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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pgalloc.h (3373B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 *  arch/arm/include/asm/pgalloc.h
      4 *
      5 *  Copyright (C) 2000-2001 Russell King
      6 */
      7#ifndef _ASMARM_PGALLOC_H
      8#define _ASMARM_PGALLOC_H
      9
     10#include <linux/pagemap.h>
     11
     12#include <asm/domain.h>
     13#include <asm/pgtable-hwdef.h>
     14#include <asm/processor.h>
     15#include <asm/cacheflush.h>
     16#include <asm/tlbflush.h>
     17
     18#ifdef CONFIG_MMU
     19
     20#define _PAGE_USER_TABLE	(PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_USER))
     21#define _PAGE_KERNEL_TABLE	(PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_KERNEL))
     22
     23#ifdef CONFIG_ARM_LPAE
     24#define PGD_SIZE		(PTRS_PER_PGD * sizeof(pgd_t))
     25
     26static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
     27{
     28	set_pud(pud, __pud(__pa(pmd) | PMD_TYPE_TABLE));
     29}
     30
     31#else	/* !CONFIG_ARM_LPAE */
     32#define PGD_SIZE		(PAGE_SIZE << 2)
     33
     34/*
     35 * Since we have only two-level page tables, these are trivial
     36 */
     37#define pmd_alloc_one(mm,addr)		({ BUG(); ((pmd_t *)2); })
     38#define pmd_free(mm, pmd)		do { } while (0)
     39#ifdef CONFIG_KASAN
     40/* The KASan core unconditionally calls pud_populate() on all architectures */
     41#define pud_populate(mm,pmd,pte)	do { } while (0)
     42#else
     43#define pud_populate(mm,pmd,pte)	BUG()
     44#endif
     45#endif	/* CONFIG_ARM_LPAE */
     46
     47extern pgd_t *pgd_alloc(struct mm_struct *mm);
     48extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
     49
     50static inline void clean_pte_table(pte_t *pte)
     51{
     52	clean_dcache_area(pte + PTE_HWTABLE_PTRS, PTE_HWTABLE_SIZE);
     53}
     54
     55/*
     56 * Allocate one PTE table.
     57 *
     58 * This actually allocates two hardware PTE tables, but we wrap this up
     59 * into one table thus:
     60 *
     61 *  +------------+
     62 *  | Linux pt 0 |
     63 *  +------------+
     64 *  | Linux pt 1 |
     65 *  +------------+
     66 *  |  h/w pt 0  |
     67 *  +------------+
     68 *  |  h/w pt 1  |
     69 *  +------------+
     70 */
     71
     72#define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
     73#define __HAVE_ARCH_PTE_ALLOC_ONE
     74#define __HAVE_ARCH_PGD_FREE
     75#include <asm-generic/pgalloc.h>
     76
     77static inline pte_t *
     78pte_alloc_one_kernel(struct mm_struct *mm)
     79{
     80	pte_t *pte = __pte_alloc_one_kernel(mm);
     81
     82	if (pte)
     83		clean_pte_table(pte);
     84
     85	return pte;
     86}
     87
     88#ifdef CONFIG_HIGHPTE
     89#define PGTABLE_HIGHMEM __GFP_HIGHMEM
     90#else
     91#define PGTABLE_HIGHMEM 0
     92#endif
     93
     94static inline pgtable_t
     95pte_alloc_one(struct mm_struct *mm)
     96{
     97	struct page *pte;
     98
     99	pte = __pte_alloc_one(mm, GFP_PGTABLE_USER | PGTABLE_HIGHMEM);
    100	if (!pte)
    101		return NULL;
    102	if (!PageHighMem(pte))
    103		clean_pte_table(page_address(pte));
    104	return pte;
    105}
    106
    107static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte,
    108				  pmdval_t prot)
    109{
    110	pmdval_t pmdval = (pte + PTE_HWTABLE_OFF) | prot;
    111	pmdp[0] = __pmd(pmdval);
    112#ifndef CONFIG_ARM_LPAE
    113	pmdp[1] = __pmd(pmdval + 256 * sizeof(pte_t));
    114#endif
    115	flush_pmd_entry(pmdp);
    116}
    117
    118/*
    119 * Populate the pmdp entry with a pointer to the pte.  This pmd is part
    120 * of the mm address space.
    121 *
    122 * Ensure that we always set both PMD entries.
    123 */
    124static inline void
    125pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
    126{
    127	/*
    128	 * The pmd must be loaded with the physical address of the PTE table
    129	 */
    130	__pmd_populate(pmdp, __pa(ptep), _PAGE_KERNEL_TABLE);
    131}
    132
    133static inline void
    134pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
    135{
    136	extern pmdval_t user_pmd_table;
    137	pmdval_t prot;
    138
    139	if (__LINUX_ARM_ARCH__ >= 6 && !IS_ENABLED(CONFIG_ARM_LPAE))
    140		prot = user_pmd_table;
    141	else
    142		prot = _PAGE_USER_TABLE;
    143
    144	__pmd_populate(pmdp, page_to_phys(ptep), prot);
    145}
    146
    147#endif /* CONFIG_MMU */
    148
    149#endif