xen pvfb: Dynamic mode support (screen resizing)

[safe/jmp/linux-2.6] / include / xen / interface / io / fbif.h

diff --git a/include/xen/interface/io/fbif.h b/include/xen/interface/io/fbif.h
index 5a934dd..974a51e 100644 (file)
--- a/include/xen/interface/io/fbif.h
+++ b/include/xen/interface/io/fbif.h
@@ -49,11 +49,27 @@ struct xenfb_update {
        int32_t height;         /* rect height */
 };
 
+/*
+ * Framebuffer resize notification event
+ * Capable backend sets feature-resize in xenstore.
+ */
+#define XENFB_TYPE_RESIZE 3
+
+struct xenfb_resize {
+       uint8_t type;           /* XENFB_TYPE_RESIZE */
+       int32_t width;          /* width in pixels */
+       int32_t height;         /* height in pixels */
+       int32_t stride;         /* stride in bytes */
+       int32_t depth;          /* depth in bits */
+       int32_t offset;         /* start offset within framebuffer */
+};
+
 #define XENFB_OUT_EVENT_SIZE 40
 
 union xenfb_out_event {
        uint8_t type;
        struct xenfb_update update;
+       struct xenfb_resize resize;
        char pad[XENFB_OUT_EVENT_SIZE];
 };
 
@@ -105,15 +121,18 @@ struct xenfb_page {
         * Each directory page holds PAGE_SIZE / sizeof(*pd)
         * framebuffer pages, and can thus map up to PAGE_SIZE *
         * PAGE_SIZE / sizeof(*pd) bytes.  With PAGE_SIZE == 4096 and
-        * sizeof(unsigned long) == 4, that's 4 Megs.  Two directory
-        * pages should be enough for a while.
+        * sizeof(unsigned long) == 4/8, that's 4 Megs 32 bit and 2
+        * Megs 64 bit.  256 directories give enough room for a 512
+        * Meg framebuffer with a max resolution of 12,800x10,240.
+        * Should be enough for a while with room leftover for
+        * expansion.
         */
-       unsigned long pd[2];
+       unsigned long pd[256];
 };
 
 /*
- * Wart: xenkbd needs to know resolution.  Put it here until a better
- * solution is found, but don't leak it to the backend.
+ * Wart: xenkbd needs to know default resolution.  Put it here until a
+ * better solution is found, but don't leak it to the backend.
  */
 #ifdef __KERNEL__
 #define XENFB_WIDTH 800