63d8b5ace3
We currently pass an integer as the subcode parameter. However,
the upper bits of the register containing the subcode need to
be 0, which is not guaranteed unless we explicitly specify the
subcode to be an unsigned long value.
Fixes: d046c51dad ("pc-bios/s390-ccw: Get device address via diag 308/6")
Cc: qemu-stable@nongnu.org
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Tested-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
125 lines
2.9 KiB
C
125 lines
2.9 KiB
C
/*
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* QEMU S390 IPL Block
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*
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* Copyright 2015 IBM Corp.
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* Author(s): Alexander Yarygin <yarygin@linux.vnet.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
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* your option) any later version. See the COPYING file in the top-level
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* directory.
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*/
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#ifndef IPLB_H
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#define IPLB_H
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struct IplBlockCcw {
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uint8_t reserved0[85];
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uint8_t ssid;
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uint16_t devno;
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uint8_t vm_flags;
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uint8_t reserved3[3];
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uint32_t vm_parm_len;
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uint8_t nss_name[8];
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uint8_t vm_parm[64];
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uint8_t reserved4[8];
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} __attribute__ ((packed));
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typedef struct IplBlockCcw IplBlockCcw;
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struct IplBlockFcp {
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uint8_t reserved1[305 - 1];
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uint8_t opt;
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uint8_t reserved2[3];
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uint16_t reserved3;
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uint16_t devno;
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uint8_t reserved4[4];
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uint64_t wwpn;
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uint64_t lun;
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uint32_t bootprog;
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uint8_t reserved5[12];
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uint64_t br_lba;
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uint32_t scp_data_len;
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uint8_t reserved6[260];
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uint8_t scp_data[];
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} __attribute__ ((packed));
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typedef struct IplBlockFcp IplBlockFcp;
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struct IplBlockQemuScsi {
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uint32_t lun;
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uint16_t target;
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uint16_t channel;
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uint8_t reserved0[77];
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uint8_t ssid;
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uint16_t devno;
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} __attribute__ ((packed));
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typedef struct IplBlockQemuScsi IplBlockQemuScsi;
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struct IplParameterBlock {
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uint32_t len;
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uint8_t reserved0[3];
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uint8_t version;
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uint32_t blk0_len;
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uint8_t pbt;
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uint8_t flags;
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uint16_t reserved01;
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uint8_t loadparm[8];
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union {
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IplBlockCcw ccw;
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IplBlockFcp fcp;
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IplBlockQemuScsi scsi;
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};
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} __attribute__ ((packed));
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typedef struct IplParameterBlock IplParameterBlock;
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extern IplParameterBlock iplb __attribute__((__aligned__(PAGE_SIZE)));
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#define QIPL_ADDRESS 0xcc
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/* Boot Menu flags */
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#define QIPL_FLAG_BM_OPTS_CMD 0x80
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#define QIPL_FLAG_BM_OPTS_ZIPL 0x40
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/*
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* This definition must be kept in sync with the defininition
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* in hw/s390x/ipl.h
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*/
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struct QemuIplParameters {
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uint8_t qipl_flags;
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uint8_t reserved1[3];
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uint64_t netboot_start_addr;
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uint32_t boot_menu_timeout;
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uint8_t reserved2[12];
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} __attribute__ ((packed));
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typedef struct QemuIplParameters QemuIplParameters;
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extern QemuIplParameters qipl;
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#define S390_IPL_TYPE_FCP 0x00
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#define S390_IPL_TYPE_CCW 0x02
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#define S390_IPL_TYPE_QEMU_SCSI 0xff
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static inline bool manage_iplb(IplParameterBlock *iplb, bool store)
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{
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register unsigned long addr asm("0") = (unsigned long) iplb;
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register unsigned long rc asm("1") = 0;
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unsigned long subcode = store ? 6 : 5;
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asm volatile ("diag %0,%2,0x308\n"
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: "+d" (addr), "+d" (rc)
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: "d" (subcode)
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: "memory", "cc");
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return rc == 0x01;
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}
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static inline bool store_iplb(IplParameterBlock *iplb)
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{
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return manage_iplb(iplb, true);
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}
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static inline bool set_iplb(IplParameterBlock *iplb)
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{
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return manage_iplb(iplb, false);
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}
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#endif /* IPLB_H */
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