/* SPDX-License-Identifier: GPL-2.0-only */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static unsigned long gen_crat_hsa_entry(struct acpi_crat_header *crat, unsigned long current) { struct crat_hsa_processing_unit *hsa_entry = (struct crat_hsa_processing_unit *)current; memset(hsa_entry, 0, sizeof(struct crat_hsa_processing_unit)); hsa_entry->flags = CRAT_HSA_PR_FLAG_EN | CRAT_HSA_PR_FLAG_CPU_PRES; hsa_entry->wave_front_size = 4; hsa_entry->num_cpu_cores = get_cpu_count(); hsa_entry->length = sizeof(struct crat_hsa_processing_unit); crat->total_entries++; current += hsa_entry->length; return current; } static unsigned long create_crat_memory_entry(uint32_t domain, uint64_t region_base, uint64_t region_size, unsigned long current) { struct crat_memory *mem_affinity = (struct crat_memory *)current; memset(mem_affinity, 0, sizeof(struct crat_memory)); mem_affinity->type = CRAT_MEMORY_TYPE; mem_affinity->length = sizeof(struct crat_memory); mem_affinity->proximity_domain = 0; mem_affinity->base_address_low = region_base & 0xffffffff; mem_affinity->base_address_high = (region_base >> 32) & 0xffffffff; mem_affinity->length_low = region_size & 0xffffffff; mem_affinity->length_high = (region_size >> 32) & 0xffffffff; mem_affinity->flags = CRAT_MEM_FLAG_EN; mem_affinity->width = 64; current += mem_affinity->length; return current; } static unsigned long gen_crat_memory_entries(struct acpi_crat_header *crat, unsigned long current) { uint32_t dram_base_reg, dram_limit_reg, dram_hole_ctl; uint64_t memory_length, memory_base, hole_base, size_below_hole; size_t new_entries = 0; for (size_t dram_map_idx = 0; dram_map_idx < PICASSO_NUM_DRAM_REG; dram_map_idx++) { dram_base_reg = data_fabric_read32(0, DF_DRAM_BASE(dram_map_idx), IOMS0_FABRIC_ID); if (dram_base_reg & DRAM_BASE_REG_VALID) { dram_limit_reg = data_fabric_read32(0, DF_DRAM_LIMIT(dram_map_idx), IOMS0_FABRIC_ID); memory_length = ((dram_limit_reg & DRAM_LIMIT_ADDR) >> DRAM_LIMIT_ADDR_SHFT) + 1 - ((dram_base_reg & DRAM_BASE_ADDR) >> DRAM_BASE_ADDR_SHFT); memory_length = memory_length << 28; memory_base = (uint64_t)(dram_base_reg & DRAM_BASE_ADDR) << (28 - DRAM_BASE_ADDR_SHFT); if (memory_base == 0) { current = create_crat_memory_entry(0, 0ull, 0xa0000ull, current); memory_base = (1 * 1024 * 1024); memory_length = memory_base; new_entries++; } if (dram_base_reg & DRAM_BASE_HOLE_EN) { dram_hole_ctl = data_fabric_read32(0, D18F0_DRAM_HOLE_CTL, IOMS0_FABRIC_ID); hole_base = (dram_hole_ctl & DRAM_HOLE_CTL_BASE); size_below_hole = hole_base - memory_base; current = create_crat_memory_entry(0, memory_base, size_below_hole, current); memory_length = (uint64_t)(((dram_limit_reg & DRAM_LIMIT_ADDR) >> DRAM_LIMIT_ADDR_SHFT) + 1 - 0x10) << 28; memory_base = 0x100000000; new_entries++; } current = create_crat_memory_entry(0, memory_base, memory_length, current); new_entries++; } } crat->total_entries += new_entries; return current; } static