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-32.c (2128B)

      1/*
      2 * This file is subject to the terms and conditions of the GNU General Public
      3 * License.  See the file "COPYING" in the main directory of this archive
      4 * for more details.
      5 *
      6 * Copyright (C) 2003 by Ralf Baechle
      7 */
      8#include <linux/init.h>
      9#include <linux/mm.h>
     10#include <linux/memblock.h>
     11#include <linux/highmem.h>
     12#include <asm/fixmap.h>
     13#include <asm/pgalloc.h>
     14#include <asm/tlbflush.h>
     15
     16void pgd_init(unsigned long page)
     17{
     18	unsigned long *p = (unsigned long *) page;
     19	int i;
     20
     21	for (i = 0; i < USER_PTRS_PER_PGD; i+=8) {
     22		p[i + 0] = (unsigned long) invalid_pte_table;
     23		p[i + 1] = (unsigned long) invalid_pte_table;
     24		p[i + 2] = (unsigned long) invalid_pte_table;
     25		p[i + 3] = (unsigned long) invalid_pte_table;
     26		p[i + 4] = (unsigned long) invalid_pte_table;
     27		p[i + 5] = (unsigned long) invalid_pte_table;
     28		p[i + 6] = (unsigned long) invalid_pte_table;
     29		p[i + 7] = (unsigned long) invalid_pte_table;
     30	}
     31}
     32
     33#if defined(CONFIG_TRANSPARENT_HUGEPAGE)
     34pmd_t mk_pmd(struct page *page, pgprot_t prot)
     35{
     36	pmd_t pmd;
     37
     38	pmd_val(pmd) = (page_to_pfn(page) << _PFN_SHIFT) | pgprot_val(prot);
     39
     40	return pmd;
     41}
     42
     43
     44void set_pmd_at(struct mm_struct *mm, unsigned long addr,
     45		pmd_t *pmdp, pmd_t pmd)
     46{
     47	*pmdp = pmd;
     48}
     49#endif /* defined(CONFIG_TRANSPARENT_HUGEPAGE) */
     50
     51void __init pagetable_init(void)
     52{
     53	unsigned long vaddr;
     54	pgd_t *pgd_base;
     55#ifdef CONFIG_HIGHMEM
     56	pgd_t *pgd;
     57	p4d_t *p4d;
     58	pud_t *pud;
     59	pmd_t *pmd;
     60	pte_t *pte;
     61#endif
     62
     63	/* Initialize the entire pgd.  */
     64	pgd_init((unsigned long)swapper_pg_dir);
     65	pgd_init((unsigned long)swapper_pg_dir
     66		 + sizeof(pgd_t) * USER_PTRS_PER_PGD);
     67
     68	pgd_base = swapper_pg_dir;
     69
     70	/*
     71	 * Fixed mappings:
     72	 */
     73	vaddr = __fix_to_virt(__end_of_fixed_addresses - 1);
     74	fixrange_init(vaddr & PMD_MASK, vaddr + FIXADDR_SIZE, pgd_base);
     75
     76#ifdef CONFIG_HIGHMEM
     77	/*
     78	 * Permanent kmaps:
     79	 */
     80	vaddr = PKMAP_BASE;
     81	fixrange_init(vaddr & PMD_MASK, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
     82
     83	pgd = swapper_pg_dir + pgd_index(vaddr);
     84	p4d = p4d_offset(pgd, vaddr);
     85	pud = pud_offset(p4d, vaddr);
     86	pmd = pmd_offset(pud, vaddr);
     87	pte = pte_offset_kernel(pmd, vaddr);
     88	pkmap_page_table = pte;
     89#endif
     90}