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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 pgd_quicklist (S390_lowcore.cpu_data.pgd_quick)
#define pmd_quicklist ((unsigned long *)0)
#define pte_quicklist (S390_lowcore.cpu_data.pte_quick)
#define pgtable_cache_size (S390_lowcore.cpu_data.pgtable_cache_sz)
/*
* Allocate and free page tables. The xxx_kernel() versions are
* used to allocate a kernel page table - this turns on ASN bits
* if any.
*/
extern __inline__ pgd_t* get_pgd_slow(void)
{
pgd_t *ret;
int i;
ret = (pgd_t *) __get_free_pages(GFP_KERNEL,1);
if (ret != NULL)
for (i = 0; i < USER_PTRS_PER_PGD; i++)
pmd_clear(pmd_offset(ret + i, i*PGDIR_SIZE));
return ret;
}
extern __inline__ pgd_t* get_pgd_fast(void)
{
unsigned long *ret = pgd_quicklist;
if (ret != NULL) {
pgd_quicklist = (unsigned long *)(*ret);
ret[0] = ret[1];
pgtable_cache_size -= 2;
}
return (pgd_t *)ret;
}
extern __inline__ pgd_t *pgd_alloc(struct mm_struct *mm)
{
pgd_t *pgd;
pgd = get_pgd_fast();
if (!pgd)
pgd = get_pgd_slow();
return pgd;
}
extern __inline__ void free_pgd_fast(pgd_t *pgd)
{
*(unsigned long *)pgd = (unsigned long) pgd_quicklist;
pgd_quicklist = (unsigned long *) pgd;
pgtable_cache_size += 2;
}
extern __inline__ void free_pgd_slow(pgd_t *pgd)
{
free_pages((unsigned long) pgd, 1);
}
#define pgd_free(pgd) free_pgd_fast(pgd)
/*
* 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_fast(mm, address) ({ BUG(); ((pmd_t *)1); })
#define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
#define pmd_free(x) do { } while (0)
#define pmd_free_slow(x) do { } while (0)
#define pmd_free_fast(x) do { } while (0)
#define pgd_populate(mm, pmd, pte) BUG()
extern inline void pmd_populate(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);
}
/*
* page table entry allocation/free routines.
*/
extern inline pte_t * pte_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
{
pte_t *pte;
int i;
pte = (pte_t *) __get_free_page(GFP_KERNEL);
if (pte != NULL) {
for (i=0; i < PTRS_PER_PTE; i++)
pte_clear(pte+i);
}
return pte;
}
extern __inline__ pte_t *
pte_alloc_one_fast(struct mm_struct *mm, unsigned long address)
{
unsigned long *ret = (unsigned long *) pte_quicklist;
if (ret != NULL) {
pte_quicklist = (unsigned long *)(*ret);
ret[0] = ret[1];
pgtable_cache_size--;
}
return (pte_t *)ret;
}
extern __inline__ void pte_free_fast(pte_t *pte)
{
*(unsigned long *)pte = (unsigned long) pte_quicklist;
pte_quicklist = (unsigned long *) pte;
pgtable_cache_size++;
}
extern __inline__ void pte_free_slow(pte_t *pte)
{
free_page((unsigned long) pte);
}
#define pte_free(pte) pte_free_fast(pte)
extern int do_check_pgt_cache(int, int);
/*
* 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)
/*
* TLB flushing:
*
* - flush_tlb() flushes the current mm struct TLBs
* - flush_tlb_all() flushes all processes TLBs
* called only from vmalloc/vfree
* - flush_tlb_mm(mm) flushes the specified mm context TLB's
* - flush_tlb_page(vma, vmaddr) flushes one page
* - flush_tlb_range(mm, start, end) flushes a range of pages
* - flush_tlb_pgtables(mm, start, end) flushes a range of page tables
*/
/*
* S/390 has three ways of flushing TLBs
* 'ptlb' does a flush of the local processor
* 'csp' flushes the TLBs on all PUs of a SMP
* 'ipte' invalidates a pte in a page table and flushes that out of
* the TLBs of all PUs of a SMP
*/
#define local_flush_tlb() \
do { __asm__ __volatile__("ptlb": : :"memory"); } while (0)
#ifndef CONFIG_SMP
/*
* We always need to flush, since s390 does not flush tlb
* on each context switch
*/
static inline void flush_tlb(void)
{
local_flush_tlb();
}
static inline void flush_tlb_all(void)
{
local_flush_tlb();
}
static inline void flush_tlb_mm(struct mm_struct *mm)
{
local_flush_tlb();
}
static inline void flush_tlb_page(struct vm_area_struct *vma,
unsigned long addr)
{
local_flush_tlb();
}
static inline void flush_tlb_range(struct mm_struct *mm,
unsigned long start, unsigned long end)
{
local_flush_tlb();
}
#else
#include <asm/smp.h>
extern void smp_ptlb_all(void);
static inline void global_flush_tlb_csp(void)
{
int cs1=0,dum=0;
int *adr;
long long dummy=0;
adr = (int*) (((int)(((int*) &dummy)+1) & 0xfffffffc)|1);
__asm__ __volatile__("lr 2,%0\n\t"
"lr 3,%1\n\t"
"lr 4,%2\n\t"
"csp 2,4" :
: "d" (cs1), "d" (dum), "d" (adr)
: "2", "3", "4");
}
static inline void global_flush_tlb(void)
{
if (MACHINE_HAS_CSP)
global_flush_tlb_csp();
else
smp_ptlb_all();
}
/*
* We only have to do global flush of tlb if process run since last
* flush on any other pu than current.
* If we have threads (mm->count > 1) we always do a global flush,
* since the process runs on more than one processor at the same time.
*/
static inline void __flush_tlb_mm(struct mm_struct * mm)
{
if ((smp_num_cpus > 1) &&
((atomic_read(&mm->mm_count) != 1) ||
(mm->cpu_vm_mask != (1UL << smp_processor_id())))) {
mm->cpu_vm_mask = (1UL << smp_processor_id());
global_flush_tlb();
} else {
local_flush_tlb();
}
}
static inline void flush_tlb(void)
{
__flush_tlb_mm(current->mm);
}
static inline void flush_tlb_all(void)
{
global_flush_tlb();
}
static inline void flush_tlb_mm(struct mm_struct *mm)
{
__flush_tlb_mm(mm);
}
static inline void flush_tlb_page(struct vm_area_struct *vma,
unsigned long addr)
{
__flush_tlb_mm(vma->vm_mm);
}
static inline void flush_tlb_range(struct mm_struct *mm,
unsigned long start, unsigned long end)
{
__flush_tlb_mm(mm);
}
#endif
extern inline void flush_tlb_pgtables(struct mm_struct *mm,
unsigned long start, unsigned long end)
{
/* S/390 does not keep any page table caches in TLB */
}
static inline int ptep_test_and_clear_and_flush_young(struct vm_area_struct *vma,
unsigned long address, pte_t *ptep)
{
/* No need to flush TLB; bits are in storage key */
return ptep_test_and_clear_young(ptep);
}
static inline int ptep_test_and_clear_and_flush_dirty(struct vm_area_struct *vma,
unsigned long address, pte_t *ptep)
{
/* No need to flush TLB; bits are in storage key */
return ptep_test_and_clear_dirty(ptep);
}
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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