mirror of
https://github.com/AetherDroid/android_kernel_samsung_on5xelte.git
synced 2025-09-08 01:08:03 -04:00
109 lines
2.8 KiB
C
109 lines
2.8 KiB
C
/*
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* PGD allocation/freeing
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*
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* Copyright (C) 2012 ARM Ltd.
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* Author: Catalin Marinas <catalin.marinas@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/mm.h>
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#include <linux/gfp.h>
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#include <linux/highmem.h>
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#include <linux/slab.h>
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#include <asm/pgalloc.h>
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#include <asm/page.h>
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#include <asm/tlbflush.h>
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#include "mm.h"
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#ifdef CONFIG_TIMA_RKP
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#include <linux/rkp_entry.h>
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extern u8 rkp_started;
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#endif /* CONFIG_TIMA_RKP */
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#define PGD_SIZE (PTRS_PER_PGD * sizeof(pgd_t))
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static struct kmem_cache *pgd_cache;
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#ifndef CONFIG_TIMA_RKP
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pgd_t *pgd_alloc(struct mm_struct *mm)
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{
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if (PGD_SIZE == PAGE_SIZE)
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return (pgd_t *)get_zeroed_page(GFP_KERNEL);
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else
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return kmem_cache_zalloc(pgd_cache, GFP_KERNEL);
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}
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#else
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pgd_t *pgd_alloc(struct mm_struct *mm)
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{
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pgd_t *ret = NULL;
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#ifdef CONFIG_KNOX_KAP
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if (boot_mode_security)
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#endif
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ret = (pgd_t *) rkp_ro_alloc();
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if (!ret) {
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if (PGD_SIZE == PAGE_SIZE)
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ret = (pgd_t *)get_zeroed_page(GFP_KERNEL);
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else
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return kmem_cache_zalloc(pgd_cache, GFP_KERNEL);
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}
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#ifdef CONFIG_KNOX_KAP
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if (boot_mode_security && rkp_started)
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#endif //CONFIG_KNOX_KAP
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rkp_call(RKP_PGD_NEW, (unsigned long)ret, 0, 0, 0, 0);
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return ret;
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}
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#endif
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#ifndef CONFIG_TIMA_RKP
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void pgd_free(struct mm_struct *mm, pgd_t *pgd)
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{
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if (PGD_SIZE == PAGE_SIZE)
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free_page((unsigned long)pgd);
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else
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kmem_cache_free(pgd_cache, pgd);
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}
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#else
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void pgd_free(struct mm_struct *mm, pgd_t *pgd)
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{
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int rkp_do = 0;
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#ifdef CONFIG_KNOX_KAP
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if (boot_mode_security)
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#endif //CONFIG_KNOX_KAP
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rkp_do = 1;
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if (rkp_do) rkp_call(RKP_PGD_FREE, (unsigned long)pgd, 0, 0, 0, 0);
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/* if pgd memory come from read only buffer, the put it back */
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/*TODO: use a macro*/
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if( rkp_do && (unsigned long)pgd >= (unsigned long)RKP_RBUF_VA && (unsigned long)pgd < ((unsigned long)RKP_RBUF_VA + TIMA_ROBUF_SIZE))
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rkp_ro_free((void*)pgd);
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else
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{
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if (PGD_SIZE == PAGE_SIZE)
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free_page((unsigned long)pgd);
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else
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kmem_cache_free(pgd_cache, pgd);
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}
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}
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#endif
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static int __init pgd_cache_init(void)
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{
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/*
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* Naturally aligned pgds required by the architecture.
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*/
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if (PGD_SIZE != PAGE_SIZE)
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pgd_cache = kmem_cache_create("pgd_cache", PGD_SIZE, PGD_SIZE,
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SLAB_PANIC, NULL);
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return 0;
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}
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core_initcall(pgd_cache_init);
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