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[Qemu-devel] [PULL 7/9] pckbd: set bits 2-3-6-7 of the output port by de
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PULL 7/9] pckbd: set bits 2-3-6-7 of the output port by default |
Date: |
Sat, 3 Jan 2015 09:45:07 +0100 |
OSes typically write 0xdd/0xdf to turn the A20 line off and on. This
has bits 2-3-6-7 on, so that the output port subsection is migrated.
Change the reset value and migration default to include those four
bits, thus avoiding that the subsection is migrated.
This strictly speaking changes guest ABI, but the long time during which
we have not migrated the value means that the guests really do not care
much; so the change is for all machine types.
Reported-by: Igor Mammedov <address@hidden>
Cc: address@hidden
Signed-off-by: Paolo Bonzini <address@hidden>
---
hw/input/pckbd.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/hw/input/pckbd.c b/hw/input/pckbd.c
index 2b0cd3d..9b9a7d7 100644
--- a/hw/input/pckbd.c
+++ b/hw/input/pckbd.c
@@ -101,6 +101,12 @@
#define KBD_OUT_OBF 0x10 /* Keyboard output buffer full */
#define KBD_OUT_MOUSE_OBF 0x20 /* Mouse output buffer full */
+/* OSes typically write 0xdd/0xdf to turn the A20 line off and on.
+ * We make the default value of the outport include these four bits,
+ * so that the subsection is rarely necessary.
+ */
+#define KBD_OUT_ONES 0xcc
+
/* Mouse Commands */
#define AUX_SET_SCALE11 0xE6 /* Set 1:1 scaling */
#define AUX_SET_SCALE21 0xE7 /* Set 2:1 scaling */
@@ -367,13 +373,13 @@ static void kbd_reset(void *opaque)
s->mode = KBD_MODE_KBD_INT | KBD_MODE_MOUSE_INT;
s->status = KBD_STAT_CMD | KBD_STAT_UNLOCKED;
- s->outport = KBD_OUT_RESET | KBD_OUT_A20;
+ s->outport = KBD_OUT_RESET | KBD_OUT_A20 | KBD_OUT_ONES;
s->outport_present = false;
}
static uint8_t kbd_outport_default(KBDState *s)
{
- return KBD_OUT_RESET | KBD_OUT_A20
+ return KBD_OUT_RESET | KBD_OUT_A20 | KBD_OUT_ONES
| (s->status & KBD_STAT_OBF ? KBD_OUT_OBF : 0)
| (s->status & KBD_STAT_MOUSE_OBF ? KBD_OUT_MOUSE_OBF : 0);
}
--
1.8.3.1
- [Qemu-devel] [PULL 0/9] Misc changes for 2015-01-03 (icount, migration, iscsi, sdhci-pci), Paolo Bonzini, 2015/01/03
- [Qemu-devel] [PULL 3/9] cpu-exec: add a new CF_USE_ICOUNT cflag, Paolo Bonzini, 2015/01/03
- [Qemu-devel] [PULL 1/9] atomic: fix position of volatile qualifier, Paolo Bonzini, 2015/01/03
- [Qemu-devel] [PULL 2/9] target-ppc: pass DisasContext to SPR generator functions, Paolo Bonzini, 2015/01/03
- [Qemu-devel] [PULL 5/9] gen-icount: check cflags instead of use_icount global, Paolo Bonzini, 2015/01/03
- [Qemu-devel] [PULL 6/9] serial: refine serial_thr_ipending_needed, Paolo Bonzini, 2015/01/03
- [Qemu-devel] [PULL 4/9] translate: check cflags instead of use_icount global, Paolo Bonzini, 2015/01/03
- [Qemu-devel] [PULL 9/9] pci: move REDHAT_SDHCI device ID to make room for Rocker, Paolo Bonzini, 2015/01/03
- [Qemu-devel] [PULL 7/9] pckbd: set bits 2-3-6-7 of the output port by default,
Paolo Bonzini <=
- [Qemu-devel] [PULL 8/9] block/iscsi: fix uninitialized variable, Paolo Bonzini, 2015/01/03
- Re: [Qemu-devel] [PULL 0/9] Misc changes for 2015-01-03 (icount, migration, iscsi, sdhci-pci), Peter Maydell, 2015/01/09