arch/x86/kernel/bios_uv.c

/*
 * BIOS run time interface routines.
 *
 *  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
 *
 *  Copyright (c) 2008 Silicon Graphics, Inc.  All Rights Reserved.
 *  Copyright (c) Russ Anderson
 */

#include <linux/efi.h>
#include <asm/efi.h>
#include <linux/io.h>
#include <asm/uv/bios.h>

struct uv_systab uv_systab;

s64 uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, u64 a4, u64 a5)
{
	struct uv_systab *tab = &uv_systab;

	if (!tab->function)
		/*
		 * BIOS does not support UV systab
		 */
		return BIOS_STATUS_UNIMPLEMENTED;

	return efi_call6((void *)__va(tab->function),
					(u64)which, a1, a2, a3, a4, a5);
}

s64 uv_bios_call_irqsave(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
					u64 a4, u64 a5)
{
	unsigned long bios_flags;
	s64 ret;

	local_irq_save(bios_flags);
	ret = uv_bios_call(which, a1, a2, a3, a4, a5);
	local_irq_restore(bios_flags);

	return ret;
}

s64 uv_bios_call_reentrant(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
					u64 a4, u64 a5)
{
	s64 ret;

	preempt_disable();
	ret = uv_bios_call(which, a1, a2, a3, a4, a5);
	preempt_enable();

	return ret;
}

long
x86_bios_freq_base(unsigned long clock_type, unsigned long *ticks_per_second,
					unsigned long *drift_info)
{
	return uv_bios_call(UV_BIOS_FREQ_BASE, clock_type,
				(u64)ticks_per_second, 0, 0, 0);
}
EXPORT_SYMBOL_GPL(x86_bios_freq_base);


#ifdef CONFIG_EFI
void uv_bios_init(void)
{
	struct uv_systab *tab;

	if ((efi.uv_systab == EFI_INVALID_TABLE_ADDR) ||
	    (efi.uv_systab == (unsigned long)NULL)) {
		printk(KERN_CRIT "No EFI UV System Table.\n");
		uv_systab.function = (unsigned long)NULL;
		return;
	}

	tab = (struct uv_systab *)ioremap(efi.uv_systab,
					sizeof(struct uv_systab));
	if (strncmp(tab->signature, "UVST", 4) != 0)
		printk(KERN_ERR "bad signature in UV system table!");

	/*
	 * Copy table to permanent spot for later use.
	 */
	memcpy(&uv_systab, tab, sizeof(struct uv_systab));
	iounmap(tab);

	printk(KERN_INFO "EFI UV System Table Revision %d\n", tab->revision);
}
#else	/* !CONFIG_EFI */

void uv_bios_init(void) { }
#endif