diff options
Diffstat (limited to 'hw/s390x/sclp.c')
| -rw-r--r-- | hw/s390x/sclp.c | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c new file mode 100644 index 0000000000..5c274fa03d --- /dev/null +++ b/hw/s390x/sclp.c @@ -0,0 +1,163 @@ +/* + * SCLP Support + * + * Copyright IBM, Corp. 2012 + * + * Authors: + * Christian Borntraeger <borntraeger@de.ibm.com> + * Heinz Graalfs <graalfs@linux.vnet.ibm.com> + * + * This work is licensed under the terms of the GNU GPL, version 2 or (at your + * option) any later version. See the COPYING file in the top-level directory. + * + */ + +#include "cpu.h" +#include "kvm.h" +#include "memory.h" + +#include "sclp.h" + +static inline S390SCLPDevice *get_event_facility(void) +{ + ObjectProperty *op = object_property_find(qdev_get_machine(), + "s390-sclp-event-facility", + NULL); + assert(op); + return op->opaque; +} + +/* Provide information about the configuration, CPUs and storage */ +static void read_SCP_info(SCCB *sccb) +{ + ReadInfo *read_info = (ReadInfo *) sccb; + int shift = 0; + + while ((ram_size >> (20 + shift)) > 65535) { + shift++; + } + read_info->rnmax = cpu_to_be16(ram_size >> (20 + shift)); + read_info->rnsize = 1 << shift; + sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION); +} + +static void sclp_execute(SCCB *sccb, uint64_t code) +{ + S390SCLPDevice *sdev = get_event_facility(); + + switch (code) { + case SCLP_CMDW_READ_SCP_INFO: + case SCLP_CMDW_READ_SCP_INFO_FORCED: + read_SCP_info(sccb); + break; + default: + sdev->sclp_command_handler(sdev->ef, sccb, code); + break; + } +} + +int sclp_service_call(uint32_t sccb, uint64_t code) +{ + int r = 0; + SCCB work_sccb; + + hwaddr sccb_len = sizeof(SCCB); + + /* first some basic checks on program checks */ + if (cpu_physical_memory_is_io(sccb)) { + r = -PGM_ADDRESSING; + goto out; + } + if (sccb & ~0x7ffffff8ul) { + r = -PGM_SPECIFICATION; + goto out; + } + + /* + * we want to work on a private copy of the sccb, to prevent guests + * from playing dirty tricks by modifying the memory content after + * the host has checked the values + */ + cpu_physical_memory_read(sccb, &work_sccb, sccb_len); + + /* Valid sccb sizes */ + if (be16_to_cpu(work_sccb.h.length) < sizeof(SCCBHeader) || + be16_to_cpu(work_sccb.h.length) > SCCB_SIZE) { + r = -PGM_SPECIFICATION; + goto out; + } + + sclp_execute((SCCB *)&work_sccb, code); + + cpu_physical_memory_write(sccb, &work_sccb, + be16_to_cpu(work_sccb.h.length)); + + sclp_service_interrupt(sccb); + +out: + return r; +} + +void sclp_service_interrupt(uint32_t sccb) +{ + S390SCLPDevice *sdev = get_event_facility(); + uint32_t param = sccb & ~3; + + /* Indicate whether an event is still pending */ + param |= sdev->event_pending(sdev->ef) ? 1 : 0; + + if (!param) { + /* No need to send an interrupt, there's nothing to be notified about */ + return; + } + s390_sclp_extint(param); +} + +/* qemu object creation and initialization functions */ + +void s390_sclp_init(void) +{ + DeviceState *dev = qdev_create(NULL, "s390-sclp-event-facility"); + + object_property_add_child(qdev_get_machine(), "s390-sclp-event-facility", + OBJECT(dev), NULL); + qdev_init_nofail(dev); +} + +static int s390_sclp_dev_init(SysBusDevice *dev) +{ + int r; + S390SCLPDevice *sdev = (S390SCLPDevice *)dev; + S390SCLPDeviceClass *sclp = SCLP_S390_DEVICE_GET_CLASS(dev); + + r = sclp->init(sdev); + if (!r) { + assert(sdev->event_pending); + assert(sdev->sclp_command_handler); + } + + return r; +} + +static void s390_sclp_device_class_init(ObjectClass *klass, void *data) +{ + SysBusDeviceClass *dc = SYS_BUS_DEVICE_CLASS(klass); + + dc->init = s390_sclp_dev_init; +} + +static TypeInfo s390_sclp_device_info = { + .name = TYPE_DEVICE_S390_SCLP, + .parent = TYPE_SYS_BUS_DEVICE, + .instance_size = sizeof(S390SCLPDevice), + .class_init = s390_sclp_device_class_init, + .class_size = sizeof(S390SCLPDeviceClass), + .abstract = true, +}; + +static void s390_sclp_register_types(void) +{ + type_register_static(&s390_sclp_device_info); +} + +type_init(s390_sclp_register_types) |