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 (1657B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2
      3#ifndef __ASM_CSKY_PGALLOC_H
      4#define __ASM_CSKY_PGALLOC_H
      5
      6#include <linux/highmem.h>
      7#include <linux/mm.h>
      8#include <linux/sched.h>
      9
     10#define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
     11#include <asm-generic/pgalloc.h>
     12
     13static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
     14					pte_t *pte)
     15{
     16	set_pmd(pmd, __pmd(__pa(pte)));
     17}
     18
     19static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
     20					pgtable_t pte)
     21{
     22	set_pmd(pmd, __pmd(__pa(page_address(pte))));
     23}
     24
     25extern void pgd_init(unsigned long *p);
     26
     27static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
     28{
     29	pte_t *pte;
     30	unsigned long i;
     31
     32	pte = (pte_t *) __get_free_page(GFP_KERNEL);
     33	if (!pte)
     34		return NULL;
     35
     36	for (i = 0; i < PAGE_SIZE/sizeof(pte_t); i++)
     37		(pte + i)->pte_low = _PAGE_GLOBAL;
     38
     39	return pte;
     40}
     41
     42static inline pgd_t *pgd_alloc(struct mm_struct *mm)
     43{
     44	pgd_t *ret;
     45	pgd_t *init;
     46
     47	ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
     48	if (ret) {
     49		init = pgd_offset(&init_mm, 0UL);
     50		pgd_init((unsigned long *)ret);
     51		memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
     52			(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
     53		/* prevent out of order excute */
     54		smp_mb();
     55#ifdef CONFIG_CPU_NEED_TLBSYNC
     56		dcache_wb_range((unsigned int)ret,
     57				(unsigned int)(ret + PTRS_PER_PGD));
     58#endif
     59	}
     60
     61	return ret;
     62}
     63
     64#define __pte_free_tlb(tlb, pte, address)		\
     65do {							\
     66	pgtable_pte_page_dtor(pte);			\
     67	tlb_remove_page(tlb, pte);			\
     68} while (0)
     69
     70extern void pagetable_init(void);
     71extern void mmu_init(unsigned long min_pfn, unsigned long max_pfn);
     72extern void pre_trap_init(void);
     73
     74#endif /* __ASM_CSKY_PGALLOC_H */