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/*
* 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);
}
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