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/*
* include/asm-s390/pgalloc.h
*
* S390 version
* Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Author(s): Hartmut Penner (hp@de.ibm.com)
* Martin Schwidefsky (schwidefsky@de.ibm.com)
*
* Derived from "include/asm-i386/pgalloc.h"
* Copyright (C) 1994 Linus Torvalds
*/
#ifndef _S390_PGALLOC_H
#define _S390_PGALLOC_H
#include <linux/threads.h>
#include <linux/gfp.h>
#include <linux/mm.h>
#define check_pgt_cache() do {} while (0)
/*
* Page allocation orders.
*/
#ifndef __s390x__
# define PTE_ALLOC_ORDER 0
# define PMD_ALLOC_ORDER 0
# define PGD_ALLOC_ORDER 1
#else /* __s390x__ */
# define PTE_ALLOC_ORDER 0
# define PMD_ALLOC_ORDER 2
# define PGD_ALLOC_ORDER 2
#endif /* __s390x__ */
/*
* Allocate and free page tables. The xxx_kernel() versions are
* used to allocate a kernel page table - this turns on ASN bits
* if any.
*/
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
pgd_t *pgd = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ALLOC_ORDER);
int i;
if (!pgd)
return NULL;
if (s390_noexec) {
pgd_t *shadow_pgd = (pgd_t *)
__get_free_pages(GFP_KERNEL, PGD_ALLOC_ORDER);
struct page *page = virt_to_page(pgd);
if (!shadow_pgd) {
free_pages((unsigned long) pgd, PGD_ALLOC_ORDER);
return NULL;
}
page->lru.next = (void *) shadow_pgd;
}
for (i = 0; i < PTRS_PER_PGD; i++)
#ifndef __s390x__
pmd_clear(pmd_offset(pgd + i, i*PGDIR_SIZE));
#else
pgd_clear(pgd + i);
#endif
return pgd;
}
static inline void pgd_free(pgd_t *pgd)
{
pgd_t *shadow_pgd = get_shadow_pgd(pgd);
if (shadow_pgd)
free_pages((unsigned long) shadow_pgd, PGD_ALLOC_ORDER);
free_pages((unsigned long) pgd, PGD_ALLOC_ORDER);
}
#ifndef __s390x__
/*
* page middle directory allocation/free routines.
* We use pmd cache only on s390x, so these are dummy routines. This
* code never triggers because the pgd will always be present.
*/
#define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
#define pmd_free(x) do { } while (0)
#define pgd_populate(mm, pmd, pte) BUG()
#define pgd_populate_kernel(mm, pmd, pte) BUG()
#else /* __s390x__ */
static inline pmd_t * pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
{
pmd_t *pmd = (pmd_t *) __get_free_pages(GFP_KERNEL, PMD_ALLOC_ORDER);
int i;
if (!pmd)
return NULL;
if (s390_noexec) {
pmd_t *shadow_pmd = (pmd_t *)
__get_free_pages(GFP_KERNEL, PMD_ALLOC_ORDER);
struct page *page = virt_to_page(pmd);
if (!shadow_pmd) {
free_pages((unsigned long) pmd, PMD_ALLOC_ORDER);
return NULL;
}
page->lru.next = (void *) shadow_pmd;
}
for (i=0; i < PTRS_PER_PMD; i++)
pmd_clear(pmd + i);
return pmd;
}
static inline void pmd_free (pmd_t *pmd)
{
pmd_t *shadow_pmd = get_shadow_pmd(pmd);
if (shadow_pmd)
free_pages((unsigned long) shadow_pmd, PMD_ALLOC_ORDER);
free_pages((unsigned long) pmd, PMD_ALLOC_ORDER);
}
static inline void
pgd_populate_kernel(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
{
pgd_val(*pgd) = _PGD_ENTRY | __pa(pmd);
}
static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
{
pgd_t *shadow_pgd = get_shadow_pgd(pgd);
pmd_t *shadow_pmd = get_shadow_pmd(pmd);
if (shadow_pgd && shadow_pmd)
pgd_populate_kernel(mm, shadow_pgd, shadow_pmd);
pgd_populate_kernel(mm, pgd, pmd);
}
#endif /* __s390x__ */
static inline void
pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
{
#ifndef __s390x__
pmd_val(pmd[0]) = _PAGE_TABLE + __pa(pte);
pmd_val(pmd[1]) = _PAGE_TABLE + __pa(pte+256);
pmd_val(pmd[2]) = _PAGE_TABLE + __pa(pte+512);
pmd_val(pmd[3]) = _PAGE_TABLE + __pa(pte+768);
#else /* __s390x__ */
pmd_val(*pmd) = _PMD_ENTRY + __pa(pte);
pmd_val1(*pmd) = _PMD_ENTRY + __pa(pte+256);
#endif /* __s390x__ */
}
static inline void
pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *page)
{
pte_t *pte = (pte_t *)page_to_phys(page);
pmd_t *shadow_pmd = get_shadow_pmd(pmd);
pte_t *shadow_pte = get_shadow_pte(pte);
pmd_populate_kernel(mm, pmd, pte);
if (shadow_pmd && shadow_pte)
pmd_populate_kernel(mm, shadow_pmd, shadow_pte);
}
/*
* page table entry allocation/free routines.
*/
static inline pte_t *
pte_alloc_one_kernel(struct mm_struct *mm, unsigned long vmaddr)
{
pte_t *pte = (pte_t *) __get_free_page(GFP_KERNEL|__GFP_REPEAT);
int i;
if (!pte)
return NULL;
if (s390_noexec) {
pte_t *shadow_pte = (pte_t *)
__get_free_page(GFP_KERNEL|__GFP_REPEAT);
struct page *page = virt_to_page(pte);
if (!shadow_pte) {
free_page((unsigned long) pte);
return NULL;
}
page->lru.next = (void *) shadow_pte;
}
for (i=0; i < PTRS_PER_PTE; i++) {
pte_clear(mm, vmaddr, pte + i);
vmaddr += PAGE_SIZE;
}
return pte;
}
static inline struct page *
pte_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
{
pte_t *pte = pte_alloc_one_kernel(mm, vmaddr);
if (pte)
return virt_to_page(pte);
return NULL;
}
static inline void pte_free_kernel(pte_t *pte)
{
pte_t *shadow_pte = get_shadow_pte(pte);
if (shadow_pte)
free_page((unsigned long) shadow_pte);
free_page((unsigned long) pte);
}
static inline void pte_free(struct page *pte)
{
struct page *shadow_page = get_shadow_page(pte);
if (shadow_page)
__free_page(shadow_page);
__free_page(pte);
}
#endif /* _S390_PGALLOC_H */
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