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
e820_add_entry(uint64_t address,uint64_t length,uint32_t type)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
e820_get_num_entries(void)28 int e820_get_num_entries(void)
29 {
30 return e820_entries;
31 }
32
e820_get_entry(int idx,uint32_t type,uint64_t * address,uint64_t * length)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 }
42