hw/i386/e820_memory_layout.c

   1 /*
   2  * QEMU BIOS e820 routines
   3  *
   4  * Copyright (c) 2003-2004 Fabrice Bellard
   5  *
   6  * SPDX-License-Identifier: MIT
   7  */
   8
   9 #include "qemu/osdep.h"
  10 #include "qemu/bswap.h"
  11 #include "e820_memory_layout.h"
  12
  13 static size_t e820_entries;
  14 struct e820_entry *e820_table;
  15
  16 int e820_add_entry(uint64_t address, uint64_t length, uint32_t type)
  17 {
  18     /* new "etc/e820" file -- include ram and reserved entries */
  19     e820_table = g_renew(struct e820_entry, e820_table, e820_entries + 1);
  20     e820_table[e820_entries].address = cpu_to_le64(address);
  21     e820_table[e820_entries].length = cpu_to_le64(length);
  22     e820_table[e820_entries].type = cpu_to_le32(type);
  23     e820_entries++;
  24
  25     return e820_entries;
  26 }
  27
  28 int e820_get_num_entries(void)
  29 {
  30     return e820_entries;
  31 }
  32
  33 bool e820_get_entry(int idx, uint32_t type, uint64_t *address, uint64_t *length)
  34 {
  35     if (idx < e820_entries && e820_table[idx].type == cpu_to_le32(type)) {
  36         *address = le64_to_cpu(e820_table[idx].address);
  37         *length = le64_to_cpu(e820_table[idx].length);
  38         return true;
  39     }
  40     return false;
  41 }