Rehash following last round of comments
What changed:
1. Reverted back to pd[] for mappings, removed all gntref code.
2. Added videoram vfb parameter so that admin can limit what a frontend
can allocate
3. xenfb kernel parameters are used to set the built-in width and
height to support
configure less X11.
extra="xenfb.video=5,1024,768 "
Unless I missed something I think this addresses all of the raised concerns.
Thanks to all that have looked at this never ending RFC and commented.
Pat
diff -r e32fe4703ab6 drivers/xen/fbfront/xenfb.c
--- a/drivers/xen/fbfront/xenfb.c Tue Jan 29 11:53:33 2008 +0000
+++ b/drivers/xen/fbfront/xenfb.c Mon Feb 04 11:34:36 2008 -0700
@@ -28,6 +28,7 @@
#include <asm/hypervisor.h>
#include <xen/evtchn.h>
#include <xen/interface/io/fbif.h>
+#include <xen/interface/io/kbdif.h>
#include <xen/interface/io/protocols.h>
#include <xen/xenbus.h>
#include <linux/kthread.h>
@@ -62,6 +63,13 @@ struct xenfb_info
struct xenfb_page *page;
unsigned long *mfns;
int update_wanted; /* XENFB_TYPE_UPDATE wanted */
+ int feature_resize; /* Backend has resize feature */
+ int resize_dpy;
+ int xres, yres; /* current resolution */
+ int fb_size; /* fb size in bytes */
+ int fb_width; /* fb mem width in pixels */
+ int fb_height; /* fb mem height in pixels */
+ int fb_stride; /* fb stride in bytes */
struct xenbus_device *xbdev;
};
@@ -129,20 +137,48 @@ struct xenfb_info
*
* Oh well, we wont be updating the writes to this page anytime soon.
*/
+enum {KPARAM_MEM, KPARAM_WIDTH, KPARAM_HEIGHT, KPARAM_CNT};
+static int video[KPARAM_CNT] = {0};
+static int video_cnt = 0;
+module_param_array(video, int, &video_cnt, 0);
+MODULE_PARM_DESC(video,
+ "Size of video memory in MB and width,height in pixels, default
= (2,800,600)");
+
+#define XENFB_WIDTH 800
+#define XENFB_HEIGHT 600
+#define XENFB_DEPTH 32
+#define MB_ (1024*1024)
+#define XENFB_PIXCLOCK 9025 /* Xorg "1280x1024" 110.80 to FB 1000000/110.80
*/
+#define XENFB_DEFAULT_FB_LEN (XENFB_WIDTH * XENFB_HEIGHT * XENFB_DEPTH / 8)
static int xenfb_fps = 20;
-static unsigned long xenfb_mem_len = XENFB_WIDTH * XENFB_HEIGHT * XENFB_DEPTH
/ 8;
+static unsigned long xenfb_mem_len = 0;
static int xenfb_remove(struct xenbus_device *);
static void xenfb_init_shared_page(struct xenfb_info *);
static int xenfb_connect_backend(struct xenbus_device *, struct xenfb_info *);
static void xenfb_disconnect_backend(struct xenfb_info *);
+static void xenfb_refresh(struct xenfb_info *info, int x1, int y1, int w, int
h);
+
+static void xenfb_send_event(struct xenfb_info *info,
+ union xenfb_out_event *event)
+{
+ __u32 prod;
+
+ prod = info->page->out_prod;
+ /* caller ensures !xenfb_queue_full() */
+ mb(); /* ensure ring space available */
+ XENFB_OUT_RING_REF(info->page, prod) = *event;
+ wmb(); /* ensure ring contents visible */
+ info->page->out_prod = prod + 1;
+
+ notify_remote_via_irq(info->irq);
+}
static void xenfb_do_update(struct xenfb_info *info,
int x, int y, int w, int h)
{
union xenfb_out_event event;
- __u32 prod;
event.type = XENFB_TYPE_UPDATE;
event.update.x = x;
@@ -150,14 +186,19 @@ static void xenfb_do_update(struct xenfb
event.update.width = w;
event.update.height = h;
- prod = info->page->out_prod;
- /* caller ensures !xenfb_queue_full() */
- mb(); /* ensure ring space available */
- XENFB_OUT_RING_REF(info->page, prod) = event;
