/* Process the frontend framebuffer config */
static int xenfb_read_frontend_fb_config(struct xenfb *xenfb) {
struct xenfb_page *fb_page;
int val;
int videoram;
if (xenfb_xs_scanf1(xenfb->xsh, xenfb->fb.otherend, "feature-update",
"%d", &val) < 0)
val = 0;
if (!val) {
fprintf(stderr, "feature-update not supported\n");
errno = ENOTSUP;
return -1;
}
if (xenfb_xs_scanf1(xenfb->xsh, xenfb->fb.otherend, "protocol", "%63s",
xenfb->protocol) < 0)
xenfb->protocol[0] = '\0';
xenfb_xs_printf(xenfb->xsh, xenfb->fb.nodename, "request-update", "1");
xenfb->refresh_period = -1;
if (xenfb_xs_scanf1(xenfb->xsh, xenfb->fb.nodename, "videoram", "%d",
&videoram) < 0)
videoram = 0;
fb_page = xenfb->fb.page;
if (xenfb_configure_fb(xenfb, videoram * 1024 * 1024U,
fb_page->width, fb_page->height, fb_page->depth,
fb_page->mem_length, 0, fb_page->line_length)
< 0) {
errno = EINVAL;
return -1;
}
if (xenfb_map_fb(xenfb, xenfb->fb.otherend_id) < 0)
return -1;
/* Indicate we have the frame buffer resize feature */
xenfb_xs_printf(xenfb->xsh, xenfb->fb.nodename, "feature-resize", "1");
/* Tell kbd pointer the screen geometry */
xenfb_xs_printf(xenfb->xsh, xenfb->kbd.nodename, "width", "%d", xenfb->width);
xenfb_xs_printf(xenfb->xsh, xenfb->kbd.nodename, "height", "%d", xenfb->height);
if (xenfb_switch_state(&xenfb->fb, XenbusStateConnected))
return -1;
if (xenfb_switch_state(&xenfb->kbd, XenbusStateConnected))
return -1;
return 0;
}
static int xenfb_hotplug(struct xenfb_device *dev)
{
if (xenfb_xs_printf(dev->xenfb->xsh, dev->nodename,
"hotplug-status", "connected"))
return -1;
return 0;
}
static int xenfb_switch_state(struct xenfb_device *dev,
enum xenbus_state state)
{
struct xs_handle *xsh = dev->xenfb->xsh;
if (xenfb_xs_printf(xsh, dev->nodename, "state", "%d", state) < 0)
return -1;
dev->state = state;
return 0;
}
/* Callback invoked while waiting for KBD backend to change
* to the created state */
static void xenfb_backend_created_kbd(void *opaque)
{
struct xenfb_device *dev = (struct xenfb_device *)opaque;
int ret = xenfb_backend_created(dev);
if (ret < 0) {
xenfb_shutdown(dev->xenfb);
exit(1);
}
if (ret)
return; /* Still waiting */
if (xenfb_xs_printf(dev->xenfb->xsh, dev->nodename, "feature-abs-pointer", "1")) {
xenfb_shutdown(dev->xenfb);
exit(1);
}
fprintf(stderr, "FB: Waiting for FB backend creation\n");
xenfb_wait_for_backend(&dev->xenfb->fb, xenfb_backend_created_fb);
}
/* Process the frontend framebuffer config */
static int xenfb_read_frontend_fb_config(struct xenfb *xenfb) {
struct xenfb_page *fb_page;
int val;
if (xenfb_xs_scanf1(xenfb->xsh, xenfb->fb.otherend, "feature-update",
"%d", &val) < 0)
val = 0;
if (!val) {
fprintf(stderr, "feature-update not supported\n");
errno = ENOTSUP;
return -1;
}
if (xenfb_xs_scanf1(xenfb->xsh, xenfb->fb.otherend, "protocol", "%63s",
xenfb->protocol) < 0)
xenfb->protocol[0] = '\0';
xenfb_xs_printf(xenfb->xsh, xenfb->fb.nodename, "request-update", "1");
/* TODO check for permitted ranges */
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;
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)
return -1;
if (xenfb_switch_state(&xenfb->fb, XenbusStateConnected))
return -1;
if (xenfb_switch_state(&xenfb->kbd, XenbusStateConnected))
return -1;
return 0;
}