xref: /qemu/target/i386/tcg/system/tcg-cpu.c (revision 342e313d6c1a8e6da758bd642777b85af1a0fc37)

/*
 * i386 TCG cpu class initialization functions specific to system emulation
 *
 *  Copyright (c) 2003 Fabrice Bellard
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 */

#include "qemu/osdep.h"
#include "cpu.h"
#include "tcg/helper-tcg.h"

#include "system/system.h"
#include "qemu/units.h"
#include "system/address-spaces.h"
#include "system/memory.h"

#include "tcg/tcg-cpu.h"

static void tcg_cpu_machine_done(Notifier *n, void *unused)
{
    X86CPU *cpu = container_of(n, X86CPU, machine_done);
    MemoryRegion *smram =
        (MemoryRegion *) object_resolve_path("/machine/smram", NULL);

    if (smram) {
        cpu->smram = g_new(MemoryRegion, 1);
        memory_region_init_alias(cpu->smram, OBJECT(cpu), "smram",
                                 smram, 0, 4 * GiB);
        memory_region_set_enabled(cpu->smram, true);
        memory_region_add_subregion_overlap(cpu->cpu_as_root, 0,
                                            cpu->smram, 1);
    }
}

bool tcg_cpu_realizefn(CPUState *cs, Error **errp)
{
    X86CPU *cpu = X86_CPU(cs);

    /*
     * The realize order is important, since x86_cpu_realize() checks if
     * nothing else has been set by the user (or by accelerators) in
     * cpu->ucode_rev and cpu->phys_bits, and the memory regions
     * initialized here are needed for the vcpu initialization.
     *
     * realize order:
     * tcg_cpu -> host_cpu -> x86_cpu
     */
    cpu->cpu_as_mem = g_new(MemoryRegion, 1);
    cpu->cpu_as_root = g_new(MemoryRegion, 1);

    /* Outer container... */
    memory_region_init(cpu->cpu_as_root, OBJECT(cpu), "memory", ~0ull);
    memory_region_set_enabled(cpu->cpu_as_root, true);

    /*
     * ... with two regions inside: normal system memory with low
     * priority, and...
     */
    memory_region_init_alias(cpu->cpu_as_mem, OBJECT(cpu), "memory",
                             get_system_memory(), 0, ~0ull);
    memory_region_add_subregion_overlap(cpu->cpu_as_root, 0, cpu->cpu_as_mem, 0);
    memory_region_set_enabled(cpu->cpu_as_mem, true);

    cs->num_ases = 2;
    cpu_address_space_init(cs, 0, "cpu-memory", cs->memory);
    cpu_address_space_init(cs, 1, "cpu-smm", cpu->cpu_as_root);

    /* ... SMRAM with higher priority, linked from /machine/smram.  */
    cpu->machine_done.notify = tcg_cpu_machine_done;
    qemu_add_machine_init_done_notifier(&cpu->machine_done);
    return true;
}