77 lines
2.0 KiB
C
77 lines
2.0 KiB
C
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/*
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* SCLP Support
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*
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* Copyright IBM, Corp. 2012
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*
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* Authors:
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* Christian Borntraeger <borntraeger@de.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at your
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* option) any later version. See the COPYING file in the top-level directory.
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*
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*/
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#ifndef HW_S390_SCLP_H
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#define HW_S390_SCLP_H
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#include <hw/sysbus.h>
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#include <hw/qdev.h>
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/* SCLP command codes */
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#define SCLP_CMDW_READ_SCP_INFO 0x00020001
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#define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001
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/* SCLP response codes */
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#define SCLP_RC_NORMAL_READ_COMPLETION 0x0010
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#define SCLP_RC_INVALID_SCLP_COMMAND 0x01f0
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/* Service Call Control Block (SCCB) and its elements */
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#define SCCB_SIZE 4096
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/*
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* Normally packed structures are not the right thing to do, since all code
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* must take care of endianess. We cant use ldl_phys and friends for two
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* reasons, though:
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* - some of the embedded structures below the SCCB can appear multiple times
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* at different locations, so there is no fixed offset
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* - we work on a private copy of the SCCB, since there are several length
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* fields, that would cause a security nightmare if we allow the guest to
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* alter the structure while we parse it. We cannot use ldl_p and friends
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* either without doing pointer arithmetics
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* So we have to double check that all users of sclp data structures use the
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* right endianess wrappers.
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*/
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typedef struct SCCBHeader {
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uint16_t length;
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uint8_t function_code;
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uint8_t control_mask[3];
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uint16_t response_code;
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} QEMU_PACKED SCCBHeader;
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#define SCCB_DATA_LEN (SCCB_SIZE - sizeof(SCCBHeader))
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typedef struct ReadInfo {
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SCCBHeader h;
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uint16_t rnmax;
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uint8_t rnsize;
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} QEMU_PACKED ReadInfo;
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typedef struct SCCB {
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SCCBHeader h;
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char data[SCCB_DATA_LEN];
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} QEMU_PACKED SCCB;
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typedef struct S390SCLPDevice {
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SysBusDevice busdev;
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} S390SCLPDevice;
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typedef struct S390SCLPDeviceClass {
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DeviceClass qdev;
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int (*init)(S390SCLPDevice *sdev);
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} S390SCLPDeviceClass;
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void sclp_service_interrupt(uint32_t sccb);
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#endif
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