unsigned long add_crat_cache_entry(struct crat_cache **cache_affinity, unsigned long current) { *cache_affinity = (struct crat_cache *)current; memset(*cache_affinity, 0, sizeof(struct crat_cache)); (*cache_affinity)->type = CRAT_CACHE_TYPE; (*cache_affinity)->length = sizeof(struct crat_cache); (*cache_affinity)->flags = CRAT_CACHE_FLAG_EN | CRAT_CACHE_FLAG_CPU_CACHE; current += sizeof(struct crat_cache); return current; } static uint8_t get_associativity(uint32_t encoded_associativity) { uint8_t associativity = 0; switch (encoded_associativity) { case 0: case 1: case 2: case 3: case 4: return encoded_associativity; case 5: associativity = 6; break; case 6: associativity = 8; break; case 8: associativity = 16; break; case 0xA: associativity = 32; break; case 0xB: associativity = 48; break; case 0xC: associativity = 64; break; case 0xD: associativity = 96; break; case 0xE: associativity = 128; break; case 0xF: associativity = 0xFF; break; default: return 0; } return associativity; } static unsigned long gen_crat_cache_entry(struct acpi_crat_header *crat, unsigned long current) { size_t total_num_threads, num_threads_sharing0, num_threads_sharing1, num_threads_sharing2, num_threads_sharing3, thread, new_entries; struct cpuid_result cache_props0, cache_props1, cache_props2, cache_props3; uint8_t sibling_mask = 0; uint32_t l1_data_cache_ids, l1_inst_cache_ids, l2_cache_ids, l3_cache_ids; struct crat_cache *cache_affinity = NULL; total_num_threads = get_cpu_count(); cache_props0 = cpuid_ext(CPUID_CACHE_PROPS, CACHE_PROPS_0); cache_props1 = cpuid_ext(CPUID_CACHE_PROPS, CACHE_PROPS_1); cache_props2 = cpuid_ext(CPUID_CACHE_PROPS, CACHE_PROPS_2); cache_props3 = cpuid_ext(CPUID_CACHE_PROPS, CACHE_PROPS_3); l1_data_cache_ids = cpuid_ecx(CPUID_L1_TLB_CACHE_IDS); l1_inst_cache_ids = cpuid_edx(CPUID_L1_TLB_CACHE_IDS); l2_cache_ids = cpuid_ecx(CPUID_L2_L3_CACHE_L2_TLB_IDS); l3_cache_ids = cpuid_edx(CPUID_L2_L3_CACHE_L2_TLB_IDS); num_threads_sharing0 = ((cache_props0.eax & NUM_SHARE_CACHE_MASK) >> NUM_SHARE_CACHE_SHFT) + 1; num_threads_sharing1 = ((cache_props1.eax & NUM_SHARE_CACHE_MASK) >> NUM_SHARE_CACHE_SHFT) + 1; num_threads_sharing2 = ((cache_props2.eax & NUM_SHARE_CACHE_MASK) >> NUM_SHARE_CACHE_SHFT) + 1; num_threads_sharing3 = ((cache_props3.eax & NUM_SHARE_CACHE_MASK) >> NUM_SHARE_CACHE_SHFT) + 1; new_entries = 0; for (thread = 0; thread < total_num_threads; thread++) { /* L1 data cache */ if (thread % num_threads_sharing0 == 0) { current = add_crat_cache_entry(&cache_affinity, current); new_entries++; cache_affinity->flags |= CRAT_CACHE_FLAG_DATA_CACHE; cache_affinity->proc_id_low = thread; sibling_mask = 1; for (size_t sibling = 1; sibling < num_threads_sharing0; sibling++) sibling_mask = (sibling_mask << 1) + 1; cache_affinity->sibling_map[thread / 8] = sibling_mask << (thread % 8); cache_affinity->cache_properties = (cache_props0.edx & CACHE_INCLUSIVE_MASK) ? 