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qemu/pc-bios/s390-ccw/bootmap.h
Jared Rossi 806315279d pc-bios/s390-ccw: Remove panics from ECKD IPL path 
Remove panic-on-error from ECKD block device IPL specific functions so that
error recovery may be possible in the future.

Functions that would previously panic now provide a return code.

Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20241020012953.1380075-9-jrossi@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
2024-10-23 06:53:44 +02:00

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/*
* QEMU S390 bootmap interpreter -- declarations
*
* Copyright 2014 IBM Corp.
* Author(s): Eugene (jno) Dvurechenski <jno@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 _PC_BIOS_S390_CCW_BOOTMAP_H
#define _PC_BIOS_S390_CCW_BOOTMAP_H
#include "s390-ccw.h"
#include "virtio.h"
typedef uint64_t block_number_t;
#define NULL_BLOCK_NR 0xffffffffffffffffULL
#define ERROR_BLOCK_NR 0xfffffffffffffffeULL
#define FREE_SPACE_FILLER '\xAA'
typedef struct ScsiBlockPtr {
uint64_t blockno;
uint16_t size;
uint16_t blockct;
uint8_t reserved[4];
} __attribute__ ((packed)) ScsiBlockPtr;
typedef struct FbaBlockPtr {
uint32_t blockno;
uint16_t size;
uint16_t blockct;
} __attribute__ ((packed)) FbaBlockPtr;
typedef struct EckdCHS {
uint16_t cylinder;
uint16_t head;
uint8_t sector;
} __attribute__ ((packed)) EckdCHS;
typedef struct EckdBlockPtr {
EckdCHS chs; /* cylinder/head/sector is an address of the block */
uint16_t size;
uint8_t count; /* (size_in_blocks-1);
* it's 0 for TablePtr, ScriptPtr, and SectionPtr */
} __attribute__ ((packed)) EckdBlockPtr;
typedef struct LdEckdCHS {
uint32_t cylinder;
uint8_t head;
uint8_t sector;
} __attribute__ ((packed)) LdEckdCHS;
typedef struct LdEckdBlockPtr {
LdEckdCHS chs; /* cylinder/head/sector is an address of the block */
uint8_t reserved[4];
uint16_t count;
uint32_t pad;
} __attribute__ ((packed)) LdEckdBlockPtr;
/* bptr is used for CCW type IPL, while ldptr is for list-directed IPL */
typedef union ExtEckdBlockPtr {
EckdBlockPtr bptr;
LdEckdBlockPtr ldptr;
} __attribute__ ((packed)) ExtEckdBlockPtr;
typedef union BootMapPointer {
ScsiBlockPtr scsi;
FbaBlockPtr fba;
EckdBlockPtr eckd;
ExtEckdBlockPtr xeckd;
} __attribute__ ((packed)) BootMapPointer;
typedef struct BootRecord {
uint8_t magic[4];
uint32_t version;
uint64_t res1;
BootMapPointer pgt;
uint8_t reserved[510 - 32];
uint16_t os_id;
} __attribute__ ((packed)) BootRecord;
/* aka Program Table */
typedef struct BootMapTable {
uint8_t magic[4];
uint8_t reserved[12];
BootMapPointer entry[];
} __attribute__ ((packed)) BootMapTable;
typedef union ComponentEntryData {
uint64_t load_psw;
uint64_t load_addr;
} ComponentEntryData;
typedef struct ComponentEntry {
ScsiBlockPtr data;
uint8_t pad[7];
uint8_t component_type;
ComponentEntryData compdat;
} __attribute((packed)) ComponentEntry;
typedef struct ComponentHeader {
uint8_t magic[4]; /* == "zIPL" */
uint8_t type; /* == ZIPL_COMP_HEADER_* */
uint8_t reserved[27];
} __attribute((packed)) ComponentHeader;
typedef struct ScsiMbr {
uint8_t magic[4];
uint32_t version_id;
uint8_t reserved[8];
ScsiBlockPtr pt; /* block pointer to program table */
} __attribute__ ((packed)) ScsiMbr;
#define ZIPL_MAGIC "zIPL"
#define ZIPL_MAGIC_EBCDIC "\xa9\xc9\xd7\xd3"
