LXR qemu/hw/i386/e820_memory

   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
  13static size_t e820_entries;
  14struct e820_table e820_reserve;
  15struct e820_entry *e820_table;
  16
  17int 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
  46int e820_get_num_entries(void)
  47{
  48    return e820_entries;
  49}
  50
  51bool 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