Date: Fri, 9 Jun 2000 11:27:34 -0400 (EDT) From: Luoqi Chen <luoqi@watermarkgroup.com> To: current@freebsd.org, emulation@freebsd.org Subject: VMware detection code in boot loader Message-ID: <200006091527.e59FRYb10540@lor.watermarkgroup.com>
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Would anyone object if I add a ficl word to detect whether we're booting
from a vmware virtual machine? I find it extremely useful when I'm running
FreeBSD as a guest under NT. Because it is a dual cpu box, I can't use a
single kernel to boot both directly or inside the virtual machine. With this
new word, I can determine which kernel to use in the loader script, saving
me the trouble to unload and reload a new kernel each time I reboot.
Here's the patch to the boot loader,
Index: boot/ficl/ficl.h
===================================================================
RCS file: /home/ncvs/src/sys/boot/ficl/ficl.h,v
retrieving revision 1.14
diff -u -r1.14 ficl.h
--- boot/ficl/ficl.h 2000/06/01 18:10:43 1.14
+++ boot/ficl/ficl.h 2000/06/07 18:18:38
@@ -860,6 +860,7 @@
#if defined(__i386__) && !defined(TESTMAIN)
extern void ficlOutb(FICL_VM *pVM);
extern void ficlInb(FICL_VM *pVM);
+extern void vmware(FICL_VM *pVM);
#endif
#ifdef __cplusplus
Index: boot/ficl/words.c
===================================================================
RCS file: /home/ncvs/src/sys/boot/ficl/words.c,v
retrieving revision 1.27
diff -u -r1.27 words.c
--- boot/ficl/words.c 2000/06/01 18:10:43 1.27
+++ boot/ficl/words.c 2000/06/07 18:19:13
@@ -4800,6 +4800,7 @@
#ifdef __i386__
dictAppendWord(dp, "outb", ficlOutb, FW_DEFAULT);
dictAppendWord(dp, "inb", ficlInb, FW_DEFAULT);
+ dictAppendWord(dp, "vmware", vmware, FW_DEFAULT);
#endif
#endif
Index: boot/ficl/i386/sysdep.c
===================================================================
RCS file: /home/ncvs/src/sys/boot/ficl/i386/sysdep.c,v
retrieving revision 1.7
diff -u -r1.7 sysdep.c
--- boot/ficl/i386/sysdep.c 1999/09/29 04:43:07 1.7
+++ boot/ficl/i386/sysdep.c 2000/06/07 18:18:13
@@ -111,6 +111,26 @@
c=inb(port);
stackPushINT(pVM->pStack,c);
}
+
+/*
+ * vmware ( -- version )
+ * Get vmware version.
+ */
+void
+vmware(FICL_VM *pVM)
+{
+ int version, magic = 0;
+
+#define VMWARE_MAGIC 0x564d5868
+#define VMWARE_PORT 0x5658
+
+ __asm __volatile("inl %%dx, %%eax"
+ : "=a" (version), "=b" (magic)
+ : "0" (VMWARE_MAGIC), "d" (VMWARE_PORT), "c" (0xa));
+ if (magic != VMWARE_MAGIC)
+ version = -1;
+ stackPushINT(pVM->pStack, version);
+}
#endif
#endif
To use this feature, you first create a file /boot/vmware.4th:
: vmware-conf
vmware dup 0> if
." VMware version " . cr
." Loading /boot/vmware.conf..." cr
s" /boot/vmware.conf" read-conf
else
drop
then
;
then create /boot/vmware.conf which sets the kernel to use:
kernel="/kernel.VMWARE"
finally, change your /boot/loader.rc to
include /boot/loader.4th
include /boot/vmware.4th
initialize drop
vmware-conf
boot-conf
check-password
-lq
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