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[Qemu-devel] [PATCH 05/13] s390x: implement rrbe instruction properly
From: |
Alexander Graf |
Subject: |
[Qemu-devel] [PATCH 05/13] s390x: implement rrbe instruction properly |
Date: |
Sun, 13 Nov 2011 16:33:46 +0100 |
The rrbe instruction resets the reference bit in the given storage key.
So far, we merely made it a nop and also returned an invalid CC value,
so that the kernel never knew if a page actually got accessed.
This patch implements it properly, flushing the R bit and returning the
correct CC value.
Signed-off-by: Alexander Graf <address@hidden>
---
target-s390x/op_helper.c | 12 +++++++-----
1 files changed, 7 insertions(+), 5 deletions(-)
diff --git a/target-s390x/op_helper.c b/target-s390x/op_helper.c
index 440e871..364b100 100644
--- a/target-s390x/op_helper.c
+++ b/target-s390x/op_helper.c
@@ -2779,14 +2779,15 @@ void HELPER(sske)(uint32_t r1, uint64_t r2)
/* reset reference bit extended */
uint32_t HELPER(rrbe)(uint32_t r1, uint64_t r2)
{
+ uint8_t re;
+ uint8_t key;
if (r2 > ram_size) {
return 0;
}
- /* XXX implement */
-#if 0
- env->storage_keys[r2 / TARGET_PAGE_SIZE] &= ~SK_REFERENCED;
-#endif
+ key = env->storage_keys[r2 / TARGET_PAGE_SIZE];
+ re = key & (SK_R | SK_C);
+ env->storage_keys[r2 / TARGET_PAGE_SIZE] = (key & ~SK_R);
/*
* cc
@@ -2796,7 +2797,8 @@ uint32_t HELPER(rrbe)(uint32_t r1, uint64_t r2)
* 2 Reference bit one; change bit zero
* 3 Reference bit one; change bit one
*/
- return 0;
+
+ return re >> 1;
}
/* compare and swap and purge */
--
1.6.0.2
- [Qemu-devel] [PATCH 12/13] tcg: Use TCGReg for standard tcg-target entry points., (continued)
- [Qemu-devel] [PATCH 12/13] tcg: Use TCGReg for standard tcg-target entry points., Alexander Graf, 2011/11/13
- [Qemu-devel] [PATCH 09/13] s390: Fix cpu shutdown for KVM, Alexander Graf, 2011/11/13
- [Qemu-devel] [PATCH 02/13] s390x: add ldeb instruction, Alexander Graf, 2011/11/13
- [Qemu-devel] [PATCH 03/13] s390x: make ipte 31-bit aware, Alexander Graf, 2011/11/13
- [Qemu-devel] [PATCH 01/13] [S390] Add hotplug support, Alexander Graf, 2011/11/13
- [Qemu-devel] [PATCH 11/13] tcg: Standardize on TCGReg as the enum for hard registers, Alexander Graf, 2011/11/13
- [Qemu-devel] [PATCH 07/13] s390: fix reset hypercall to reset the status, Alexander Graf, 2011/11/13
- [Qemu-devel] [PATCH 08/13] s390: fix short kernel command lines, Alexander Graf, 2011/11/13
- [Qemu-devel] [PATCH 05/13] s390x: implement rrbe instruction properly,
Alexander Graf <=
- [Qemu-devel] [PATCH 10/13] s390x: Add shutdown for TCG s390-virtio machine, Alexander Graf, 2011/11/13