#define IPL1_MAGIC "\xc9\xd7\xd3\xf1" /* == "IPL1" in EBCDIC */
#define IPL2_MAGIC "\xc9\xd7\xd3\xf2" /* == "IPL2" in EBCDIC */
#define VOL1_MAGIC "\xe5\xd6\xd3\xf1" /* == "VOL1" in EBCDIC */
#define LNX1_MAGIC "\xd3\xd5\xe7\xf1" /* == "LNX1" in EBCDIC */
#define CMS1_MAGIC "\xc3\xd4\xe2\xf1" /* == "CMS1" in EBCDIC */
#define LDL1_VERSION '\x40' /* == ' ' in EBCDIC */
#define LDL2_VERSION '\xf2' /* == '2' in EBCDIC */
#define ZIPL_COMP_HEADER_IPL 0x00
#define ZIPL_COMP_HEADER_DUMP 0x01
#define ZIPL_COMP_ENTRY_EXEC 0x01
#define ZIPL_COMP_ENTRY_LOAD 0x02
#define ZIPL_COMP_ENTRY_SIGNATURE 0x03
typedef struct XEckdMbr {
uint8_t magic[4]; /* == "xIPL" */
uint8_t version;
uint8_t bp_type;
uint8_t dev_type; /* == DEV_TYPE_* */
#define DEV_TYPE_ECKD 0x00
#define DEV_TYPE_FBA 0x01
uint8_t flags;
BootMapPointer blockptr;
uint8_t reserved[8];
} __attribute__ ((packed)) XEckdMbr; /* see also BootInfo */
typedef struct BootMapScriptEntry {
BootMapPointer blkptr;
uint8_t pad[7];
uint8_t type; /* == BOOT_SCRIPT_* */
#define BOOT_SCRIPT_EXEC 0x01
#define BOOT_SCRIPT_LOAD 0x02
#define BOOT_SCRIPT_SIGNATURE 0x03
union {
uint64_t load_address;
uint64_t load_psw;
} address;
} __attribute__ ((packed)) BootMapScriptEntry;
typedef struct BootMapScriptHeader {
uint32_t magic;
uint8_t type;
#define BOOT_SCRIPT_HDR_IPL 0x00
uint8_t reserved[27];
} __attribute__ ((packed)) BootMapScriptHeader;
typedef struct BootMapScript {
BootMapScriptHeader header;
BootMapScriptEntry entry[];
} __attribute__ ((packed)) BootMapScript;
/*
* These aren't real VTOCs, but referred to this way in some docs.
* They are "volume labels" actually.
*
* Some structures looks similar to described above, but left
* separate as there is no indication that they are the same.
* So, the value definitions are left separate too.
*/
typedef struct LDL_VTOC { /* @ rec.3 cyl.0 trk.0 for ECKD */
char magic[4]; /* "LNX1", EBCDIC */
char volser[6]; /* volser, EBCDIC */
uint8_t reserved[69]; /* reserved, 0x40 */
uint8_t LDL_version; /* 0x40 or 0xF2 */
uint64_t formatted_blocks; /* if LDL_version >= 0xF2 */
} __attribute__ ((packed)) LDL_VTOC;
typedef struct format_date {
uint8_t YY;
uint8_t MM;
uint8_t DD;
uint8_t hh;
uint8_t mm;
uint8_t ss;
} __attribute__ ((packed)) format_date_t;
typedef struct CMS_VTOC { /* @ rec.3 cyl.0 trk.0 for ECKD */
/* @ blk.1 (zero based) for FBA */
char magic[4]; /* 'CMS1', EBCDIC */
char volser[6]; /* volser, EBCDIC */
uint16_t version; /* = 0 */
uint32_t block_size; /* = 512, 1024, 2048, or 4096 */
uint32_t disk_origin; /* = 4 or 5 */
uint32_t blocks; /* Number of usable cyls/blocks */
uint32_t formatted; /* Max number of fmtd cyls/blks */
uint32_t CMS_blocks; /* disk size in CMS blocks */
uint32_t CMS_used; /* Number of CMS blocks in use */
uint32_t FST_size; /* = 64, bytes */
uint32_t FST_per_CMS_blk; /* */
format_date_t format_date; /* YYMMDDhhmmss as 6 bytes */
uint8_t reserved1[2]; /* = 0 */
uint32_t offset; /* disk offset when reserved */
uint32_t next_hole; /* block nr */
uint32_t HBLK_hole_offset; /* >> HBLK data of next hole */
uint32_t alloc_map_usr_off; /* >> user part of Alloc map */
uint8_t reserved2[4]; /* = 0 */
char shared_seg_name[8]; /* */
} __attribute__ ((packed)) CMS_VTOC;
/* from zipl/include/boot.h */
typedef struct BootInfoBpIpl {
