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authorEugene (jno) Dvurechenski <jno@linux.vnet.ibm.com>2014-05-19 20:13:41 +0200
committerCornelia Huck <cornelia.huck@de.ibm.com>2014-06-27 12:11:52 +0200
commite0aff4aa3f9de9ad7806910146ca5c5f0376cccb (patch)
treecf03f177961b7c877f6dfcb788b1c8ef6e7f1255 /pc-bios/s390-ccw/bootmap.c
parenta00b33d9e234b4ef3344697185219b84fca26c1a (diff)
pc-bios/s390-ccw: IPL from CDL-formatted ECKD DASD
Add code that allows us to start from ECKD DASD using the z/OS compatible disk layout (CDL), which is the most common format for ECKD DASD. Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com> Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Diffstat (limited to 'pc-bios/s390-ccw/bootmap.c')
-rw-r--r--pc-bios/s390-ccw/bootmap.c168
1 files changed, 168 insertions, 0 deletions
diff --git a/pc-bios/s390-ccw/bootmap.c b/pc-bios/s390-ccw/bootmap.c
index 3c08f82e53..beda4d61e0 100644
--- a/pc-bios/s390-ccw/bootmap.c
+++ b/pc-bios/s390-ccw/bootmap.c
@@ -74,6 +74,171 @@ static void jump_to_IPL_code(uint64_t address)
}
/***********************************************************************
+ * IPL an ECKD DASD (CDL or LDL/CMS format)
+ */
+
+static unsigned char _bprs[8*1024]; /* guessed "max" ECKD sector size */
+const int max_bprs_entries = sizeof(_bprs) / sizeof(ExtEckdBlockPtr);
+
+static bool eckd_valid_address(BootMapPointer *p)
+{
+ const uint64_t cylinder = p->eckd.cylinder
+ + ((p->eckd.head & 0xfff0) << 12);
+ const uint64_t head = p->eckd.head & 0x000f;
+
+ if (head >= virtio_get_heads()
+ || p->eckd.sector > virtio_get_sectors()
+ || p->eckd.sector <= 0) {
+ return false;
+ }
+
+ if (!virtio_guessed_disk_nature() && cylinder >= virtio_get_cylinders()) {
+ return false;
+ }
+
+ return true;
+}
+
+static block_number_t eckd_block_num(BootMapPointer *p)
+{
+ const uint64_t sectors = virtio_get_sectors();
+ const uint64_t heads = virtio_get_heads();
+ const uint64_t cylinder = p->eckd.cylinder
+ + ((p->eckd.head & 0xfff0) << 12);
+ const uint64_t head = p->eckd.head & 0x000f;
+ const block_number_t block = sectors * heads * cylinder
+ + sectors * head
+ + p->eckd.sector
+ - 1; /* block nr starts with zero */
+ return block;
+}
+
+static block_number_t load_eckd_segments(block_number_t blk, uint64_t *address)
+{
+ block_number_t block_nr;
+ int j, rc;
+ BootMapPointer *bprs = (void *)_bprs;
+ bool more_data;
+
+ memset(_bprs, FREE_SPACE_FILLER, sizeof(_bprs));
+ read_block(blk, bprs, "BPRS read failed");
+
+ do {
+ more_data = false;
+ for (j = 0;; j++) {
+ block_nr = eckd_block_num((void *)&(bprs[j].xeckd));
+ if (is_null_block_number(block_nr)) { /* end of chunk */
+ break;
+ }
+
+ /* we need the updated blockno for the next indirect entry
+ * in the chain, but don't want to advance address
+ */
+ if (j == (max_bprs_entries - 1)) {
+ break;
+ }
+
+ IPL_assert(block_size_ok(bprs[j].xeckd.bptr.size),
+ "bad chunk block size");
+ IPL_assert(eckd_valid_address(&bprs[j]), "bad chunk ECKD addr");
+
+ if ((bprs[j].xeckd.bptr.count == 0) && unused_space(&(bprs[j+1]),
+ sizeof(EckdBlockPtr))) {
+ /* This is a "continue" pointer.
+ * This ptr should be the last one in the current
+ * script section.
