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 <asm/e820.h>
  12 #include <asm/arch/qemu.h>
  13
  14 DECLARE_GLOBAL_DATA_PTR;
  15
  16 unsigned int install_e820_map(unsigned int max_entries,
  17                               struct e820_entry *entries)
  18 {
  19         u64 high_mem_size;
  20         int n = 0;
  21
  22         entries[n].addr = 0;
  23         entries[n].size = ISA_START_ADDRESS;
  24         entries[n].type = E820_RAM;
  25         n++;
  26
  27         entries[n].addr = ISA_START_ADDRESS;
  28         entries[n].size = ISA_END_ADDRESS - ISA_START_ADDRESS;
  29         entries[n].type = E820_RESERVED;
  30         n++;
  31
  32         /*
  33          * since we use memalign(malloc) to allocate high memory for
  34          * storing ACPI tables, we need to reserve them in e820 tables,
  35          * otherwise kernel will reclaim them and data will be corrupted
  36          */
  37         entries[n].addr = ISA_END_ADDRESS;
  38         entries[n].size = gd->relocaddr - TOTAL_MALLOC_LEN - ISA_END_ADDRESS;
  39         entries[n].type = E820_RAM;
  40         n++;
  41
  42         /* for simplicity, reserve entire malloc space */
  43         entries[n].addr = gd->relocaddr - TOTAL_MALLOC_LEN;
  44         entries[n].size = TOTAL_MALLOC_LEN;
  45         entries[n].type = E820_RESERVED;
  46         n++;
  47
  48         entries[n].addr = gd->relocaddr;
  49         entries[n].size = qemu_get_low_memory_size() - gd->relocaddr;
  50         entries[n].type = E820_RESERVED;
  51         n++;
  52
  53         entries[n].addr = CONFIG_PCIE_ECAM_BASE;
  54         entries[n].size = CONFIG_PCIE_ECAM_SIZE;
  55         entries[n].type = E820_RESERVED;
  56         n++;
  57
  58         high_mem_size = qemu_get_high_memory_size();
  59         if (high_mem_size) {
  60                 entries[n].addr = SZ_4G;
  61                 entries[n].size = high_mem_size;
  62                 entries[n].type = E820_RAM;
  63                 n++;
  64         }
  65
  66         return n;
  67 }