Archipelago » qemu

/*

 * QEMU i440FX/PIIX3 PCI Bridge Emulation

 *

 * Copyright (c) 2006 Fabrice Bellard

 * Copyright (c) 2011 Isaku Yamahata <yamahata at valinux co jp>

 *                    VA Linux Systems Japan K.K.

 * Copyright (c) 2012 Jason Baron <jbaron@redhat.com>

 *

 * Split out from piix_pci.c

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include "sysemu/sysemu.h"

#include "hw/pci-host/pam.h"

void smram_update(MemoryRegion *smram_region, uint8_t smram,

                  uint8_t smm_enabled)

{

    bool smram_enabled;

    smram_enabled = ((smm_enabled && (smram & SMRAM_G_SMRAME)) ||

                        (smram & SMRAM_D_OPEN));

    memory_region_set_enabled(smram_region, !smram_enabled);

}

void smram_set_smm(uint8_t *host_smm_enabled, int smm, uint8_t smram,

                   MemoryRegion *smram_region)

{

    uint8_t smm_enabled = (smm != 0);

    if (*host_smm_enabled != smm_enabled) {

        *host_smm_enabled = smm_enabled;

        smram_update(smram_region, smram, *host_smm_enabled);

    }

}

void init_pam(MemoryRegion *ram_memory, MemoryRegion *system_memory,

              MemoryRegion *pci_address_space, PAMMemoryRegion *mem,

              uint32_t start, uint32_t size)

{

    int i;

    /* RAM */

    memory_region_init_alias(&mem->alias[3], "pam-ram", ram_memory,

                             start, size);

    /* ROM (XXX: not quite correct) */

    memory_region_init_alias(&mem->alias[1], "pam-rom", ram_memory,

                             start, size);

    memory_region_set_readonly(&mem->alias[1], true);

    /* XXX: should distinguish read/write cases */

    memory_region_init_alias(&mem->alias[0], "pam-pci", pci_address_space,

                             start, size);

    memory_region_init_alias(&mem->alias[2], "pam-pci", pci_address_space,

                             start, size);

    for (i = 0; i < 4; ++i) {

        memory_region_set_enabled(&mem->alias[i], false);

        memory_region_add_subregion_overlap(system_memory, start,

                                            &mem->alias[i], 1);

    }

    mem->current = 0;

}

void pam_update(PAMMemoryRegion *pam, int idx, uint8_t val)

{

    assert(0 <= idx && idx <= 12);

    memory_region_set_enabled(&pam->alias[pam->current], false);

    pam->current = (val >> ((!(idx & 1)) * 4)) & PAM_ATTR_MASK;

    memory_region_set_enabled(&pam->alias[pam->current], true);

}