/* * 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 #include #include #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 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 */