[PATCH v7 14/29] pc-bios/s390-ccw: Define memory for IPLB and convert IPLB to pointers

[Zhuoying Cai <zycai@linux.ibm.com>]

Define a memory space for both IPL Parameter Block (IPLB) and
IPL Information Report Block (IIRB) since IIRB is stored immediately
following IPLB.

Convert IPLB to pointer and it points to the start of the defined memory space.
IIRB points to the end of IPLB.

Signed-off-by: Zhuoying Cai <zycai@linux.ibm.com>
---
 pc-bios/s390-ccw/iplb.h     | 13 +++++++++++--
 pc-bios/s390-ccw/jump2ipl.c |  6 +++---
 pc-bios/s390-ccw/main.c     | 34 +++++++++++++++++++---------------
 pc-bios/s390-ccw/netmain.c  |  8 ++++----
 4 files changed, 37 insertions(+), 24 deletions(-)

diff --git a/pc-bios/s390-ccw/iplb.h b/pc-bios/s390-ccw/iplb.h
index cc3ecc69e5..a0f58d125c 100644
--- a/pc-bios/s390-ccw/iplb.h
+++ b/pc-bios/s390-ccw/iplb.h
@@ -20,7 +20,7 @@
 #include <string.h>
 
 extern QemuIplParameters qipl;
-extern IplParameterBlock iplb __attribute__((__aligned__(PAGE_SIZE)));
+extern IplParameterBlock *iplb;
 extern bool have_iplb;
 
 struct IplInfoReportBlockHeader {
@@ -85,6 +85,15 @@ struct IplInfoReportBlock {
 };
 typedef struct IplInfoReportBlock IplInfoReportBlock;
 
+struct IplBlocks {
+    IplParameterBlock   iplb;
+    IplInfoReportBlock  iirb;
+};
+typedef struct IplBlocks IplBlocks;
+
+/* extern only allowed in header file */
+extern IplBlocks ipl_data __attribute__((__aligned__(PAGE_SIZE)));
+
 #define S390_IPL_TYPE_FCP 0x00
 #define S390_IPL_TYPE_CCW 0x02
 #define S390_IPL_TYPE_QEMU_SCSI 0xff
@@ -127,7 +136,7 @@ static inline bool load_next_iplb(void)
 
     qipl.index++;
     next_iplb = (IplParameterBlock *) qipl.next_iplb;
-    memcpy(&iplb, next_iplb, sizeof(IplParameterBlock));
+    memcpy(iplb, next_iplb, sizeof(IplParameterBlock));
 
     qipl.chain_len--;
     qipl.next_iplb = qipl.next_iplb + sizeof(IplParameterBlock);
diff --git a/pc-bios/s390-ccw/jump2ipl.c b/pc-bios/s390-ccw/jump2ipl.c
index 86321d0f46..fa2ca5cbe1 100644
--- a/pc-bios/s390-ccw/jump2ipl.c
+++ b/pc-bios/s390-ccw/jump2ipl.c
@@ -43,11 +43,11 @@ int jump_to_IPL_code(uint64_t address)
      * The IPLB for QEMU SCSI type devices must be rebuilt during re-ipl. The
      * iplb.devno is set to the boot position of the target SCSI device.
      */
-    if (iplb.pbt == S390_IPL_TYPE_QEMU_SCSI) {
-        iplb.devno = qipl.index;
+    if (iplb->pbt == S390_IPL_TYPE_QEMU_SCSI) {
+        iplb->devno = qipl.index;
     }
 
-    if (have_iplb && !set_iplb(&iplb)) {
+    if (have_iplb && !set_iplb(iplb)) {
         panic("Failed to set IPLB");
     }
 
diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c
index 76bf743900..c9328f1c51 100644
--- a/pc-bios/s390-ccw/main.c
+++ b/pc-bios/s390-ccw/main.c
@@ -22,7 +22,9 @@
 static SubChannelId blk_schid = { .one = 1 };
 static char loadparm_str[LOADPARM_LEN + 1];
 QemuIplParameters qipl;
-IplParameterBlock iplb __attribute__((__aligned__(PAGE_SIZE)));
+/* Ensure that IPLB and IIRB are page aligned and sequential in memory */
+IplBlocks ipl_data;
+IplParameterBlock *iplb;
 bool have_iplb;
 static uint16_t cutype;
 LowCore *lowcore; /* Yes, this *is* a pointer to address 0 */
@@ -51,7 +53,7 @@ void write_subsystem_identification(void)
 void write_iplb_location(void)
 {
     if (cutype == CU_TYPE_VIRTIO && virtio_get_device_type() != VIRTIO_ID_NET) {
-        lowcore->ptr_iplb = ptr2u32(&iplb);
+        lowcore->ptr_iplb = ptr2u32(iplb);
     }
 }
 
