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
  42 OBJECT_DECLARE_SIMPLE_TYPE(TPMStateISA, TPM_TIS_ISA)
  43
  44 static int tpm_tis_pre_save_isa(void *opaque)
  45 {
  46     TPMStateISA *isadev = opaque;
  47
  48     return tpm_tis_pre_save(&isadev->state);
  49 }
  50
  51 static const VMStateDescription vmstate_tpm_tis_isa = {
  52     .name = "tpm-tis",
  53     .version_id = 0,
  54     .pre_save  = tpm_tis_pre_save_isa,
  55     .fields = (VMStateField[]) {
  56         VMSTATE_BUFFER(state.buffer, TPMStateISA),
  57         VMSTATE_UINT16(state.rw_offset, TPMStateISA),
  58         VMSTATE_UINT8(state.active_locty, TPMStateISA),
  59         VMSTATE_UINT8(state.aborting_locty, TPMStateISA),
  60         VMSTATE_UINT8(state.next_locty, TPMStateISA),
  61
  62         VMSTATE_STRUCT_ARRAY(state.loc, TPMStateISA, TPM_TIS_NUM_LOCALITIES, 0,
  63                              vmstate_locty, TPMLocality),
  64
  65         VMSTATE_END_OF_LIST()
  66     }
  67 };
  68
  69 static void tpm_tis_isa_request_completed(TPMIf *ti, int ret)
  70 {
  71     TPMStateISA *isadev = TPM_TIS_ISA(ti);
  72     TPMState *s = &isadev->state;
  73
  74     tpm_tis_request_completed(s, ret);
  75 }
  76
  77 static enum TPMVersion tpm_tis_isa_get_tpm_version(TPMIf *ti)
  78 {
  79     TPMStateISA *isadev = TPM_TIS_ISA(ti);
  80     TPMState *s = &isadev->state;
  81
  82     return tpm_tis_get_tpm_version(s);
  83 }
  84
  85 static void tpm_tis_isa_reset(DeviceState *dev)
  86 {
  87     TPMStateISA *isadev = TPM_TIS_ISA(dev);
  88     TPMState *s = &isadev->state;
  89
  90     return tpm_tis_reset(s);
  91 }
  92
  93 static Property tpm_tis_isa_properties[] = {
  94     DEFINE_PROP_UINT32("irq", TPMStateISA, state.irq_num, TPM_TIS_IRQ),
  95     DEFINE_PROP_TPMBE("tpmdev", TPMStateISA, state.be_driver),
  96     DEFINE_PROP_BOOL("ppi", TPMStateISA, state.ppi_enabled, true),
  97     DEFINE_PROP_END_OF_LIST(),
  98 };
  99
 100 static void tpm_tis_isa_initfn(Object *obj)
 101 {
 102     TPMStateISA *isadev = TPM_TIS_ISA(obj);
 103     TPMState *s = &isadev->state;
 104
 105     memory_region_init_io(&s->mmio, obj, &tpm_tis_memory_ops,
 106                           s, "tpm-tis-mmio",
 107                           TPM_TIS_NUM_LOCALITIES << TPM_TIS_LOCALITY_SHIFT);
 108 }
 109
 110 static void tpm_tis_isa_realizefn(DeviceState *dev, Error **errp)
 111 {
 112     TPMStateISA *isadev = TPM_TIS_ISA(dev);
 113     TPMState *s = &isadev->state;
 114
 115     if (!tpm_find()) {
 116         error_setg(errp, "at most one TPM device is permitted");
 117         return;
 118     }
 119
 120     if (!s->be_driver) {
 121         error_setg(errp, "'tpmdev' property is required");
 122         return;
 123     }
 124     if (s->irq_num > 15) {
 125         error_setg(errp, "IRQ %d is outside valid range of 0 to 15",
 126                    s->irq_num);
 127         return;
 128     }
 129
 130     isa_init_irq(ISA_DEVICE(dev), &s->irq, s->irq_num);
 131
 132     memory_region_add_subregion(isa_address_space(ISA_DEVICE(dev)),
 133                                 TPM_TIS_ADDR_BASE, &s->mmio);
 134
 135     if (s->ppi_enabled) {
 136         tpm_ppi_init(&s->ppi, isa_address_space(ISA_DEVICE(dev)),
 137                      TPM_PPI_ADDR_BASE, OBJECT(dev));
 138     }
 139 }
 140
 141 static void tpm_tis_isa_class_init(ObjectClass *klass, void *data)
 142 {
 143     DeviceClass *dc = DEVICE_CLASS(klass);
 144     TPMIfClass *tc = TPM_IF_CLASS(klass);
 145
 146     device_class_set_props(dc, tpm_tis_isa_properties);
 147     dc->vmsd  = &vmstate_tpm_tis_isa;
 148     tc->model = TPM_MODEL_TPM_TIS;
 149     dc->realize = tpm_tis_isa_realizefn;
 150     dc->reset = tpm_tis_isa_reset;
 151     tc->request_completed = tpm_tis_isa_request_completed;
 152     tc->get_version = tpm_tis_isa_get_tpm_version;
 153 }
 154
 155 static const TypeInfo tpm_tis_isa_info = {
 156     .name = TYPE_TPM_TIS_ISA,
 157     .parent = TYPE_ISA_DEVICE,
 158     .instance_size = sizeof(TPMStateISA),
 159     .instance_init = tpm_tis_isa_initfn,
 160     .class_init  = tpm_tis_isa_class_init,
 161     .interfaces = (InterfaceInfo[]) {
 162         { TYPE_TPM_IF },
 163         { }
 164     }
 165 };
 166
 167 static void tpm_tis_isa_register(void)
 168 {
 169     type_register_static(&tpm_tis_isa_info);
 170 }
 171
 172 type_init(tpm_tis_isa_register)