95 lines
2.0 KiB
C
95 lines
2.0 KiB
C
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/*
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* arch/s390/mm/pgtable.c
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*
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* Copyright IBM Corp. 2007
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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
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*/
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/smp.h>
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#include <linux/highmem.h>
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#include <linux/slab.h>
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#include <linux/pagemap.h>
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#include <linux/spinlock.h>
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#include <linux/module.h>
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#include <linux/quicklist.h>
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#include <asm/system.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/tlb.h>
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#include <asm/tlbflush.h>
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#ifndef CONFIG_64BIT
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#define ALLOC_ORDER 1
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#else
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#define ALLOC_ORDER 2
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#endif
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unsigned long *crst_table_alloc(struct mm_struct *mm, int noexec)
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{
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struct page *page = alloc_pages(GFP_KERNEL, ALLOC_ORDER);
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if (!page)
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return NULL;
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page->index = 0;
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if (noexec) {
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struct page *shadow = alloc_pages(GFP_KERNEL, ALLOC_ORDER);
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if (!shadow) {
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__free_pages(page, ALLOC_ORDER);
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return NULL;
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}
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page->index = page_to_phys(shadow);
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}
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return (unsigned long *) page_to_phys(page);
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}
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void crst_table_free(unsigned long *table)
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{
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unsigned long *shadow = get_shadow_table(table);
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if (shadow)
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free_pages((unsigned long) shadow, ALLOC_ORDER);
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free_pages((unsigned long) table, ALLOC_ORDER);
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}
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/*
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* page table entry allocation/free routines.
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*/
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unsigned long *page_table_alloc(int noexec)
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{
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struct page *page = alloc_page(GFP_KERNEL);
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unsigned long *table;
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if (!page)
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return NULL;
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page->index = 0;
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if (noexec) {
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struct page *shadow = alloc_page(GFP_KERNEL);
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if (!shadow) {
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__free_page(page);
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return NULL;
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}
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table = (unsigned long *) page_to_phys(shadow);
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clear_table(table, _PAGE_TYPE_EMPTY, PAGE_SIZE);
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page->index = (addr_t) table;
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}
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table = (unsigned long *) page_to_phys(page);
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clear_table(table, _PAGE_TYPE_EMPTY, PAGE_SIZE);
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return table;
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}
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void page_table_free(unsigned long *table)
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{
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unsigned long *shadow = get_shadow_pte(table);
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if (shadow)
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free_page((unsigned long) shadow);
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free_page((unsigned long) table);
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}
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