[deliverable/linux.git] / arch / s390 / mm / pgtable.c

/*
 *  arch/s390/mm/pgtable.c
 *
 *    Copyright IBM Corp. 2007
 *    Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
 */

#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/smp.h>
#include <linux/highmem.h>
#include <linux/slab.h>
#include <linux/pagemap.h>
#include <linux/spinlock.h>
#include <linux/module.h>
#include <linux/quicklist.h>

#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/tlb.h>
#include <asm/tlbflush.h>

#ifndef CONFIG_64BIT
#define ALLOC_ORDER	1
#else
#define ALLOC_ORDER	2
#endif

unsigned long *crst_table_alloc(struct mm_struct *mm, int noexec)
{
	struct page *page = alloc_pages(GFP_KERNEL, ALLOC_ORDER);

	if (!page)
		return NULL;
	page->index = 0;
	if (noexec) {
		struct page *shadow = alloc_pages(GFP_KERNEL, ALLOC_ORDER);
		if (!shadow) {
			__free_pages(page, ALLOC_ORDER);
			return NULL;
		}
		page->index = page_to_phys(shadow);
	}
	return (unsigned long *) page_to_phys(page);
}

void crst_table_free(unsigned long *table)
{
	unsigned long *shadow = get_shadow_table(table);

	if (shadow)
		free_pages((unsigned long) shadow, ALLOC_ORDER);
	free_pages((unsigned long) table, ALLOC_ORDER);
}

/*
 * page table entry allocation/free routines.
 */
unsigned long *page_table_alloc(int noexec)
{
	struct page *page = alloc_page(GFP_KERNEL);
	unsigned long *table;

	if (!page)
		return NULL;
	page->index = 0;
	if (noexec) {
		struct page *shadow = alloc_page(GFP_KERNEL);
		if (!shadow) {
			__free_page(page);
			return NULL;
		}
		table = (unsigned long *) page_to_phys(shadow);
		clear_table(table, _PAGE_TYPE_EMPTY, PAGE_SIZE);
		page->index = (addr_t) table;
	}
	table = (unsigned long *) page_to_phys(page);
	clear_table(table, _PAGE_TYPE_EMPTY, PAGE_SIZE);
	return table;
}

void page_table_free(unsigned long *table)
{
	unsigned long *shadow = get_shadow_pte(table);

	if (shadow)
		free_page((unsigned long) shadow);
	free_page((unsigned long) table);

}
Commit	Line	Data
3610cce8 MS	1	/*
	2	* arch/s390/mm/pgtable.c
	3	*
	4	* Copyright IBM Corp. 2007
	5	* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
	6	*/
	7
	8	#include <linux/sched.h>
	9	#include <linux/kernel.h>
	10	#include <linux/errno.h>
	11	#include <linux/mm.h>
	12	#include <linux/swap.h>
	13	#include <linux/smp.h>
	14	#include <linux/highmem.h>
	15	#include <linux/slab.h>
	16	#include <linux/pagemap.h>
	17	#include <linux/spinlock.h>
	18	#include <linux/module.h>
	19	#include <linux/quicklist.h>
	20
	21	#include <asm/system.h>
	22	#include <asm/pgtable.h>
	23	#include <asm/pgalloc.h>
	24	#include <asm/tlb.h>
	25	#include <asm/tlbflush.h>
	26
	27	#ifndef CONFIG_64BIT
	28	#define ALLOC_ORDER 1
	29	#else
	30	#define ALLOC_ORDER 2
	31	#endif
	32
	33	unsigned long crst_table_alloc(struct mm_struct mm, int noexec)
	34	{
	35	struct page *page = alloc_pages(GFP_KERNEL, ALLOC_ORDER);
	36
	37	if (!page)
	38	return NULL;
	39	page->index = 0;
	40	if (noexec) {
	41	struct page *shadow = alloc_pages(GFP_KERNEL, ALLOC_ORDER);
	42	if (!shadow) {
	43	__free_pages(page, ALLOC_ORDER);
	44	return NULL;
	45	}
	46	page->index = page_to_phys(shadow);
	47	}
	48	return (unsigned long *) page_to_phys(page);
	49	}
	50
	51	void crst_table_free(unsigned long *table)
	52	{
	53	unsigned long *shadow = get_shadow_table(table);
	54
	55	if (shadow)
	56	free_pages((unsigned long) shadow, ALLOC_ORDER);
	57	free_pages((unsigned long) table, ALLOC_ORDER);
	58	}
	59
	60	/*
	61	* page table entry allocation/free routines.
	62	*/
	63	unsigned long *page_table_alloc(int noexec)
	64	{
65	struct page *page = alloc_page(GFP_KERNEL);
66	unsigned long *table;
67
68	if (!page)
69	return NULL;
70	page->index = 0;
71	if (noexec) {
72	struct page *shadow = alloc_page(GFP_KERNEL);
73	if (!shadow) {
74	__free_page(page);
75	return NULL;
76	}
77	table = (unsigned long *) page_to_phys(shadow);
78	clear_table(table, _PAGE_TYPE_EMPTY, PAGE_SIZE);
79	page->index = (addr_t) table;
80	}
81	table = (unsigned long *) page_to_phys(page);
82	clear_table(table, _PAGE_TYPE_EMPTY, PAGE_SIZE);
83	return table;
84	}
85
86	void page_table_free(unsigned long *table)
87	{
88	unsigned long *shadow = get_shadow_pte(table);
89
90	if (shadow)
91	free_page((unsigned long) shadow);
92	free_page((unsigned long) table);
93
94	}