arch/x86/lib/e820.c

   1 /*
   2  * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.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 install_e820_map(unsigned max_entries,
  21                                  struct e820entry *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 }