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Add hw.fdt sysctl node.

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Make FDT blob available via opaque hw.fdt.dtb sysctl, if a DTB has been
installed by the time sysctls are registered.

Reviewed by:	andrew
Approved by:	sjg (mentor)
Sponsored by:	Juniper Networks, Inc.
Differential Revision:	https://reviews.freebsd.org/D7411
This commit is contained in:
Stephen J. Kiernan 2016-08-06 18:48:47 +00:00
parent 0ba0d8a6ca
commit a183d81dc9
3 changed files with 27 additions and 0 deletions
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3
sys/dev/fdt/fdt_common.c
View File

@ -38,6 +38,7 @@ __FBSDID("$FreeBSD$");
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/limits.h>
#include <sys/sysctl.h>
#include <machine/resource.h>
@ -60,6 +61,8 @@ __FBSDID("$FreeBSD$");
#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;

3
sys/dev/fdt/fdt_common.h
View File

@ -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 struct fdt_pm_mask_entry fdt_pm_mask_table[];
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 *);

21
sys/dev/ofw/ofw_fdt.c
View File

@ -95,6 +95,27 @@ OFW_DEF(ofw_fdt);
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)
{