s390-ccw: refactor boot map table code
Some ECKD bootmap code was using structs designed for SCSI. Even though this works, it confuses readability. Add a new BootMapTable struct to assist with readability in bootmap entry code. Also: - replace ScsiMbr in ECKD code with appropriate structs - fix read_block messages to reflect BootMapTable - fixup ipl_scsi to use BootMapTable (referred to as Program Table) - defined value for maximum table entries Signed-off-by: Collin L. Walling <walling@linux.vnet.ibm.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Collin L. Walling
Thomas Huth
parent
0a773d55ac
commit
5340eb072f
@ -182,24 +182,24 @@ static block_number_t load_eckd_segments(block_number_t blk, uint64_t *address)
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return block_nr;
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}
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static void run_eckd_boot_script(block_number_t mbr_block_nr)
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static void run_eckd_boot_script(block_number_t bmt_block_nr)
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{
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int i;
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unsigned int loadparm = get_loadparm_index();
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block_number_t block_nr;
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uint64_t address;
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ScsiMbr *bte = (void *)sec; /* Eckd bootmap table entry */
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BootMapTable *bmt = (void *)sec;
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BootMapScript *bms = (void *)sec;
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debug_print_int("loadparm", loadparm);
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IPL_assert(loadparm < 31, "loadparm value greater than"
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IPL_assert(loadparm <= MAX_TABLE_ENTRIES, "loadparm value greater than"
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" maximum number of boot entries allowed");
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memset(sec, FREE_SPACE_FILLER, sizeof(sec));
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read_block(mbr_block_nr, sec, "Cannot read MBR");
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read_block(bmt_block_nr, sec, "Cannot read Boot Map Table");
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block_nr = eckd_block_num((void *)&(bte->blockptr[loadparm]));
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IPL_assert(block_nr != -1, "No Boot Map");
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block_nr = eckd_block_num(&bmt->entry[loadparm]);
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IPL_assert(block_nr != -1, "Cannot find Boot Map Table Entry");
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memset(sec, FREE_SPACE_FILLER, sizeof(sec));
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read_block(block_nr, sec, "Cannot read Boot Map Script");
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@ -223,7 +223,7 @@ static void ipl_eckd_cdl(void)
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XEckdMbr *mbr;
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Ipl2 *ipl2 = (void *)sec;
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IplVolumeLabel *vlbl = (void *)sec;
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block_number_t block_nr;
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block_number_t bmt_block_nr;
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/* we have just read the block #0 and recognized it as "IPL1" */
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sclp_print("CDL\n");
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@ -238,8 +238,8 @@ static void ipl_eckd_cdl(void)
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IPL_assert(mbr->dev_type == DEV_TYPE_ECKD,
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"Non-ECKD device type in zIPL section of IPL2 record.");
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/* save pointer to Boot Script */
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block_nr = eckd_block_num((void *)&(mbr->blockptr));
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/* save pointer to Boot Map Table */
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bmt_block_nr = eckd_block_num(&mbr->blockptr);
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memset(sec, FREE_SPACE_FILLER, sizeof(sec));
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read_block(2, vlbl, "Cannot read Volume Label at block 2");
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@ -249,7 +249,7 @@ static void ipl_eckd_cdl(void)
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"Invalid magic of volser block");
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print_volser(vlbl->f.volser);
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run_eckd_boot_script(block_nr);
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run_eckd_boot_script(bmt_block_nr);
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/* no return */
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}
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@ -280,7 +280,7 @@ static void print_eckd_ldl_msg(ECKD_IPL_mode_t mode)
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static void ipl_eckd_ldl(ECKD_IPL_mode_t mode)
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{
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block_number_t block_nr;
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block_number_t bmt_block_nr;
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BootInfo *bip = (void *)(sec + 0x70); /* BootInfo is MBR for LDL */
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if (mode != ECKD_LDL_UNLABELED) {
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@ -299,8 +299,10 @@ static void ipl_eckd_ldl(ECKD_IPL_mode_t mode)
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}
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verify_boot_info(bip);
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block_nr = eckd_block_num((void *)&(bip->bp.ipl.bm_ptr.eckd.bptr));
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run_eckd_boot_script(block_nr);
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/* save pointer to Boot Map Table */
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bmt_block_nr = eckd_block_num((void *)&bip->bp.ipl.bm_ptr.eckd.bptr);
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run_eckd_boot_script(bmt_block_nr);
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/* no return */
