mirror of https://gitee.com/openkylin/linux.git
145 lines
3.8 KiB
C
145 lines
3.8 KiB
C
/*
|
|
* S390 version
|
|
* Copyright IBM Corp. 1999, 2000
|
|
* 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>
|
|
|
|
unsigned long *crst_table_alloc(struct mm_struct *);
|
|
void crst_table_free(struct mm_struct *, unsigned long *);
|
|
|
|
unsigned long *page_table_alloc(struct mm_struct *);
|
|
struct page *page_table_alloc_pgste(struct mm_struct *mm);
|
|
void page_table_free(struct mm_struct *, unsigned long *);
|
|
void page_table_free_rcu(struct mmu_gather *, unsigned long *, unsigned long);
|
|
void page_table_free_pgste(struct page *page);
|
|
extern int page_table_allocate_pgste;
|
|
|
|
static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
|
|
{
|
|
struct addrtype { char _[256]; };
|
|
int i;
|
|
|
|
for (i = 0; i < n; i += 256) {
|
|
*s = val;
|
|
asm volatile(
|
|
"mvc 8(248,%[s]),0(%[s])\n"
|
|
: "+m" (*(struct addrtype *) s)
|
|
: [s] "a" (s));
|
|
s += 256 / sizeof(long);
|
|
}
|
|
}
|
|
|
|
static inline void crst_table_init(unsigned long *crst, unsigned long entry)
|
|
{
|
|
clear_table(crst, entry, sizeof(unsigned long)*2048);
|
|
}
|
|
|
|
static inline unsigned long pgd_entry_type(struct mm_struct *mm)
|
|
{
|
|
if (mm->context.asce_limit <= (1UL << 31))
|
|
return _SEGMENT_ENTRY_EMPTY;
|
|
if (mm->context.asce_limit <= (1UL << 42))
|
|
return _REGION3_ENTRY_EMPTY;
|
|
return _REGION2_ENTRY_EMPTY;
|
|
}
|
|
|
|
int crst_table_upgrade(struct mm_struct *);
|
|
void crst_table_downgrade(struct mm_struct *);
|
|
|
|
static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
|
|
{
|
|
unsigned long *table = crst_table_alloc(mm);
|
|
if (table)
|
|
crst_table_init(table, _REGION3_ENTRY_EMPTY);
|
|
return (pud_t *) table;
|
|
}
|
|
#define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud)
|
|
|
|
static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
|
|
{
|
|
unsigned long *table = crst_table_alloc(mm);
|
|
|
|
if (!table)
|
|
return NULL;
|
|
crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
|
|
if (!pgtable_pmd_page_ctor(virt_to_page(table))) {
|
|
crst_table_free(mm, table);
|
|
return NULL;
|
|
}
|
|
return (pmd_t *) table;
|
|
}
|
|
|
|
static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
|
|
{
|
|
pgtable_pmd_page_dtor(virt_to_page(pmd));
|
|
crst_table_free(mm, (unsigned long *) pmd);
|
|
}
|
|
|
|
static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
|
|
{
|
|
pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud);
|
|
}
|
|
|
|
static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
|
|
{
|
|
pud_val(*pud) = _REGION3_ENTRY | __pa(pmd);
|
|
}
|
|
|
|
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
|
|
{
|
|
unsigned long *table = crst_table_alloc(mm);
|
|
|
|
if (!table)
|
|
return NULL;
|
|
if (mm->context.asce_limit == (1UL << 31)) {
|
|
/* Forking a compat process with 2 page table levels */
|
|
if (!pgtable_pmd_page_ctor(virt_to_page(table))) {
|
|
crst_table_free(mm, table);
|
|
return NULL;
|
|
}
|
|
}
|
|
return (pgd_t *) table;
|
|
}
|
|
|
|
static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
|
|
{
|
|
if (mm->context.asce_limit == (1UL << 31))
|
|
pgtable_pmd_page_dtor(virt_to_page(pgd));
|
|
crst_table_free(mm, (unsigned long *) pgd);
|
|
}
|
|
|
|
static inline void pmd_populate(struct mm_struct *mm,
|
|
pmd_t *pmd, pgtable_t pte)
|
|
{
|
|
pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
|
|
}
|
|
|
|
#define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte)
|
|
|
|
#define pmd_pgtable(pmd) \
|
|
(pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)
|
|
|
|
/*
|
|
* page table entry allocation/free routines.
|
|
*/
|
|
#define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
|
|
#define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
|
|
|
|
#define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
|
|
#define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
|
|
|
|
extern void rcu_table_freelist_finish(void);
|
|
|
|
#endif /* _S390_PGALLOC_H */
|