arch/x86/cpu/qemu/e820.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * QEMU x86 specific E820 table generation
   4  *
   5  * (C) Copyright 2015 Miao Yan <yanmiaobest@gmail.com>
   6  * (C) Copyright 2019 Bin Meng <bmeng.cn@gmail.com>
   7  */
   8
   9 #include <common.h>
  10 #include <env_internal.h>
  11 #include <malloc.h>
  12 #include <asm/e820.h>
  13 #include <asm/arch/qemu.h>
  14
  15 DECLARE_GLOBAL_DATA_PTR;
  16
  17 unsigned int install_e820_map(unsigned int max_entries,
  18                               struct e820_entry *entries)
  19 {
  20         u64 high_mem_size;
  21         int n = 0;
  22
  23         entries[n].addr = 0;
  24         entries[n].size = ISA_START_ADDRESS;
  25         entries[n].type = E820_RAM;
  26         n++;
  27
  28         entries[n].addr = ISA_START_ADDRESS;
  29         entries[n].size = ISA_END_ADDRESS - ISA_START_ADDRESS;
  30         entries[n].type = E820_RESERVED;
  31         n++;
  32
  33         /*
  34          * since we use memalign(malloc) to allocate high memory for
  35          * storing ACPI tables, we need to reserve them in e820 tables,
  36          * otherwise kernel will reclaim them and data will be corrupted
  37          */
  38         entries[n].addr = ISA_END_ADDRESS;
  39         entries[n].size = gd->relocaddr - TOTAL_MALLOC_LEN - ISA_END_ADDRESS;
  40         entries[n].type = E820_RAM;
  41         n++;
  42
  43         /* for simplicity, reserve entire malloc space */
  44         entries[n].addr = gd->relocaddr - TOTAL_MALLOC_LEN;
  45         entries[n].size = TOTAL_MALLOC_LEN;
  46         entries[n].type = E820_RESERVED;
  47         n++;
  48
  49         entries[n].addr = gd->relocaddr;
  50         entries[n].size = qemu_get_low_memory_size() - gd->relocaddr;
  51         entries[n].type = E820_RESERVED;
  52         n++;
  53
  54         entries[n].addr = CONFIG_PCIE_ECAM_BASE;
  55         entries[n].size = CONFIG_PCIE_ECAM_SIZE;
  56         entries[n].type = E820_RESERVED;
  57         n++;
  58
  59         high_mem_size = qemu_get_high_memory_size();
  60         if (high_mem_size) {
  61                 entries[n].addr = SZ_4G;
  62                 entries[n].size = high_mem_size;
  63                 entries[n].type = E820_RAM;
  64                 n++;
  65         }
  66
  67         return n;
  68 }