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}
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@ -325,7 +327,7 @@ static void print_eckd_msg(void)
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static void ipl_eckd(void)
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{
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ScsiMbr *mbr = (void *)sec;
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XEckdMbr *mbr = (void *)sec;
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LDL_VTOC *vlbl = (void *)sec;
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print_eckd_msg();
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@ -449,10 +451,8 @@ static void zipl_run(ScsiBlockPtr *pte)
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static void ipl_scsi(void)
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{
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ScsiMbr *mbr = (void *)sec;
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uint8_t *ns, *ns_end;
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int program_table_entries = 0;
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const int pte_len = sizeof(ScsiBlockPtr);
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ScsiBlockPtr *prog_table_entry = NULL;
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BootMapTable *prog_table = (void *)sec;
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unsigned int loadparm = get_loadparm_index();
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/* Grab the MBR */
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@ -467,34 +467,28 @@ static void ipl_scsi(void)
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debug_print_int("MBR Version", mbr->version_id);
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IPL_check(mbr->version_id == 1,
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"Unknown MBR layout version, assuming version 1");
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debug_print_int("program table", mbr->blockptr[0].blockno);
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IPL_assert(mbr->blockptr[0].blockno, "No Program Table");
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debug_print_int("program table", mbr->pt.blockno);
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IPL_assert(mbr->pt.blockno, "No Program Table");
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/* Parse the program table */
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read_block(mbr->blockptr[0].blockno, sec,
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"Error reading Program Table");
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read_block(mbr->pt.blockno, sec, "Error reading Program Table");
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IPL_assert(magic_match(sec, ZIPL_MAGIC), "No zIPL magic in PT");
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debug_print_int("loadparm index", loadparm);
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ns_end = sec + virtio_get_block_size();
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for (ns = (sec + pte_len); (ns + pte_len) < ns_end; ns += pte_len) {
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prog_table_entry = (ScsiBlockPtr *)ns;
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if (!prog_table_entry->blockno) {
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while (program_table_entries <= MAX_TABLE_ENTRIES) {
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if (!prog_table->entry[program_table_entries].scsi.blockno) {
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break;
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}
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program_table_entries++;
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if (program_table_entries == loadparm + 1) {
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break; /* selected entry found */
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}
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}
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debug_print_int("program table entries", program_table_entries);
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IPL_assert(program_table_entries != 0, "Empty Program Table");
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zipl_run(prog_table_entry); /* no return */
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debug_print_int("loadparm", loadparm);
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IPL_assert(loadparm <= MAX_TABLE_ENTRIES, "loadparm value greater than"
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" maximum number of boot entries allowed");
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zipl_run(&prog_table->entry[loadparm].scsi); /* no return */
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}
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/***********************************************************************
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@ -53,6 +53,15 @@ typedef union BootMapPointer {
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ExtEckdBlockPtr xeckd;
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} __attribute__ ((packed)) BootMapPointer;
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#define MAX_TABLE_ENTRIES 30
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/* aka Program Table */
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typedef struct BootMapTable {
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uint8_t magic[4];
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uint8_t reserved[12];
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BootMapPointer entry[];
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} __attribute__ ((packed)) BootMapTable;
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typedef struct ComponentEntry {
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ScsiBlockPtr data;
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uint8_t pad[7];
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@ -70,7 +79,7 @@ typedef struct ScsiMbr {
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uint8_t magic[4];
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uint32_t version_id;
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uint8_t reserved[8];
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ScsiBlockPtr blockptr[];
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ScsiBlockPtr pt; /* block pointer to program table */
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} __attribute__ ((packed)) ScsiMbr;
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#define ZIPL_MAGIC "zIPL"
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