Differential D15705 Diff 45788 head/sys/powerpc/ofw/ofw_initrd.c

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head/sys/powerpc/ofw/ofw_initrd.c

Property	Old Value	New Value
svn:keywords	null	FreeBSD=%H \ No newline at end of property

				/*-
				* Copyright (C) 2018 Breno Leitao
				*
				* Redistribution and use in source and binary forms, with or without
				* modification, are permitted provided that the following conditions
				* are met:
				* 1. Redistributions of source code must retain the above copyright
				* notice, this list of conditions and the following disclaimer.
				* 2. Redistributions in binary form must reproduce the above copyright
				* notice, this list of conditions and the following disclaimer in the
				* documentation and/or other materials provided with the distribution.
				*
				* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
				* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
				* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
				* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
				* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
				* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
				* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
				* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
				* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
				* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
				*/

				#include <sys/cdefs.h>
				__FBSDID("$FreeBSD$");

				#include <sys/param.h>
				#include <sys/kernel.h>
				#include <sys/systm.h>
				#include <sys/module.h>
				#include <sys/types.h>
				#include <sys/proc.h>

				#include <vm/vm.h>
				#include <vm/pmap.h>

				#include <machine/bus.h>

				#include <dev/ofw/openfirm.h>
				#include <dev/ofw/ofw_bus.h>
				#include <dev/ofw/ofw_bus_subr.h>

				#include "opt_md.h"

				#ifdef MD_ROOT_MEM
				extern u_char *mfs_root;
				extern uint32_t mfs_root_size;
				#else
				#warning "MD_ROOT_MEM should be set to use ofw initrd as a md device"
				#endif

				/* bus entry points */
				static int ofw_initrd_probe(device_t dev);
				static int ofw_initrd_attach(device_t dev);
				static void ofw_initrd_identify(driver_t *driver, device_t parent);

				struct ofw_initrd_softc {
				device_t sc_dev;
				vm_paddr_t start;
				vm_paddr_t end;
				};

				static int
				ofw_initrd_probe(device_t dev)
				{
				phandle_t chosen;

				/* limit this device to one unit */
				if (device_get_unit(dev) != 0)
				return (ENXIO);

				chosen = OF_finddevice("/chosen");
				if (chosen <= 0) {
				return (ENXIO);
				}

				if (!OF_hasprop(chosen, "linux,initrd-start") \|\|
				!OF_hasprop(chosen, "linux,initrd-end"))
				return (ENXIO);

				device_set_desc(dev, "OFW initrd memregion loader");
				return (BUS_PROBE_DEFAULT);
				}

				static int
				ofw_initrd_attach(device_t dev)
				{
				struct ofw_initrd_softc *sc;
				vm_paddr_t start, end;
				phandle_t chosen;
				pcell_t cell[2];
				ssize_t size;

				sc = device_get_softc(dev);

				chosen = OF_finddevice("/chosen");
				if (chosen <= 0) {
				device_printf(dev, "/chosen not found\n");
				return (ENXIO);
				}

				size = OF_getencprop(chosen, "linux,initrd-start", cell, sizeof(cell));
				if (size == 4)
				start = cell[0];
				else if (size == 8)
				start = (uint64_t)cell[0] << 32 \| cell[1];
				else {
				device_printf(dev, "Wrong linux,initrd-start size\n");
				return (ENXIO);
				}

				size = OF_getencprop(chosen, "linux,initrd-end", cell, sizeof(cell));
				if (size == 4)
				end = cell[0];
				else if (size == 8)
				end = (uint64_t)cell[0] << 32 \| cell[1];
				else{
				device_printf(dev, "Wrong linux,initrd-end size\n");
				return (ENXIO);
				}

				if (end - start > 0) {
				mfs_root = (u_char *) PHYS_TO_DMAP(start);
				mfs_root_size = end - start;

				return (0);
				}

				return (ENXIO);
				}

				static void
				ofw_initrd_identify(driver_t *driver, device_t parent)
				{
				if (device_find_child(parent, "initrd", -1) != NULL)
				return;

				if (BUS_ADD_CHILD(parent, 10, "initrd", -1) == NULL)
				device_printf(parent, "add ofw_initrd child failed\n");
				}

				static device_method_t ofw_initrd_methods[] = {
				DEVMETHOD(device_identify, ofw_initrd_identify),
				DEVMETHOD(device_probe, ofw_initrd_probe),
				DEVMETHOD(device_attach, ofw_initrd_attach),
				DEVMETHOD_END
				};

				static driver_t ofw_initrd_driver = {
				"ofw_initrd",
				ofw_initrd_methods,
				sizeof(struct ofw_initrd_softc)
				};

				static devclass_t ofw_initrd_devclass;

				DRIVER_MODULE(ofw_initrd, ofwbus, ofw_initrd_driver, ofw_initrd_devclass,
				NULL, NULL);