240 lines
5.7 KiB
C
240 lines
5.7 KiB
C
/*
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* include/asm-s390/pgalloc.h
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*
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* S390 version
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* Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Hartmut Penner (hp@de.ibm.com)
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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*
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* Derived from "include/asm-i386/pgalloc.h"
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* Copyright (C) 1994 Linus Torvalds
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*/
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#ifndef _S390_PGALLOC_H
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#define _S390_PGALLOC_H
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#include <linux/threads.h>
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#include <linux/gfp.h>
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#include <linux/mm.h>
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#define check_pgt_cache() do {} while (0)
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extern void diag10(unsigned long addr);
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/*
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* Page allocation orders.
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*/
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#ifndef __s390x__
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# define PTE_ALLOC_ORDER 0
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# define PMD_ALLOC_ORDER 0
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# define PGD_ALLOC_ORDER 1
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#else /* __s390x__ */
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# define PTE_ALLOC_ORDER 0
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# define PMD_ALLOC_ORDER 2
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# define PGD_ALLOC_ORDER 2
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#endif /* __s390x__ */
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/*
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* Allocate and free page tables. The xxx_kernel() versions are
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* used to allocate a kernel page table - this turns on ASN bits
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* if any.
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*/
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static inline pgd_t *pgd_alloc(struct mm_struct *mm)
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{
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pgd_t *pgd = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ALLOC_ORDER);
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int i;
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if (!pgd)
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return NULL;
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if (s390_noexec) {
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pgd_t *shadow_pgd = (pgd_t *)
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__get_free_pages(GFP_KERNEL, PGD_ALLOC_ORDER);
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struct page *page = virt_to_page(pgd);
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if (!shadow_pgd) {
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free_pages((unsigned long) pgd, PGD_ALLOC_ORDER);
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return NULL;
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}
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page->lru.next = (void *) shadow_pgd;
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}
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for (i = 0; i < PTRS_PER_PGD; i++)
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#ifndef __s390x__
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pmd_clear(pmd_offset(pgd + i, i*PGDIR_SIZE));
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#else
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pgd_clear(pgd + i);
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#endif
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return pgd;
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}
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static inline void pgd_free(pgd_t *pgd)
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{
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pgd_t *shadow_pgd = get_shadow_pgd(pgd);
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if (shadow_pgd)
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free_pages((unsigned long) shadow_pgd, PGD_ALLOC_ORDER);
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free_pages((unsigned long) pgd, PGD_ALLOC_ORDER);
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}
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#ifndef __s390x__
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/*
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* page middle directory allocation/free routines.
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* We use pmd cache only on s390x, so these are dummy routines. This
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* code never triggers because the pgd will always be present.
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*/
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#define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
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#define pmd_free(x) do { } while (0)
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#define __pmd_free_tlb(tlb,x) do { } while (0)
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#define pgd_populate(mm, pmd, pte) BUG()
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#define pgd_populate_kernel(mm, pmd, pte) BUG()
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#else /* __s390x__ */
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static inline pmd_t * pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
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{
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pmd_t *pmd = (pmd_t *) __get_free_pages(GFP_KERNEL, PMD_ALLOC_ORDER);
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int i;
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if (!pmd)
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return NULL;
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if (s390_noexec) {
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pmd_t *shadow_pmd = (pmd_t *)
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__get_free_pages(GFP_KERNEL, PMD_ALLOC_ORDER);
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struct page *page = virt_to_page(pmd);
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if (!shadow_pmd) {
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free_pages((unsigned long) pmd, PMD_ALLOC_ORDER);
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return NULL;
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}
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page->lru.next = (void *) shadow_pmd;
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}
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for (i=0; i < PTRS_PER_PMD; i++)
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pmd_clear(pmd + i);
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return pmd;
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}
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static inline void pmd_free (pmd_t *pmd)
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{
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pmd_t *shadow_pmd = get_shadow_pmd(pmd);
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if (shadow_pmd)
