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_table e820_reserve; 15 struct e820_entry *e820_table; 16 17 int e820_add_entry(uint64_t address, uint64_t length, uint32_t type) 18 { 19 int index = le32_to_cpu(e820_reserve.count); 20 struct e820_entry *entry; 21 22 if (type != E820_RAM) { 23 /* old FW_CFG_E820_TABLE entry -- reservations only */ 24 if (index >= E820_NR_ENTRIES) { 25 return -EBUSY; 26 } 27 entry = &e820_reserve.entry[index++]; 28 29 entry->address = cpu_to_le64(address); 30 entry->length = cpu_to_le64(length); 31 entry->type = cpu_to_le32(type); 32 33 e820_reserve.count = cpu_to_le32(index); 34 } 35 36 /* new "etc/e820" file -- include ram too */ 37 e820_table = g_renew(struct e820_entry, e820_table, e820_entries + 1); 38 e820_table[e820_entries].address = cpu_to_le64(address); 39 e820_table[e820_entries].length = cpu_to_le64(length); 40 e820_table[e820_entries].type = cpu_to_le32(type); 41 e820_entries++; 42 43 return e820_entries; 44 } 45 46 int e820_get_num_entries(void) 47 { 48 return e820_entries; 49 } 50 51 bool e820_get_entry(int idx, uint32_t type, uint64_t *address, uint64_t *length) 52 { 53 if (idx < e820_entries && e820_table[idx].type == cpu_to_le32(type)) { 54 *address = le64_to_cpu(e820_table[idx].address); 55 *length = le64_to_cpu(e820_table[idx].length); 56 return true; 57 } 58 return false; 59 } 60