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 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)); 60 typedef struct IplParameterBlock IplParameterBlock; 61 62 extern IplParameterBlock iplb __attribute__((__aligned__(PAGE_SIZE))); 63 64 #define S390_IPL_TYPE_FCP 0x00 65 #define S390_IPL_TYPE_CCW 0x02 66 67 static 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