/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) * * vineetg: June 2011 * -"/proc/meminfo | grep PageTables" kept on increasing * Recently added pgtable dtor was not getting called. * * vineetg: May 2011 * -Variable pg-sz means that Page Tables could be variable sized themselves * So calculate it based on addr traversal split [pgd-bits:pte-bits:xxx] * -Page Table size capped to max 1 to save memory - hence verified. * -Since these deal with constants, gcc compile-time optimizes them. * * vineetg: Nov 2010 * -Added pgtable ctor/dtor used for pgtable mem accounting * * vineetg: April 2010 * -Switched pgtable_t from being struct page * to unsigned long * =Needed so that Page Table allocator (pte_alloc_one) is not forced to * deal with struct page. That way in future we can make it allocate * multiple PG Tbls in one Page Frame * =sweet side effect is avoiding calls to ugly page_address( ) from the * pg-tlb allocator sub-sys (pte_alloc_one, ptr_free, pmd_populate) * * Amit Bhor, Sameer Dhavale: Codito Technologies 2004 */ #ifndef _ASM_ARC_PGALLOC_H #define _ASM_ARC_PGALLOC_H #include <linux/mm.h> #include <linux/log2.h> #include <asm-generic/pgalloc.h> static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte) { /* * The cast to long below is OK in 32-bit PAE40 regime with long long pte * Despite "wider" pte, the pte table needs to be in non-PAE low memory * as all higher levels can only hold long pointers. * * The cast itself is needed given simplistic definition of set_pmd() */ set_pmd(pmd, __pmd((unsigned long)pte)); } static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t pte_page) { set_pmd(pmd, __pmd((unsigned long)page_address(pte_page))); } static inline pgd_t *pgd_alloc(struct mm_struct *mm) { pgd_t *ret = (pgd_t *) __get_free_page(GFP_KERNEL); if (ret) { int num, num2; num = USER_PTRS_PER_PGD + USER_KERNEL_GUTTER / PGDIR_SIZE; memzero(ret, num * sizeof(pgd_t)); num2 = VMALLOC_SIZE / PGDIR_SIZE; memcpy(ret + num, swapper_pg_dir + num, num2 * sizeof(pgd_t)); memzero(ret + num + num2, (PTRS_PER_PGD - num - num2) * sizeof(pgd_t)); } return ret; } #if CONFIG_PGTABLE_LEVELS > 3 static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4dp, pud_t *pudp) { set_p4d(p4dp, __p4d((unsigned long)pudp)); } #define __pud_free_tlb(tlb, pmd, addr) pud_free((tlb)->mm, pmd) #endif #if CONFIG_PGTABLE_LEVELS > 2 static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp) { set_pud(pudp, __pud((unsigned long)pmdp)); } #define __pmd_free_tlb(tlb, pmd, addr) pmd_free((tlb)->mm, pmd) #endif #define __pte_free_tlb(tlb, pte, addr) pte_free((tlb)->mm, pte) #endif /* _ASM_ARC_PGALLOC_H */