// SPDX-License-Identifier: GPL-2.0+ /* * Generic code used to generate ACPI tables * * Copyright 2019 Google LLC */ #include #include #include #include #include #include #include #include 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->current = start; /* Align ACPI tables to 16 byte */ acpi_align(ctx); /* 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); }