From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/openrisc/include/asm/pgalloc.h | 75 +++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 arch/openrisc/include/asm/pgalloc.h (limited to 'arch/openrisc/include/asm/pgalloc.h') diff --git a/arch/openrisc/include/asm/pgalloc.h b/arch/openrisc/include/asm/pgalloc.h new file mode 100644 index 000000000..b7b2b8d16 --- /dev/null +++ b/arch/openrisc/include/asm/pgalloc.h @@ -0,0 +1,75 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * OpenRISC Linux + * + * Linux architectural port borrowing liberally from similar works of + * others. All original copyrights apply as per the original source + * declaration. + * + * OpenRISC implementation: + * Copyright (C) 2003 Matjaz Breskvar + * Copyright (C) 2010-2011 Jonas Bonn + * et al. + */ + +#ifndef __ASM_OPENRISC_PGALLOC_H +#define __ASM_OPENRISC_PGALLOC_H + +#include +#include +#include +#include + +#define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL +#include + +extern int mem_init_done; + +#define pmd_populate_kernel(mm, pmd, pte) \ + set_pmd(pmd, __pmd(_KERNPG_TABLE + __pa(pte))) + +static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, + struct page *pte) +{ + set_pmd(pmd, __pmd(_KERNPG_TABLE + + ((unsigned long)page_to_pfn(pte) << + (unsigned long) PAGE_SHIFT))); +} + +/* + * Allocate and free page tables. + */ +static inline pgd_t *pgd_alloc(struct mm_struct *mm) +{ + pgd_t *ret = (pgd_t *)__get_free_page(GFP_KERNEL); + + if (ret) { + memset(ret, 0, USER_PTRS_PER_PGD * sizeof(pgd_t)); + memcpy(ret + USER_PTRS_PER_PGD, + swapper_pg_dir + USER_PTRS_PER_PGD, + (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); + + } + return ret; +} + +#if 0 +/* FIXME: This seems to be the preferred style, but we are using + * current_pgd (from mm->pgd) to load kernel pages so we need it + * initialized. This needs to be looked into. + */ +extern inline pgd_t *pgd_alloc(struct mm_struct *mm) +{ + return (pgd_t *)get_zeroed_page(GFP_KERNEL); +} +#endif + +extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm); + +#define __pte_free_tlb(tlb, pte, addr) \ +do { \ + pgtable_pte_page_dtor(pte); \ + tlb_remove_page((tlb), (pte)); \ +} while (0) + +#endif -- cgit v1.2.3