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free_pages((unsigned long) shadow_pmd, PMD_ALLOC_ORDER);
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free_pages((unsigned long) pmd, PMD_ALLOC_ORDER);
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}
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#define __pmd_free_tlb(tlb,pmd) \
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do { \
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tlb_flush_mmu(tlb, 0, 0); \
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pmd_free(pmd); \
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} while (0)
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static inline void
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pgd_populate_kernel(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
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{
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pgd_val(*pgd) = _PGD_ENTRY | __pa(pmd);
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}
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static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
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{
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pgd_t *shadow_pgd = get_shadow_pgd(pgd);
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pmd_t *shadow_pmd = get_shadow_pmd(pmd);
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if (shadow_pgd && shadow_pmd)
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pgd_populate_kernel(mm, shadow_pgd, shadow_pmd);
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pgd_populate_kernel(mm, pgd, pmd);
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}
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#endif /* __s390x__ */
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static inline void
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pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
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{
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#ifndef __s390x__
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pmd_val(pmd[0]) = _PAGE_TABLE + __pa(pte);
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pmd_val(pmd[1]) = _PAGE_TABLE + __pa(pte+256);
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pmd_val(pmd[2]) = _PAGE_TABLE + __pa(pte+512);
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pmd_val(pmd[3]) = _PAGE_TABLE + __pa(pte+768);
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#else /* __s390x__ */
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pmd_val(*pmd) = _PMD_ENTRY + __pa(pte);
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pmd_val1(*pmd) = _PMD_ENTRY + __pa(pte+256);
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#endif /* __s390x__ */
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}
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static inline void
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pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *page)
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{
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pte_t *pte = (pte_t *)page_to_phys(page);
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pmd_t *shadow_pmd = get_shadow_pmd(pmd);
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pte_t *shadow_pte = get_shadow_pte(pte);
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pmd_populate_kernel(mm, pmd, pte);
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if (shadow_pmd && shadow_pte)
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pmd_populate_kernel(mm, shadow_pmd, shadow_pte);
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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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static inline pte_t *
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pte_alloc_one_kernel(struct mm_struct *mm, unsigned long vmaddr)
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{
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pte_t *pte = (pte_t *) __get_free_page(GFP_KERNEL|__GFP_REPEAT);
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int i;
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if (!pte)
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return NULL;
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if (s390_noexec) {
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pte_t *shadow_pte = (pte_t *)
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__get_free_page(GFP_KERNEL|__GFP_REPEAT);
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struct page *page = virt_to_page(pte);
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if (!shadow_pte) {
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free_page((unsigned long) pte);
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return NULL;
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}
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page->lru.next = (void *) shadow_pte;
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}
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for (i=0; i < PTRS_PER_PTE; i++) {
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pte_clear(mm, vmaddr, pte + i);
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vmaddr += PAGE_SIZE;
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}
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return pte;
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}
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static inline struct page *
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pte_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
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{
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pte_t *pte = pte_alloc_one_kernel(mm, vmaddr);
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if (pte)
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return virt_to_page(pte);
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return NULL;
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}
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static inline void pte_free_kernel(pte_t *pte)
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{
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pte_t *shadow_pte = get_shadow_pte(pte);
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if (shadow_pte)
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free_page((unsigned long) shadow_pte);
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free_page((unsigned long) pte);
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}
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static inline void pte_free(struct page *pte)
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{
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struct page *shadow_page = get_shadow_page(pte);
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if (shadow_page)
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__free_page(shadow_page);
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__free_page(pte);
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}
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#define __pte_free_tlb(tlb, pte) \
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({ \
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struct mmu_gather *__tlb = (tlb); \
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struct page *__pte = (pte); \
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struct page *shadow_page = get_shadow_page(__pte); \
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if (shadow_page) \
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tlb_remove_page(__tlb, shadow_page); \
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tlb_remove_page(__tlb, __pte); \
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})
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#endif /* _S390_PGALLOC_H */
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