/*
 *	Machine specific setup for generic
 */

#include <linux/smp.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <asm/acpi.h>
#include <asm/arch_hooks.h>
#include <asm/e820.h>
#include <asm/setup.h>
#include <asm/fixmap.h>

#include <xen/interface/callback.h>
#include <xen/interface/memory.h>

#ifdef CONFIG_HOTPLUG_CPU
#define DEFAULT_SEND_IPI	(1)
#else
#define DEFAULT_SEND_IPI	(0)
#endif

int no_broadcast=DEFAULT_SEND_IPI;

static __init int no_ipi_broadcast(char *str)
{
	get_option(&str, &no_broadcast);
	printk ("Using %s mode\n", no_broadcast ? "No IPI Broadcast" :
											"IPI Broadcast");
	return 1;
}

__setup("no_ipi_broadcast", no_ipi_broadcast);

static int __init print_ipi_mode(void)
{
	printk ("Using IPI %s mode\n", no_broadcast ? "No-Shortcut" :
											"Shortcut");
	return 0;
}

late_initcall(print_ipi_mode);

/**
 * machine_specific_memory_setup - Hook for machine specific memory setup.
 *
 * Description:
 *	This is included late in kernel/setup.c so that it can make
 *	use of all of the static functions.
 **/

char * __init machine_specific_memory_setup(void)
{
	int rc;
	struct xen_memory_map memmap;
	/*
	 * This is rather large for a stack variable but this early in
	 * the boot process we know we have plenty slack space.
	 */
	struct e820entry map[E820MAX];

	memmap.nr_entries = E820MAX;
	set_xen_guest_handle(memmap.buffer, map);

	rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
	if ( rc == -ENOSYS ) {
		memmap.nr_entries = 1;
		map[0].addr = 0ULL;
		map[0].size = PFN_PHYS(xen_start_info->nr_pages);
		/* 8MB slack (to balance backend allocations). */
		map[0].size += 8ULL << 20;
		map[0].type = E820_RAM;
		rc = 0;
	}
	BUG_ON(rc);

	sanitize_e820_map(map, (char *)&memmap.nr_entries);

	BUG_ON(copy_e820_map(map, (char)memmap.nr_entries) < 0);

	return "Xen";
}

extern void hypervisor_callback(void);
extern void failsafe_callback(void);
extern void nmi(void);

unsigned long *machine_to_phys_mapping;
EXPORT_SYMBOL(machine_to_phys_mapping);
unsigned int machine_to_phys_order;
EXPORT_SYMBOL(machine_to_phys_order);

void __init machine_specific_arch_setup(void)
{
	int ret;
	struct xen_machphys_mapping mapping;
	unsigned long machine_to_phys_nr_ents;
	struct xen_platform_parameters pp;
	struct callback_register event = {
		.type = CALLBACKTYPE_event,
		.address = { __KERNEL_CS, (unsigned long)hypervisor_callback },
	};
	struct callback_register failsafe = {
		.type = CALLBACKTYPE_failsafe,
		.address = { __KERNEL_CS, (unsigned long)failsafe_callback },
	};
	struct callback_register nmi_cb = {
		.type = CALLBACKTYPE_nmi,
		.address = { __KERNEL_CS, (unsigned long)nmi },
	};

	ret = HYPERVISOR_callback_op(CALLBACKOP_register, &event);
	if (ret == 0)
		ret = HYPERVISOR_callback_op(CALLBACKOP_register, &failsafe);
	if (ret == -ENOSYS)
		ret = HYPERVISOR_set_callbacks(
			event.address.cs, event.address.eip,
			failsafe.address.cs, failsafe.address.eip);
	BUG_ON(ret);

	ret = HYPERVISOR_callback_op(CALLBACKOP_register, &nmi_cb);
	if (ret == -ENOSYS) {
		struct xennmi_callback cb;

		cb.handler_address = nmi_cb.address.eip;
		HYPERVISOR_nmi_op(XENNMI_register_callback, &cb);
	}

	if (HYPERVISOR_xen_version(XENVER_platform_parameters,
				   &pp) == 0)
		set_fixaddr_top(pp.virt_start - PAGE_SIZE);

	machine_to_phys_mapping = (unsigned long *)MACH2PHYS_VIRT_START;
	machine_to_phys_nr_ents = MACH2PHYS_NR_ENTRIES;
	if (HYPERVISOR_memory_op(XENMEM_machphys_mapping, &mapping) == 0) {
		machine_to_phys_mapping = (unsigned long *)mapping.v_start;
		machine_to_phys_nr_ents = mapping.max_mfn + 1;
	}
	while ((1UL << machine_to_phys_order) < machine_to_phys_nr_ents )
		machine_to_phys_order++;
}

/**
 * pre_setup_arch_hook - hook called prior to any setup_arch() execution
 *
 * Description:
 *	generally used to activate any machine specific identification
 *	routines that may be needed before setup_arch() runs.  On VISWS
 *	this is used to get the board revision and type.
 **/
void __init pre_setup_arch_hook(void)
{
	int max_cmdline;

	if ((max_cmdline = MAX_GUEST_CMDLINE) > COMMAND_LINE_SIZE)
		max_cmdline = COMMAND_LINE_SIZE;
	memcpy(saved_command_line, xen_start_info->cmd_line, max_cmdline);
	/* Save unparsed command line copy for /proc/cmdline */
	saved_command_line[max_cmdline-1] = '\0';
}