pgalloc.h

 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_alloc_one_kernel(mm);
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_alloc(mm, 0);
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)	\
65	tlb_remove_ptdesc((tlb), page_ptdesc(pte))
66
67extern void pagetable_init(void);
68extern void mmu_init(unsigned long min_pfn, unsigned long max_pfn);
69extern void pre_trap_init(void);
70
71#endif /* __ASM_CSKY_PGALLOC_H */