/* This file is part of the coreboot project. */ /* SPDX-License-Identifier: GPL-2.0-or-later */ #include #include #include #include #include #include #include #include #include #include struct map_entry { uint32_t reg; int is_64_bit; int is_limit; int mask_bits; const char *description; }; enum { TOHM_REG, MMIOL_REG, MMCFG_BASE_REG, MMCFG_LIMIT_REG, TOLM_REG, ME_BASE_REG, ME_LIMIT_REG, TSEG_BASE_REG, TSEG_LIMIT_REG, /* Must be last. */ NUM_MAP_ENTRIES }; static struct map_entry memory_map[NUM_MAP_ENTRIES] = { [TOHM_REG] = MAP_ENTRY_LIMIT_64(VTD_TOHM_CSR, 26, "TOHM"), [MMIOL_REG] = MAP_ENTRY_BASE_32(VTD_MMIOL_CSR, "MMIOL"), [MMCFG_BASE_REG] = MAP_ENTRY_BASE_64(VTD_MMCFG_BASE_CSR, "MMCFG_BASE"), [MMCFG_LIMIT_REG] = MAP_ENTRY_LIMIT_64(VTD_MMCFG_LIMIT_CSR, 26, "MMCFG_LIMIT"), [TOLM_REG] = MAP_ENTRY_LIMIT_32(VTD_TOLM_CSR, 26, "TOLM"), [ME_BASE_REG] = MAP_ENTRY_BASE_64(VTD_ME_BASE_CSR, "ME_BASE"), [ME_LIMIT_REG] = MAP_ENTRY_LIMIT_64(VTD_ME_LIMIT_CSR, 19, "ME_LIMIT"), [TSEG_BASE_REG] = MAP_ENTRY_BASE_32(VTD_TSEG_BASE_CSR, "TSEGMB_BASE"), [TSEG_LIMIT_REG] = MAP_ENTRY_LIMIT_32(VTD_TSEG_LIMIT_CSR, 20, "TSEGMB_LIMIT"), }; static void read_map_entry(struct device *dev, struct map_entry *entry, uint64_t *result) { uint64_t value; uint64_t mask; /* All registers are on a 1MiB granularity. */ mask = ((1ULL << entry->mask_bits) - 1); mask = ~mask; value = 0; if (entry->is_64_bit) { value = pci_read_config32(dev, entry->reg + sizeof(uint32_t)); value <<= 32; } value |= (uint64_t)pci_read_config32(dev, entry->reg); value &= mask; if (entry->is_limit) value |= ~mask; *result = value; } static void mc_read_map_entries(struct device *dev, uint64_t *values) { int i; for (i = 0; i < NUM_MAP_ENTRIES; i++) read_map_entry(dev, &memory_map[i], &values[i]); } static void mc_report_map_entries(struct device *dev, uint64_t *values) { int i; for (i = 0; i < NUM_MAP_ENTRIES; i++) { printk(BIOS_DEBUG, "MC MAP: %s: 0x%llx\n", memory_map[i].description, values[i]); } } /* * Host Memory Map: * * +--------------------------+ TOCM (2 pow 46 - 1) * | Reserved | * +--------------------------+ * | MMIOH (relocatable) | * +--------------------------+ * | PCISeg | * +--------------------------+ TOHM * | High DRAM Memory | * +--------------------------+ 4GiB (0x100000000) * +--------------------------+ 0xFFFF_FFFF * | Firmware | * +--------------------------+ 0xFF00_0000 * | Reserved | * +--------------------------+ 0xFEF0_0000 * | Local xAPIC | * +--------------------------+ 0xFEE0_0000 * | HPET/LT/TPM/Others | * +--------------------------+ 0xFED0_0000 * | I/O xAPIC | * +--------------------------+ 0xFEC0_0000 * | Reserved | * +--------------------------+ 0xFEB8_0000 * | Reserved | * +--------------------------+ 0xFEB0_0000 * | Reserved | * +--------------------------+ 0xFE00_0000 * | MMIOL (relocatable) | * | P2SB PCR cfg BAR | (0xfd000000 - 0xfdffffff * | BAR space | [mem 0x90000000-0xfcffffff] available for PCI devices * +--------------------------+ 0x9000_0000 * |PCIe MMCFG (relocatable) | CONFIG_MMCONF_BASE_ADDRESS 64 or 256MB * | | (0x80000000 - 0x8fffffff, 0x40000) * +--------------------------+ TOLM * | MEseg (relocatable) | 32, 64, 128 or 256 MB (0x78000000 - 0x7fffffff, 0x20000) * +--------------------------+ * | Tseg (relocatable) | N x 8MB (0x70000000 - 0x77ffffff, 0x20000) * +--------------------------+ cbmem_top * | Reserved - CBMEM | (0x6fffe000 - 0x6fffffff, 0x2000) * +--------------------------+ * | Reserved - FSP | (0x6fbfe000 - 0x6fffdfff, 0x400000) * +--------------------------+ top_of_ram (0x6fbfdfff) * | Low DRAM Memory | * +--------------------------+ FFFFF (1MB) * | E & F segments | * +--------------------------+ E0000 * | C & D segments | * +--------------------------+ C0000 * | VGA & SMM Memory | * +--------------------------+ A0000 * | Conventional Memory | * | (DOS Range) | * +--------------------------+ 0 */ static void mc_add_dram_resources(struct device *dev, int *res_count) { struct range_entry fsp_mem; uint64_t base_kb; uint64_t size_kb; uint64_t top_of_ram; uint64_t mc_values[NUM_MAP_ENTRIES]; struct resource *resource; int index = *res_count; fsp_find_reserved_memory(&fsp_mem); /* Read in the MAP registers and report their values. */ mc_read_map_entries(dev, &mc_values[0]); mc_report_map_entries(dev, &mc_values[0]); top_of_ram = range_entry_base(&fsp_mem) - 1; printk(BIOS_SPEW, "cbmem_top: 0x%lx, fsp range: [0x%llx - 0x%llx], top_of_ram: 0x%llx\n", (uintptr_t) cbmem_top(), range_entry_base(&fsp_mem), range_entry_end(&fsp_mem), top_of_ram); /* Conventional Memory (DOS region, 0x0 to 0x9FFFF) */ base_kb = 0; size_kb = (0xa0000 >> 10); LOG_MEM_RESOURCE("legacy_ram", dev, index, base_kb, size_kb); ram_resource(dev, index++, base_kb, size_kb); /* 1MB -> top_of_ram i.e., fsp_mem_base+1*/ base_kb = (0x100000 >> 10); size_kb = (top_of_ram - 0xfffff) >> 10; LOG_MEM_RESOURCE("low_ram", dev, index, base_kb, size_kb); ram_resource(dev, index++, base_kb, size_kb); /* * FSP meomoy, CBMem regions are already added as reserved * Add TSEG and MESEG Regions as reserved memory * src/drivers/intel/fsp2_0/memory_init.c sets CBMEM reserved size * arch_upd->BootLoaderTolumSize = cbmem_overhead_size(); == 2 * CBMEM_ROOT_MIN_SIZE * typically 0x2000 * Example config: * FSP_RESERVED_MEMORY_RESOURCE_HOB * FspReservedMemoryResource Base : 6FBFE000 * FspReservedMemoryResource Size : 400000 * FSP_BOOT_LOADER_TOLUM_HOB * FspBootLoaderTolum Base : 6FFFE000 * FspBootLoaderTolum Size : 2000 */ /* Mark TSEG/SMM region as reserved */ base_kb = (mc_values[TSEG_BASE_REG] >> 10); size_kb = (mc_values[TSEG_LIMIT_REG] - mc_values[TSEG_BASE_REG] + 1) >> 