From: Antoine Leca <Antoine.Leca.1@gmail.com>
Date: Fri, 1 Mar 2013 18:59:18 +0000 (+0000)
Subject: VMWare poweroff magic cli;hlt sequence
X-Git-Tag: v3.3.0~845
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/zlib_tech.html?a=commitdiff_plain;h=refs%2Fchanges%2F27%2F727%2F3;p=minix.git

VMWare poweroff magic cli;hlt sequence

Change-Id: I9d8f96cc2e6423b89eb743e27550225d8759ee1d
---

diff --git a/kernel/arch/i386/arch_reset.c b/kernel/arch/i386/arch_reset.c
index 89b43a4a1..0fd32770d 100644
--- a/kernel/arch/i386/arch_reset.c
+++ b/kernel/arch/i386/arch_reset.c
@@ -84,7 +84,14 @@ reset(void)
 	}
 }
 
-void
+static __dead void
+halt(void)
+{
+	for ( ; ; )
+		halt_cpu();
+}
+
+static __dead void
 poweroff(void)
 {
 	const char *shutdown_str;
@@ -96,8 +103,11 @@ poweroff(void)
 	shutdown_str = "Shutdown";
         while (*shutdown_str) outb(0x8900, *(shutdown_str++));
 
+	/* VMware magic power off; likely to halt CPU */
+	poweroff_vmware_clihlt();
+
 	/* fallback option: hang */
-	for (; ; ) halt_cpu();
+	halt();
 }
 
 __dead void arch_shutdown(int how)
diff --git a/kernel/arch/i386/include/arch_proto.h b/kernel/arch/i386/include/arch_proto.h
index 9748b6c52..3aa879096 100644
--- a/kernel/arch/i386/include/arch_proto.h
+++ b/kernel/arch/i386/include/arch_proto.h
@@ -81,9 +81,10 @@ struct exception_frame {
 
 void exception(struct exception_frame * frame);
 
-/* klib386.s */
+/* klib.S */
 __dead void monitor(void);
 __dead void reset(void);
+__dead void poweroff_vmware_clihlt(void);
 __dead void x86_triplefault(void);
 reg_t read_cr0(void);
 reg_t read_cr2(void);
diff --git a/kernel/arch/i386/klib.S b/kernel/arch/i386/klib.S
index abd43faa8..83663a759 100644
--- a/kernel/arch/i386/klib.S
+++ b/kernel/arch/i386/klib.S
@@ -382,6 +382,35 @@ ENTRY(halt_cpu)
 	 */
 	ret
 
+/*===========================================================================*/
+/*			poweroff_vmware_clihlt				     */
+/*===========================================================================*/
+/*
+ * PUBLIC void poweroff_vmware_clihlt(void);
+ * VMware detects this peculiar sequence and forces the virtual machine off
+ * when the parameter gui.exitOnCLIHLT is set to TRUE.
+ * Otherwise this sequence just hangs the CPU, requiring a power down action.
+ */
+ENTRY(poweroff_vmware_clihlt)
+#ifndef NO_VMWARE_DETECTION
+	mov	$1, %eax
+	cpuid
+	test	$[1<<31], %ecx /* "virtualized" */
+	jz	1f	/* always 0 on real hardware */
+	mov	$0x40000000, %eax /* select hypervisor-use leaf */
+	cpuid
+	cmp	$0x61774D56, %ebx /* ASCII "VMwa" */
+	jne	1f
+	cmp	$0x4D566572, %ecx /* ASCII "reVM" */
+	jne	1f
+	cmp	$0x65726177, %edx /* ASCII "ware" */
+	jne	1f
+	/* we are virtualized by some VMware product! */
+#endif
+	cli
+	hlt
+1:	ret
+
 /*===========================================================================*/
 /*			      read_flags				     */
 /*===========================================================================*/