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Index: head/sys/dev/fdt/fdt_common.h
===================================================================
--- head/sys/dev/fdt/fdt_common.h
+++ head/sys/dev/fdt/fdt_common.h
@@ -32,6 +32,7 @@
#ifndef _FDT_COMMON_H_
#define _FDT_COMMON_H_
+#include <sys/sysctl.h>
#include <sys/slicer.h>
#include <contrib/libfdt/libfdt_env.h>
#include <dev/ofw/ofw_bus.h>
@@ -80,6 +81,8 @@
extern u_char fdt_static_dtb;
#endif
+SYSCTL_DECL(_hw_fdt);
+
int fdt_addrsize_cells(phandle_t, int *, int *);
u_long fdt_data_get(void *, int);
int fdt_data_to_res(pcell_t *, int, int, u_long *, u_long *);
Index: head/sys/dev/fdt/fdt_common.c
===================================================================
--- head/sys/dev/fdt/fdt_common.c
+++ head/sys/dev/fdt/fdt_common.c
@@ -38,6 +38,7 @@
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/limits.h>
+#include <sys/sysctl.h>
#include <machine/resource.h>
@@ -60,6 +61,8 @@
#define FDT_REG_CELLS 4
+SYSCTL_NODE(_hw, OID_AUTO, fdt, CTLFLAG_RD, 0, "Flattened Device Tree");
+
vm_paddr_t fdt_immr_pa;
vm_offset_t fdt_immr_va;
vm_offset_t fdt_immr_size;
Index: head/sys/dev/ofw/ofw_fdt.c
===================================================================
--- head/sys/dev/ofw/ofw_fdt.c
+++ head/sys/dev/ofw/ofw_fdt.c
@@ -96,6 +96,27 @@
static void *fdtp = NULL;
static int
+sysctl_handle_dtb(SYSCTL_HANDLER_ARGS)
+{
+
+ return (sysctl_handle_opaque(oidp, fdtp, fdt_totalsize(fdtp), req));
+}
+
+static void
+sysctl_register_fdt_oid(void *arg)
+{
+
+ /* If there is no FDT registered, skip adding the sysctl */
+ if (fdtp == NULL)
+ return;
+
+ SYSCTL_ADD_PROC(NULL, SYSCTL_STATIC_CHILDREN(_hw_fdt), OID_AUTO, "dtb",
+ CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0, sysctl_handle_dtb, "",
+ "Device Tree Blob");
+}
+SYSINIT(dtb_oid, SI_SUB_KMEM, SI_ORDER_ANY, sysctl_register_fdt_oid, 0);
+
+static int
ofw_fdt_init(ofw_t ofw, void *data)
{
int err;

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