[i] == 0)
- break;
- }
- if (i >= entries_num) {
- log_err("ACPI: Error: too many tables\n");
- return -E2BIG;
- }
- /* Add table to the RSDT */
- rsdt->entry[i] = map_to_sysmem(table);
- /* Fix RSDT length or the kernel will assume invalid entries */
- rsdt->header.length = sizeof(struct acpi_table_header) +
- (sizeof(u32) * (i + 1));
- /* Re-calculate checksum */
- rsdt->header.checksum = 0;
- rsdt->header.checksum = table_compute_checksum((u8 *)rsdt,
- rsdt->header.length);
- /*
- * And now the same thing for the XSDT. We use the same index as for
- * now we want the XSDT and RSDT to always be in sync in U-Boot
- */
- xsdt = ctx->xsdt;
- /* Add table to the XSDT */
- xsdt->entry[i] = map_to_sysmem(table);
- /* Fix XSDT length */
- xsdt->header.length = sizeof(struct acpi_table_header) +
- (sizeof(u64) * (i + 1));
- /* Re-calculate checksum */
- xsdt->header.checksum = 0;
- xsdt->header.checksum = table_compute_checksum((u8 *)xsdt,
- xsdt->header.length);
- return 0;
- }
- static void acpi_write_rsdp(struct acpi_rsdp *rsdp, struct acpi_rsdt *rsdt,
- struct acpi_xsdt *xsdt)
- {
- memset(rsdp, 0, sizeof(struct acpi_rsdp));
- memcpy(rsdp->signature, RSDP_SIG, 8);
- memcpy(rsdp->oem_id, OEM_ID, 6);
- rsdp->length = sizeof(struct acpi_rsdp);
- rsdp->rsdt_address = map_to_sysmem(rsdt);
- rsdp->xsdt_address = map_to_sysmem(xsdt);
- rsdp->revision = ACPI_RSDP_REV_ACPI_2_0;
- /* Calculate checksums */
- rsdp->checksum = table_compute_checksum(rsdp, 20);
- rsdp->ext_checksum = table_compute_checksum(rsdp,
- sizeof(struct acpi_rsdp));
- }
- static void acpi_write_rsdt(struct acpi_rsdt *rsdt)
- {
- struct acpi_table_header *header = &rsdt->header;
- /* Fill out header fields */
- acpi_fill_header(header, "RSDT");
- header->length = sizeof(struct acpi_rsdt);
- header->revision = 1;
- /* Entries are filled in later, we come with an empty set */
- /* Fix checksum */
- header->checksum = table_compute_checksum(rsdt,
- sizeof(struct acpi_rsdt));
- }
- static void acpi_write_xsdt(struct acpi_xsdt *xsdt)
- {
- struct acpi_table_header *header = &xsdt->header;
- /* Fill out header fields */
- acpi_fill_header(header, "XSDT");
- header->length = sizeof(struct acpi_xsdt);
- header->revision = 1;
- /* Entries are filled in later, we come with an empty set */
- /* Fix checksum */
- header->checksum = table_compute_checksum(xsdt,
- sizeof(struct acpi_xsdt));
- }
- void acpi_setup_base_tables(struct acpi_ctx *ctx, void *start)
- {
- ctx->base = start;
- ctx->current = start;
- /* Align ACPI tables to 16 byte */
- acpi_align(ctx);
- gd->arch.acpi_start = map_to_sysmem(ctx->current);
- /* We need at least an RSDP and an RSDT Table */
- ctx->rsdp = ctx->current;
- acpi_inc_align(ctx, sizeof(struct acpi_rsdp));
- ctx->rsdt = ctx->current;
- acpi_inc_align(ctx, sizeof(struct acpi_rsdt));
- ctx->xsdt = ctx->current;
- acpi_inc_align(ctx, sizeof(struct acpi_xsdt));
- /* clear all table memory */
- memset((void *)start, '\0', ctx->current - start);
- acpi_write_rsdp(ctx->rsdp, ctx->rsdt, ctx->xsdt);
- acpi_write_rsdt(ctx->rsdt);
- acpi_write_xsdt(ctx->xsdt);
- /*
- * Per ACPI spec, the FACS table address must be aligned to a 64 byte
- * boundary (Windows checks this, but Linux does not).
- */
- acpi_align64(ctx);
- }
- void acpi_create_dbg2(struct acpi_dbg2_header *dbg2,
- int port_type, int port_subtype,
- struct acpi_gen_regaddr *address, u32 address_size,
- const char *device_path)
- {
- uintptr_t current;
- struct acpi_dbg2_device *device;
- u32 *dbg2_addr_size;
- struct acpi_table_header *header;
- size_t path_len;
- const char *path;
- char *namespace;
- /* Fill out header fields. */
- current = (uintptr_t)dbg2;
- memset(dbg2, '\0', sizeof(struct acpi_dbg2_header));
- header = &dbg2->header;
- header->revision = acpi_get_table_revision(ACPITAB_DBG2);
- acpi_fill_header(header, "DBG2");
- header->aslc_revision = ASL_REVISION;
- /* One debug device defined */
- dbg2->devices_offset = sizeof(struct acpi_dbg2_header);
- dbg2->devices_count = 1;
- current += sizeof(struct acpi_dbg2_header);
- /* Device comes after the header */
- device = (struct acpi_dbg2_device *)current;
- memset(device, 0, sizeof(struct acpi_dbg2_device));
- current += sizeof(struct acpi_dbg2_device);
- device->revision = 0;
- device->address_count = 1;
- device->port_type = port_type;
- device->port_subtype = port_subtype;
- /* Base Address comes after device structure */
- memcpy((void *)current, address, sizeof(struct acpi_gen_regaddr));
- device->base_address_offset = current - (uintptr_t)device;
- current += sizeof(struct acpi_gen_regaddr);
- /* Address Size comes after address structure */
- dbg2_addr_size = (uint32_t *)current;
- device->address_size_offset = current - (uintptr_t)device;
- *dbg2_addr_size = address_size;
- current += sizeof(uint32_t);
- /* Namespace string comes last, use '.' if not provided */
- path = device_path ? : ".";
- /* Namespace string length includes NULL terminator */
- path_len = strlen(path) + 1;
- namespace = (char *)current;
- device->namespace_string_length = path_len;
- device->namespace_string_offset = current - (uintptr_t)device;
- strncpy(namespace, path, path_len);
- current += path_len;
- /* Update structure lengths and checksum */
- device->length = current - (uintptr_t)device;
- header->length = current - (uintptr_t)dbg2;
- header->checksum = table_compute_checksum(dbg2, header->length);
- }
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