LXR qemu/hw/pci-host/pam.c

   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 "qom/object.h"
  32#include "sysemu/sysemu.h"
  33#include "hw/pci-host/pam.h"
  34
  35void init_pam(DeviceState *dev, MemoryRegion *ram_memory,
  36              MemoryRegion *system_memory, MemoryRegion *pci_address_space,
  37              PAMMemoryRegion *mem, uint32_t start, uint32_t size)
  38{
  39    int i;
  40
  41    /* RAM */
  42    memory_region_init_alias(&mem->alias[3], OBJECT(dev), "pam-ram", ram_memory,
  43                             start, size);
  44    /* ROM (XXX: not quite correct) */
  45    memory_region_init_alias(&mem->alias[1], OBJECT(dev), "pam-rom", ram_memory,
  46                             start, size);
  47    memory_region_set_readonly(&mem->alias[1], true);
  48
  49    /* XXX: should distinguish read/write cases */
  50    memory_region_init_alias(&mem->alias[0], OBJECT(dev), "pam-pci", pci_address_space,
  51                             start, size);
  52    memory_region_init_alias(&mem->alias[2], OBJECT(dev), "pam-pci", ram_memory,
  53                             start, size);
  54
  55    for (i = 0; i < 4; ++i) {
  56        memory_region_set_enabled(&mem->alias[i], false);
  57        memory_region_add_subregion_overlap(system_memory, start,
  58                                            &mem->alias[i], 1);
  59    }
  60    mem->current = 0;
  61}
  62
  63void pam_update(PAMMemoryRegion *pam, int idx, uint8_t val)
  64{
  65    assert(0 <= idx && idx <= 12);
  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}
  71