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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/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)

extern void diag10(unsigned long addr);

/*

 * 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 (mm->cpu_vm_mask != (1UL << smp_processor_id())) {

                /* mm was active on more than one cpu. */

                if (mm == current->active_mm &&

                    atomic_read(&mm->mm_users) == 1)

                        /* this cpu is the only one using the mm. */

                        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 */