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132 lines
3.5 KiB
132 lines
3.5 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) |
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* |
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* vineetg: June 2011 |
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* -"/proc/meminfo | grep PageTables" kept on increasing |
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* Recently added pgtable dtor was not getting called. |
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* |
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* vineetg: May 2011 |
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* -Variable pg-sz means that Page Tables could be variable sized themselves |
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* So calculate it based on addr traversal split [pgd-bits:pte-bits:xxx] |
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* -Page Table size capped to max 1 to save memory - hence verified. |
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* -Since these deal with constants, gcc compile-time optimizes them. |
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* |
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* vineetg: Nov 2010 |
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* -Added pgtable ctor/dtor used for pgtable mem accounting |
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* |
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* vineetg: April 2010 |
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* -Switched pgtable_t from being struct page * to unsigned long |
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* =Needed so that Page Table allocator (pte_alloc_one) is not forced to |
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* deal with struct page. That way in future we can make it allocate |
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* multiple PG Tbls in one Page Frame |
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* =sweet side effect is avoiding calls to ugly page_address( ) from the |
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* pg-tlb allocator sub-sys (pte_alloc_one, ptr_free, pmd_populate) |
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* |
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* Amit Bhor, Sameer Dhavale: Codito Technologies 2004 |
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*/ |
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#ifndef _ASM_ARC_PGALLOC_H |
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#define _ASM_ARC_PGALLOC_H |
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#include <linux/mm.h> |
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#include <linux/log2.h> |
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static inline void |
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pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte) |
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{ |
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pmd_set(pmd, pte); |
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} |
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static inline void |
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pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t ptep) |
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{ |
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pmd_set(pmd, (pte_t *) ptep); |
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} |
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static inline int __get_order_pgd(void) |
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{ |
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return get_order(PTRS_PER_PGD * sizeof(pgd_t)); |
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} |
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static inline pgd_t *pgd_alloc(struct mm_struct *mm) |
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{ |
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int num, num2; |
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pgd_t *ret = (pgd_t *) __get_free_pages(GFP_KERNEL, __get_order_pgd()); |
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if (ret) { |
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num = USER_PTRS_PER_PGD + USER_KERNEL_GUTTER / PGDIR_SIZE; |
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memzero(ret, num * sizeof(pgd_t)); |
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num2 = VMALLOC_SIZE / PGDIR_SIZE; |
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memcpy(ret + num, swapper_pg_dir + num, num2 * sizeof(pgd_t)); |
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memzero(ret + num + num2, |
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(PTRS_PER_PGD - num - num2) * sizeof(pgd_t)); |
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} |
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return ret; |
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} |
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static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) |
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{ |
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free_pages((unsigned long)pgd, __get_order_pgd()); |
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} |
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/* |
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* With software-only page-tables, addr-split for traversal is tweakable and |
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* that directly governs how big tables would be at each level. |
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* Further, the MMU page size is configurable. |
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* Thus we need to programatically assert the size constraint |
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* All of this is const math, allowing gcc to do constant folding/propagation. |
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*/ |
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static inline int __get_order_pte(void) |
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{ |
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return get_order(PTRS_PER_PTE * sizeof(pte_t)); |
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} |
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static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm) |
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{ |
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pte_t *pte; |
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pte = (pte_t *) __get_free_pages(GFP_KERNEL | __GFP_ZERO, |
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__get_order_pte()); |
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return pte; |
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} |
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static inline pgtable_t |
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pte_alloc_one(struct mm_struct *mm) |
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{ |
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pgtable_t pte_pg; |
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struct page *page; |
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pte_pg = (pgtable_t)__get_free_pages(GFP_KERNEL, __get_order_pte()); |
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if (!pte_pg) |
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return 0; |
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memzero((void *)pte_pg, PTRS_PER_PTE * sizeof(pte_t)); |
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page = virt_to_page(pte_pg); |
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if (!pgtable_pte_page_ctor(page)) { |
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__free_page(page); |
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return 0; |
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} |
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return pte_pg; |
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} |
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static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) |
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{ |
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free_pages((unsigned long)pte, __get_order_pte()); /* takes phy addr */ |
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} |
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static inline void pte_free(struct mm_struct *mm, pgtable_t ptep) |
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{ |
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pgtable_pte_page_dtor(virt_to_page(ptep)); |
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free_pages((unsigned long)ptep, __get_order_pte()); |
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} |
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#define __pte_free_tlb(tlb, pte, addr) pte_free((tlb)->mm, pte) |
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#endif /* _ASM_ARC_PGALLOC_H */
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