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97 lines
2.8 KiB
97 lines
2.8 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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#include <asm-generic/pgalloc.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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/* |
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* The cast to long below is OK in 32-bit PAE40 regime with long long pte |
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* Despite "wider" pte, the pte table needs to be in non-PAE low memory |
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* as all higher levels can only hold long pointers. |
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* |
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* The cast itself is needed given simplistic definition of set_pmd() |
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*/ |
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set_pmd(pmd, __pmd((unsigned long)pte)); |
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} |
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static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t pte_page) |
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{ |
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set_pmd(pmd, __pmd((unsigned long)page_address(pte_page))); |
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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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pgd_t *ret = (pgd_t *) __get_free_page(GFP_KERNEL); |
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if (ret) { |
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int num, num2; |
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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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#if CONFIG_PGTABLE_LEVELS > 3 |
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static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4dp, pud_t *pudp) |
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{ |
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set_p4d(p4dp, __p4d((unsigned long)pudp)); |
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} |
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#define __pud_free_tlb(tlb, pmd, addr) pud_free((tlb)->mm, pmd) |
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#endif |
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#if CONFIG_PGTABLE_LEVELS > 2 |
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static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp) |
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{ |
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set_pud(pudp, __pud((unsigned long)pmdp)); |
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} |
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#define __pmd_free_tlb(tlb, pmd, addr) pmd_free((tlb)->mm, pmd) |
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#endif |
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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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