cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
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pam.c (2927B)

      1/*
      2 * QEMU Smram/pam logic implementation
      3 *
      4 * Copyright (c) 2006 Fabrice Bellard
      5 * Copyright (c) 2011 Isaku Yamahata <yamahata at valinux co jp>
      6 *                    VA Linux Systems Japan K.K.
      7 * Copyright (c) 2012 Jason Baron <jbaron@redhat.com>
      8 *
      9 * Split out from piix.c
     10 *
     11 * Permission is hereby granted, free of charge, to any person obtaining a copy
     12 * of this software and associated documentation files (the "Software"), to deal
     13 * in the Software without restriction, including without limitation the rights
     14 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     15 * copies of the Software, and to permit persons to whom the Software is
     16 * furnished to do so, subject to the following conditions:
     17 *
     18 * The above copyright notice and this permission notice shall be included in
     19 * all copies or substantial portions of the Software.
     20 *
     21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
     24 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     25 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     26 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
     27 * THE SOFTWARE.
     28 */
     29
     30#include "qemu/osdep.h"
     31#include "hw/pci-host/pam.h"
     32
     33void init_pam(DeviceState *dev, MemoryRegion *ram_memory,
     34              MemoryRegion *system_memory, MemoryRegion *pci_address_space,
     35              PAMMemoryRegion *mem, uint32_t start, uint32_t size)
     36{
     37    int i;
     38
     39    /* RAM */
     40    memory_region_init_alias(&mem->alias[3], OBJECT(dev), "pam-ram", ram_memory,
     41                             start, size);
     42    /* ROM (XXX: not quite correct) */
     43    memory_region_init_alias(&mem->alias[1], OBJECT(dev), "pam-rom", ram_memory,
     44                             start, size);
     45    memory_region_set_readonly(&mem->alias[1], true);
     46
     47    /* XXX: should distinguish read/write cases */
     48    memory_region_init_alias(&mem->alias[0], OBJECT(dev), "pam-pci", pci_address_space,
     49                             start, size);
     50    memory_region_init_alias(&mem->alias[2], OBJECT(dev), "pam-pci", ram_memory,
     51                             start, size);
     52
     53    memory_region_transaction_begin();
     54    for (i = 0; i < 4; ++i) {
     55        memory_region_set_enabled(&mem->alias[i], false);
     56        memory_region_add_subregion_overlap(system_memory, start,
     57                                            &mem->alias[i], 1);
     58    }
     59    memory_region_transaction_commit();
     60    mem->current = 0;
     61}
     62
     63void pam_update(PAMMemoryRegion *pam, int idx, uint8_t val)
     64{
     65    assert(0 <= idx && idx < PAM_REGIONS_COUNT);
     66
     67    memory_region_set_enabled(&pam->alias[pam->current], false);
     68    pam->current = (val >> ((!(idx & 1)) * 4)) & PAM_ATTR_MASK;
     69    memory_region_set_enabled(&pam->alias[pam->current], true);
     70}