Attachment 398903 Details for Bug 625041

[patch] 0001-To-access-i-o-ports-above-0x3ff-we-need-to-be-in-iop.patch

0001-To-access-i-o-ports-above-0x3ff-we-need-to-be-in-iop.patch (text/plain), 2.13 KB, created by Stefan Dirsch on 2010-11-07 12:02:03 UTC

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Creator: Stefan Dirsch

Created: 2010-11-07 12:02:03 UTC

Size: 2.13 KB

patch

obsolete

>From b40c6c46f0b56ab511c8ca3753e75c66cecd5006 Mon Sep 17 00:00:00 2001
>From: Stefan Dirsch <sndirsch@suse.de>
>Date: Sun, 7 Nov 2010 12:54:17 +0100
>Subject: [PATCH] To access i/o ports above 0x3ff, we need to be in iopl(3).
>
>Switch to I/O privilege level 3 before accessing ports above 0x3ff.
>Afterwards switch back to previous I/O privilege level.
>---
> shared/vmmouse_proto.c |   44 ++++++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 44 insertions(+), 0 deletions(-)
>
>diff --git a/shared/vmmouse_proto.c b/shared/vmmouse_proto.c
>index b50e071..2708af3 100644
>--- a/shared/vmmouse_proto.c
>+++ b/shared/vmmouse_proto.c
>@@ -33,7 +33,9 @@
>  */
> 
> 
>+#include <sys/io.h>
> #include "vmmouse_proto.h"
>+#include "vmmouse_client.h"
> 
> 
> /*
>@@ -119,6 +121,31 @@ VMMouseProtoInOut(VMMouseProtoCmd *cmd) // IN/OUT
> #endif
> }
> 
>+/*
>+ *-----------------------------------------------------------------------------
>+ *
>+ * VMMouseGetIOPL --
>+ *
>+ *      Helper to figure out the current I/O privilege level (idea by
>+ *      Jiri Kosina <jkosina@suse.cz>)
>+ *
>+ * Results:
>+ *      Returns I/O privilege level
>+ *
>+ * Side effects:
>+ *      None
>+ *
>+ *-----------------------------------------------------------------------------
>+ */
>+
>+int 
>+VMMouseGetIOPL()
>+{
>+        unsigned long eflags;
>+
>+        asm ("pushf\n\tpop %0" : "=r" (eflags));
>+        return (eflags >> 12) & 3;
>+}
> 
> /*
>  *-----------------------------------------------------------------------------
>@@ -140,8 +167,25 @@ VMMouseProtoInOut(VMMouseProtoCmd *cmd) // IN/OUT
> void
> VMMouseProto_SendCmd(VMMouseProtoCmd *cmd) // IN/OUT
> {
>+   int cpl;
>+
>    cmd->in.magic = VMMOUSE_PROTO_MAGIC;
>    cmd->in.port = VMMOUSE_PROTO_PORT;
> 
>+#if defined __i386__ || defined __x86_64__ 
>+   cpl = VMMouseGetIOPL();
>+   VMwareLog(("Current I/O privilege level: %d", cpl));
>+   /*
>+    * To access i/o ports above 0x3ff, we need to be in iopl(3).
>+    */
>+   VMwareLog(("Switching to I/O privilege level 3."));
>+   iopl(3);
>+#endif
>+
>    VMMouseProtoInOut(cmd);
>+
>+#if defined __i386__ || defined __x86_64__ 
>+   VMwareLog(("Switching back to previous I/O privilege level %d.\n", cpl));
>+   iopl(cpl);
>+#endif
> }
>-- 
>1.7.3.1
>

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