s390/IPL: Allow boot from other ssid than 0

[qemu.git] / pc-bios / s390-ccw / main.c

diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c
index 0913aac5c196ad166d2f7475861d089789434fe6..c5d533231b903f1fd1991c37ca6379d7019a4042 100644 (file)
--- a/pc-bios/s390-ccw/main.c
+++ b/pc-bios/s390-ccw/main.c
@@ -12,29 +12,50 @@
 
 struct subchannel_id blk_schid;
 char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE)));
+uint64_t boot_value;
 
 void virtio_panic(const char *string)
 {
     sclp_print(string);
+    disabled_wait();
     while (1) { }
 }
 
-static void virtio_setup(void)
+static void virtio_setup(uint64_t dev_info)
 {
-    struct irb irb;
+    struct schib schib;
     int i;
     int r;
     bool found = false;
-
+    bool check_devno = false;
+    uint16_t dev_no = -1;
     blk_schid.one = 1;
 
+    if (dev_info != -1) {
+        check_devno = true;
+        dev_no = dev_info & 0xffff;
+        debug_print_int("device no. ", dev_no);
+        blk_schid.ssid = (dev_info >> 16) & 0x3;
+        if (blk_schid.ssid != 0) {
+            debug_print_int("ssid ", blk_schid.ssid);
+            if (enable_mss_facility() != 0) {
+                virtio_panic("Failed to enable mss facility\n");
+            }
+        }
+    }
+
     for (i = 0; i < 0x10000; i++) {
         blk_schid.sch_no = i;
-        r = tsch(blk_schid, &irb);
-        if (r != 3) {
-            if (virtio_is_blk(blk_schid)) {
-                found = true;
-                break;
+        r = stsch_err(blk_schid, &schib);
+        if (r == 3) {
+            break;
+        }
+        if (schib.pmcw.dnv) {
+            if (!check_devno || (schib.pmcw.dev == dev_no)) {
+                if (virtio_is_blk(blk_schid)) {
+                    found = true;
+                    break;
+                }
             }
         }
     }
@@ -49,8 +70,11 @@ static void virtio_setup(void)
 int main(void)
 {
     sclp_setup();
-    virtio_setup();
+    debug_print_int("boot reg[7] ", boot_value);
+    virtio_setup(boot_value);
+
     if (zipl_load() < 0)
         sclp_print("Failed to load OS from hard disk\n");
+    disabled_wait();
     while (1) { }
 }