xen: allow enable use of VGA console on dom0

commit c2419b4a4727f67af2fc2cd68b0d878b75e781bb upstream.

Get the information about the VGA console hardware from Xen, and put
it into the form the bootloader normally generates, so that the rest
of the kernel can deal with VGA as usual.

[ Impact: make VGA console work in dom0 ]

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
[v1: Rebased on 2.6.39]
[v2: Removed incorrect comments and fixed compile warnings]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 39 insertions, 0 deletions

diff --git a/include/xen/interface/xen.h b/include/xen/interface/xen.h
index 70213b4515e..6acd9cefd51 100644
--- a/include/xen/interface/xen.h
+++ b/include/xen/interface/xen.h
@@ -450,6 +450,45 @@ struct start_info {
         int8_t cmd_line[MAX_GUEST_CMDLINE];
 };
 
+struct dom0_vga_console_info {
+        uint8_t video_type;
+#define XEN_VGATYPE_TEXT_MODE_3 0x03
+#define XEN_VGATYPE_VESA_LFB    0x23
+
+        union {
+                struct {
+                        /* Font height, in pixels. */
+                        uint16_t font_height;
+                        /* Cursor location (column, row). */
+                        uint16_t cursor_x, cursor_y;
+                        /* Number of rows and columns (dimensions in characters). */
+                        uint16_t rows, columns;
+                } text_mode_3;
+
+                struct {
+                        /* Width and height, in pixels. */
+                        uint16_t width, height;
+                        /* Bytes per scan line. */
+                        uint16_t bytes_per_line;
+                        /* Bits per pixel. */
+                        uint16_t bits_per_pixel;
+                        /* LFB physical address, and size (in units of 64kB). */
+                        uint32_t lfb_base;
+                        uint32_t lfb_size;
+                        /* RGB mask offsets and sizes, as defined by VBE 1.2+ */
+                        uint8_t  red_pos, red_size;
+                        uint8_t  green_pos, green_size;
+                        uint8_t  blue_pos, blue_size;
+                        uint8_t  rsvd_pos, rsvd_size;
+
+                        /* VESA capabilities (offset 0xa, VESA command 0x4f00). */
+                        uint32_t gbl_caps;
+                        /* Mode attributes (offset 0x0, VESA command 0x4f01). */
+                        uint16_t mode_attrs;
+                } vesa_lfb;
+        } u;
+};
+
 /* These flags are passed in the 'flags' field of start_info_t. */
 #define SIF_PRIVILEGED    (1<<0)  /* Is the domain privileged? */
 #define SIF_INITDOMAIN    (1<<1)  /* Is this the initial control domain? */