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From: Janosch Frank <frankja@linux.ibm.com>
To: qemu-devel@nongnu.org
Cc: borntraeger@de.ibm.com, thuth@redhat.com, cohuck@redhat.com,
	david@redhat.com
Subject: [PATCH 3/7] pc-bios: s390x: Remove unneeded dasd-ipl.c reset psw mask changes
Date: Wed, 15 Jul 2020 05:40:41 -0400	[thread overview]
Message-ID: <20200715094045.381984-4-frankja@linux.ibm.com> (raw)
In-Reply-To: <20200715094045.381984-1-frankja@linux.ibm.com>

jump_to_low_kernel() and the functions that it calls will already or
64 bit addressing into the reset psw mask when executing
jump_to_IPL_2() after the diag308 subcode 1.

The kernel proper is then branched to rather than doing a full PSW
change.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 pc-bios/s390-ccw/dasd-ipl.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/pc-bios/s390-ccw/dasd-ipl.c b/pc-bios/s390-ccw/dasd-ipl.c
index 0fc879bb8e..e8f2846740 100644
--- a/pc-bios/s390-ccw/dasd-ipl.c
+++ b/pc-bios/s390-ccw/dasd-ipl.c
@@ -206,7 +206,6 @@ static void run_ipl2(SubChannelId schid, uint16_t cutype, uint32_t addr)
  */
 void dasd_ipl(SubChannelId schid, uint16_t cutype)
 {
-    PSWLegacy *pswl = (PSWLegacy *) 0x00;
     uint32_t ipl2_addr;
 
     /* Construct Read IPL CCW and run it to read IPL1 from boot disk */
@@ -229,7 +228,5 @@ void dasd_ipl(SubChannelId schid, uint16_t cutype)
     run_ipl2(schid, cutype, ipl2_addr);
 
     /* Transfer control to the guest operating system */
-    pswl->mask |= PSW_MASK_EAMODE;   /* Force z-mode */
-    pswl->addr |= PSW_MASK_BAMODE;   /* ...          */
     jump_to_low_kernel();
 }
-- 
2.25.1



  parent reply	other threads:[~2020-07-15  9:43 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-15  9:40 [PATCH 0/7] pc-bios: s390x: Cleanup part 2 Janosch Frank
2020-07-15  9:40 ` [PATCH 1/7] pc-bios: s390x: Fix bootmap.c zipl component entry data handling Janosch Frank
2020-07-17 15:05   ` Thomas Huth
2020-07-22  6:50   ` Christian Borntraeger
2020-07-22  7:30     ` Janosch Frank
2020-07-22  7:33       ` Christian Borntraeger
2020-07-22  8:06         ` Janosch Frank
2020-07-15  9:40 ` [PATCH 2/7] pc-bios: s390x: Cleanup jump to ipl code Janosch Frank
2020-07-17 15:13   ` Thomas Huth
2020-07-21 13:07     ` Janosch Frank
2020-07-21 13:54     ` Christian Borntraeger
2020-07-15  9:40 ` Janosch Frank [this message]
2020-07-20 11:45   ` [PATCH 3/7] pc-bios: s390x: Remove unneeded dasd-ipl.c reset psw mask changes Thomas Huth
2020-07-20 12:16     ` Janosch Frank
2020-07-21  7:10       ` Thomas Huth
2020-07-15  9:40 ` [PATCH 4/7] pc-bios: s390x: Rework data initialization Janosch Frank
2020-07-20 11:56   ` Thomas Huth
2020-07-20 12:10     ` Janosch Frank
2020-07-15  9:40 ` [PATCH 5/7] pc-bios: s390x: Replace lowcore offsets with pointers in dasd-ipl.c Janosch Frank
2020-07-21  7:00   ` Thomas Huth
2020-07-15  9:40 ` [PATCH 6/7] pc-bios: s390x: Use PSW constants in start.S Janosch Frank
2020-07-21  7:05   ` Thomas Huth
2020-07-22  6:47     ` Christian Borntraeger
2020-07-15  9:40 ` [PATCH 7/7] pc-bios: s390x: Setup io and ext new psws only once Janosch Frank
2020-07-15 13:13   ` Janosch Frank
2020-07-15 13:16     ` Christian Borntraeger
2020-07-15 14:08       ` [PATCH] pc-bios: s390x: Add a comment to the io and external new PSW setup Janosch Frank
2020-07-21  7:03         ` Thomas Huth
2020-07-22  6:43         ` Christian Borntraeger
2020-07-22  7:24           ` Janosch Frank
2020-07-22  7:39             ` Christian Borntraeger
2020-07-22  8:05               ` Janosch Frank
2020-08-27  9:20                 ` Thomas Huth

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