+ * I.e. the next ptr must point to the unused memory area
+ */
+ memset(_bprs, FREE_SPACE_FILLER, sizeof(_bprs));
+ read_block(block_nr, bprs, "BPRS continuation read failed");
+ more_data = true;
+ break;
+ }
+
+ /* Load (count+1) blocks of code at (block_nr)
+ * to memory (address).
+ */
+ rc = virtio_read_many(block_nr, (void *)(*address),
+ bprs[j].xeckd.bptr.count+1);
+ IPL_assert(rc == 0, "code chunk read failed");
+
+ *address += (bprs[j].xeckd.bptr.count+1) * virtio_get_block_size();
+ }
+ } while (more_data);
+ return block_nr;
+}
+
+static void run_eckd_boot_script(block_number_t mbr_block_nr)
+{
+ int i;
+ block_number_t block_nr;
+ uint64_t address;
+ ScsiMbr *scsi_mbr = (void *)sec;
+ BootMapScript *bms = (void *)sec;
+
+ memset(sec, FREE_SPACE_FILLER, sizeof(sec));
+ read_block(mbr_block_nr, sec, "Cannot read MBR");
+
+ block_nr = eckd_block_num((void *)&(scsi_mbr->blockptr));
+
+ memset(sec, FREE_SPACE_FILLER, sizeof(sec));
+ read_block(block_nr, sec, "Cannot read Boot Map Script");
+
+ for (i = 0; bms->entry[i].type == BOOT_SCRIPT_LOAD; i++) {
+ address = bms->entry[i].address.load_address;
+ block_nr = eckd_block_num(&(bms->entry[i].blkptr));
+
+ do {
+ block_nr = load_eckd_segments(block_nr, &address);
+ } while (block_nr != -1);
+ }
+
+ IPL_assert(bms->entry[i].type == BOOT_SCRIPT_EXEC,
+ "Unknown script entry type");
+ jump_to_IPL_code(bms->entry[i].address.load_address); /* no return */
+}
+
+static void ipl_eckd(void)
+{
+ XEckdMbr *mbr;
+ Ipl2 *ipl2 = (void *)sec;
+ IplVolumeLabel *vlbl = (void *)sec;
+ block_number_t block_nr;
+
+ sclp_print("Using ECKD scheme.\n");
+ if (virtio_guessed_disk_nature()) {
+ sclp_print("Using guessed DASD geometry.\n");
+ virtio_assume_eckd();
+ }
+ /* we have just read the block #0 and recognized it as "IPL1" */
+
+ memset(sec, FREE_SPACE_FILLER, sizeof(sec));
+ read_block(1, ipl2, "Cannot read IPL2 record at block 1");
+ IPL_assert(magic_match(ipl2, IPL2_MAGIC), "No IPL2 record");
+
+ mbr = &ipl2->u.x.mbr;
+ IPL_assert(magic_match(mbr, ZIPL_MAGIC), "No zIPL section in IPL2 record.");
+ IPL_assert(block_size_ok(mbr->blockptr.xeckd.bptr.size),
+ "Bad block size in zIPL section of IPL2 record.");
+ IPL_assert(mbr->dev_type == DEV_TYPE_ECKD,
+ "Non-ECKD device type in zIPL section of IPL2 record.");
+
+ /* save pointer to Boot Script */
+ block_nr = eckd_block_num((void *)&(mbr->blockptr));
+
+ memset(sec, FREE_SPACE_FILLER, sizeof(sec));
+ read_block(2, vlbl, "Cannot read Volume Label at block 2");
+ IPL_assert(magic_match(vlbl->key, VOL1_MAGIC),
+ "Invalid magic of volume label block");
+ IPL_assert(magic_match(vlbl->f.key, VOL1_MAGIC),
+ "Invalid magic of volser block");
+ print_volser(vlbl->f.volser);
+
+ run_eckd_boot_script(block_nr);
+ /* no return */
+}
+
+/***********************************************************************
* IPL a SCSI disk
*/
@@ -219,6 +384,9 @@ void zipl_load(void)
if (magic_match(mbr->magic, ZIPL_MAGIC)) {
ipl_scsi(); /* no return */
}
+ if (magic_match(mbr->magic, IPL1_MAGIC)) {
+ ipl_eckd(); /* CDL ECKD; no return */
+ }
virtio_panic("\n* invalid MBR magic *\n");
}