2 : 0; cache_affinity->cache_size = (l1_data_cache_ids & L1_DC_SIZE_MASK) >> L1_DC_SIZE_SHFT; cache_affinity->cache_level = CRAT_L1_CACHE; cache_affinity->lines_per_tag = (l1_data_cache_ids & L1_DC_LINE_TAG_MASK) >> L1_DC_LINE_TAG_SHFT; cache_affinity->cache_line_size = (l1_data_cache_ids & L1_DC_LINE_SIZE_MASK) >> L1_DC_LINE_SIZE_SHFT; cache_affinity->associativity = (l1_data_cache_ids & L1_DC_ASSOC_MASK) >> L1_DC_ASSOC_SHFT; cache_affinity->cache_latency = 1; } /* L1 instruction cache */ if (thread % num_threads_sharing1 == 0) { current = add_crat_cache_entry(&cache_affinity, current); new_entries++; cache_affinity->flags |= CRAT_CACHE_FLAG_INSTR_CACHE; cache_affinity->proc_id_low = thread; sibling_mask = 1; for (size_t sibling = 1; sibling < num_threads_sharing1; sibling++) sibling_mask = (sibling_mask << 1) + 1; cache_affinity->sibling_map[thread / 8] = sibling_mask << (thread % 8); cache_affinity->cache_properties = (cache_props1.edx & CACHE_INCLUSIVE_MASK) ? 2 : 0; cache_affinity->cache_size = (l1_inst_cache_ids & L1_IC_SIZE_MASK) >> L1_IC_SIZE_SHFT; cache_affinity->cache_level = CRAT_L1_CACHE; cache_affinity->lines_per_tag = (l1_inst_cache_ids & L1_IC_LINE_TAG_MASK) >> L1_IC_LINE_TAG_SHFT; cache_affinity->cache_line_size = (l1_inst_cache_ids & L1_IC_LINE_SIZE_MASK) >> L1_IC_LINE_SIZE_SHFT; cache_affinity->associativity = (l1_inst_cache_ids & L1_IC_ASSOC_MASK) >> L1_IC_ASSOC_SHFT; cache_affinity->cache_latency = 1; } /* L2 cache */ if (thread % num_threads_sharing2 == 0) { current = add_crat_cache_entry(&cache_affinity, current); new_entries++; cache_affinity->flags |= CRAT_CACHE_FLAG_DATA_CACHE | CRAT_CACHE_FLAG_INSTR_CACHE; cache_affinity->proc_id_low = thread; sibling_mask = 1; for (size_t sibling = 1; sibling < num_threads_sharing2; sibling++) sibling_mask = (sibling_mask << 1) + 1; cache_affinity->sibling_map[thread / 8] = sibling_mask << (thread % 8); cache_affinity->cache_properties = (cache_props2.edx & CACHE_INCLUSIVE_MASK) ? 2 : 0; cache_affinity->cache_size = (l2_cache_ids & L2_DC_SIZE_MASK) >> L2_DC_SIZE_SHFT; cache_affinity->cache_level = CRAT_L2_CACHE; cache_affinity->lines_per_tag = (l2_cache_ids & L2_DC_LINE_TAG_MASK) >> L2_DC_LINE_TAG_SHFT; cache_affinity->cache_line_size = (l2_cache_ids & L2_DC_LINE_SIZE_MASK) >> L2_DC_LINE_SIZE_SHFT; cache_affinity->associativity = get_associativity( (l2_cache_ids & L2_DC_ASSOC_MASK) >> L2_DC_ASSOC_SHFT); cache_affinity->cache_latency = 1; } /* L3 cache */ if (thread % num_threads_sharing3 == 0) { current = add_crat_cache_entry(&cache_affinity, current); new_entries++; cache_affinity->flags |= CRAT_CACHE_FLAG_DATA_CACHE | CRAT_CACHE_FLAG_INSTR_CACHE; cache_affinity->proc_id_low = thread; sibling_mask = 1; for (size_t sibling = 1; sibling < num_threads_sharing3; sibling++) sibling_mask = (sibling_mask << 1) + 1; cache_affinity->sibling_map[thread / 8] = sibling_mask << (thread % 8); cache_affinity->cache_properties = (cache_props0.edx & CACHE_INCLUSIVE_MASK) ? 