vt: register the memory regions used by the vt drivers

Current VT drivers don't register the memory regions they use with the
nexus. This patch makes vt_vga and vt_efifb register the memory regions they
use.

This is needed (at least) for Xen support, since the FreeBSD kernel will try
to use the holes in the memory map to map memory from other domains and
setup it's grant table.

Sponsored by:		Citrix Systems R&D
Reported by:		sbruno
Tested by:		emaste
Reviewed by:		ray
PR:			195537
Differential Revision:	https://reviews.freebsd.org/D1291

2 files changed, 108 insertions, 0 deletions

diff --git a/sys/dev/vt/hw/efifb/efifb.c b/sys/dev/vt/hw/efifb/efifb.c
index 05b2d79..7695547 100644
--- a/sys/dev/vt/hw/efifb/efifb.c
+++ b/sys/dev/vt/hw/efifb/efifb.c
@@ -37,6 +37,9 @@ __FBSDID("$FreeBSD$");
 #include <sys/kernel.h>
 #include <sys/fbio.h>
 #include <sys/linker.h>
+#include <sys/bus.h>
+#include <sys/module.h>
+#include <sys/rman.h>
 
 #include "opt_platform.h"
 
@@ -179,3 +182,53 @@ vt_efifb_remap(void *xinfo)
 	    info->fb_size, VM_MEMATTR_WRITE_COMBINING);
 }
 
+/* Dummy NewBus functions to reserve the resources used by the efifb driver */
+static void
+vtefifb_identify(driver_t *driver, device_t parent)
+{
+
+	if (local_info.fb_pbase == 0 || local_info.fb_size == 0)
+		return;
+
+	if (BUS_ADD_CHILD(parent, 0, driver->name, 0) == NULL)
+		panic("Unable to attach vt_efifb console");
+}
+
+static int
+vtefifb_probe(device_t dev)
+{
+
+	device_set_desc(dev, "vt_efifb driver");
+	return (BUS_PROBE_NOWILDCARD);
+}
+
+static int
+vtefifb_attach(device_t dev)
+{
+	struct resource *pseudo_phys_res;
+	int res_id;
+
+	res_id = 0;
+	pseudo_phys_res = bus_alloc_resource(dev, SYS_RES_MEMORY,
+	    &res_id, local_info.fb_pbase,
+	    local_info.fb_pbase + local_info.fb_size,
+	    local_info.fb_size, RF_ACTIVE);
+	if (pseudo_phys_res == NULL)
+		panic("Unable to reserve vt_efifb memory");
+	return (0);
+}
+
+/*-------------------- Private Device Attachment Data  -----------------------*/
+static device_method_t vtefifb_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_identify,	vtefifb_identify),
+	DEVMETHOD(device_probe,         vtefifb_probe),
+	DEVMETHOD(device_attach,        vtefifb_attach),
+
+	DEVMETHOD_END
+};
+
+DEFINE_CLASS_0(vtefifb, vtefifb_driver, vtefifb_methods, 0);
+devclass_t vtefifb_devclass;
+
+DRIVER_MODULE(vtefifb, nexus, vtefifb_driver, vtefifb_devclass, NULL, NULL);
diff --git a/sys/dev/vt/hw/vga/vt_vga.c b/sys/dev/vt/hw/vga/vt_vga.c
index abddbf5..7f35053 100644
--- a/sys/dev/vt/hw/vga/vt_vga.c
+++ b/sys/dev/vt/hw/vga/vt_vga.c
@@ -36,6 +36,9 @@ __FBSDID("$FreeBSD$");
 #include <sys/param.h>
 #include <sys/kernel.h>
 #include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/module.h>
+#include <sys/rman.h>
 
 #include <dev/vt/vt.h>
 #include <dev/vt/hw/vga/vt_vga_reg.h>
@@ -56,6 +59,7 @@ struct vga_softc {
 	bus_space_handle_t	 vga_reg_handle;
 	int			 vga_wmode;
 	term_color_t		 vga_curfg, vga_curbg;
+	boolean_t		 vga_enabled;
 };
 
 /* Convenience macros. */
@@ -1228,6 +1232,7 @@ vga_init(struct vt_device *vd)
 		vd->vd_height = VT_VGA_HEIGHT;
 	}
 	vga_initialize(vd, textmode);
+	sc->vga_enabled = true;
 
 	return (CN_INTERNAL);
 }
@@ -1241,3 +1246,53 @@ vga_postswitch(struct vt_device *vd)
 	/* Ask vt(9) to update chars on visible area. */
 	vd->vd_flags |= VDF_INVALID;
 }
+
+/* Dummy NewBus functions to reserve the resources used by the vt_vga driver */
+static void
+vtvga_identify(driver_t *driver, device_t parent)
+{
+
+	if (!vga_conssoftc.vga_enabled)
+		return;
+
+	if (BUS_ADD_CHILD(parent, 0, driver->name, 0) == NULL)
+		panic("Unable to attach vt_vga console");
+}
+
+static int
+vtvga_probe(device_t dev)
+{
+
+	device_set_desc(dev, "vt_vga driver");
+	return (BUS_PROBE_NOWILDCARD);
+}
+
+static int
+vtvga_attach(device_t dev)
+{
+	struct resource *pseudo_phys_res;
+	int res_id;
+
+	res_id = 0;
+	pseudo_phys_res = bus_alloc_resource(dev, SYS_RES_MEMORY,
+	    &res_id, VGA_MEM_BASE, VGA_MEM_BASE + VGA_MEM_SIZE,
+	    VGA_MEM_SIZE, RF_ACTIVE);
+	if (pseudo_phys_res == NULL)
+		panic("Unable to reserve vt_vga memory");
+	return (0);
+}
+
+/*-------------------- Private Device Attachment Data  -----------------------*/
+static device_method_t vtvga_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_identify,	vtvga_identify),
+	DEVMETHOD(device_probe,         vtvga_probe),
+	DEVMETHOD(device_attach,        vtvga_attach),
+
+	DEVMETHOD_END
+};
+
+DEFINE_CLASS_0(vtvga, vtvga_driver, vtvga_methods, 0);
+devclass_t vtvga_devclass;
+
+DRIVER_MODULE(vtvga, nexus, vtvga_driver, vtvga_devclass, NULL, NULL);