[deliverable/linux.git] / arch / frv / mm / highmem.c

/* highmem.c: arch-specific highmem stuff
 *
 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * 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.
 */
#include <linux/highmem.h>
#include <linux/module.h>

void *kmap(struct page *page)
{
	might_sleep();
	if (!PageHighMem(page))
		return page_address(page);
	return kmap_high(page);
}

EXPORT_SYMBOL(kmap);

void kunmap(struct page *page)
{
	if (in_interrupt())
		BUG();
	if (!PageHighMem(page))
		return;
	kunmap_high(page);
}

EXPORT_SYMBOL(kunmap);

void *kmap_atomic(struct page *page)
{
	unsigned long paddr;
	int type;

	preempt_disable();
	pagefault_disable();
	type = kmap_atomic_idx_push();
	paddr = page_to_phys(page);

	switch (type) {
	/*
	 * The first 4 primary maps are reserved for architecture code
	 */
	case 0:		return __kmap_atomic_primary(0, paddr, 6);
	case 1:		return __kmap_atomic_primary(0, paddr, 7);
	case 2:		return __kmap_atomic_primary(0, paddr, 8);
	case 3:		return __kmap_atomic_primary(0, paddr, 9);
	case 4:		return __kmap_atomic_primary(0, paddr, 10);

	case 5 ... 5 + NR_TLB_LINES - 1:
		return __kmap_atomic_secondary(type - 5, paddr);

	default:
		BUG();
		return NULL;
	}
}
EXPORT_SYMBOL(kmap_atomic);

void __kunmap_atomic(void *kvaddr)
{
	int type = kmap_atomic_idx();
	switch (type) {
	case 0:		__kunmap_atomic_primary(0, 6);	break;
	case 1:		__kunmap_atomic_primary(0, 7);	break;
	case 2:		__kunmap_atomic_primary(0, 8);	break;
	case 3:		__kunmap_atomic_primary(0, 9);	break;
	case 4:		__kunmap_atomic_primary(0, 10);	break;

	case 5 ... 5 + NR_TLB_LINES - 1:
		__kunmap_atomic_secondary(type - 5, kvaddr);
		break;

	default:
		BUG();
	}
	kmap_atomic_idx_pop();
	pagefault_enable();
	preempt_enable();
}
EXPORT_SYMBOL(__kunmap_atomic);
Commit	Line	Data
1da177e4 LT	1	/* highmem.c: arch-specific highmem stuff
	2	*
	3	* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
	4	* Written by David Howells (dhowells@redhat.com)
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*/
	11	#include <linux/highmem.h>
40234401	12	#include <linux/module.h>
1da177e4 LT	13
	14	void kmap(struct page page)
	15	{
	16	might_sleep();
	17	if (!PageHighMem(page))
	18	return page_address(page);
	19	return kmap_high(page);
	20	}
	21
40234401 DH	22	EXPORT_SYMBOL(kmap);
40234401 DH	23
1da177e4 LT	24	void kunmap(struct page *page)
	25	{
	26	if (in_interrupt())
	27	BUG();
	28	if (!PageHighMem(page))
	29	return;
	30	kunmap_high(page);
	31	}
	32
40234401 DH	33	EXPORT_SYMBOL(kunmap);
40234401 DH	34
a24401bc	35	void kmap_atomic(struct page page)
3e4d3af5 PZ	36	{
	37	unsigned long paddr;
	38	int type;
	39
2cb7c9cb	40	preempt_disable();
3e4d3af5 PZ	41	pagefault_disable();
	42	type = kmap_atomic_idx_push();
	43	paddr = page_to_phys(page);
	44
	45	switch (type) {
	46	/*
	47	* The first 4 primary maps are reserved for architecture code
	48	*/
144cf864 CW	49	case 0: return __kmap_atomic_primary(0, paddr, 6);
	50	case 1: return __kmap_atomic_primary(0, paddr, 7);
	51	case 2: return __kmap_atomic_primary(0, paddr, 8);
	52	case 3: return __kmap_atomic_primary(0, paddr, 9);
	53	case 4: return __kmap_atomic_primary(0, paddr, 10);
3e4d3af5 PZ	54
	55	case 5 ... 5 + NR_TLB_LINES - 1:
	56	return __kmap_atomic_secondary(type - 5, paddr);
	57
	58	default:
	59	BUG();
	60	return NULL;
	61	}
	62	}
a24401bc	63	EXPORT_SYMBOL(kmap_atomic);
3e4d3af5 PZ	64
	65	void __kunmap_atomic(void *kvaddr)
	66	{
20273941	67	int type = kmap_atomic_idx();
3e4d3af5	68	switch (type) {
144cf864 CW	69	case 0: __kunmap_atomic_primary(0, 6); break;
	70	case 1: __kunmap_atomic_primary(0, 7); break;
	71	case 2: __kunmap_atomic_primary(0, 8); break;
	72	case 3: __kunmap_atomic_primary(0, 9); break;
	73	case 4: __kunmap_atomic_primary(0, 10); break;
3e4d3af5 PZ	74
	75	case 5 ... 5 + NR_TLB_LINES - 1:
	76	__kunmap_atomic_secondary(type - 5, kvaddr);
	77	break;
	78
	79	default:
	80	BUG();
	81	}
20273941	82	kmap_atomic_idx_pop();
3e4d3af5	83	pagefault_enable();
2cb7c9cb	84	preempt_enable();
3e4d3af5 PZ	85	}
3e4d3af5 PZ	86	EXPORT_SYMBOL(__kunmap_atomic);