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
  33 typedef struct TPMStateISA {
  34     /*< private >*/
  35     ISADevice parent_obj;
  36
  37     /*< public >*/
  38     TPMState state; /* not a QOM object */
  39 } TPMStateISA;
  40
  41 #define TPM_TIS_ISA(obj) OBJECT_CHECK(TPMStateISA, (obj), TYPE_TPM_TIS_ISA)
  42
  43 static int tpm_tis_pre_save_isa(void *opaque)
  44 {
  45     TPMStateISA *isadev = opaque;
  46
  47     return tpm_tis_pre_save(&isadev->state);
  48 }
  49
  50 static const VMStateDescription vmstate_tpm_tis_isa = {
  51     .name = "tpm-tis",
  52     .version_id = 0,
  53     .pre_save  = tpm_tis_pre_save_isa,
  54     .fields = (VMStateField[]) {
  55         VMSTATE_BUFFER(state.buffer, TPMStateISA),
  56         VMSTATE_UINT16(state.rw_offset, TPMStateISA),
  57         VMSTATE_UINT8(state.active_locty, TPMStateISA),
  58         VMSTATE_UINT8(state.aborting_locty, TPMStateISA),
  59         VMSTATE_UINT8(state.next_locty, TPMStateISA),
  60
  61         VMSTATE_STRUCT_ARRAY(state.loc, TPMStateISA, TPM_TIS_NUM_LOCALITIES, 0,
  62                              vmstate_locty, TPMLocality),
  63
  64         VMSTATE_END_OF_LIST()
  65     }
  66 };
  67
  68 static void tpm_tis_isa_request_completed(TPMIf *ti, int ret)
  69 {
  70     TPMStateISA *isadev = TPM_TIS_ISA(ti);
  71     TPMState *s = &isadev->state;
  72
  73     tpm_tis_request_completed(s, ret);
  74 }
  75
  76 static enum TPMVersion tpm_tis_isa_get_tpm_version(TPMIf *ti)
  77 {
  78     TPMStateISA *isadev = TPM_TIS_ISA(ti);
  79     TPMState *s = &isadev->state;
  80
  81     return tpm_tis_get_tpm_version(s);
  82 }
  83
  84 static void tpm_tis_isa_reset(DeviceState *dev)
  85 {
  86     TPMStateISA *isadev = TPM_TIS_ISA(dev);
  87     TPMState *s = &isadev->state;
  88
  89     return tpm_tis_reset(s);
  90 }
  91
  92 static Property tpm_tis_isa_properties[] = {
  93     DEFINE_PROP_UINT32("irq", TPMStateISA, state.irq_num, TPM_TIS_IRQ),
  94     DEFINE_PROP_TPMBE("tpmdev", TPMStateISA, state.be_driver),
  95     DEFINE_PROP_BOOL("ppi", TPMStateISA, state.ppi_enabled, true),
  96     DEFINE_PROP_END_OF_LIST(),
  97 };
  98
  99 static void tpm_tis_isa_initfn(Object *obj)
 100 {
 101     TPMStateISA *isadev = TPM_TIS_ISA(obj);
 102     TPMState *s = &isadev->state;
 103
 104     memory_region_init_io(&s->mmio, obj, &tpm_tis_memory_ops,
 105                           s, "tpm-tis-mmio",
 106                           TPM_TIS_NUM_LOCALITIES << TPM_TIS_LOCALITY_SHIFT);
 107 }
 108
 109 static void tpm_tis_isa_realizefn(DeviceState *dev, Error **errp)
 110 {
 111     TPMStateISA *isadev = TPM_TIS_ISA(dev);
 112     TPMState *s = &isadev->state;
 113
 114     if (!tpm_find()) {
 115         error_setg(errp, "at most one TPM device is permitted");
 116         return;
 117     }
 118
 119     if (!s->be_driver) {
 120         error_setg(errp, "'tpmdev' property is required");
 121         return;
 122     }
 123     if (s->irq_num > 15) {
 124         error_setg(errp, "IRQ %d is outside valid range of 0 to 15",
 125                    s->irq_num);
 126         return;
 127     }
 128
 129     isa_init_irq(ISA_DEVICE(dev), &s->irq, s->irq_num);
 130
 131     memory_region_add_subregion(isa_address_space(ISA_DEVICE(dev)),
 132                                 TPM_TIS_ADDR_BASE, &s->mmio);
 133
 134     if (s->ppi_enabled) {
 135         tpm_ppi_init(&s->ppi, isa_address_space(ISA_DEVICE(dev)),
 136                      TPM_PPI_ADDR_BASE, OBJECT(dev));
 137     }
 138 }
 139
 140 static void tpm_tis_isa_class_init(ObjectClass *klass, void *data)
 141 {
 142     DeviceClass *dc = DEVICE_CLASS(klass);
 143     TPMIfClass *tc = TPM_IF_CLASS(klass);
 144
 145     device_class_set_props(dc, tpm_tis_isa_properties);
 146     dc->vmsd  = &vmstate_tpm_tis_isa;
 147     tc->model = TPM_MODEL_TPM_TIS;
 148     dc->realize = tpm_tis_isa_realizefn;
 149     dc->reset = tpm_tis_isa_reset;
 150     tc->request_completed = tpm_tis_isa_request_completed;
 151     tc->get_version = tpm_tis_isa_get_tpm_version;
 152 }
 153
 154 static const TypeInfo tpm_tis_isa_info = {
 155     .name = TYPE_TPM_TIS_ISA,
 156     .parent = TYPE_ISA_DEVICE,
 157     .instance_size = sizeof(TPMStateISA),
 158     .instance_init = tpm_tis_isa_initfn,
 159     .class_init  = tpm_tis_isa_class_init,
 160     .interfaces = (InterfaceInfo[]) {
 161         { TYPE_TPM_IF },
 162         { }
 163     }
 164 };
 165
 166 static void tpm_tis_isa_register(void)
 167 {
 168     type_register_static(&tpm_tis_isa_info);
 169 }
 170
 171 type_init(tpm_tis_isa_register)