- wmb(); /* ensure ring contents visible */
- info->page->out_prod = prod + 1;
-
- notify_remote_via_irq(info->irq);
+ xenfb_send_event(info, &event);
+}
+
+static void xenfb_do_resize(struct xenfb_info *info)
+{
+ union xenfb_out_event event;
+
+ event.type = XENFB_TYPE_RESIZE;
+ event.resize.width = info->xres;
+ event.resize.height = info->yres;
+ event.resize.stride = info->fb_stride;
+
+ xenfb_send_event(info, &event);
}
static int xenfb_queue_full(struct xenfb_info *info)
@@ -209,6 +250,16 @@ static void xenfb_update_screen(struct x
xenfb_do_update(info, x1, y1, x2 - x1, y2 - y1);
}
+static void xenfb_resize_screen(struct xenfb_info *info)
+{
+ if (xenfb_queue_full(info))
+ return;
+
+ info->resize_dpy = 0;
+ xenfb_do_resize(info);
+ xenfb_refresh(info, 0, 0, info->xres, info->yres);
+}
+
static int xenfb_thread(void *data)
{
struct xenfb_info *info = data;
@@ -217,6 +268,9 @@ static int xenfb_thread(void *data)
if (info->dirty) {
info->dirty = 0;
xenfb_update_screen(info);
+ }
+ if (info->resize_dpy) {
+ xenfb_resize_screen(info);
}
wait_event_interruptible(info->wq,
kthread_should_stop() || info->dirty);
@@ -413,6 +467,47 @@ static int xenfb_mmap(struct fb_info *fb
return 0;
}
+static int
+xenfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
+{
+ struct xenfb_info *xenfb_info;
+
+ xenfb_info = info->par;
+
+ if (!xenfb_info->feature_resize) {
+ if (var->xres == XENFB_WIDTH && var->yres == XENFB_HEIGHT
+ && var->bits_per_pixel ==
xenfb_info->page->depth) {
+ return 0;
+ }
+ return -EINVAL;
+ }
+ if (var->bits_per_pixel == xenfb_info->page->depth &&
+ xenfb_info->fb_width >= var->xres &&
+ xenfb_mem_len >= (var->xres * var->yres *
(xenfb_info->page->depth / 8))) {
+ var->xres_virtual = var->xres;
+ var->yres_virtual = var->yres;
+ return 0;
+ }
+ return -EINVAL;
+}
+
+static int xenfb_set_par(struct fb_info *info)
+{
+ struct xenfb_info *xenfb_info;
+
+ xenfb_info = info->par;
+
+ if (xenfb_info->xres != info->var.xres ||
+ xenfb_info->yres != info->var.yres) {
+ xenfb_info->resize_dpy = 1;
+ xenfb_info->xres = info->var.xres_virtual = info->var.xres;
+ xenfb_info->yres = info->var.yres_virtual = info->var.yres;
+ info->fix.line_length = xenfb_info->fb_stride;
+ xenkbd_set_ptr_geometry(xenfb_info->xres, xenfb_info->yres);
+ }
+ return 0;
+}
+
static struct fb_ops xenfb_fb_ops = {
.owner = THIS_MODULE,
.fb_setcolreg = xenfb_setcolreg,
@@ -420,6 +515,8 @@ static struct fb_ops xenfb_fb_ops = {
.fb_copyarea = xenfb_copyarea,
.fb_imageblit = xenfb_imageblit,
.fb_mmap = xenfb_mmap,
+ .fb_check_var = xenfb_check_var,
+ .fb_set_par = xenfb_set_par,
};
static irqreturn_t xenfb_event_handler(int rq, void *dev_id,
@@ -450,6 +547,8 @@ static int __devinit xenfb_probe(struct
{
struct xenfb_info *info;
struct fb_info *fb_info;
+ int fb_size;
+ int val;
int ret;
info = kzalloc(sizeof(*info), GFP_KERNEL);
@@ -457,6 +556,32 @@ static int __devinit xenfb_probe(struct
xenbus_dev_fatal(dev, -ENOMEM, "allocating info structure");
return -ENOMEM;
}
+
+ info->fb_width = info->xres = XENFB_WIDTH;
+ info->fb_height = info->yres = XENFB_HEIGHT;
+ fb_size = XENFB_DEFAULT_FB_LEN;
+
+ if (xenbus_scanf(XBT_NIL, dev->otherend, "videoram", "%d", &val) == 1) {
+ if (val * MB_ >= XENFB_DEFAULT_FB_LEN) {
+ video[KPARAM_MEM] = val;
+ fb_size = val * MB_;
+ }
+ }
+
