pc-bios: s390x: Use PSW masks where possible and introduce PSW_MASK_SHORT_ADDR

Let's move some of the PSW mask defines into s390-arch.h and use them
in jump2ipl.c. Also let's introduce a new constant for the address
mask of 8 byte (short) PSWs.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20200624075226.92728-8-frankja@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

diff --git a/pc-bios/s390-ccw/jump2ipl.c b/pc-bios/s390-ccw/jump2ipl.c
index 4eba2510b045ff06157ca550285605768a3b372a..767012bf0c9f587e2f479369d68ad82b94fa55ae 100644 (file)
--- a/pc-bios/s390-ccw/jump2ipl.c
+++ b/pc-bios/s390-ccw/jump2ipl.c
@@ -8,12 +8,10 @@
 
 #include "libc.h"
 #include "s390-ccw.h"
+#include "s390-arch.h"
 
 #define KERN_IMAGE_START 0x010000UL
-#define PSW_MASK_64 0x0000000100000000ULL
-#define PSW_MASK_32 0x0000000080000000ULL
-#define PSW_MASK_SHORTPSW 0x0008000000000000ULL
-#define RESET_PSW_MASK (PSW_MASK_SHORTPSW | PSW_MASK_32 | PSW_MASK_64)
+#define RESET_PSW_MASK (PSW_MASK_SHORTPSW | PSW_MASK_64)
 
 typedef struct ResetInfo {
     uint64_t ipl_psw;
@@ -54,7 +52,7 @@ void jump_to_IPL_code(uint64_t address)
 
     current->ipl_psw = (uint64_t) &jump_to_IPL_2;
     current->ipl_psw |= RESET_PSW_MASK;
-    current->ipl_continue = address & 0x7fffffff;
+    current->ipl_continue = address & PSW_MASK_SHORT_ADDR;
 
     debug_print_int("set IPL addr to", current->ipl_continue);
 
@@ -86,7 +84,7 @@ void jump_to_low_kernel(void)
 
     /* Trying to get PSW at zero address */
     if (*((uint64_t *)0) & RESET_PSW_MASK) {
-        jump_to_IPL_code((*((uint64_t *)0)) & 0x7fffffff);
+        jump_to_IPL_code((*((uint64_t *)0)) & PSW_MASK_SHORT_ADDR);
     }
 
     /* No other option left, so use the Linux kernel start address */

diff --git a/pc-bios/s390-ccw/s390-arch.h b/pc-bios/s390-ccw/s390-arch.h
index 73852029d4e92cd9cf467aaf4638907d6365d189..6da44d4436c75b550a927bf2628a94b726365bcc 100644 (file)
--- a/pc-bios/s390-ccw/s390-arch.h
+++ b/pc-bios/s390-ccw/s390-arch.h
@@ -26,9 +26,11 @@ _Static_assert(sizeof(struct PSWLegacy) == 8, "PSWLegacy size incorrect");
 
 /* s390 psw bit masks */
 #define PSW_MASK_IOINT      0x0200000000000000ULL
+#define PSW_MASK_SHORTPSW   0x0008000000000000ULL
 #define PSW_MASK_WAIT       0x0002000000000000ULL
 #define PSW_MASK_EAMODE     0x0000000100000000ULL
 #define PSW_MASK_BAMODE     0x0000000080000000ULL
+#define PSW_MASK_SHORT_ADDR 0x000000007fffffffULL
 #define PSW_MASK_64         (PSW_MASK_EAMODE | PSW_MASK_BAMODE)
 
 /* Low core mapping */