1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2015, Bin Meng <bmeng.cn (at) gmail.com> 4 */ 5 6 #include <common.h> 7 #include <efi_loader.h> 8 #include <asm/e820.h> 9 10 DECLARE_GLOBAL_DATA_PTR; 11 12 /* 13 * Install a default e820 table with 4 entries as follows: 14 * 15 * 0x000000-0x0a0000 Useable RAM 16 * 0x0a0000-0x100000 Reserved for ISA 17 * 0x100000-gd->ram_size Useable RAM 18 * CONFIG_PCIE_ECAM_BASE PCIe ECAM 19 */ 20 __weak unsigned int install_e820_map(unsigned int max_entries, 21 struct e820_entry *entries) 22 { 23 entries[0].addr = 0; 24 entries[0].size = ISA_START_ADDRESS; 25 entries[0].type = E820_RAM; 26 entries[1].addr = ISA_START_ADDRESS; 27 entries[1].size = ISA_END_ADDRESS - ISA_START_ADDRESS; 28 entries[1].type = E820_RESERVED; 29 entries[2].addr = ISA_END_ADDRESS; 30 entries[2].size = gd->ram_size - ISA_END_ADDRESS; 31 entries[2].type = E820_RAM; 32 entries[3].addr = CONFIG_PCIE_ECAM_BASE; 33 entries[3].size = CONFIG_PCIE_ECAM_SIZE; 34 entries[3].type = E820_RESERVED; 35 36 return 4; 37 } 38 39 #if defined(CONFIG_EFI_LOADER) && !defined(CONFIG_SPL_BUILD) 40 void efi_add_known_memory(void) 41 { 42 struct e820_entry e820[E820MAX]; 43 unsigned int i, num; 44 u64 start, pages; 45 int type; 46 47 num = install_e820_map(ARRAY_SIZE(e820), e820); 48 49 for (i = 0; i < num; ++i) { 50 start = e820[i].addr; 51 pages = ALIGN(e820[i].size, EFI_PAGE_SIZE) >> EFI_PAGE_SHIFT; 52 53 switch (e820[i].type) { 54 case E820_RAM: 55 type = EFI_CONVENTIONAL_MEMORY; 56 break; 57 case E820_RESERVED: 58 type = EFI_RESERVED_MEMORY_TYPE; 59 break; 60 case E820_ACPI: 61 type = EFI_ACPI_RECLAIM_MEMORY; 62 break; 63 case E820_NVS: 64 type = EFI_ACPI_MEMORY_NVS; 65 break; 66 case E820_UNUSABLE: 67 default: 68 type = EFI_UNUSABLE_MEMORY; 69 break; 70 } 71 72 efi_add_memory_map(start, pages, type, false); 73 } 74 } 75 #endif /* defined(EFI_LOADER) && !defined(CONFIG_SPL_BUILD) */ 76
