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 "kvm.h" 17 #include "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 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) 164