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 static struct e820_entry *e820_table;
  15 static gboolean e820_done;
  16
  17 void e820_add_entry(uint64_t address, uint64_t length, uint32_t type)
  18 {
  19     assert(!e820_done);
  20
  21     /* new "etc/e820" file -- include ram and reserved entries */
  22     e820_table = g_renew(struct e820_entry, e820_table, e820_entries + 1);
  23     e820_table[e820_entries].address = cpu_to_le64(address);
  24     e820_table[e820_entries].length = cpu_to_le64(length);
  25     e820_table[e820_entries].type = cpu_to_le32(type);
  26     e820_entries++;
  27 }
  28
  29 int e820_get_table(struct e820_entry **table)
  30 {
  31     e820_done = true;
  32
  33     if (table) {
  34         *table = e820_table;
  35     }
  36
  37     return e820_entries;
  38 }
  39
  40 bool e820_get_entry(int idx, uint32_t type, uint64_t *address, uint64_t *length)
  41 {
  42     if (idx < e820_entries && e820_table[idx].type == cpu_to_le32(type)) {
  43         *address = le64_to_cpu(e820_table[idx].address);
  44         *length = le64_to_cpu(e820_table[idx].length);
  45         return true;
  46     }
  47     return false;
  48 }