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author | Catalin Marinas <catalin.marinas@arm.com> | 2012-03-05 11:49:27 (GMT) |
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committer | Catalin Marinas <catalin.marinas@arm.com> | 2012-09-17 12:41:57 (GMT) |
commit | 1d18c47c735e8adfe531fc41fae31e98f86b68fe (patch) | |
tree | b63f253304e2d955e1a17d12e4f0dc94312f58ea /arch/arm64/mm/pgd.c | |
parent | c1cc1552616d0f354d040823151e61634e7ad01f (diff) | |
download | linux-fsl-qoriq-1d18c47c735e8adfe531fc41fae31e98f86b68fe.tar.xz |
arm64: MMU fault handling and page table management
This patch adds support for the handling of the MMU faults (exception
entry code introduced by a previous patch) and page table management.
The user translation table is pointed to by TTBR0 and the kernel one
(swapper_pg_dir) by TTBR1. There is no translation information shared or
address space overlapping between user and kernel page tables.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Olof Johansson <olof@lixom.net>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/arm64/mm/pgd.c')
-rw-r--r-- | arch/arm64/mm/pgd.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/arch/arm64/mm/pgd.c b/arch/arm64/mm/pgd.c new file mode 100644 index 0000000..7083cda --- /dev/null +++ b/arch/arm64/mm/pgd.c @@ -0,0 +1,54 @@ +/* + * PGD allocation/freeing + * + * Copyright (C) 2012 ARM Ltd. + * Author: Catalin Marinas <catalin.marinas@arm.com> + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/mm.h> +#include <linux/gfp.h> +#include <linux/highmem.h> +#include <linux/slab.h> + +#include <asm/pgalloc.h> +#include <asm/page.h> +#include <asm/tlbflush.h> + +#include "mm.h" + +#define PGD_SIZE (PTRS_PER_PGD * sizeof(pgd_t)) + +pgd_t *pgd_alloc(struct mm_struct *mm) +{ + pgd_t *new_pgd; + + if (PGD_SIZE == PAGE_SIZE) + new_pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL); + else + new_pgd = kzalloc(PGD_SIZE, GFP_KERNEL); + + if (!new_pgd) + return NULL; + + return new_pgd; +} + +void pgd_free(struct mm_struct *mm, pgd_t *pgd) +{ + if (PGD_SIZE == PAGE_SIZE) + free_page((unsigned long)pgd); + else + kfree(pgd); +} |