+ if (video_cnt == KPARAM_CNT && (video[KPARAM_MEM] * MB_) >=
XENFB_DEFAULT_FB_LEN) {
+ fb_size = video[KPARAM_MEM] * MB_;
+ if (video[KPARAM_WIDTH] * video[KPARAM_HEIGHT] * XENFB_DEPTH/8
< fb_size) {
+ info->fb_width = info->xres = video[KPARAM_WIDTH];
+ info->fb_height = info->yres = video[KPARAM_HEIGHT];
+ }
+ }
+
+ info->fb_size = fb_size;
+ info->fb_stride = info->fb_width * (XENFB_DEPTH / 8);
+ xenfb_mem_len = info->fb_size;
+
+ xenkbd_set_ptr_geometry(info->fb_width, info->fb_height);
+
dev->dev.driver_data = info;
info->xbdev = dev;
info->irq = -1;
@@ -504,9 +629,10 @@ static int __devinit xenfb_probe(struct
fb_info->screen_base = info->fb;
fb_info->fbops = &xenfb_fb_ops;
- fb_info->var.xres_virtual = fb_info->var.xres = info->page->width;
- fb_info->var.yres_virtual = fb_info->var.yres = info->page->height;
+ fb_info->var.xres_virtual = fb_info->var.xres = info->xres;
+ fb_info->var.yres_virtual = fb_info->var.yres = info->yres;
fb_info->var.bits_per_pixel = info->page->depth;
+ fb_info->var.pixclock = XENFB_PIXCLOCK;
fb_info->var.red = (struct fb_bitfield){16, 8, 0};
fb_info->var.green = (struct fb_bitfield){8, 8, 0};
@@ -572,6 +698,8 @@ static int xenfb_resume(struct xenbus_de
xenfb_disconnect_backend(info);
xenfb_init_shared_page(info);
+ if (info->xres != XENFB_WIDTH || info->yres != XENFB_HEIGHT)
+ info->resize_dpy = 1;
return xenfb_connect_backend(dev, info);
}
@@ -600,6 +728,7 @@ static void xenfb_init_shared_page(struc
static void xenfb_init_shared_page(struct xenfb_info *info)
{
int i;
+ int epd = PAGE_SIZE/sizeof(info->mfns[0]);
for (i = 0; i < info->nr_pages; i++)
info->pages[i] = vmalloc_to_page(info->fb + i * PAGE_SIZE);
@@ -607,12 +736,13 @@ static void xenfb_init_shared_page(struc
for (i = 0; i < info->nr_pages; i++)
info->mfns[i] = vmalloc_to_mfn(info->fb + i * PAGE_SIZE);
- info->page->pd[0] = vmalloc_to_mfn(info->mfns);
- info->page->pd[1] = 0;
- info->page->width = XENFB_WIDTH;
- info->page->height = XENFB_HEIGHT;
+ for (i = 0; i * epd < info->nr_pages; i++)
+ info->page->pd[i] = vmalloc_to_mfn(&info->mfns[i *
epd]);
+
+ info->page->width = info->xres;
+ info->page->height = info->yres;
info->page->depth = XENFB_DEPTH;
- info->page->line_length = (info->page->depth / 8) * info->page->width;
+ info->page->line_length = info->fb_stride;
info->page->mem_length = xenfb_mem_len;
info->page->in_cons = info->page->in_prod = 0;
info->page->out_cons = info->page->out_prod = 0;
@@ -710,6 +840,11 @@ static void xenfb_backend_changed(struct
val = 0;
if (val)
info->update_wanted = 1;
+
+ if (xenbus_scanf(XBT_NIL, dev->otherend,
+ "feature-resize", "%d", &val) < 0)
+ val = 0;
+ info->feature_resize = val;
break;
case XenbusStateClosing:
diff -r e32fe4703ab6 drivers/xen/fbfront/xenkbd.c
--- a/drivers/xen/fbfront/xenkbd.c Tue Jan 29 11:53:33 2008 +0000
+++ b/drivers/xen/fbfront/xenkbd.c Mon Feb 04 08:41:35 2008 -0700
@@ -40,6 +40,10 @@ static int xenkbd_remove(struct xenbus_d
static int xenkbd_remove(struct xenbus_device *);
static int xenkbd_connect_backend(struct xenbus_device *, struct xenkbd_info
*);
static void xenkbd_disconnect_backend(struct xenkbd_info *);
+
+static int max_abs_xres;
+static int max_abs_yres;
+static struct input_dev *mouse_ptr;
/*
* Note: if you need to send out events, see xenfb_do_update() for how
@@ -163,8 +167,8 @@ int __devinit xenkbd_probe(struct xenbus
