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 IplParameterBlock {
  47     uint32_t len;
  48     uint8_t  reserved0[3];
  49     uint8_t  version;
  50     uint32_t blk0_len;
  51     uint8_t  pbt;
  52     uint8_t  flags;
  53     uint16_t reserved01;
  54     uint8_t  loadparm[8];
  55     union {
  56         IplBlockCcw ccw;
  57         IplBlockFcp fcp;
  58     };
  59 } __attribute__ ((packed));
  60 typedef struct IplParameterBlock IplParameterBlock;
  61
  62 extern IplParameterBlock iplb __attribute__((__aligned__(PAGE_SIZE)));
  63
  64 #define S390_IPL_TYPE_FCP 0x00
  65 #define S390_IPL_TYPE_CCW 0x02
  66
  67 static inline bool store_iplb(IplParameterBlock *iplb)
  68 {
  69     register unsigned long addr asm("0") = (unsigned long) iplb;
  70     register unsigned long rc asm("1") = 0;
  71
  72     asm volatile ("diag %0,%2,0x308\n"
  73                   : "+d" (addr), "+d" (rc)
  74                   : "d" (6)
  75                   : "memory", "cc");
  76     return rc == 0x01;
  77 }
  78
  79 #endif /* IPLB_H */