LXR qemu/target/i386/tcg/sysemu/tcg-cpu.c

   1/*
   2 * i386 TCG cpu class initialization functions specific to sysemu
   3 *
   4 *  Copyright (c) 2003 Fabrice Bellard
   5 *
   6 * This library is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU Lesser General Public
   8 * License as published by the Free Software Foundation; either
   9 * version 2 of the License, or (at your option) any later version.
  10 *
  11 * This library is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 * Lesser General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU Lesser General Public
  17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20#include "qemu/osdep.h"
  21#include "cpu.h"
  22#include "tcg/helper-tcg.h"
  23
  24#include "sysemu/sysemu.h"
  25#include "qemu/units.h"
  26#include "exec/address-spaces.h"
  27
  28#include "tcg/tcg-cpu.h"
  29
  30static void tcg_cpu_machine_done(Notifier *n, void *unused)
  31{
  32    X86CPU *cpu = container_of(n, X86CPU, machine_done);
  33    MemoryRegion *smram =
  34        (MemoryRegion *) object_resolve_path("/machine/smram", NULL);
  35
  36    if (smram) {
  37        cpu->smram = g_new(MemoryRegion, 1);
  38        memory_region_init_alias(cpu->smram, OBJECT(cpu), "smram",
  39                                 smram, 0, 4 * GiB);
  40        memory_region_set_enabled(cpu->smram, true);
  41        memory_region_add_subregion_overlap(cpu->cpu_as_root, 0,
  42                                            cpu->smram, 1);
  43    }
  44}
  45
  46bool tcg_cpu_realizefn(CPUState *cs, Error **errp)
  47{
  48    X86CPU *cpu = X86_CPU(cs);
  49
  50    /*
  51     * The realize order is important, since x86_cpu_realize() checks if
  52     * nothing else has been set by the user (or by accelerators) in
  53     * cpu->ucode_rev and cpu->phys_bits, and the memory regions
  54     * initialized here are needed for the vcpu initialization.
  55     *
  56     * realize order:
  57     * tcg_cpu -> host_cpu -> x86_cpu
  58     */
  59    cpu->cpu_as_mem = g_new(MemoryRegion, 1);
  60    cpu->cpu_as_root = g_new(MemoryRegion, 1);
  61
  62    /* Outer container... */
  63    memory_region_init(cpu->cpu_as_root, OBJECT(cpu), "memory", ~0ull);
  64    memory_region_set_enabled(cpu->cpu_as_root, true);
  65
  66    /*
  67     * ... with two regions inside: normal system memory with low
  68     * priority, and...
  69     */
  70    memory_region_init_alias(cpu->cpu_as_mem, OBJECT(cpu), "memory",
  71                             get_system_memory(), 0, ~0ull);
  72    memory_region_add_subregion_overlap(cpu->cpu_as_root, 0, cpu->cpu_as_mem, 0);
  73    memory_region_set_enabled(cpu->cpu_as_mem, true);
  74
  75    cs->num_ases = 2;
  76    cpu_address_space_init(cs, 0, "cpu-memory", cs->memory);
  77    cpu_address_space_init(cs, 1, "cpu-smm", cpu->cpu_as_root);
  78
  79    /* ... SMRAM with higher priority, linked from /machine/smram.  */
  80    cpu->machine_done.notify = tcg_cpu_machine_done;
  81    qemu_add_machine_init_done_notifier(&cpu->machine_done);
  82    return true;
  83}
  84