2 : 0; cache_affinity->cache_size = ((l3_cache_ids & L3_DC_SIZE_MASK) >> L3_DC_SIZE_SHFT) * 512; cache_affinity->cache_level = CRAT_L3_CACHE; cache_affinity->lines_per_tag = (l3_cache_ids & L3_DC_LINE_TAG_MASK) >> L3_DC_LINE_TAG_SHFT; cache_affinity->cache_line_size = (l3_cache_ids & L3_DC_LINE_SIZE_MASK) >> L3_DC_LINE_SIZE_SHFT; cache_affinity->associativity = get_associativity( (l3_cache_ids & L3_DC_ASSOC_MASK) >> L3_DC_ASSOC_SHFT); cache_affinity->cache_latency = 1; } } crat->total_entries += new_entries; return current; } static uint8_t get_tlb_size(enum tlb_type type, struct crat_tlb *crat_tlb_entry, uint16_t raw_assoc_size) { uint8_t tlbsize; if (raw_assoc_size >= 256) { tlbsize = (uint8_t)(raw_assoc_size / 256); if (type == tlb_2m) crat_tlb_entry->flags |= CRAT_TLB_FLAG_2MB_BASE_256; else if (type == tlb_4k) crat_tlb_entry->flags |= CRAT_TLB_FLAG_4K_BASE_256; else if (type == tlb_1g) crat_tlb_entry->flags |= CRAT_TLB_FLAG_1GB_BASE_256; } else { tlbsize = (uint8_t)(raw_assoc_size); } return tlbsize; } static unsigned long add_crat_tlb_entry(struct crat_tlb **tlb_affinity, unsigned long current) { *tlb_affinity = (struct crat_tlb *)current; memset(*tlb_affinity, 0, sizeof(struct crat_tlb)); (*tlb_affinity)->type = CRAT_TLB_TYPE; (*tlb_affinity)->length = sizeof(struct crat_tlb); (*tlb_affinity)->flags = CRAT_TLB_FLAG_EN | CRAT_TLB_FLAG_CPU_TLB; current += sizeof(struct crat_tlb); return current; } static unsigned long gen_crat_tlb_entry(struct acpi_crat_header *crat, unsigned long current) { size_t total_num_threads, num_threads_sharing0, num_threads_sharing1, num_threads_sharing2, thread, new_entries; struct cpuid_result cache_props0, cache_props1, cache_props2; uint8_t sibling_mask = 0; uint32_t l1_tlb_2M4M_ids, l1_tlb_4K_ids, l2_tlb_2M4M_ids, l2_tlb_4K_ids, l1_tlb_1G_ids, l2_tlb_1G_ids; struct crat_tlb *tlb_affinity = NULL; total_num_threads = get_cpu_count(); cache_props0 = cpuid_ext(CPUID_CACHE_PROPS, CACHE_PROPS_0); cache_props1 = cpuid_ext(CPUID_CACHE_PROPS, CACHE_PROPS_1); cache_props2 = cpuid_ext(CPUID_CACHE_PROPS, CACHE_PROPS_2); l1_tlb_2M4M_ids = cpuid_eax(CPUID_L1_TLB_CACHE_IDS); l2_tlb_2M4M_ids = cpuid_eax(CPUID_L2_L3_CACHE_L2_TLB_IDS); l1_tlb_4K_ids = cpuid_ebx(CPUID_L1_TLB_CACHE_IDS); l2_tlb_4K_ids = cpuid_ebx(CPUID_L2_L3_CACHE_L2_TLB_IDS); l1_tlb_1G_ids = cpuid_eax(CPUID_TLB_L1L2_1G_IDS); l2_tlb_1G_ids = cpuid_ebx(CPUID_TLB_L1L2_1G_IDS); num_threads_sharing0 = ((cache_props0.eax & NUM_SHARE_CACHE_MASK) >> NUM_SHARE_CACHE_SHFT) + 1; num_threads_sharing1 = ((cache_props1.eax & NUM_SHARE_CACHE_MASK) >> NUM_SHARE_CACHE_SHFT) + 1; num_threads_sharing2 = ((cache_props2.eax & NUM_SHARE_CACHE_MASK) >> NUM_SHARE_CACHE_SHFT) + 1; new_entries = 0; for (thread = 0; thread < total_num_threads; thread++) { /* L1 data TLB */ if (thread % num_threads_sharing0 == 0) { current = add_crat_tlb_entry(&tlb_affinity, current); new_entries++; tlb_affinity->flags |= CRAT_TLB_FLAG_DATA_TLB; tlb_affinity->proc_id_low = thread; sibling_mask = 1; for (size_t sibling = 1; sibling < num_threads_sharing0; sibling++) sibling_mask = (sibling_mask << 1) + 1; tlb_affinity->sibling_map[thread / 8] = sibling_mask << (thread % 8); tlb_affinity->tlb_level = CRAT_L1_CACHE; tlb_affinity->data_tlb_2mb_assoc = (l1_tlb_2M4M_ids & L1_DAT_TLB_2M4M_ASSOC_MASK) >> L1_DAT_TLB_2M4M_ASSOC_SHFT; tlb_affinity->data_tlb_2mb_size = get_tlb_size(tlb_2m, tlb_affinity, (l1_tlb_2M4M_ids & L1_DAT_TLB_2M4M_SIZE_MASK) >> L1_DAT_TLB_2M4M_SIZE_SHFT); tlb_affinity->data_tlb_4k_assoc = (l1_tlb_4K_ids & L1_DAT_TLB_4K_ASSOC_MASK) >> L1_DAT_TLB_4K_ASSOC_SHFT; tlb_affinity->data_tlb_4k_size = get_tlb_size(tlb_4k, tlb_affinity, (l1_tlb_4K_ids & L1_DAT_TLB_4K_SIZE_MASK) >> L1_DAT_TLB_4K_SIZE_SHFT); tlb_affinity->data_tlb_1g_assoc = (l1_tlb_1G_ids & L1_DAT_TLB_1G_ASSOC_MASK) >> L1_DAT_TLB_1G_ASSOC_SHFT; tlb_affinity->data_tlb_1g_size = get_tlb_size(tlb_1g, tlb_affinity, (l1_tlb_1G_ids & L1_DAT_TLB_1G_SIZE_MASK) >> L1_DAT_TLB_1G_SIZE_SHFT); } /* L1 instruction TLB */ if (thread % num_threads_sharing1 == 0) { current = add_crat_tlb_entry(&tlb_affinity, current); new_entries++; tlb_affinity->flags |= CRAT_TLB_FLAG_INSTR_TLB; tlb_affinity->proc_id_low = thread; sibling_mask = 1; for (size_t sibling = 1; sibling < num_threads_sharing1; sibling++) sibling_mask = (sibling_mask << 1) + 1; tlb_affinity->sibling_map[thread / 8] = sibling_mask << (thread % 8); tlb_affinity->tlb_level = CRAT_L1_CACHE; tlb_affinity->instr_tlb_2mb_assoc = (l1_tlb_2M4M_ids & L1_INST_TLB_2M4M_ASSOC_MASK) >> L1_INST_TLB_2M4M_ASSOC_SHFT; tlb_affinity->instr_tlb_2mb_size = get_tlb_size(tlb_2m, tlb_affinity, (l1_tlb_2M4M_ids & L1_INST_TLB_2M4M_SIZE_MASK) >> L1_INST_TLB_2M4M_SIZE_SHFT); tlb_affinity->instr_tlb_4k_assoc = (l1_tlb_4K_ids & L1_INST_TLB_4K_ASSOC_MASK) >> L1_INST_TLB_4K_ASSOC_SHFT; tlb_affinity->instr_tlb_4k_size = get_tlb_size(tlb_4k, tlb_affinity, (l1_tlb_4K_ids & L1_INST_TLB_4K_SIZE_MASK) >> L1_INST_TLB_4K_SIZE_SHFT); tlb_affinity->instr_tlb_1g_assoc = (l1_tlb_1G_ids & L1_INST_TLB_1G_ASSOC_MASK) >> L1_INST_TLB_1G_ASSOC_SHFT; tlb_affinity->instr_tlb_1g_size = get_tlb_size(tlb_1g, tlb_affinity, (l1_tlb_1G_ids & L1_INST_TLB_1G_SIZE_MASK) >> L1_INST_TLB_1G_SIZE_SHFT); } /* L2 Data TLB */ if (thread % num_threads_sharing2 == 0) { current = add_crat_tlb_entry(&tlb_affinity, current); new_entries++; tlb_affinity->flags |= CRAT_TLB_FLAG_DATA_TLB; tlb_affinity->proc_id_low = thread; sibling_mask = 1; for (size_t sibling = 1; sibling < num_threads_sharing2; sibling++) sibling_mask = (sibling_mask << 1) + 1; tlb_affinity->sibling_map[thread / 8] = sibling_mask << (thread % 8); tlb_affinity->tlb_level = CRAT_L2_CACHE; tlb_affinity->data_tlb_2mb_assoc = (l2_tlb_2M4M_ids & L2_DAT_TLB_2M4M_ASSOC_MASK) >> L2_DAT_TLB_2M4M_ASSOC_SHFT; tlb_affinity->data_tlb_2mb_size = get_tlb_size(tlb_2m, tlb_affinity, (l2_tlb_2M4M_ids & L2_DAT_TLB_2M4M_SIZE_MASK) >> L2_DAT_TLB_2M4M_SIZE_SHFT); tlb_affinity->data_tlb_4k_assoc = get_associativity((l2_tlb_4K_ids & L2_DAT_TLB_2M4M_ASSOC_MASK) >> L2_DAT_TLB_4K_ASSOC_SHFT); tlb_affinity->data_tlb_4k_size = get_tlb_size(tlb_4k, tlb_affinity, (l2_tlb_2M4M_ids & L2_DAT_TLB_4K_SIZE_MASK) >> L2_DAT_TLB_4K_SIZE_SHFT); tlb_affinity->data_tlb_1g_assoc = get_associativity((l2_tlb_1G_ids & L2_DAT_TLB_1G_ASSOC_MASK) >> L2_DAT_TLB_1G_ASSOC_SHFT); tlb_affinity->data_tlb_1g_size = get_tlb_size(tlb_1g, tlb_affinity, (l2_tlb_1G_ids & L2_DAT_TLB_1G_SIZE_MASK) >> L2_DAT_TLB_1G_SIZE_SHFT); } /* L2 Instruction TLB */ if (thread % num_threads_sharing2 == 0) { current = add_crat_tlb_entry(&tlb_affinity, current); new_entries++; tlb_affinity->flags |= CRAT_TLB_FLAG_INSTR_TLB; tlb_affinity->proc_id_low = thread; sibling_mask = 1; for (size_t sibling = 1; sibling < num_threads_sharing2; sibling++) sibling_mask = (sibling_mask << 1) + 1; tlb_affinity->sibling_map[thread / 8] = sibling_mask << (thread % 8); tlb_affinity->tlb_level = CRAT_L2_CACHE; tlb_affinity->instr_tlb_2mb_assoc = get_associativity( (l2_tlb_2M4M_ids & L2_INST_TLB_2M4M_ASSOC_MASK) >> L2_INST_TLB_2M4M_ASSOC_SHFT); tlb_affinity->instr_tlb_2mb_size = get_tlb_size(tlb_2m, tlb_affinity, (l2_tlb_2M4M_ids & L2_INST_TLB_2M4M_SIZE_MASK) >> L2_INST_TLB_2M4M_SIZE_SHFT); tlb_affinity->instr_tlb_4k_assoc = get_associativity((l2_tlb_4K_ids & L2_INST_TLB_4K_ASSOC_MASK) >> L2_INST_TLB_4K_ASSOC_SHFT); tlb_affinity->instr_tlb_4k_size = get_tlb_size(tlb_4k, tlb_affinity, (l2_tlb_4K_ids & L2_INST_TLB_4K_SIZE_MASK) >> L2_INST_TLB_4K_SIZE_SHFT); tlb_affinity->instr_tlb_1g_assoc = get_associativity((l2_tlb_1G_ids & L2_INST_TLB_1G_ASSOC_MASK) >> L2_INST_TLB_1G_ASSOC_SHFT); tlb_affinity->instr_tlb_1g_size = get_tlb_size(tlb_1g, tlb_affinity, (l2_tlb_1G_ids & L2_INST_TLB_1G_SIZE_MASK) >> L2_INST_TLB_1G_SIZE_SHFT); } } crat->total_entries += new_entries; return current; } static unsigned long acpi_fill_crat(struct acpi_crat_header *crat, unsigned long current) { current = gen_crat_hsa_entry(crat, current); current = gen_crat_memory_entries(crat, current); current = gen_crat_cache_entry(crat, current); current = gen_crat_tlb_entry(crat, current); crat->num_nodes++; return current; } uintptr_t agesa_write_acpi_tables(const struct device *device, uintptr_t current, acpi_rsdp_t *rsdp) { acpi_ivrs_t *ivrs; struct acpi_crat_header *crat; /* CRAT */ current = ALIGN(current, 8); crat = (struct acpi_crat_header *)current; acpi_create_crat(crat, acpi_fill_crat); current += crat->header.length; acpi_add_table(rsdp, crat); /* add ALIB SSDT from HOB */ current = add_agesa_fsp_acpi_table(AMD_FSP_ACPI_ALIB_HOB_GUID, "ALIB", rsdp, current); /* IVRS */ current = ALIGN(current, 8); ivrs = (acpi_ivrs_t *) current; acpi_create_ivrs(ivrs, acpi_fill_ivrs); current += ivrs->header.length; acpi_add_table(rsdp, ivrs); /* Add SRAT, MSCT, SLIT if needed in the future */ return current; }