| 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 | } |