powerpc/powerpc/platform.c

/*-
 * Copyright (c) 2005 Peter Grehan
 * Copyright (c) 2009 Nathan Whitehorn
 * All rights reserved.
 *
 * 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 AND CONTRIBUTORS ``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 THE AUTHOR OR CONTRIBUTORS 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: stable/9/sys/powerpc/powerpc/platform.c 221988 2011-05-16 15:20:54Z nwhitehorn $");

/*
 * Dispatch platform calls to the appropriate platform implementation
 * through a previously registered kernel object.
 */

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/ktr.h>
#include <sys/mutex.h>
#include <sys/systm.h>
#include <sys/smp.h>
#include <sys/sysctl.h>
#include <sys/types.h>

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

#include <machine/cpu.h>
#include <machine/md_var.h>
#include <machine/platform.h>
#include <machine/platformvar.h>
#include <machine/smp.h>

#include "platform_if.h"

static platform_def_t	*plat_def_impl;
static platform_t	plat_obj;
static struct kobj_ops	plat_kernel_kops;
static struct platform_kobj	plat_kernel_obj;

static char plat_name[64] = "";
SYSCTL_STRING(_hw, OID_AUTO, platform, CTLFLAG_RD | CTLFLAG_TUN,
    plat_name, 0, "Platform currently in use");

static struct mem_region *pregions = NULL;
static struct mem_region *aregions = NULL;
static int npregions, naregions;

void
mem_regions(struct mem_region **phys, int *physsz, struct mem_region **avail,
    int *availsz)
{
	if (pregions == NULL)
		PLATFORM_MEM_REGIONS(plat_obj, &pregions, &npregions,
		    &aregions, &naregions);

	*phys = pregions;
	*avail = aregions;
	*physsz = npregions;
	*availsz = naregions;
}

int
mem_valid(vm_offset_t addr, int len)
{
	int i;

	if (pregions == NULL)
		PLATFORM_MEM_REGIONS(plat_obj, &pregions, &npregions,
		    &aregions, &naregions);

	for (i = 0; i < npregions; i++)
		if ((addr >= pregions[i].mr_start)
		   && (addr + len <= pregions[i].mr_start + pregions[i].mr_size))
			return (0);

	return (EFAULT);
}

vm_offset_t
platform_real_maxaddr(void)
{
	return (PLATFORM_REAL_MAXADDR(plat_obj));
}

const char *
installed_platform()
{
	return (plat_def_impl->name);
}

u_long
platform_timebase_freq(struct cpuref *cpu)
{
	return (PLATFORM_TIMEBASE_FREQ(plat_obj, cpu));
}

int
platform_smp_first_cpu(struct cpuref *cpu)
{
	return (PLATFORM_SMP_FIRST_CPU(plat_obj, cpu));
}

int
platform_smp_next_cpu(struct cpuref *cpu)
{
	return (PLATFORM_SMP_NEXT_CPU(plat_obj, cpu));
}

int
platform_smp_get_bsp(struct cpuref *cpu)
{
	return (PLATFORM_SMP_GET_BSP(plat_obj, cpu));
}

int
platform_smp_start_cpu(struct pcpu *cpu)
{
	return (PLATFORM_SMP_START_CPU(plat_obj, cpu));
}

#ifdef SMP
struct cpu_group *
cpu_topo(void)
{
        return (PLATFORM_SMP_TOPO(plat_obj));
}
#endif

/*
 * Reset back to firmware.
 */
void
cpu_reset()
{
        PLATFORM_RESET(plat_obj);
}

/*
 * Platform install routines. Highest priority wins, using the same
 * algorithm as bus attachment.
 */
SET_DECLARE(platform_set, platform_def_t);

void
platform_probe_and_attach()
{
	platform_def_t	**platpp, *platp;
	int		prio, best_prio;

	plat_obj = &plat_kernel_obj;
	best_prio = 0;

	/*
	 * Try to locate the best platform kobj
	 */
	SET_FOREACH(platpp, platform_set) {
		platp = *platpp;

		/*
		 * Take care of compiling the selected class, and
		 * then statically initialise the MMU object
		 */
		kobj_class_compile_static(platp, &plat_kernel_kops);
		kobj_init((kobj_t)plat_obj, platp);

		prio = PLATFORM_PROBE(plat_obj);

		/* Check for errors */
		if (prio > 0)
			continue;

		/*
		 * Check if this module was specifically requested through
		 * the loader tunable we provide.
		 */
		if (strcmp(platp->name,plat_name) == 0) {
			plat_def_impl = platp;
			break;
		}

		/* Otherwise, see if it is better than our current best */
		if (plat_def_impl == NULL || prio > best_prio) {
			best_prio = prio;
			plat_def_impl = platp;
		}

		/*
		 * We can't free the KOBJ, since it is static. Reset the ops
		 * member of this class so that we can come back later.
		 */
		platp->ops = NULL;
	}

	if (plat_def_impl == NULL)
		panic("No platform module found!");

	/*
	 * Recompile to make sure we ended with the
	 * correct one, and then attach.
	 */

	kobj_class_compile_static(plat_def_impl, &plat_kernel_kops);
	kobj_init((kobj_t)plat_obj, plat_def_impl);

	strlcpy(plat_name,plat_def_impl->name,sizeof(plat_name));

	PLATFORM_ATTACH(plat_obj);
}