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
e820_add_entry(uint64_t address,uint64_t length,uint32_t type)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
e820_get_table(struct e820_entry ** table)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
e820_get_entry(int idx,uint32_t type,uint64_t * address,uint64_t * length)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 }
49