LXR qemu/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
  15struct 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));
  26typedef struct IplBlockCcw IplBlockCcw;
  27
  28struct 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));
  44typedef struct IplBlockFcp IplBlockFcp;
  45
  46struct 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));
  60typedef struct IplParameterBlock IplParameterBlock;
  61
  62extern IplParameterBlock iplb __attribute__((__aligned__(PAGE_SIZE)));
  63
  64#define S390_IPL_TYPE_FCP 0x00
  65#define S390_IPL_TYPE_CCW 0x02
  66
  67static 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 */
  80