/* * include/asm-s390/pgalloc.h * * S390 version * Copyright (C) 1999, 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation * Author(s): Hartmut Penner (hpenner@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 (S390_lowcore.cpu_data.pmd_quick) #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. */ /* * page directory allocation/free routines. */ extern __inline__ pgd_t *get_pgd_slow (void) { int i; pgd_t *ret = (pgd_t *)__get_free_pages(GFP_KERNEL,2); if (ret) for (i = 0; i < PTRS_PER_PGD; i++) pgd_clear(ret + i); 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 -= 4; } return (pgd_t *) ret; } extern __inline__ pgd_t *pgd_alloc (void) { 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 += 4; } extern __inline__ void free_pgd_slow (pgd_t *pgd) { free_pages((unsigned long) pgd, 2); } #define pgd_free(pgd) free_pgd_fast(pgd) /* * page middle directory allocation/free routines. */ extern pmd_t empty_bad_pmd_table[]; extern pmd_t *get_pmd_slow(pgd_t *pgd, unsigned long address); extern __inline__ pmd_t *get_pmd_fast (void) { unsigned long *ret = (unsigned long *) pmd_quicklist; if (ret != NULL) { pmd_quicklist = (unsigned long *)(*ret); ret[0] = ret[1]; pgtable_cache_size -= 4; } return (pmd_t *) ret; } extern __inline__ void free_pmd_fast (pmd_t *pmd) { if (pmd == empty_bad_pmd_table) return; *(unsigned long *) pmd = (unsigned long) pmd_quicklist; pmd_quicklist = (unsigned long *) pmd; pgtable_cache_size += 4; } extern __inline__ void free_pmd_slow (pmd_t *pmd) { free_pages((unsigned long) pmd, 2); } extern __inline__ pmd_t *pmd_alloc (pgd_t *pgd, unsigned long vmaddr) { unsigned long offset; offset = (vmaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1); if (pgd_none(*pgd)) { pmd_t *pmd_page = get_pmd_fast(); if (!pmd_page) return get_pmd_slow(pgd, offset); pgd_set(pgd, pmd_page); return pmd_page + offset; } if (pgd_bad(*pgd)) BUG(); return (pmd_t *) pgd_page(*pgd) + offset; } #define pmd_alloc_kernel(pgd, addr) pmd_alloc(pgd, addr) #define pmd_free_kernel(pmd) free_pmd_fast(pmd) #define pmd_free(pmd) free_pmd_fast(pmd) /* * page table entry allocation/free routines. */ extern pte_t empty_bad_pte_table[]; extern pte_t *get_pte_slow (pmd_t *pmd, unsigned long address_preadjusted); extern __inline__ pte_t *get_pte_fast (void) { 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 free_pte_fast (pte_t *pte) { if (pte == empty_bad_pte_table) return; *(unsigned long *) pte = (unsigned long) pte_quicklist; pte_quicklist = (unsigned long *) pte; pgtable_cache_size++; } extern __inline__ void free_pte_slow (pte_t *pte) { free_page((unsigned long) pte); } extern __inline__ pte_t *pte_alloc (pmd_t *pmd, unsigned long vmaddr) { unsigned long offset; offset = (vmaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1); if (pmd_none(*pmd)) { pte_t *pte_page = get_pte_fast(); if (!pte_page) return get_pte_slow(pmd, offset); pmd_set(pmd, pte_page); return pte_page + offset; } if (pmd_bad(*pmd)) BUG(); return (pte_t *) pmd_page(*pmd) + offset; } #define pte_alloc_kernel(pmd, addr) pte_alloc(pmd, addr) #define pte_free_kernel(pte) free_pte_fast(pte) #define pte_free(pte) free_pte_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(vmaddr, 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 */ #define flush_tlb() local_flush_tlb() #define flush_tlb_all() local_flush_tlb() #define flush_tlb_mm(mm) local_flush_tlb() #define flush_tlb_page(vma, va) local_flush_tlb() #define flush_tlb_range(mm, start, end) local_flush_tlb() #else #include static inline void global_flush_tlb(void) { long dummy = 0; __asm__ __volatile__ ( " la 4,3(%0)\n" " nill 4,0xfffc\n" " la 4,1(4)\n" " slr 2,2\n" " slr 3,3\n" " csp 2,4" : : "a" (&dummy) : "2", "3", "4" ); } /* * 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(); } } #define flush_tlb() __flush_tlb_mm(current->mm) #define flush_tlb_all() global_flush_tlb() #define flush_tlb_mm(mm) __flush_tlb_mm(mm) #define flush_tlb_page(vma, va) __flush_tlb_mm((vma)->vm_mm) #define flush_tlb_range(mm, start, 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)) __asm__ __volatile__ ("ipte %0,%1" : : "a" (ptep), "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 */