diff options
Diffstat (limited to 'hw')
| -rw-r--r-- | hw/s390x/Makefile.objs | 1 | ||||
| -rw-r--r-- | hw/s390x/sclp.c | 118 | ||||
| -rw-r--r-- | hw/s390x/sclp.h | 76 |
3 files changed, 195 insertions, 0 deletions
diff --git a/hw/s390x/Makefile.objs b/hw/s390x/Makefile.objs index dcdcac8a81..1c14b96687 100644 --- a/hw/s390x/Makefile.objs +++ b/hw/s390x/Makefile.objs @@ -1,3 +1,4 @@ obj-y = s390-virtio-bus.o s390-virtio.o obj-y := $(addprefix ../,$(obj-y)) +obj-y += sclp.o diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c new file mode 100644 index 0000000000..d902a66261 --- /dev/null +++ b/hw/s390x/sclp.c @@ -0,0 +1,118 @@ +/* + * 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" + +/* 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) +{ + switch (code) { + case SCLP_CMDW_READ_SCP_INFO: + case SCLP_CMDW_READ_SCP_INFO_FORCED: + read_SCP_info(sccb); + break; + default: + sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND); + 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) +{ + s390_sclp_extint(sccb & ~3); +} + +/* qemu object creation and initialization functions */ + +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) diff --git a/hw/s390x/sclp.h b/hw/s390x/sclp.h new file mode 100644 index 0000000000..e9ad42bec2 --- /dev/null +++ b/hw/s390x/sclp.h @@ -0,0 +1,76 @@ +/* + * SCLP Support + * + * Copyright IBM, Corp. 2012 + * + * Authors: + * Christian Borntraeger <borntraeger@de.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. + * + */ + +#ifndef HW_S390_SCLP_H +#define HW_S390_SCLP_H + +#include <hw/sysbus.h> +#include <hw/qdev.h> + +/* SCLP command codes */ +#define SCLP_CMDW_READ_SCP_INFO 0x00020001 +#define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001 + +/* SCLP response codes */ +#define SCLP_RC_NORMAL_READ_COMPLETION 0x0010 +#define SCLP_RC_INVALID_SCLP_COMMAND 0x01f0 + +/* Service Call Control Block (SCCB) and its elements */ + +#define SCCB_SIZE 4096 + +/* + * Normally packed structures are not the right thing to do, since all code + * must take care of endianess. We cant use ldl_phys and friends for two + * reasons, though: + * - some of the embedded structures below the SCCB can appear multiple times + * at different locations, so there is no fixed offset + * - we work on a private copy of the SCCB, since there are several length + * fields, that would cause a security nightmare if we allow the guest to + * alter the structure while we parse it. We cannot use ldl_p and friends + * either without doing pointer arithmetics + * So we have to double check that all users of sclp data structures use the + * right endianess wrappers. + */ +typedef struct SCCBHeader { + uint16_t length; + uint8_t function_code; + uint8_t control_mask[3]; + uint16_t response_code; +} QEMU_PACKED SCCBHeader; + +#define SCCB_DATA_LEN (SCCB_SIZE - sizeof(SCCBHeader)) + +typedef struct ReadInfo { + SCCBHeader h; + uint16_t rnmax; + uint8_t rnsize; +} QEMU_PACKED ReadInfo; + +typedef struct SCCB { + SCCBHeader h; + char data[SCCB_DATA_LEN]; + } QEMU_PACKED SCCB; + +typedef struct S390SCLPDevice { + SysBusDevice busdev; +} S390SCLPDevice; + +typedef struct S390SCLPDeviceClass { + DeviceClass qdev; + int (*init)(S390SCLPDevice *sdev); +} S390SCLPDeviceClass; + +void sclp_service_interrupt(uint32_t sccb); + +#endif |