Attachment 398908 Details for Bug 625041

[patch] xf86-input-vmmouse-iopl-driver.diff

xf86-input-vmmouse-iopl-driver.diff (text/plain), 1.65 KB, created by Stefan Dirsch on 2010-11-07 21:21:25 UTC

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Creator: Stefan Dirsch

Created: 2010-11-07 21:21:25 UTC

Size: 1.65 KB

patch

obsolete

>diff --git a/shared/vmmouse_proto.c b/shared/vmmouse_proto.c
>index b50e071..08d471d 100644
>--- a/shared/vmmouse_proto.c
>+++ b/shared/vmmouse_proto.c
>@@ -33,6 +33,8 @@
>  */
> 
> 
>+#include <stdio.h>
>+#include <sys/io.h>
> #include "vmmouse_proto.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();
>+   fprintf(stderr, "Current I/O privilege level: %d", cpl);
>+   /*
>+    * To access i/o ports above 0x3ff, we need to be in iopl(3).
>+    */
>+   fprintf(stderr, "Switching to I/O privilege level 3.");
>+   iopl(3);
>+#endif
>+
>    VMMouseProtoInOut(cmd);
>+
>+#if defined __i386__ || defined __x86_64__ 
>+   fprintf(stderr, "Switching back to previous I/O privilege level %d.\n", cpl);
>+   iopl(cpl);
>+#endif
> }

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