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     uint64_t netboot_start_addr;
  17     uint8_t  reserved0[77];
  18     uint8_t  ssid;
  19     uint16_t devno;
  20     uint8_t  vm_flags;
  21     uint8_t  reserved3[3];
  22     uint32_t vm_parm_len;
  23     uint8_t  nss_name[8];
  24     uint8_t  vm_parm[64];
  25     uint8_t  reserved4[8];
  26 } __attribute__ ((packed));
  27 typedef struct IplBlockCcw IplBlockCcw;
  28
  29 struct IplBlockFcp {
  30     uint8_t  reserved1[305 - 1];
  31     uint8_t  opt;
  32     uint8_t  reserved2[3];
  33     uint16_t reserved3;
  34     uint16_t devno;
  35     uint8_t  reserved4[4];
  36     uint64_t wwpn;
  37     uint64_t lun;
  38     uint32_t bootprog;
  39     uint8_t  reserved5[12];
  40     uint64_t br_lba;
  41     uint32_t scp_data_len;
  42     uint8_t  reserved6[260];
  43     uint8_t  scp_data[];
  44 } __attribute__ ((packed));
  45 typedef struct IplBlockFcp IplBlockFcp;
  46
  47 struct IplBlockQemuScsi {
  48     uint32_t lun;
  49     uint16_t target;
  50     uint16_t channel;
  51     uint8_t  reserved0[77];
  52     uint8_t  ssid;
  53     uint16_t devno;
  54 } __attribute__ ((packed));
  55 typedef struct IplBlockQemuScsi IplBlockQemuScsi;
  56
  57 struct IplParameterBlock {
  58     uint32_t len;
  59     uint8_t  reserved0[3];
  60     uint8_t  version;
  61     uint32_t blk0_len;
  62     uint8_t  pbt;
  63     uint8_t  flags;
  64     uint16_t reserved01;
  65     uint8_t  loadparm[8];
  66     union {
  67         IplBlockCcw ccw;
  68         IplBlockFcp fcp;
  69         IplBlockQemuScsi scsi;
  70     };
  71 } __attribute__ ((packed));
  72 typedef struct IplParameterBlock IplParameterBlock;
  73
  74 extern IplParameterBlock iplb __attribute__((__aligned__(PAGE_SIZE)));
  75
  76 #define S390_IPL_TYPE_FCP 0x00
  77 #define S390_IPL_TYPE_CCW 0x02
  78 #define S390_IPL_TYPE_QEMU_SCSI 0xff
  79
  80 static inline bool store_iplb(IplParameterBlock *iplb)
  81 {
  82     register unsigned long addr asm("0") = (unsigned long) iplb;
  83     register unsigned long rc asm("1") = 0;
  84
  85     asm volatile ("diag %0,%2,0x308\n"
  86                   : "+d" (addr), "+d" (rc)
  87                   : "d" (6)
  88                   : "memory", "cc");
  89     return rc == 0x01;
  90 }
  91
  92 #endif /* IPLB_H */