union {
ExtEckdBlockPtr eckd;
ScsiBlockPtr linr;
} bm_ptr;
uint8_t unused[16];
} __attribute__ ((packed)) BootInfoBpIpl;
typedef struct EckdDumpParam {
uint32_t start_blk;
uint32_t end_blk;
uint16_t blocksize;
uint8_t num_heads;
uint8_t bpt;
char reserved[4];
} __attribute((packed, may_alias)) EckdDumpParam;
typedef struct FbaDumpParam {
uint64_t start_blk;
uint64_t blockct;
} __attribute((packed)) FbaDumpParam;
typedef struct BootInfoBpDump {
union {
EckdDumpParam eckd;
FbaDumpParam fba;
} param;
uint8_t unused[16];
} __attribute__ ((packed)) BootInfoBpDump;
typedef struct BootInfo { /* @ 0x70, record #0 */
unsigned char magic[4]; /* = 'zIPL', ASCII */
uint8_t version; /* = 1 */
#define BOOT_INFO_VERSION 1
uint8_t bp_type; /* = 0 */
#define BOOT_INFO_BP_TYPE_IPL 0x00
#define BOOT_INFO_BP_TYPE_DUMP 0x01
uint8_t dev_type; /* = 0 */
#define BOOT_INFO_DEV_TYPE_ECKD 0x00
#define BOOT_INFO_DEV_TYPE_FBA 0x01
uint8_t flags; /* = 1 */
#ifdef __s390x__
#define BOOT_INFO_FLAGS_ARCH 0x01
#else
#define BOOT_INFO_FLAGS_ARCH 0x00
#endif
union {
BootInfoBpDump dump;
BootInfoBpIpl ipl;
} bp;
} __attribute__ ((packed)) BootInfo; /* see also XEckdMbr */
/*
* Structs for IPL
*/
#define STAGE2_BLK_CNT_MAX 24 /* Stage 1b can load up to 24 blocks */
typedef struct EckdCdlIpl1 {
uint8_t key[4]; /* == "IPL1" */
uint8_t data[24];
} __attribute__((packed)) EckdCdlIpl1;
typedef struct EckdSeekArg {
uint16_t pad;
EckdCHS chs;
uint8_t pad2;
} __attribute__ ((packed)) EckdSeekArg;
typedef struct EckdStage1b {
uint8_t reserved[32 * STAGE2_BLK_CNT_MAX];
struct EckdSeekArg seek[STAGE2_BLK_CNT_MAX];
uint8_t unused[64];
} __attribute__ ((packed)) EckdStage1b;
typedef struct EckdStage1 {
uint8_t reserved[72];
struct EckdSeekArg seek[2];
} __attribute__ ((packed)) EckdStage1;
typedef struct EckdCdlIpl2 {
uint8_t key[4]; /* == "IPL2" */
struct EckdStage1 stage1;
XEckdMbr mbr;
uint8_t reserved[24];
} __attribute__((packed)) EckdCdlIpl2;
typedef struct EckdLdlIpl1 {
uint8_t reserved[24];
struct EckdStage1 stage1;
BootInfo bip; /* BootInfo is MBR for LDL */
} __attribute__((packed)) EckdLdlIpl1;
typedef struct IplVolumeLabel {
unsigned char key[4]; /* == "VOL1" */
union {
unsigned char data[80];
struct {
unsigned char key[4]; /* == "VOL1" */
unsigned char volser[6];
unsigned char reserved[64];
EckdCHS br; /* Location of Boot Record for list-directed IPL */
} f;
};
} __attribute__((packed)) IplVolumeLabel;
typedef enum {
ECKD_NO_IPL,
ECKD_CMS,
ECKD_LDL,
ECKD_LDL_UNLABELED,
} ECKD_IPL_mode_t;
/* utility code below */
static inline void print_volser(const void *volser)
{
char ascii[8];
ebcdic_to_ascii((char *)volser, ascii, 6);
ascii[6] = '\0';
printf("VOLSER=[%s]\n", ascii);
}
static inline bool unused_space(const void *p, size_t size)
{
size_t i;
const unsigned char *m = p;
for (i = 0; i < size; i++) {
if (m[i] != FREE_SPACE_FILLER) {
return false;
}
}
return true;
}
static inline bool is_null_block_number(block_number_t x)
{
return x == NULL_BLOCK_NR;
}
static inline void read_block(block_number_t blockno,
void *buffer,
const char *errmsg)
{
IPL_assert(virtio_read(blockno, buffer) == 0, errmsg);
}
static inline bool block_size_ok(uint32_t block_size)
{
return block_size == virtio_get_block_size();
}
static inline bool magic_match(const void *data, const void *magic)
