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tpm_tis_sysbus.c (4683B)

      1 /*
      2  * tpm_tis_sysbus.c - QEMU's TPM TIS SYSBUS 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/qdev-properties.h"
     27 #include "migration/vmstate.h"
     28 #include "hw/acpi/tpm.h"
     29 #include "tpm_prop.h"
     30 #include "hw/sysbus.h"
     31 #include "tpm_tis.h"
     32 #include "qom/object.h"
     33 
     34 struct TPMStateSysBus {
     35     /*< private >*/
     36     SysBusDevice parent_obj;
     37 
     38     /*< public >*/
     39     TPMState state; /* not a QOM object */
     40 };
     41 
     42 OBJECT_DECLARE_SIMPLE_TYPE(TPMStateSysBus, TPM_TIS_SYSBUS)
     43 
     44 static int tpm_tis_pre_save_sysbus(void *opaque)
     45 {
     46     TPMStateSysBus *sbdev = opaque;
     47 
     48     return tpm_tis_pre_save(&sbdev->state);
     49 }
     50 
     51 static const VMStateDescription vmstate_tpm_tis_sysbus = {
     52     .name = "tpm-tis",
     53     .version_id = 0,
     54     .pre_save  = tpm_tis_pre_save_sysbus,
     55     .fields = (VMStateField[]) {
     56         VMSTATE_BUFFER(state.buffer, TPMStateSysBus),
     57         VMSTATE_UINT16(state.rw_offset, TPMStateSysBus),
     58         VMSTATE_UINT8(state.active_locty, TPMStateSysBus),
     59         VMSTATE_UINT8(state.aborting_locty, TPMStateSysBus),
     60         VMSTATE_UINT8(state.next_locty, TPMStateSysBus),
     61 
     62         VMSTATE_STRUCT_ARRAY(state.loc, TPMStateSysBus, TPM_TIS_NUM_LOCALITIES,
     63                              0, vmstate_locty, TPMLocality),
     64 
     65         VMSTATE_END_OF_LIST()
     66     }
     67 };
     68 
     69 static void tpm_tis_sysbus_request_completed(TPMIf *ti, int ret)
     70 {
     71     TPMStateSysBus *sbdev = TPM_TIS_SYSBUS(ti);
     72     TPMState *s = &sbdev->state;
     73 
     74     tpm_tis_request_completed(s, ret);
     75 }
     76 
     77 static enum TPMVersion tpm_tis_sysbus_get_tpm_version(TPMIf *ti)
     78 {
     79     TPMStateSysBus *sbdev = TPM_TIS_SYSBUS(ti);
     80     TPMState *s = &sbdev->state;
     81 
     82     return tpm_tis_get_tpm_version(s);
     83 }
     84 
     85 static void tpm_tis_sysbus_reset(DeviceState *dev)
     86 {
     87     TPMStateSysBus *sbdev = TPM_TIS_SYSBUS(dev);
     88     TPMState *s = &sbdev->state;
     89 
     90     return tpm_tis_reset(s);
     91 }
     92 
     93 static Property tpm_tis_sysbus_properties[] = {
     94     DEFINE_PROP_UINT32("irq", TPMStateSysBus, state.irq_num, TPM_TIS_IRQ),
     95     DEFINE_PROP_TPMBE("tpmdev", TPMStateSysBus, state.be_driver),
     96     DEFINE_PROP_BOOL("ppi", TPMStateSysBus, state.ppi_enabled, false),
     97     DEFINE_PROP_END_OF_LIST(),
     98 };
     99 
    100 static void tpm_tis_sysbus_initfn(Object *obj)
    101 {
    102     TPMStateSysBus *sbdev = TPM_TIS_SYSBUS(obj);
    103     TPMState *s = &sbdev->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     sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio);
    110     sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irq);
    111 }
    112 
    113 static void tpm_tis_sysbus_realizefn(DeviceState *dev, Error **errp)
    114 {
    115     TPMStateSysBus *sbdev = TPM_TIS_SYSBUS(dev);
    116     TPMState *s = &sbdev->state;
    117 
    118     if (!tpm_find()) {
    119         error_setg(errp, "at most one TPM device is permitted");
    120         return;
    121     }
    122 
    123     if (!s->be_driver) {
    124         error_setg(errp, "'tpmdev' property is required");
    125         return;
    126     }
    127 }
    128 
    129 static void tpm_tis_sysbus_class_init(ObjectClass *klass, void *data)
    130 {
    131     DeviceClass *dc = DEVICE_CLASS(klass);
    132     TPMIfClass *tc = TPM_IF_CLASS(klass);
    133 
    134     device_class_set_props(dc, tpm_tis_sysbus_properties);
    135     dc->vmsd  = &vmstate_tpm_tis_sysbus;
    136     tc->model = TPM_MODEL_TPM_TIS;
    137     dc->realize = tpm_tis_sysbus_realizefn;
    138     dc->user_creatable = true;
    139     dc->reset = tpm_tis_sysbus_reset;
    140     tc->request_completed = tpm_tis_sysbus_request_completed;
    141     tc->get_version = tpm_tis_sysbus_get_tpm_version;
    142     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
    143 }
    144 
    145 static const TypeInfo tpm_tis_sysbus_info = {
    146     .name = TYPE_TPM_TIS_SYSBUS,
    147     .parent = TYPE_SYS_BUS_DEVICE,
    148     .instance_size = sizeof(TPMStateSysBus),
    149     .instance_init = tpm_tis_sysbus_initfn,
    150     .class_init  = tpm_tis_sysbus_class_init,
    151     .interfaces = (InterfaceInfo[]) {
    152         { TYPE_TPM_IF },
    153         { }
    154     }
    155 };
    156 
    157 static void tpm_tis_sysbus_register(void)
    158 {
    159     type_register_static(&tpm_tis_sysbus_info);
    160 }
    161 
    162 type_init(tpm_tis_sysbus_register)