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 #define LOADPARM_LEN    8
  16
  17 struct IplBlockCcw {
  18     uint8_t  reserved0[85];
  19     uint8_t  ssid;
  20     uint16_t devno;
  21     uint8_t  vm_flags;
  22     uint8_t  reserved3[3];
  23     uint32_t vm_parm_len;
  24     uint8_t  nss_name[8];
  25     uint8_t  vm_parm[64];
  26     uint8_t  reserved4[8];
  27 } __attribute__ ((packed));
  28 typedef struct IplBlockCcw IplBlockCcw;
  29
  30 struct IplBlockFcp {
  31     uint8_t  reserved1[305 - 1];
  32     uint8_t  opt;
  33     uint8_t  reserved2[3];
  34     uint16_t reserved3;
  35     uint16_t devno;
  36     uint8_t  reserved4[4];
  37     uint64_t wwpn;
  38     uint64_t lun;
  39     uint32_t bootprog;
  40     uint8_t  reserved5[12];
  41     uint64_t br_lba;
  42     uint32_t scp_data_len;
  43     uint8_t  reserved6[260];
  44     uint8_t  scp_data[];
  45 } __attribute__ ((packed));
  46 typedef struct IplBlockFcp IplBlockFcp;
  47
  48 struct IplBlockQemuScsi {
  49     uint32_t lun;
  50     uint16_t target;
  51     uint16_t channel;
  52     uint8_t  reserved0[77];
  53     uint8_t  ssid;
  54     uint16_t devno;
  55 } __attribute__ ((packed));
  56 typedef struct IplBlockQemuScsi IplBlockQemuScsi;
  57
  58 struct IplParameterBlock {
  59     uint32_t len;
  60     uint8_t  reserved0[3];
  61     uint8_t  version;
  62     uint32_t blk0_len;
  63     uint8_t  pbt;
  64     uint8_t  flags;
  65     uint16_t reserved01;
  66     uint8_t  loadparm[LOADPARM_LEN];
  67     union {
  68         IplBlockCcw ccw;
  69         IplBlockFcp fcp;
  70         IplBlockQemuScsi scsi;
  71     };
  72 } __attribute__ ((packed));
  73 typedef struct IplParameterBlock IplParameterBlock;
  74
  75 extern IplParameterBlock iplb __attribute__((__aligned__(PAGE_SIZE)));
  76
  77 #define QIPL_ADDRESS  0xcc
  78
  79 /* Boot Menu flags */
  80 #define QIPL_FLAG_BM_OPTS_CMD   0x80
  81 #define QIPL_FLAG_BM_OPTS_ZIPL  0x40
  82
  83 /*
  84  * This definition must be kept in sync with the defininition
  85  * in hw/s390x/ipl.h
  86  */
  87 struct QemuIplParameters {
  88     uint8_t  qipl_flags;
  89     uint8_t  reserved1[3];
  90     uint64_t netboot_start_addr;
  91     uint32_t boot_menu_timeout;
  92     uint8_t  reserved2[12];
  93 } __attribute__ ((packed));
  94 typedef struct QemuIplParameters QemuIplParameters;
  95
  96 extern QemuIplParameters qipl;
  97
  98 #define S390_IPL_TYPE_FCP 0x00
  99 #define S390_IPL_TYPE_CCW 0x02
 100 #define S390_IPL_TYPE_QEMU_SCSI 0xff
 101
 102 static inline bool manage_iplb(IplParameterBlock *iplb, bool store)
 103 {
 104     register unsigned long addr asm("0") = (unsigned long) iplb;
 105     register unsigned long rc asm("1") = 0;
 106     unsigned long subcode = store ? 6 : 5;
 107
 108     asm volatile ("diag %0,%2,0x308\n"
 109                   : "+d" (addr), "+d" (rc)
 110                   : "d" (subcode)
 111                   : "memory", "cc");
 112     return rc == 0x01;
 113 }
 114
 115
 116 static inline bool store_iplb(IplParameterBlock *iplb)
 117 {
 118     return manage_iplb(iplb, true);
 119 }
 120
 121 static inline bool set_iplb(IplParameterBlock *iplb)
 122 {
 123     return manage_iplb(iplb, false);
 124 }
 125
 126 #endif /* IPLB_H */