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zipl: List-Directed IPL from ECKD DASD

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Make zipl tool prepare ECKD DASD for booting by different IPL
programs (with the same boot record installed).

Besides standard CCW-type IPL, user gets an ability to trigger
(with the same boot record installed!) List-Directed IPL. This
allows to use the feature of secure boot from ECKD DASD (which
is not available for CCW-type IPL).

When using the old boot interfaces, the usual CCW-type IPL is
triggered for DASD. Also for compatibility reasons zipl(8) tool
is modified to create and install one, or two "similar" program
tables per boot partition, depending on job and disk type. The
"similar" program tables differ only in block pointers format.
The old IPL programs (CCW-type IPL) use program table based on the
old format.

All program tables are packed to the same bootmap file. Their
order and logical offsets in the file are not significant (not
used by anyone).

The picture below shows which program table is used for IPL of
specified type from disk of specified type. Here "0" and "1" are
identifiers of program tables based on the old and new block
pointers format respectively. E.g. program table "0" is used for
CCW-type IPL from ECKD DASD. LD-IPL from DASD FBA is unsupported
(respectively, only one program table "0" is used), etc.

                            CCW-IPL   LD-IPL

 SCSI                          X        0
 DASD FBA                      0        X
 ECKD DASD LDL                 0        X
 ECKD DASD CDL                 0        1

Signed-off-by: Eduard Shishkin <edward6@linux.ibm.com>
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Eduard Shishkin
2022-11-22 13:31:40 +01:00
committed by Jan Höppner
parent cf5f373142
commit f7d2339c6a
14 changed files with 1100 additions and 637 deletions
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include/boot/boot_defs.h
+44 -1
View File
@@ -57,11 +57,41 @@ struct linear_blockptr {
uint8_t reserved[4];
} __packed;
/*
* Format of a boot record on ECKD DASD for List-Directed IPL
*/
struct eckd_boot_record {
uint8_t magic[4];
uint32_t version_id;
uint8_t unused[8];
uint8_t program_table_pointer[16];
uint8_t reserved[478];
uint16_t os_id;
} __packed;
/*
* Layout of block pointer for cylinder/head/sector devices
* e.g. ECKD
*/
struct eckd_blockptr {
enum blkptr_format_id {
/*
* this is the old format which serves only CCW-type IPL,
* and doesn't fit List-Directed IPL. Still supported for
* compatibility reasons.
*/
LEGACY_BLKPTR_FORMAT_ID,
/*
* this is the "new" format which serves only List-Directed IPL,
* but is also suitable for CCW-type IPL.
*/
BLKPTR_FORMAT_ID
};
/*
* Block pointers format identified as LEGACY_BLKPTR_FORMAT_ID.
*/
struct eckd_blockptr_legacy {
uint16_t cyl;
uint16_t head;
uint8_t sec;
@@ -70,6 +100,18 @@ struct eckd_blockptr {
uint8_t reserved[8];
} __packed;
/*
* Block pointers format identified as BLKPTR_FORMAT_ID.
*/
struct eckd_blockptr {
uint32_t cyl;
uint8_t head;
uint8_t sec;
uint8_t reserved1[4];
uint16_t blockct;
uint8_t reserved2[4];
} __packed;
typedef enum {
COMPONENT_TYPE_EXECUTE = 0x01,
COMPONENT_TYPE_LOAD = 0x02,
@@ -153,6 +195,7 @@ struct boot_info_bp_dump {
struct boot_info_bp_ipl {
union {
struct eckd_blockptr_legacy eckd_legacy;
struct eckd_blockptr eckd;
struct linear_blockptr lin;
} bm_ptr;