From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/arch/unicore32/mm/pgd.c | 105 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 105 insertions(+) create mode 100644 kernel/arch/unicore32/mm/pgd.c (limited to 'kernel/arch/unicore32/mm/pgd.c') diff --git a/kernel/arch/unicore32/mm/pgd.c b/kernel/arch/unicore32/mm/pgd.c new file mode 100644 index 000000000..2ade20d8e --- /dev/null +++ b/kernel/arch/unicore32/mm/pgd.c @@ -0,0 +1,105 @@ +/* + * linux/arch/unicore32/mm/pgd.c + * + * Code specific to PKUnity SoC and UniCore ISA + * + * Copyright (C) 2001-2010 GUAN Xue-tao + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include +#include +#include + +#include +#include +#include + +#include "mm.h" + +#define FIRST_KERNEL_PGD_NR (FIRST_USER_PGD_NR + USER_PTRS_PER_PGD) + +/* + * need to get a 4k page for level 1 + */ +pgd_t *get_pgd_slow(struct mm_struct *mm) +{ + pgd_t *new_pgd, *init_pgd; + pmd_t *new_pmd, *init_pmd; + pte_t *new_pte, *init_pte; + + new_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL, 0); + if (!new_pgd) + goto no_pgd; + + memset(new_pgd, 0, FIRST_KERNEL_PGD_NR * sizeof(pgd_t)); + + /* + * Copy over the kernel and IO PGD entries + */ + init_pgd = pgd_offset_k(0); + memcpy(new_pgd + FIRST_KERNEL_PGD_NR, init_pgd + FIRST_KERNEL_PGD_NR, + (PTRS_PER_PGD - FIRST_KERNEL_PGD_NR) * sizeof(pgd_t)); + + clean_dcache_area(new_pgd, PTRS_PER_PGD * sizeof(pgd_t)); + + if (!vectors_high()) { + /* + * On UniCore, first page must always be allocated since it + * contains the machine vectors. + */ + new_pmd = pmd_alloc(mm, (pud_t *)new_pgd, 0); + if (!new_pmd) + goto no_pmd; + + new_pte = pte_alloc_map(mm, NULL, new_pmd, 0); + if (!new_pte) + goto no_pte; + + init_pmd = pmd_offset((pud_t *)init_pgd, 0); + init_pte = pte_offset_map(init_pmd, 0); + set_pte(new_pte, *init_pte); + pte_unmap(init_pte); + pte_unmap(new_pte); + } + + return new_pgd; + +no_pte: + pmd_free(mm, new_pmd); + mm_dec_nr_pmds(mm); +no_pmd: + free_pages((unsigned long)new_pgd, 0); +no_pgd: + return NULL; +} + +void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd) +{ + pmd_t *pmd; + pgtable_t pte; + + if (!pgd) + return; + + /* pgd is always present and good */ + pmd = pmd_off(pgd, 0); + if (pmd_none(*pmd)) + goto free; + if (pmd_bad(*pmd)) { + pmd_ERROR(*pmd); + pmd_clear(pmd); + goto free; + } + + pte = pmd_pgtable(*pmd); + pmd_clear(pmd); + pte_free(mm, pte); + atomic_long_dec(&mm->nr_ptes); + pmd_free(mm, pmd); + mm_dec_nr_pmds(mm); +free: + free_pages((unsigned long) pgd, 0); +} -- cgit 1.2.3-korg