hw/s390x/sclp.c

   1 /*
   2  * SCLP Support
   3  *
   4  * Copyright IBM, Corp. 2012
   5  *
   6  * Authors:
   7  *  Christian Borntraeger <borntraeger@de.ibm.com>
   8  *  Heinz Graalfs <graalfs@linux.vnet.ibm.com>
   9  *
  10  * This work is licensed under the terms of the GNU GPL, version 2 or (at your
  11  * option) any later version.  See the COPYING file in the top-level directory.
  12  *
  13  */
  14
  15 #include "cpu.h"
  16 #include "sysemu/kvm.h"
  17 #include "exec/memory.h"
  18
  19 #include "sclp.h"
  20
  21 static inline S390SCLPDevice *get_event_facility(void)
  22 {
  23     ObjectProperty *op = object_property_find(qdev_get_machine(),
  24                                               "s390-sclp-event-facility",
  25                                               NULL);
  26     assert(op);
  27     return op->opaque;
  28 }
  29
  30 /* Provide information about the configuration, CPUs and storage */
  31 static void read_SCP_info(SCCB *sccb)
  32 {
  33     ReadInfo *read_info = (ReadInfo *) sccb;
  34     int shift = 0;
  35
  36     while ((ram_size >> (20 + shift)) > 65535) {
  37         shift++;
  38     }
  39     read_info->rnmax = cpu_to_be16(ram_size >> (20 + shift));
  40     read_info->rnsize = 1 << shift;
  41     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
  42 }
  43
  44 static void sclp_execute(SCCB *sccb, uint64_t code)
  45 {
  46     S390SCLPDevice *sdev = get_event_facility();
  47
  48     switch (code) {
  49     case SCLP_CMDW_READ_SCP_INFO:
  50     case SCLP_CMDW_READ_SCP_INFO_FORCED:
  51         read_SCP_info(sccb);
  52         break;
  53     default:
  54         sdev->sclp_command_handler(sdev->ef, sccb, code);
  55         break;
  56     }
  57 }
  58
  59 int sclp_service_call(uint32_t sccb, uint64_t code)
  60 {
  61     int r = 0;
  62     SCCB work_sccb;
  63
  64     hwaddr sccb_len = sizeof(SCCB);
  65
  66     /* first some basic checks on program checks */
  67     if (cpu_physical_memory_is_io(sccb)) {
  68         r = -PGM_ADDRESSING;
  69         goto out;
  70     }
  71     if (sccb & ~0x7ffffff8ul) {
  72         r = -PGM_SPECIFICATION;
  73         goto out;
  74     }
  75
  76     /*
  77      * we want to work on a private copy of the sccb, to prevent guests
  78      * from playing dirty tricks by modifying the memory content after
  79      * the host has checked the values
  80      */
  81     cpu_physical_memory_read(sccb, &work_sccb, sccb_len);
  82
  83     /* Valid sccb sizes */
  84     if (be16_to_cpu(work_sccb.h.length) < sizeof(SCCBHeader) ||
  85         be16_to_cpu(work_sccb.h.length) > SCCB_SIZE) {
  86         r = -PGM_SPECIFICATION;
  87         goto out;
  88     }
  89
  90     sclp_execute((SCCB *)&work_sccb, code);
  91
  92     cpu_physical_memory_write(sccb, &work_sccb,
  93                               be16_to_cpu(work_sccb.h.length));
  94
  95     sclp_service_interrupt(sccb);
  96
  97 out:
  98     return r;
  99 }
 100
 101 void sclp_service_interrupt(uint32_t sccb)
 102 {
 103     S390SCLPDevice *sdev = get_event_facility();
 104     uint32_t param = sccb & ~3;
 105
 106     /* Indicate whether an event is still pending */
 107     param |= sdev->event_pending(sdev->ef) ? 1 : 0;
 108
 109     if (!param) {
 110         /* No need to send an interrupt, there's nothing to be notified about */
 111         return;
 112     }
 113     s390_sclp_extint(param);
 114 }
 115
 116 /* qemu object creation and initialization functions */
 117
 118 void s390_sclp_init(void)
 119 {
 120     DeviceState *dev  = qdev_create(NULL, "s390-sclp-event-facility");
 121
 122     object_property_add_child(qdev_get_machine(), "s390-sclp-event-facility",
 123                               OBJECT(dev), NULL);
 124     qdev_init_nofail(dev);
 125 }
 126
 127 static int s390_sclp_dev_init(SysBusDevice *dev)
 128 {
 129     int r;
 130     S390SCLPDevice *sdev = (S390SCLPDevice *)dev;
 131     S390SCLPDeviceClass *sclp = SCLP_S390_DEVICE_GET_CLASS(dev);
 132
 133     r = sclp->init(sdev);
 134     if (!r) {
 135         assert(sdev->event_pending);
 136         assert(sdev->sclp_command_handler);
 137     }
 138
 139     return r;
 140 }
 141
 142 static void s390_sclp_device_class_init(ObjectClass *klass, void *data)
 143 {
 144     SysBusDeviceClass *dc = SYS_BUS_DEVICE_CLASS(klass);
 145
 146     dc->init = s390_sclp_dev_init;
 147 }
 148
 149 static const TypeInfo s390_sclp_device_info = {
 150     .name = TYPE_DEVICE_S390_SCLP,
 151     .parent = TYPE_SYS_BUS_DEVICE,
 152     .instance_size = sizeof(S390SCLPDevice),
 153     .class_init = s390_sclp_device_class_init,
 154     .class_size = sizeof(S390SCLPDeviceClass),
 155     .abstract = true,
 156 };
 157
 158 static void s390_sclp_register_types(void)
 159 {
 160     type_register_static(&s390_sclp_device_info);
 161 }
 162
 163 type_init(s390_sclp_register_types)