cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

e820_memory_layout.c (1571B)

      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}