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/*
* include/asm-s390/bugs.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/config.h>
#include <asm/processor.h>
#include <linux/threads.h>
#define check_pgt_cache() do {} while (0)
/*
* 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;
int i;
pgd = (pgd_t *) __get_free_pages(GFP_KERNEL,1);
if (pgd != NULL)
for (i = 0; i < USER_PTRS_PER_PGD; i++)
pmd_clear(pmd_offset(pgd + i, i*PGDIR_SIZE));
return pgd;
}
static inline void pgd_free(pgd_t *pgd)
{
free_pages((unsigned long) pgd, 1);
}
/*
* page middle directory allocation/free routines.
* We don't use pmd cache, 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 pmd_free_tlb(tlb,x) do { } while (0)
#define pgd_populate(mm, pmd, pte) BUG()
static inline void
pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
{
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);
}
static inline void
pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *page)
{
pmd_populate_kernel(mm, pmd, (pte_t *)((page-mem_map) << PAGE_SHIFT));
}
/*
* page table entry allocation/free routines.
*/
static inline pte_t *
pte_alloc_one_kernel(struct mm_struct *mm, unsigned long vmaddr)
{
pte_t *pte;
int count;
int i;
count = 0;
do {
pte = (pte_t *) __get_free_page(GFP_KERNEL);
if (pte != NULL) {
for (i=0; i < PTRS_PER_PTE; i++)
pte_clear(pte+i);
} else {
current->state = TASK_UNINTERRUPTIBLE;
schedule_timeout(HZ);
}
} while (!pte && (count++ < 10));
return pte;
}
static inline struct page *
pte_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
{
return virt_to_page(pte_alloc_one_kernel(mm, vmaddr));
}
static inline void pte_free_kernel(pte_t *pte)
{
free_page((unsigned long) pte);
}
static inline void pte_free(struct page *pte)
{
__free_page(pte);
}
#define pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
/*
* This establishes kernel virtual mappings (e.g., as a result of a
* vmalloc call). Since s390-esame uses a separate kernel page table,
* there is nothing to do here... :)
*/
#define set_pgdir(addr,entry) do { } while(0)
static inline pte_t ptep_invalidate(struct vm_area_struct *vma,
unsigned long address, pte_t *ptep)
{
pte_t pte = *ptep;
if (!(pte_val(pte) & _PAGE_INVALID)) {
/* S390 has 1mb segments, we are emulating 4MB segments */
pte_t *pto = (pte_t *) (((unsigned long) ptep) & 0x7ffffc00);
__asm__ __volatile__ ("ipte %0,%1" : : "a" (pto), "a" (address));
}
pte_clear(ptep);
return pte;
}
static inline void ptep_establish(struct vm_area_struct *vma,
unsigned long address, pte_t *ptep, pte_t entry)
{
ptep_invalidate(vma, address, ptep);
set_pte(ptep, entry);
}
#endif /* _S390_PGALLOC_H */
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