Commit 69333c36 authored by Jason J. Herne's avatar Jason J. Herne Committed by Thomas Huth
Browse files

s390-bios: Add channel command codes/structs needed for dasd-ipl 



The dasd IPL procedure needs to execute a few previously unused
channel commands. Let's define them and their associated data
structures.

Signed-off-by: default avatarJason J. Herne <jjherne@linux.ibm.com>
Acked-by: default avatarCornelia Huck <cohuck@redhat.com>
Acked-by: default avatarThomas Huth <thuth@redhat.com>
Message-Id: <1554388475-18329-15-git-send-email-jjherne@linux.ibm.com>
Signed-off-by: default avatarThomas Huth <thuth@redhat.com>
parent 3668cb7c

pc-bios/s390-ccw/cio.h

+23 −0
Original line number Diff line number Diff line
@@ -200,11 +200,14 @@ typedef struct ccw1 { 
#define CCW_FLAG_IDA             0x04

#define CCW_FLAG_SUSPEND         0x02



/* Common CCW commands */

#define CCW_CMD_READ_IPL         0x02

#define CCW_CMD_NOOP             0x03

#define CCW_CMD_BASIC_SENSE      0x04

#define CCW_CMD_TIC              0x08

#define CCW_CMD_SENSE_ID         0xe4



/* Virtio CCW commands */

#define CCW_CMD_SET_VQ           0x13

#define CCW_CMD_VDEV_RESET       0x33

#define CCW_CMD_READ_FEAT        0x12
@@ -216,6 +219,12 @@ typedef struct ccw1 { 
#define CCW_CMD_SET_CONF_IND     0x53

#define CCW_CMD_READ_VQ_CONF     0x32



/* DASD CCW commands */

#define CCW_CMD_DASD_READ             0x06

#define CCW_CMD_DASD_SEEK             0x07

#define CCW_CMD_DASD_SEARCH_ID_EQ     0x31

#define CCW_CMD_DASD_READ_MT          0x86



/*

 * Command-mode operation request block

 */
@@ -333,6 +342,20 @@ typedef struct irb { 
    __u32 emw[8];

}  __attribute__ ((packed, aligned(4))) Irb;



/* Used for SEEK ccw commands */

typedef struct CcwSeekData {

    uint16_t reserved;

    uint16_t cyl;

    uint16_t head;

} __attribute__((packed)) CcwSeekData;



/* Used for SEARCH ID ccw commands */

typedef struct CcwSearchIdData {

    uint16_t cyl;

    uint16_t head;

    uint8_t record;

} __attribute__((packed)) CcwSearchIdData;



int enable_mss_facility(void);

void enable_subchannel(SubChannelId schid);

uint16_t cu_type(SubChannelId schid);