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/*
* QEMU S390 IPL Block
*
* Copyright 2015 IBM Corp.
* Author(s): Alexander Yarygin <yarygin@linux.vnet.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or (at
* your option) any later version. See the COPYING file in the top-level
* directory.
*/
#ifndef IPLB_H
#define IPLB_H
#define LOADPARM_LEN 8
struct IplBlockCcw {
uint8_t reserved0[85];
uint8_t ssid;
uint16_t devno;
uint8_t vm_flags;
uint8_t reserved3[3];
uint32_t vm_parm_len;
uint8_t nss_name[8];
uint8_t vm_parm[64];
uint8_t reserved4[8];
} __attribute__ ((packed));
typedef struct IplBlockCcw IplBlockCcw;
struct IplBlockFcp {
uint8_t reserved1[305 - 1];
uint8_t opt;
uint8_t reserved2[3];
uint16_t reserved3;
uint16_t devno;
uint8_t reserved4[4];
uint64_t wwpn;
uint64_t lun;
uint32_t bootprog;
uint8_t reserved5[12];
uint64_t br_lba;
uint32_t scp_data_len;
uint8_t reserved6[260];
uint8_t scp_data[];
} __attribute__ ((packed));
typedef struct IplBlockFcp IplBlockFcp;
struct IplBlockQemuScsi {
uint32_t lun;
uint16_t target;
uint16_t channel;
uint8_t reserved0[77];
uint8_t ssid;
uint16_t devno;
} __attribute__ ((packed));
typedef struct IplBlockQemuScsi IplBlockQemuScsi;
struct IplParameterBlock {
uint32_t len;
uint8_t reserved0[3];
uint8_t version;
uint32_t blk0_len;
uint8_t pbt;
uint8_t flags;
uint16_t reserved01;
uint8_t loadparm[LOADPARM_LEN];
union {
IplBlockCcw ccw;
IplBlockFcp fcp;
IplBlockQemuScsi scsi;
};
} __attribute__ ((packed));
typedef struct IplParameterBlock IplParameterBlock;
extern IplParameterBlock iplb __attribute__((__aligned__(PAGE_SIZE)));
#define QIPL_ADDRESS 0xcc
/* Boot Menu flags */
#define QIPL_FLAG_BM_OPTS_CMD 0x80
#define QIPL_FLAG_BM_OPTS_ZIPL 0x40
/*
* This definition must be kept in sync with the definition
* in hw/s390x/ipl.h
*/
struct QemuIplParameters {
uint8_t qipl_flags;
uint8_t reserved1[3];
uint64_t netboot_start_addr;
uint32_t boot_menu_timeout;
uint8_t reserved2[12];
} __attribute__ ((packed));
typedef struct QemuIplParameters QemuIplParameters;
extern QemuIplParameters qipl;
#define S390_IPL_TYPE_FCP 0x00
#define S390_IPL_TYPE_CCW 0x02
#define S390_IPL_TYPE_QEMU_SCSI 0xff
static inline bool manage_iplb(IplParameterBlock *iplb, bool store)
{
register unsigned long addr asm("0") = (unsigned long) iplb;
register unsigned long rc asm("1") = 0;
unsigned long subcode = store ? 6 : 5;
asm volatile ("diag %0,%2,0x308\n"
: "+d" (addr), "+d" (rc)
: "d" (subcode)
: "memory", "cc");
return rc == 0x01;
}
static inline bool store_iplb(IplParameterBlock *iplb)
{
return manage_iplb(iplb, true);
}
static inline bool set_iplb(IplParameterBlock *iplb)
{
return manage_iplb(iplb, false);
}
#endif /* IPLB_H */
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