cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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pgtable.c (1336B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <linux/mm.h>
      3#include <linux/slab.h>
      4
      5static struct kmem_cache *pgd_cachep;
      6#if PAGETABLE_LEVELS > 2
      7static struct kmem_cache *pmd_cachep;
      8#endif
      9
     10void pgd_ctor(void *x)
     11{
     12	pgd_t *pgd = x;
     13
     14	memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
     15	memcpy(pgd + USER_PTRS_PER_PGD,
     16	       swapper_pg_dir + USER_PTRS_PER_PGD,
     17	       (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
     18}
     19
     20void pgtable_cache_init(void)
     21{
     22	pgd_cachep = kmem_cache_create("pgd_cache",
     23				       PTRS_PER_PGD * (1<<PTE_MAGNITUDE),
     24				       PAGE_SIZE, SLAB_PANIC, pgd_ctor);
     25#if PAGETABLE_LEVELS > 2
     26	pmd_cachep = kmem_cache_create("pmd_cache",
     27				       PTRS_PER_PMD * (1<<PTE_MAGNITUDE),
     28				       PAGE_SIZE, SLAB_PANIC, NULL);
     29#endif
     30}
     31
     32pgd_t *pgd_alloc(struct mm_struct *mm)
     33{
     34	return kmem_cache_alloc(pgd_cachep, GFP_KERNEL);
     35}
     36
     37void pgd_free(struct mm_struct *mm, pgd_t *pgd)
     38{
     39	kmem_cache_free(pgd_cachep, pgd);
     40}
     41
     42#if PAGETABLE_LEVELS > 2
     43void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
     44{
     45	set_pud(pud, __pud((unsigned long)pmd));
     46}
     47
     48pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
     49{
     50	return kmem_cache_alloc(pmd_cachep, GFP_KERNEL | __GFP_ZERO);
     51}
     52
     53void pmd_free(struct mm_struct *mm, pmd_t *pmd)
     54{
     55	kmem_cache_free(pmd_cachep, pmd);
     56}
     57#endif /* PAGETABLE_LEVELS > 2 */