arch/ia64/xen/xen_pv_ops.c

/******************************************************************************
 * arch/ia64/xen/xen_pv_ops.c
 *
 * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
 *                    VA Linux Systems Japan K.K.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <linux/console.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/pm.h>

#include <asm/xen/hypervisor.h>
#include <asm/xen/xencomm.h>
#include <asm/xen/privop.h>

/***************************************************************************
 * general info
 */
static struct pv_info xen_info __initdata = {
	.kernel_rpl = 2,	/* or 1: determin at runtime */
	.paravirt_enabled = 1,
	.name = "Xen/ia64",
};

#define IA64_RSC_PL_SHIFT	2
#define IA64_RSC_PL_BIT_SIZE	2
#define IA64_RSC_PL_MASK	\
	(((1UL << IA64_RSC_PL_BIT_SIZE) - 1) << IA64_RSC_PL_SHIFT)

static void __init
xen_info_init(void)
{
	/* Xenified Linux/ia64 may run on pl = 1 or 2.
	 * determin at run time. */
	unsigned long rsc = ia64_getreg(_IA64_REG_AR_RSC);
	unsigned int rpl = (rsc & IA64_RSC_PL_MASK) >> IA64_RSC_PL_SHIFT;
	xen_info.kernel_rpl = rpl;
}

/***************************************************************************
 * pv_init_ops
 * initialization hooks.
 */

static void
xen_panic_hypercall(struct unw_frame_info *info, void *arg)
{
	current->thread.ksp = (__u64)info->sw - 16;
	HYPERVISOR_shutdown(SHUTDOWN_crash);
	/* we're never actually going to get here... */
}

static int
xen_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
{
	unw_init_running(xen_panic_hypercall, NULL);
	/* we're never actually going to get here... */
	return NOTIFY_DONE;
}

static struct notifier_block xen_panic_block = {
	xen_panic_event, NULL, 0 /* try to go last */
};

static void xen_pm_power_off(void)
{
	local_irq_disable();
	HYPERVISOR_shutdown(SHUTDOWN_poweroff);
}

static void __init
xen_banner(void)
{
	printk(KERN_INFO
	       "Running on Xen! pl = %d start_info_pfn=0x%lx nr_pages=%ld "
	       "flags=0x%x\n",
	       xen_info.kernel_rpl,
	       HYPERVISOR_shared_info->arch.start_info_pfn,
	       xen_start_info->nr_pages, xen_start_info->flags);
}

static int __init
xen_reserve_memory(struct rsvd_region *region)
{
	region->start = (unsigned long)__va(
		(HYPERVISOR_shared_info->arch.start_info_pfn << PAGE_SHIFT));
	region->end   = region->start + PAGE_SIZE;
	return 1;
}

static void __init
xen_arch_setup_early(void)
{
	struct shared_info *s;
	BUG_ON(!xen_pv_domain());

	s = HYPERVISOR_shared_info;
	xen_start_info = __va(s->arch.start_info_pfn << PAGE_SHIFT);

	/* Must be done before any hypercall.  */
	xencomm_initialize();

	xen_setup_features();
	/* Register a call for panic conditions. */
	atomic_notifier_chain_register(&panic_notifier_list,
				       &xen_panic_block);
	pm_power_off = xen_pm_power_off;

	xen_ia64_enable_opt_feature();
}

static void __init
xen_arch_setup_console(char **cmdline_p)
{
	add_preferred_console("xenboot", 0, NULL);
	add_preferred_console("tty", 0, NULL);
	/* use hvc_xen */
	add_preferred_console("hvc", 0, NULL);

#if !defined(CONFIG_VT) || !defined(CONFIG_DUMMY_CONSOLE)
	conswitchp = NULL;
#endif
}

static int __init
xen_arch_setup_nomca(void)
{
	return 1;
}

static void __init
xen_post_smp_prepare_boot_cpu(void)
{
	xen_setup_vcpu_info_placement();
}

static const struct pv_init_ops xen_init_ops __initdata = {
	.banner = xen_banner,

	.reserve_memory = xen_reserve_memory,

	.arch_setup_early = xen_arch_setup_early,
	.arch_setup_console = xen_arch_setup_console,
	.arch_setup_nomca = xen_arch_setup_nomca,

	.post_smp_prepare_boot_cpu = xen_post_smp_prepare_boot_cpu,
};

/***************************************************************************
 * pv_ops initialization
 */

void __init
xen_setup_pv_ops(void)
{
	xen_info_init();
	pv_info = xen_info;
	pv_init_ops = xen_init_ops;
}