arch/x86/cpu/qemu/e820.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2015 Miao Yan <yanmiaobest@gmail.com>
   4  */
   5
   6 #include <common.h>
   7 #include <asm/e820.h>
   8
   9 DECLARE_GLOBAL_DATA_PTR;
  10
  11 unsigned int install_e820_map(unsigned int max_entries,
  12                               struct e820_entry *entries)
  13 {
  14         entries[0].addr = 0;
  15         entries[0].size = ISA_START_ADDRESS;
  16         entries[0].type = E820_RAM;
  17
  18         entries[1].addr = ISA_START_ADDRESS;
  19         entries[1].size = ISA_END_ADDRESS - ISA_START_ADDRESS;
  20         entries[1].type = E820_RESERVED;
  21
  22         /*
  23          * since we use memalign(malloc) to allocate high memory for
  24          * storing ACPI tables, we need to reserve them in e820 tables,
  25          * otherwise kernel will reclaim them and data will be corrupted
  26          */
  27         entries[2].addr = ISA_END_ADDRESS;
  28         entries[2].size = gd->relocaddr - TOTAL_MALLOC_LEN - ISA_END_ADDRESS;
  29         entries[2].type = E820_RAM;
  30
  31         /* for simplicity, reserve entire malloc space */
  32         entries[3].addr = gd->relocaddr - TOTAL_MALLOC_LEN;
  33         entries[3].size = TOTAL_MALLOC_LEN;
  34         entries[3].type = E820_RESERVED;
  35
  36         entries[4].addr = gd->relocaddr;
  37         entries[4].size = gd->ram_size - gd->relocaddr;
  38         entries[4].type = E820_RESERVED;
  39
  40         entries[5].addr = CONFIG_PCIE_ECAM_BASE;
  41         entries[5].size = CONFIG_PCIE_ECAM_SIZE;
  42         entries[5].type = E820_RESERVED;
  43
  44         return 6;
  45 }