[deliverable/linux.git] / 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
Commit	Line	Data
7019cc2d RA	1	/*
	2	* BIOS run time interface routines.
	3	*
7019cc2d RA	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation; either version 2 of the License, or
	7	* (at your option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
7f594232 RA	17	*
	18	* Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
	19	* Copyright (c) Russ Anderson
7019cc2d RA	20	*/
7019cc2d RA	21
7f594232 RA	22	#include <linux/efi.h>
	23	#include <asm/efi.h>
	24	#include <linux/io.h>
7019cc2d RA	25	#include <asm/uv/bios.h>
7019cc2d RA	26
7f594232 RA	27	struct uv_systab uv_systab;
	28
	29	s64 uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, u64 a4, u64 a5)
7019cc2d	30	{
7f594232 RA	31	struct uv_systab *tab = &uv_systab;
	32
	33	if (!tab->function)
	34	/*
	35	* BIOS does not support UV systab
	36	*/
	37	return BIOS_STATUS_UNIMPLEMENTED;
	38
	39	return efi_call6((void *)__va(tab->function),
	40	(u64)which, a1, a2, a3, a4, a5);
7019cc2d RA	41	}
7019cc2d RA	42
7f594232 RA	43	s64 uv_bios_call_irqsave(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
7f594232 RA	44	u64 a4, u64 a5)
7019cc2d	45	{
7f594232 RA	46	unsigned long bios_flags;
	47	s64 ret;
	48
	49	local_irq_save(bios_flags);
	50	ret = uv_bios_call(which, a1, a2, a3, a4, a5);
	51	local_irq_restore(bios_flags);
	52
	53	return ret;
	54	}
	55
	56	s64 uv_bios_call_reentrant(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
	57	u64 a4, u64 a5)
	58	{
	59	s64 ret;
	60
	61	preempt_disable();
	62	ret = uv_bios_call(which, a1, a2, a3, a4, a5);
	63	preempt_enable();
7019cc2d	64
7f594232 RA	65	return ret;
	66	}
	67
	68	long
	69	x86_bios_freq_base(unsigned long clock_type, unsigned long *ticks_per_second,
	70	unsigned long *drift_info)
	71	{
	72	return uv_bios_call(UV_BIOS_FREQ_BASE, clock_type,
	73	(u64)ticks_per_second, 0, 0, 0);
7019cc2d RA	74	}
7019cc2d RA	75	EXPORT_SYMBOL_GPL(x86_bios_freq_base);
7f594232 RA	76
	77
	78	#ifdef CONFIG_EFI
	79	void uv_bios_init(void)
	80	{
	81	struct uv_systab *tab;
	82
	83	if ((efi.uv_systab == EFI_INVALID_TABLE_ADDR) \|\|
	84	(efi.uv_systab == (unsigned long)NULL)) {
	85	printk(KERN_CRIT "No EFI UV System Table.\n");
	86	uv_systab.function = (unsigned long)NULL;
	87	return;
	88	}
	89
	90	tab = (struct uv_systab *)ioremap(efi.uv_systab,
	91	sizeof(struct uv_systab));
	92	if (strncmp(tab->signature, "UVST", 4) != 0)
	93	printk(KERN_ERR "bad signature in UV system table!");
	94
	95	/*
	96	* Copy table to permanent spot for later use.
	97	*/
	98	memcpy(&uv_systab, tab, sizeof(struct uv_systab));
	99	iounmap(tab);
	100
	101	printk(KERN_INFO "EFI UV System Table Revision %d\n", tab->revision);
	102	}
	103	#else /* !CONFIG_EFI */
	104
	105	void uv_bios_init(void) { }
	106	#endif
	107