10; LOG_MEM_RESOURCE("mmio_tseg", dev, index, base_kb, size_kb); reserved_ram_resource(dev, index++, base_kb, size_kb); /* Mark region between TSEG - TOLM (eg. MESEG) as reserved */ if (mc_values[TSEG_LIMIT_REG] < mc_values[TOLM_REG]) { base_kb = ((mc_values[TSEG_LIMIT_REG] + 1) >> 10); size_kb = (mc_values[TOLM_REG] - mc_values[TSEG_LIMIT_REG]) >> 10; LOG_MEM_RESOURCE("mmio_tolm", dev, index, base_kb, size_kb); reserved_ram_resource(dev, index++, base_kb, size_kb); } /* 4GiB -> TOHM */ if (mc_values[TOHM_REG] > 0x100000000) { base_kb = (0x100000000 >> 10); size_kb = (mc_values[TOHM_REG] - 0x100000000 + 1) >> 10; LOG_MEM_RESOURCE("high_ram", dev, index, base_kb, size_kb); ram_resource(dev, index++, base_kb, size_kb); } /* add MMIO CFG resource */ resource = new_resource(dev, index++); resource->base = (resource_t) mc_values[MMCFG_BASE_REG]; resource->size = (resource_t) (mc_values[MMCFG_LIMIT_REG] - mc_values[MMCFG_BASE_REG] + 1); resource->flags = IORESOURCE_MEM | IORESOURCE_RESERVE | IORESOURCE_FIXED | IORESOURCE_STORED | IORESOURCE_ASSIGNED; LOG_MEM_RESOURCE("mmiocfg_res", dev, index-1, (resource->base >> 10), (resource->size >> 10)); /* add Local APIC resource */ resource = new_resource(dev, index++); resource->base = LAPIC_DEFAULT_BASE; resource->size = 0x00001000; resource->flags = IORESOURCE_MEM | IORESOURCE_RESERVE | IORESOURCE_FIXED | IORESOURCE_STORED | IORESOURCE_ASSIGNED; LOG_MEM_RESOURCE("apic_res", dev, index-1, (resource->base >> 10), (resource->size >> 10)); /* * Add legacy region as reserved - 0xa000 - 1MB * Reserve everything between A segment and 1MB: * * 0xa0000 - 0xbffff: legacy VGA * 0xc0000 - 0xfffff: RAM */ base_kb = VGA_BASE_ADDRESS >> 10; size_kb = VGA_BASE_SIZE >> 10; LOG_MEM_RESOURCE("legacy_mmio", dev, index, base_kb, size_kb); mmio_resource(dev, index++, base_kb, size_kb); base_kb = (0xc0000 >> 10); size_kb = (0x100000 - 0xc0000) >> 10; LOG_MEM_RESOURCE("legacy_write_protect", dev, index, base_kb, size_kb); reserved_ram_resource(dev, index++, base_kb, size_kb); *res_count = index; } static void mmapvtd_read_resources(struct device *dev) { int index = 0; /* Read standard PCI resources. */ pci_dev_read_resources(dev); /* Calculate and add DRAM resources. */ mc_add_dram_resources(dev, &index); } static void mmapvtd_init(struct device *dev) { } static struct device_operations mmapvtd_ops = { .read_resources = mmapvtd_read_resources, .set_resources = pci_dev_set_resources, .enable_resources = pci_dev_enable_resources, .init = mmapvtd_init, .ops_pci = &soc_pci_ops, }; static const unsigned short mmapvtd_ids[] = { MMAP_VTD_CFG_REG_DEVID, /* Memory Map/Intel® VT-d Configuration Registers */ 0 }; static const struct pci_driver mmapvtd_driver __pci_driver = { .ops = &mmapvtd_ops, .vendor = PCI_VENDOR_ID_INTEL, .devices = mmapvtd_ids };