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diff --git a/sys/kern/subr_physmem.c b/sys/kern/subr_physmem.c
--- a/sys/kern/subr_physmem.c
+++ b/sys/kern/subr_physmem.c
@@ -40,7 +40,9 @@
#include <sys/param.h>
#include <sys/systm.h>
+#include <sys/bus.h>
#include <sys/kernel.h>
+#include <sys/module.h>
#include <sys/physmem.h>
#ifdef _KERNEL
@@ -49,7 +51,9 @@
#include <vm/vm_page.h>
#include <vm/vm_phys.h>
#include <vm/vm_dumpset.h>
+
#include <machine/md_var.h>
+#include <machine/resource.h>
#else
#include <stdarg.h>
#include <stdio.h>
@@ -524,7 +528,6 @@
panic("No memory entries in phys_avail");
Maxmem = atop(phys_avail[nextidx - 1]);
}
-#endif
#ifdef DDB
#include <ddb/ddb.h>
@@ -536,3 +539,98 @@
}
#endif /* DDB */
+
+/*
+ * ram pseudo driver - this reserves I/O space resources corresponding to physical
+ * memory regions.
+ */
+
+static void
+ram_identify(driver_t *driver, device_t parent)
+{
+
+ if (resource_disabled("ram", 0))
+ return;
+ if (BUS_ADD_CHILD(parent, 0, "ram", 0) == NULL)
+ panic("ram_identify");
+}
+
+static int
+ram_probe(device_t dev)
+{
+
+ device_quiet(dev);
+ device_set_desc(dev, "System RAM");
+ return (BUS_PROBE_SPECIFIC);
+}
+
+static int
+ram_attach(device_t dev)
+{
+ vm_paddr_t avail_list[PHYS_AVAIL_COUNT];
+ rman_res_t start, end;
+ struct region *hwp;
+ int rid, i;
+
+ rid = 0;
+
+ /* Get the avail list. */
+ bzero(avail_list, sizeof(avail_list));
+ regions_to_avail(avail_list, EXFLAG_NOALLOC | EXFLAG_NODUMP,
+ PHYS_AVAIL_COUNT, 0, NULL, NULL);
+
+ /* Reserve all memory regions. */
+ for (i = 0; avail_list[i + 1] != 0; i += 2) {
+ start = avail_list[i];
+ end = avail_list[i + 1];
+
+ if (bootverbose)
+ device_printf(dev,
+ "reserving memory region: %jx-%jx\n",
+ (uintmax_t)start, (uintmax_t)end);
+
+ if (bus_alloc_resource(dev, SYS_RES_MEMORY, &rid, start, end,
+ end - start, 0) == NULL)
+ panic("ram_attach: resource %d failed to attach", rid);
+ rid++;
+ }
+
+ /* Now, reserve the excluded memory regions. */
+ for (i = 0, hwp = exregions; i < excnt; i++, hwp++) {
+ start = hwp->addr;
+ end = hwp->addr + hwp->size;
+
+ if (bootverbose)
+ device_printf(dev,
+ "reserving excluded region: %jx-%jx\n",
+ (uintmax_t)start, (uintmax_t)(end - 1));
+
+ /*
+ * Best-effort attempt to reserve the range. This may fail, as
+ * sometimes the excluded ranges provided by the device tree
+ * will cover or overlap some I/O range.
+ */
+ if (bus_alloc_resource(dev, SYS_RES_MEMORY, &rid, start, end,
+ end - start, 0) == NULL) {
+ if (bootverbose)
+ device_printf(dev, "failed to reserve region\n");
+ continue;
+ }
+ rid++;
+ }
+
+ return (0);
+}
+
+static device_method_t ram_methods[] = {
+ /* Device interface */
+ DEVMETHOD(device_identify, ram_identify),
+ DEVMETHOD(device_probe, ram_probe),
+ DEVMETHOD(device_attach, ram_attach),
+
+ DEVMETHOD_END
+};
+
+DEFINE_CLASS_0(ram, ram_driver, ram_methods, /* no softc */ 1);
+DRIVER_MODULE(ram, nexus, ram_driver, 0, 0);
+#endif /* _KERNEL */

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