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 } 49