X-Git-Url: http://git.joshuawise.com/netwatch.git/blobdiff_plain/96837c792131679ab97dee48b9e879ea2d2f74c3..77671f96efe9904af681de78c96e305e4e0f3abe:/aseg-paging/smi.c

diff --git a/aseg-paging/smi.c b/aseg-paging/smi.c
index 031797d..d519341 100644
--- a/aseg-paging/smi.c
+++ b/aseg-paging/smi.c
@@ -7,6 +7,7 @@
 #include <serial.h>
 #include <fb.h>
 #include <output.h>
+#include <msr.h>
 #include "../net/net.h"
 #include "vga-overlay.h"
 
@@ -18,6 +19,9 @@ void smi_entry(void)
 {
 	char statstr[512];
 
+	/* Reenable caching on SMRAM. */
+	WRMSR(0x202, (RDMSR(0x202) & ~(0xFFULL)) | 0x06ULL);
+
 	pcisave = inl(0xCF8);
 	vgasave = inb(0x3D4);
 	pci_unbother_all();
@@ -28,8 +32,11 @@ void smi_entry(void)
         	fb->getvmode(fb->priv);
 
 	counter++;
-	sprintf(statstr, "NetWatch! %08x %08x", smi_status(), counter);
-	strblit(statstr, 0, 0, 0);
+	if (!fb || fb->curmode.text)
+	{
+        	sprintf(statstr, "NetWatch! %08x %08x", smi_status(), counter);
+		strblit(statstr, 0, 0, 0);
+	}
 	
 	eth_poll();
 	
@@ -48,6 +55,9 @@ void smi_entry(void)
 	pci_bother_all();
 	outl(0xCF8, pcisave);
 	outb(0x3D4, vgasave);
+	
+	/* Disable caching on SMRAM again, to prevent the user from whacking us. */
+	WRMSR(0x202, RDMSR(0x202) & ~(0xFFULL));
 }
 
 extern void timer_handler(smi_event_t ev);