for (i = BTN_LEFT; i <= BTN_TASK; i++)
set_bit(i, ptr->keybit);
ptr->relbit[0] = BIT(REL_X) | BIT(REL_Y) | BIT(REL_WHEEL);
- input_set_abs_params(ptr, ABS_X, 0, XENFB_WIDTH, 0, 0);
- input_set_abs_params(ptr, ABS_Y, 0, XENFB_HEIGHT, 0, 0);
+ input_set_abs_params(ptr, ABS_X, 0, max_abs_xres, 0, 0);
+ input_set_abs_params(ptr, ABS_Y, 0, max_abs_yres, 0, 0);
ret = input_register_device(ptr);
if (ret) {
@@ -172,7 +176,7 @@ int __devinit xenkbd_probe(struct xenbus
xenbus_dev_fatal(dev, ret, "input_register_device(ptr)");
goto error;
}
- info->ptr = ptr;
+ mouse_ptr = info->ptr = ptr;
ret = xenkbd_connect_backend(dev, info);
if (ret < 0)
@@ -338,6 +342,18 @@ static void __exit xenkbd_cleanup(void)
return xenbus_unregister_driver(&xenkbd);
}
+void xenkbd_set_ptr_geometry(int xres, int yres)
+{
+ max_abs_xres = xres;
+ max_abs_yres = yres;
+ if (mouse_ptr) {
+ input_set_abs_params(mouse_ptr, ABS_X, 0, max_abs_xres, 0, 0);
+ input_set_abs_params(mouse_ptr, ABS_Y, 0, max_abs_yres, 0, 0);
+ input_event(mouse_ptr, EV_SYN, SYN_CONFIG, 0);
+ }
+}
+EXPORT_SYMBOL(xenkbd_set_ptr_geometry);
+
module_init(xenkbd_init);
module_exit(xenkbd_cleanup);
diff -r e32fe4703ab6 include/xen/interface/io/fbif.h
--- a/include/xen/interface/io/fbif.h Tue Jan 29 11:53:33 2008 +0000
+++ b/include/xen/interface/io/fbif.h Mon Feb 04 08:53:20 2008 -0700
@@ -50,12 +50,28 @@ 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; /* future */
+};
+
#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];
};
@@ -109,21 +125,13 @@ 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.
- */
-#ifdef __KERNEL__
-#define XENFB_WIDTH 800
-#define XENFB_HEIGHT 600
-#define XENFB_DEPTH 32
-#endif
#endif
diff -r e32fe4703ab6 include/xen/interface/io/kbdif.h
--- a/include/xen/interface/io/kbdif.h Tue Jan 29 11:53:33 2008 +0000
+++ b/include/xen/interface/io/kbdif.h Fri Feb 01 11:54:37 2008 -0700
@@ -119,6 +119,10 @@ struct xenkbd_page
uint32_t out_cons, out_prod;
};
+#ifdef __KERNEL__
+void xenkbd_set_ptr_geometry(int xres, int yres);
+#endif
+
#endif
/*
diff -r 1b013d10c6d1 tools/ioemu/hw/xenfb.c
--- a/tools/ioemu/hw/xenfb.c Mon Jan 28 10:37:08 2008 +0000
+++ b/tools/ioemu/hw/xenfb.c Mon Feb 04 07:30:36 2008 -0700
@@ -264,6 +264,9 @@ struct xenfb *xenfb_new(int domid, Displ
xenfb->ds = ds;
xenfb_device_set_domain(&xenfb->fb, domid);
xenfb_device_set_domain(&xenfb->kbd, domid);
+
+ /* Indicate we have the frame buffer resize feature */
+ xenfb_xs_printf(xenfb->xsh, xenfb->fb.nodename, "feature-resize", "1");
fprintf(stderr, "FB: Waiting for KBD backend creation\n");
xenfb_wait_for_backend(&xenfb->kbd, xenfb_backend_created_kbd);
@@ -510,6 +513,12 @@ static void xenfb_on_fb_event(struct xen
}
xenfb_guest_copy(xenfb, x, y, w, h);
break;
+ case XENFB_TYPE_RESIZE:
+ xenfb->width = event->resize.width;
+ xenfb->height = event->resize.height;
+ xenfb->row_stride = event->resize.stride;
+ dpy_resize(xenfb->ds, xenfb->width, xenfb->height);
+ break;
}
}
mb(); /* ensure we're done with ring contents */
@@ -672,6 +681,7 @@ static int xenfb_read_frontend_fb_config
static int xenfb_read_frontend_fb_config(struct xenfb *xenfb) {
struct xenfb_page *fb_page;
int val;
+ int videoram = 0;
if (xenfb_xs_scanf1(xenfb->xsh, xenfb->fb.otherend, "feature-update",
"%d", &val) < 0)
@@ -686,14 +696,22 @@ static int xenfb_read_frontend_fb_config
