From: Erik van der Kouwe <erikvdk@gmail.com>
Date: Tue, 13 Apr 2010 21:49:02 +0000 (-0500)
Subject: This patch fixes several issues with the console/cga code:
X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?p=palacios.git;a=commitdiff_plain;h=c09d92dc256363c742ca2a4bef685ed79575bf22;hp=3b67b03716ad6bfdda5c95c8a0ef9004da1b3913

This patch fixes several issues with the console/cga code:
- Fixes some #includes
- Adds a missing prototype
- Adds a missing return
- Checks the length of screen updates to avoid sending updates for non-
visible memory regions
---

diff --git a/palacios/include/devices/console.h b/palacios/include/devices/console.h
index 8484452..1040b95 100644
--- a/palacios/include/devices/console.h
+++ b/palacios/include/devices/console.h
@@ -34,6 +34,7 @@ struct v3_console_ops {
 
 
 int v3_cons_get_fb(struct vm_device * frontend_dev, uint8_t * dst, uint_t offset, uint_t length);
+int v3_console_register_cga(struct vm_device * cga_dev, struct v3_console_ops * ops, void * private_data);
 
 #endif // ! __V3VEE__
 
diff --git a/palacios/src/devices/cga.c b/palacios/src/devices/cga.c
index ee94f84..6c82c58 100644
--- a/palacios/src/devices/cga.c
+++ b/palacios/src/devices/cga.c
@@ -24,7 +24,7 @@
 #include <palacios/vmm_emulator.h>
 #include <palacios/vm_guest_mem.h>
 
-#include <devices/cga.h>
+#include <devices/console.h>
 
 
 
@@ -120,6 +120,7 @@ static int video_write_mem(addr_t guest_addr, void * dest, uint_t length, void *
     struct video_internal * state = (struct video_internal *)dev->private_data;
     uint_t fb_offset = guest_addr - START_ADDR;
     uint_t screen_byte_offset = state->screen_offset * BYTES_PER_COL;
+    uint_t screen_length;
 
     PrintDebug("Guest address: %p length = %d, fb_offset=%d, screen_offset=%d\n", 
 	       (void *)guest_addr, length, fb_offset, screen_byte_offset);
@@ -136,7 +137,11 @@ static int video_write_mem(addr_t guest_addr, void * dest, uint_t length, void *
 	
 	if (state->ops) {
 	    PrintDebug("\tcalling update_screen()\n");
-	    state->ops->update_screen(x, y, length, state->private_data);
+	    
+	    /* avoid updates past end of screen */
+	    screen_length = SCREEN_SIZE - screen_byte_offset;
+	    if (screen_length > length) screen_length = length;
+	    state->ops->update_screen(x, y, screen_length, state->private_data);
 	}
     }
 
diff --git a/palacios/src/devices/telnet_cons.c b/palacios/src/devices/telnet_cons.c
index 8f71adf..d0c2b1f 100644
--- a/palacios/src/devices/telnet_cons.c
+++ b/palacios/src/devices/telnet_cons.c
@@ -29,8 +29,10 @@
 #include <palacios/vmm_string.h>
 #include <palacios/vmm_socket.h>
 
-#include <devices/cga.h>
+#include <devices/console.h>
+#if 0
 #include <devices/telnet_cons.h>
+#endif
 
 #define NUM_ROWS 25
 #define NUM_COLS 80
@@ -516,6 +518,8 @@ static int cons_server(void * arg) {
 	state->connected = 0;
 	V3_Close_Socket(state->client_fd);
     }
+    
+    return -1;
 }