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 IplBlockQemuScsi { 47 uint32_t lun; 48 uint16_t target; 49 uint16_t channel; 50 uint8_t reserved0[77]; 51 uint8_t ssid; 52 uint16_t devno; 53 } __attribute__ ((packed)); 54 typedef struct IplBlockQemuScsi IplBlockQemuScsi; 55 56 struct IplParameterBlock { 57 uint32_t len; 58 uint8_t reserved0[3]; 59 uint8_t version; 60 uint32_t blk0_len; 61 uint8_t pbt; 62 uint8_t flags; 63 uint16_t reserved01; 64 uint8_t loadparm[8]; 65 union { 66 IplBlockCcw ccw; 67 IplBlockFcp fcp; 68 IplBlockQemuScsi scsi; 69 }; 70 } __attribute__ ((packed)); 71 typedef struct IplParameterBlock IplParameterBlock; 72 73 extern IplParameterBlock iplb __attribute__((__aligned__(PAGE_SIZE))); 74 75 #define S390_IPL_TYPE_FCP 0x00 76 #define S390_IPL_TYPE_CCW 0x02 77 #define S390_IPL_TYPE_QEMU_SCSI 0xff 78 79 static inline bool store_iplb(IplParameterBlock *iplb) 80 { 81 register unsigned long addr asm("0") = (unsigned long) iplb; 82 register unsigned long rc asm("1") = 0; 83 84 asm volatile ("diag %0,%2,0x308\n" 85 : "+d" (addr), "+d" (rc) 86 : "d" (6) 87 : "memory", "cc"); 88 return rc == 0x01; 89 } 90 91 #endif /* IPLB_H */ 92