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
  15#define LOADPARM_LEN    8
  16
  17struct 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));
  28typedef struct IplBlockCcw IplBlockCcw;
  29
  30struct 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));
  46typedef struct IplBlockFcp IplBlockFcp;
  47
  48struct 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));
  56typedef struct IplBlockQemuScsi IplBlockQemuScsi;
  57
  58struct 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));
  73typedef struct IplParameterBlock IplParameterBlock;
  74
  75extern 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 */
  87struct 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));
  94typedef struct QemuIplParameters QemuIplParameters;
  95
  96extern 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
 102static 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
 116static inline bool store_iplb(IplParameterBlock *iplb)
 117{
 118    return manage_iplb(iplb, true);
 119}
 120
 121static inline bool set_iplb(IplParameterBlock *iplb)
 122{
 123    return manage_iplb(iplb, false);
 124}
 125
 126#endif /* IPLB_H */
 127