arch/x86/lib/e820.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2015, Bin Meng <bmeng.cn@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) */