@@ -162,7 +164,7 @@ static void menu_setup(void)
         return;
     }
 
-    switch (iplb.pbt) {
+    switch (iplb->pbt) {
     case S390_IPL_TYPE_CCW:
     case S390_IPL_TYPE_QEMU_SCSI:
         menu_set_parms(qipl.qipl_flags & BOOT_MENU_FLAG_MASK,
@@ -191,8 +193,8 @@ static void boot_setup(void)
 {
     char lpmsg[] = "LOADPARM=[________]\n";
 
-    if (have_iplb && memcmp(iplb.loadparm, NO_LOADPARM, LOADPARM_LEN) != 0) {
-        ebcdic_to_ascii((char *) iplb.loadparm, loadparm_str, LOADPARM_LEN);
+    if (have_iplb && memcmp(iplb->loadparm, NO_LOADPARM, LOADPARM_LEN) != 0) {
+        ebcdic_to_ascii((char *) iplb->loadparm, loadparm_str, LOADPARM_LEN);
     } else {
         sclp_get_loadparm_ascii(loadparm_str);
     }
@@ -216,21 +218,21 @@ static bool find_boot_device(void)
     VDev *vdev = virtio_get_device();
     bool found = false;
 
-    switch (iplb.pbt) {
+    switch (iplb->pbt) {
     case S390_IPL_TYPE_CCW:
         vdev->scsi_device_selected = false;
-        debug_print_int("device no. ", iplb.ccw.devno);
-        blk_schid.ssid = iplb.ccw.ssid & 0x3;
+        debug_print_int("device no. ", iplb->ccw.devno);
+        blk_schid.ssid = iplb->ccw.ssid & 0x3;
         debug_print_int("ssid ", blk_schid.ssid);
-        found = find_subch(iplb.ccw.devno);
+        found = find_subch(iplb->ccw.devno);
         break;
     case S390_IPL_TYPE_QEMU_SCSI:
         vdev->scsi_device_selected = true;
-        vdev->selected_scsi_device.channel = iplb.scsi.channel;
-        vdev->selected_scsi_device.target = iplb.scsi.target;
-        vdev->selected_scsi_device.lun = iplb.scsi.lun;
-        blk_schid.ssid = iplb.scsi.ssid & 0x3;
-        found = find_subch(iplb.scsi.devno);
+        vdev->selected_scsi_device.channel = iplb->scsi.channel;
+        vdev->selected_scsi_device.target = iplb->scsi.target;
+        vdev->selected_scsi_device.lun = iplb->scsi.lun;
+        blk_schid.ssid = iplb->scsi.ssid & 0x3;
+        found = find_subch(iplb->scsi.devno);
         break;
     default:
         puts("Unsupported IPLB");
@@ -311,10 +313,12 @@ static void probe_boot_device(void)
 
 void main(void)
 {
+    iplb = &ipl_data.iplb;
+
     copy_qipl();
     sclp_setup();
     css_setup();
-    have_iplb = store_iplb(&iplb);
+    have_iplb = store_iplb(iplb);
     if (!have_iplb) {
         boot_setup();
         probe_boot_device();
diff --git a/pc-bios/s390-ccw/netmain.c b/pc-bios/s390-ccw/netmain.c
index a9521dff41..457fbc3095 100644
--- a/pc-bios/s390-ccw/netmain.c
+++ b/pc-bios/s390-ccw/netmain.c
@@ -528,11 +528,11 @@ static bool virtio_setup(void)
      */
     enable_mss_facility();
 
-    if (have_iplb || store_iplb(&iplb)) {
-        IPL_assert(iplb.pbt == S390_IPL_TYPE_CCW, "IPL_TYPE_CCW expected");
-        dev_no = iplb.ccw.devno;
+    if (have_iplb || store_iplb(iplb)) {
+        IPL_assert(iplb->pbt == S390_IPL_TYPE_CCW, "IPL_TYPE_CCW expected");
+        dev_no = iplb->ccw.devno;
         debug_print_int("device no. ", dev_no);
-        net_schid.ssid = iplb.ccw.ssid & 0x3;
+        net_schid.ssid = iplb->ccw.ssid & 0x3;
         debug_print_int("ssid ", net_schid.ssid);
         found = find_net_dev(&schib, dev_no);
     } else {
-- 
2.51.1