pc-bios/s390-ccw/iplb.h

   1 /*
   2  * QEMU S390 IPL Block
   3  *
   4  * Copyright 2015 IBM Corp.
   5  * Author(s): Alexander Yarygin <yarygin@linux.vnet.ibm.com>
   6  *
   7  * This work is licensed under the terms of the GNU GPL, version 2 or (at
   8  * your option) any later version. See the COPYING file in the top-level
   9  * directory.
  10  */
  11
  12 #ifndef IPLB_H
  13 #define IPLB_H
  14
  15 struct IplBlockCcw {
  16     uint8_t  reserved0[85];
  17     uint8_t  ssid;
  18     uint16_t devno;
  19     uint8_t  vm_flags;
  20     uint8_t  reserved3[3];
  21     uint32_t vm_parm_len;
  22     uint8_t  nss_name[8];
  23     uint8_t  vm_parm[64];
  24     uint8_t  reserved4[8];
  25 } __attribute__ ((packed));
  26 typedef struct IplBlockCcw IplBlockCcw;
  27
  28 struct IplBlockFcp {
  29     uint8_t  reserved1[305 - 1];
  30     uint8_t  opt;
  31     uint8_t  reserved2[3];
  32     uint16_t reserved3;
  33     uint16_t devno;
  34     uint8_t  reserved4[4];
  35     uint64_t wwpn;
  36     uint64_t lun;
  37     uint32_t bootprog;
  38     uint8_t  reserved5[12];
  39     uint64_t br_lba;
  40     uint32_t scp_data_len;
  41     uint8_t  reserved6[260];
  42     uint8_t  scp_data[];
  43 } __attribute__ ((packed));
  44 typedef struct IplBlockFcp IplBlockFcp;
  45
  46 struct IplBlockQemuScsi {
  47     uint32_t lun;
  48     uint16_t target;
  49     uint16_t channel;
  50     uint8_t  reserved0[77];
  51     uint8_t  ssid;
  52     uint16_t devno;
  53 } __attribute__ ((packed));
  54 typedef struct IplBlockQemuScsi IplBlockQemuScsi;
  55
  56 struct IplParameterBlock {
  57     uint32_t len;
  58     uint8_t  reserved0[3];
  59     uint8_t  version;
  60     uint32_t blk0_len;
  61     uint8_t  pbt;
  62     uint8_t  flags;
  63     uint16_t reserved01;
  64     uint8_t  loadparm[8];
  65     union {
  66         IplBlockCcw ccw;
  67         IplBlockFcp fcp;
  68         IplBlockQemuScsi scsi;
  69     };
  70 } __attribute__ ((packed));
  71 typedef struct IplParameterBlock IplParameterBlock;
  72
  73 extern IplParameterBlock iplb __attribute__((__aligned__(PAGE_SIZE)));
  74
  75 #define S390_IPL_TYPE_FCP 0x00
  76 #define S390_IPL_TYPE_CCW 0x02
  77 #define S390_IPL_TYPE_QEMU_SCSI 0xff
  78
  79 static inline bool store_iplb(IplParameterBlock *iplb)
  80 {
  81     register unsigned long addr asm("0") = (unsigned long) iplb;
  82     register unsigned long rc asm("1") = 0;
  83
  84     asm volatile ("diag %0,%2,0x308\n"
  85                   : "+d" (addr), "+d" (rc)
  86                   : "d" (6)
  87                   : "memory", "cc");
  88     return rc == 0x01;
  89 }
  90
  91 #endif /* IPLB_H */