hw/tpm/tpm_tis_isa.c

   1 /*
   2  * tpm_tis_isa.c - QEMU's TPM TIS ISA Device
   3  *
   4  * Copyright (C) 2006,2010-2013 IBM Corporation
   5  *
   6  * Authors:
   7  *  Stefan Berger <stefanb@us.ibm.com>
   8  *  David Safford <safford@us.ibm.com>
   9  *
  10  * Xen 4 support: Andrease Niederl <andreas.niederl@iaik.tugraz.at>
  11  *
  12  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  13  * See the COPYING file in the top-level directory.
  14  *
  15  * Implementation of the TIS interface according to specs found at
  16  * http://www.trustedcomputinggroup.org. This implementation currently
  17  * supports version 1.3, 21 March 2013
  18  * In the developers menu choose the PC Client section then find the TIS
  19  * specification.
  20  *
  21  * TPM TIS for TPM 2 implementation following TCG PC Client Platform
  22  * TPM Profile (PTP) Specification, Familiy 2.0, Revision 00.43
  23  */
  24
  25 #include "qemu/osdep.h"
  26 #include "hw/isa/isa.h"
  27 #include "hw/qdev-properties.h"
  28 #include "migration/vmstate.h"
  29 #include "hw/acpi/tpm.h"
  30 #include "tpm_prop.h"
  31 #include "tpm_tis.h"
  32 #include "qom/object.h"
  33
  34 struct TPMStateISA {
  35     /*< private >*/
  36     ISADevice parent_obj;
  37
  38     /*< public >*/
  39     TPMState state; /* not a QOM object */
  40 };
  41 typedef struct TPMStateISA TPMStateISA;
  42
  43 DECLARE_INSTANCE_CHECKER(TPMStateISA, TPM_TIS_ISA,
  44                          TYPE_TPM_TIS_ISA)
  45
  46 static int tpm_tis_pre_save_isa(void *opaque)
  47 {
  48     TPMStateISA *isadev = opaque;
  49
  50     return tpm_tis_pre_save(&isadev->state);
  51 }
  52
  53 static const VMStateDescription vmstate_tpm_tis_isa = {
  54     .name = "tpm-tis",
  55     .version_id = 0,
  56     .pre_save  = tpm_tis_pre_save_isa,
  57     .fields = (VMStateField[]) {
  58         VMSTATE_BUFFER(state.buffer, TPMStateISA),
  59         VMSTATE_UINT16(state.rw_offset, TPMStateISA),
  60         VMSTATE_UINT8(state.active_locty, TPMStateISA),
  61         VMSTATE_UINT8(state.aborting_locty, TPMStateISA),
  62         VMSTATE_UINT8(state.next_locty, TPMStateISA),
  63
  64         VMSTATE_STRUCT_ARRAY(state.loc, TPMStateISA, TPM_TIS_NUM_LOCALITIES, 0,
  65                              vmstate_locty, TPMLocality),
  66
  67         VMSTATE_END_OF_LIST()
  68     }
  69 };
  70
  71 static void tpm_tis_isa_request_completed(TPMIf *ti, int ret)
  72 {
  73     TPMStateISA *isadev = TPM_TIS_ISA(ti);
  74     TPMState *s = &isadev->state;
  75
  76     tpm_tis_request_completed(s, ret);
  77 }
  78
  79 static enum TPMVersion tpm_tis_isa_get_tpm_version(TPMIf *ti)
  80 {
  81     TPMStateISA *isadev = TPM_TIS_ISA(ti);
  82     TPMState *s = &isadev->state;
  83
  84     return tpm_tis_get_tpm_version(s);
  85 }
  86
  87 static void tpm_tis_isa_reset(DeviceState *dev)
  88 {
  89     TPMStateISA *isadev = TPM_TIS_ISA(dev);
  90     TPMState *s = &isadev->state;
  91
  92     return tpm_tis_reset(s);
  93 }
  94
  95 static Property tpm_tis_isa_properties[] = {
  96     DEFINE_PROP_UINT32("irq", TPMStateISA, state.irq_num, TPM_TIS_IRQ),
  97     DEFINE_PROP_TPMBE("tpmdev", TPMStateISA, state.be_driver),
  98     DEFINE_PROP_BOOL("ppi", TPMStateISA, state.ppi_enabled, true),
  99     DEFINE_PROP_END_OF_LIST(),
 100 };
 101
 102 static void tpm_tis_isa_initfn(Object *obj)
 103 {
 104     TPMStateISA *isadev = TPM_TIS_ISA(obj);
 105     TPMState *s = &isadev->state;
 106
 107     memory_region_init_io(&s->mmio, obj, &tpm_tis_memory_ops,
 108                           s, "tpm-tis-mmio",
 109                           TPM_TIS_NUM_LOCALITIES << TPM_TIS_LOCALITY_SHIFT);
 110 }
 111
 112 static void tpm_tis_isa_realizefn(DeviceState *dev, Error **errp)
 113 {
 114     TPMStateISA *isadev = TPM_TIS_ISA(dev);
 115     TPMState *s = &isadev->state;
 116
 117     if (!tpm_find()) {
 118         error_setg(errp, "at most one TPM device is permitted");
 119         return;
 120     }
 121
 122     if (!s->be_driver) {
 123         error_setg(errp, "'tpmdev' property is required");
 124         return;
 125     }
 126     if (s->irq_num > 15) {
 127         error_setg(errp, "IRQ %d is outside valid range of 0 to 15",
 128                    s->irq_num);
 129         return;
 130     }
 131
 132     isa_init_irq(ISA_DEVICE(dev), &s->irq, s->irq_num);
 133
 134     memory_region_add_subregion(isa_address_space(ISA_DEVICE(dev)),
 135                                 TPM_TIS_ADDR_BASE, &s->mmio);
 136
 137     if (s->ppi_enabled) {
 138         tpm_ppi_init(&s->ppi, isa_address_space(ISA_DEVICE(dev)),
 139                      TPM_PPI_ADDR_BASE, OBJECT(dev));
 140     }
 141 }
 142
 143 static void tpm_tis_isa_class_init(ObjectClass *klass, void *data)
 144 {
 145     DeviceClass *dc = DEVICE_CLASS(klass);
 146     TPMIfClass *tc = TPM_IF_CLASS(klass);
 147
 148     device_class_set_props(dc, tpm_tis_isa_properties);
 149     dc->vmsd  = &vmstate_tpm_tis_isa;
 150     tc->model = TPM_MODEL_TPM_TIS;
 151     dc->realize = tpm_tis_isa_realizefn;
 152     dc->reset = tpm_tis_isa_reset;
 153     tc->request_completed = tpm_tis_isa_request_completed;
 154     tc->get_version = tpm_tis_isa_get_tpm_version;
 155 }
 156
 157 static const TypeInfo tpm_tis_isa_info = {
 158     .name = TYPE_TPM_TIS_ISA,
 159     .parent = TYPE_ISA_DEVICE,
 160     .instance_size = sizeof(TPMStateISA),
 161     .instance_init = tpm_tis_isa_initfn,
 162     .class_init  = tpm_tis_isa_class_init,
 163     .interfaces = (InterfaceInfo[]) {
 164         { TYPE_TPM_IF },
 165         { }
 166     }
 167 };
 168
 169 static void tpm_tis_isa_register(void)
 170 {
 171     type_register_static(&tpm_tis_isa_info);
 172 }
 173
 174 type_init(tpm_tis_isa_register)