LXR qemu/hw/pam.c

   1/*
   2 * QEMU i440FX/PIIX3 PCI Bridge Emulation
   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_pci.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#include "sysemu/sysemu.h"
  30#include "pam.h"
  31
  32void smram_update(MemoryRegion *smram_region, uint8_t smram,
  33                  uint8_t smm_enabled)
  34{
  35    bool smram_enabled;
  36
  37    smram_enabled = ((smm_enabled && (smram & SMRAM_G_SMRAME)) ||
  38                        (smram & SMRAM_D_OPEN));
  39    memory_region_set_enabled(smram_region, !smram_enabled);
  40}
  41
  42void smram_set_smm(uint8_t *host_smm_enabled, int smm, uint8_t smram,
  43                   MemoryRegion *smram_region)
  44{
  45    uint8_t smm_enabled = (smm != 0);
  46    if (*host_smm_enabled != smm_enabled) {
  47        *host_smm_enabled = smm_enabled;
  48        smram_update(smram_region, smram, *host_smm_enabled);
  49    }
  50}
  51
  52void init_pam(MemoryRegion *ram_memory, MemoryRegion *system_memory,
  53              MemoryRegion *pci_address_space, PAMMemoryRegion *mem,
  54              uint32_t start, uint32_t size)
  55{
  56    int i;
  57
  58    /* RAM */
  59    memory_region_init_alias(&mem->alias[3], "pam-ram", ram_memory,
  60                             start, size);
  61    /* ROM (XXX: not quite correct) */
  62    memory_region_init_alias(&mem->alias[1], "pam-rom", ram_memory,
  63                             start, size);
  64    memory_region_set_readonly(&mem->alias[1], true);
  65
  66    /* XXX: should distinguish read/write cases */
  67    memory_region_init_alias(&mem->alias[0], "pam-pci", pci_address_space,
  68                             start, size);
  69    memory_region_init_alias(&mem->alias[2], "pam-pci", pci_address_space,
  70                             start, size);
  71
  72    for (i = 0; i < 4; ++i) {
  73        memory_region_set_enabled(&mem->alias[i], false);
  74        memory_region_add_subregion_overlap(system_memory, start,
  75                                            &mem->alias[i], 1);
  76    }
  77    mem->current = 0;
  78}
  79
  80void pam_update(PAMMemoryRegion *pam, int idx, uint8_t val)
  81{
  82    assert(0 <= idx && idx <= 12);
  83
  84    memory_region_set_enabled(&pam->alias[pam->current], false);
  85    pam->current = (val >> ((!(idx & 1)) * 4)) & PAM_ATTR_MASK;
  86    memory_region_set_enabled(&pam->alias[pam->current], true);
  87}
  88