xenfb->protocol[0] = '\0';
xenfb_xs_printf(xenfb->xsh, xenfb->fb.nodename, "request-update", "1");
- /* TODO check for permitted ranges */
+ if (xenfb_xs_scanf1(xenfb->xsh, xenfb->fb.nodename, "videoram", "%d",
&videoram) < 0)
+ videoram = 0;
+ videoram = videoram * 1024 * 1024;
+
fb_page = xenfb->fb.page;
xenfb->depth = fb_page->depth;
xenfb->width = fb_page->width;
xenfb->height = fb_page->height;
- /* TODO check for consistency with the above */
xenfb->fb_len = fb_page->mem_length;
xenfb->row_stride = fb_page->line_length;
+ /* Protect against hostile frontend, limit fb_len to configured */
+ if (videoram && xenfb->fb_len > videoram) {
+ xenfb->fb_len = videoram;
+ if (xenfb->row_stride * xenfb->height > xenfb->fb_len)
+ xenfb->height = xenfb->fb_len/xenfb->row_stride;
+ }
fprintf(stderr, "Framebuffer depth %d width %d height %d line %d\n",
fb_page->depth, fb_page->width, fb_page->height,
fb_page->line_length);
if (xenfb_map_fb(xenfb, xenfb->fb.otherend_id) < 0)
diff -r 1b013d10c6d1 tools/python/xen/xend/server/vfbif.py
--- a/tools/python/xen/xend/server/vfbif.py Mon Jan 28 10:37:08 2008 +0000
+++ b/tools/python/xen/xend/server/vfbif.py Mon Feb 04 08:32:10 2008 -0700
@@ -6,7 +6,7 @@ import os
import os
CONFIG_ENTRIES = ['type', 'vncdisplay', 'vnclisten', 'vncpasswd', 'vncunused',
- 'display', 'xauthority', 'keymap',
+ 'videoram', 'display', 'xauthority', 'keymap',
'uuid', 'location', 'protocol']
class VfbifController(DevController):
diff -r 1b013d10c6d1 tools/python/xen/xm/create.py
--- a/tools/python/xen/xm/create.py Mon Jan 28 10:37:08 2008 +0000
+++ b/tools/python/xen/xm/create.py Mon Feb 04 09:19:41 2008 -0700
@@ -490,6 +490,10 @@ gopts.var('vncunused', val='',
use="""Try to find an unused port for the VNC server.
Only valid when vnc=1.""")
+gopts.var('videoram', val='',
+ fn=set_value, default=None,
+ use="""Amount of videoram PV guest can allocate for frame buffer.""")
+
gopts.var('sdl', val='',
fn=set_value, default=None,
use="""Should the device model use SDL?""")
@@ -620,7 +624,7 @@ def configure_vfbs(config_devs, vals):
d['type'] = 'sdl'
for (k,v) in d.iteritems():
if not k in [ 'vnclisten', 'vncunused', 'vncdisplay', 'display',
- 'xauthority', 'type', 'vncpasswd' ]:
+ 'videoram', 'xauthority', 'type', 'vncpasswd' ]:
err("configuration option %s unknown to vfbs" % k)
config.append([k,v])
if not d.has_key("keymap"):
diff -r 1b013d10c6d1 xen/include/public/io/fbif.h
--- a/xen/include/public/io/fbif.h Mon Jan 28 10:37:08 2008 +0000
+++ b/xen/include/public/io/fbif.h Mon Feb 04 08:07:19 2008 -0700
@@ -50,12 +50,28 @@ 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; /* future */
+};
+
#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];
};
@@ -109,21 +125,13 @@ 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.
- */
-#ifdef __KERNEL__
-#define XENFB_WIDTH 800
-#define XENFB_HEIGHT 600
-#define XENFB_DEPTH 32
-#endif
#endif
diff -r 1b013d10c6d1 xen/include/public/io/kbdif.h
--- a/xen/include/public/io/kbdif.h Mon Jan 28 10:37:08 2008 +0000
+++ b/xen/include/public/io/kbdif.h Fri Feb 01 07:59:20 2008 -0700
@@ -119,6 +119,10 @@ struct xenkbd_page
uint32_t out_cons, out_prod;
};
+#ifdef __KERNEL__
+void xenkbd_set_ptr_geometry(int xres, int yres);
+#endif
+
#endif
/*
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