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
  30 static 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
  46 bool 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 }