{
return *((uint32_t *)data) == *((uint32_t *)magic);
}
static inline uint32_t iso_733_to_u32(uint64_t x)
{
return (uint32_t)x;
}
#define ISO_SECTOR_SIZE 2048
/* El Torito specifies boot image size in 512 byte blocks */
#define ET_SECTOR_SHIFT 2
#define ISO_PRIMARY_VD_SECTOR 16
static inline int read_iso_boot_image(uint32_t block_offset, void *load_addr,
uint32_t blks_to_load)
{
if (virtio_read_many(block_offset, load_addr, blks_to_load)) {
puts("Failed to read boot image!");
return -1;
}
return 0;
}
#define ISO9660_MAX_DIR_DEPTH 8
typedef struct IsoDirHdr {
uint8_t dr_len;
uint8_t ear_len;
uint64_t ext_loc;
uint64_t data_len;
uint8_t recording_datetime[7];
uint8_t file_flags;
uint8_t file_unit_size;
uint8_t gap_size;
uint32_t vol_seqnum;
uint8_t fileid_len;
} __attribute__((packed)) IsoDirHdr;
typedef struct IsoVdElTorito {
uint8_t el_torito[32]; /* must contain el_torito_magic value */
uint8_t unused0[32];
uint32_t bc_offset;
uint8_t unused1[1974];
} __attribute__((packed)) IsoVdElTorito;
typedef struct IsoVdPrimary {
uint8_t unused1;
uint8_t sys_id[32];
uint8_t vol_id[32];
uint8_t unused2[8];
uint64_t vol_space_size;
uint8_t unused3[32];
uint32_t vol_set_size;
uint32_t vol_seqnum;
uint32_t log_block_size;
uint64_t path_table_size;
uint32_t l_path_table;
uint32_t opt_l_path_table;
uint32_t m_path_table;
uint32_t opt_m_path_table;
IsoDirHdr rootdir;
uint8_t root_null;
uint8_t reserved2[1858];
} __attribute__((packed)) IsoVdPrimary;
typedef struct IsoVolDesc {
uint8_t type;
uint8_t ident[5];
uint8_t version;
union {
IsoVdElTorito boot;
IsoVdPrimary primary;
} vd;
} __attribute__((packed)) IsoVolDesc;
#define VOL_DESC_TYPE_BOOT 0
#define VOL_DESC_TYPE_PRIMARY 1
#define VOL_DESC_TYPE_SUPPLEMENT 2
#define VOL_DESC_TYPE_PARTITION 3
#define VOL_DESC_TERMINATOR 255
typedef struct IsoBcValid {
uint8_t platform_id;
uint16_t reserved;
uint8_t id[24];
uint16_t checksum;
uint8_t key[2];
} __attribute__((packed)) IsoBcValid;
typedef struct IsoBcSection {
uint8_t boot_type;
uint16_t load_segment;
uint8_t sys_type;
uint8_t unused;
uint16_t sector_count;
uint32_t load_rba;
uint8_t selection[20];
} __attribute__((packed)) IsoBcSection;
typedef struct IsoBcHdr {
uint8_t platform_id;
uint16_t sect_num;
uint8_t id[28];
} __attribute__((packed)) IsoBcHdr;
typedef struct IsoBcEntry {
uint8_t id;
union {
IsoBcValid valid; /* id == 0x01 */
IsoBcSection sect; /* id == 0x88 || id == 0x0 */
IsoBcHdr hdr; /* id == 0x90 || id == 0x91 */
} body;
} __attribute__((packed)) IsoBcEntry;
#define ISO_BC_ENTRY_PER_SECTOR (ISO_SECTOR_SIZE / sizeof(IsoBcEntry))
#define ISO_BC_HDR_VALIDATION 0x01
#define ISO_BC_BOOTABLE_SECTION 0x88
#define ISO_BC_MAGIC_55 0x55
#define ISO_BC_MAGIC_AA 0xaa
#define ISO_BC_PLATFORM_X86 0x0
#define ISO_BC_PLATFORM_PPC 0x1
#define ISO_BC_PLATFORM_MAC 0x2
static inline bool is_iso_bc_valid(IsoBcEntry *e)
{
IsoBcValid *v = &e->body.valid;
if (e->id != ISO_BC_HDR_VALIDATION) {
return false;
}
if (v->platform_id != ISO_BC_PLATFORM_X86 &&
v->platform_id != ISO_BC_PLATFORM_PPC &&
v->platform_id != ISO_BC_PLATFORM_MAC) {
return false;
}
return v->key[0] == ISO_BC_MAGIC_55 &&
v->key[1] == ISO_BC_MAGIC_AA &&
v->reserved == 0x0;
}
#endif /* _PC_BIOS_S390_CCW_BOOTMAP_H */
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